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Add examples to documentation (Issue #69)
This commit is contained in:
Michael R Sweet
parent
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commit
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123
doc/pdfio.3
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doc/pdfio.3
@ -1,4 +1,4 @@
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.TH pdfio 3 "pdf read/write library" "2024-06-24" "pdf read/write library"
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.TH pdfio 3 "pdf read/write library" "2024-08-05" "pdf read/write library"
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.SH NAME
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.SH NAME
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pdfio \- pdf read/write library
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pdfio \- pdf read/write library
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.SH Introduction
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.SH Introduction
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@ -361,7 +361,7 @@ pdfioStreamWrite writes a buffer of data to the stream
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.PP
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.PP
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The PDF content helper functions provide additional functions for writing specific PDF page stream commands.
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The PDF content helper functions provide additional functions for writing specific PDF page stream commands.
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.PP
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.PP
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When you are done writing the stream, call pdfioStreamCLose to close both the stream and the object.
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When you are done writing the stream, call pdfioStreamClose to close both the stream and the object.
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.SS PDF Content Helper Functions
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.SS PDF Content Helper Functions
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.PP
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.PP
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PDFio includes many helper functions for embedding or writing specific kinds of content to a PDF file. These functions can be roughly grouped into five categories:
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PDFio includes many helper functions for embedding or writing specific kinds of content to a PDF file. These functions can be roughly grouped into five categories:
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@ -787,6 +787,125 @@ pdfioContentTextShowf draws a formatted string in a text block
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pdfioContentTextShowJustified draws an array of literal strings with offsets between them
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pdfioContentTextShowJustified draws an array of literal strings with offsets between them
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.SH Examples
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.SS Read PDF Metadata
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.PP
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The following example function will open a PDF file and print the title, author, creation date, and number of pages:
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.nf
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#include <pdfio.h>
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#include <time.h>
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void
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show_pdf_info(const char *filename)
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{
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pdfio_file_t *pdf;
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time_t creation_date;
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struct tm *creation_tm;
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char creation_text[256];
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// Open the PDF file with the default callbacks...
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pdf = pdfioFileOpen(filename, /*password_cb*/NULL, /*password_cbdata*/NULL, /*error_cb*/NULL, /*error_cbdata*/NULL);
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if (pdf == NULL)
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return;
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// Get the creation date and convert to a string...
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creation_date = pdfioFileGetCreationDate(pdf);
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creation_tm = localtime(&creation_date);
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strftime(creation_text, sizeof(creation_text), "%c", &creation_tm);
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// Print file information to stdout...
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printf("%s:\\n", filename);
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printf(" Title: %s\\n", pdfioFileGetTitle(pdf));
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printf(" Author: %s\\n", pdfioFileGetAuthor(pdf));
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printf(" Created On: %s\\n", creation_text);
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printf(" Number Pages: %u\\n", (unsigned)pdfioFileGetNumPages(pdf));
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// Close the PDF file...
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pdfioFileClose(pdf);
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}
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.fi
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.SS Create PDF File With Text and Image
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.PP
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The following example function will create a PDF file, embed a base font and the named JPEG or PNG image file, and then creates a page with the image centered on the page with the text centered below:
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.nf
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#include <pdfio.h>
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#include <pdfio\-content.h>
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#include <string.h>
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void
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create_pdf_image_file(const char *pdfname, const char *imagename, const char *caption)
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{
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pdfio_file_t *pdf;
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pdfio_obj_t *font;
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pdfio_obj_t *image;
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pdfio_dict_t *dict;
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pdfio_stream_t *page;
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double width, height;
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double swidth, sheight;
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double tx, ty;
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// Create the PDF file...
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pdf = pdfioFileCreate(pdfname, /*version*/NULL, /*media_box*/NULL, /*crop_box*/NULL, /*error_cb*/NULL, /*error_cbdata*/NULL);
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// Create a Courier base font for the caption
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font = pdfioFileCreateFontObjFromBase(pdf, "Courier");
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// Create an image object from the JPEG/PNG image file...
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image = pdfioFileCreateImageObjFromFile(pdf, imagename, true);
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// Create a page dictionary with the font and image...
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dict = pdfioDictCreate(pdf);
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pdfioPageDictAddFont(dict, "F1", font);
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pdfioPageDictAddImage(dict, "IM1", image);
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// Create the page and its content stream...
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page = pdfioFileCreatePage(pdf, dict);
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// Position and scale the image on the page...
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width = pdfioImageGetWidth(image);
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height = pdfioImageGetHeight(image);
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// Default media_box is "universal" 595.28x792 points (8.27x11in or 210x279mm)
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// Use margins of 36 points (0.5in or 12.7mm) with another 36 points for the
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// caption underneath...
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swidth = 595.28 \- 72.0;
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sheight = swidth * height / width;
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if (sheight > (792.0 \- 36.0 \- 72.0))
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{
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sheight = 792.0 \- 36.0 \- 72.0;
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swidth = sheight * width / height;
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}
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tx = 0.5 * (595.28 \- swidth);
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ty = 0.5 * (792 \- 36 \- sheight);
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pdfioContentDrawImage(page, "IM1", tx, ty + 36.0, swidth, sheight);
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// Draw the caption in black...
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pdfioContentSetFillColorDeviceGray(page, 0.0);
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// Compute the starting point for the text \- Courier is monospaced with a
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// nominal width of 0.6 times the text height...
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tx = 0.5 * (595.28 \- 18.0 * 0.6 * strlen(caption));
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// Position and draw the caption underneath...
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pdfioContentTextBegin(page);
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pdfioContentSetTextFont(page, "F1", 18.0);
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pdfioContentTextMoveTo(page, tx, ty);
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pdfioContentTextShow(page, /*unicode*/false, caption);
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pdfioContentTextEnd(page);
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// Close the page stream and the PDF file...
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pdfioStreamClose(page);
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pdfioFileClose(pdf);
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}
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.fi
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.SH ENUMERATIONS
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.SH ENUMERATIONS
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.SS pdfio_cs_e
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.SS pdfio_cs_e
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121
doc/pdfio.html
121
doc/pdfio.html
@ -273,6 +273,10 @@ span.string {
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<li><a href="#pdf-streams">PDF Streams</a></li>
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<li><a href="#pdf-streams">PDF Streams</a></li>
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<li><a href="#pdf-content-helper-functions">PDF Content Helper Functions</a></li>
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<li><a href="#pdf-content-helper-functions">PDF Content Helper Functions</a></li>
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</ul></li>
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</ul></li>
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<li><a href="#examples">Examples</a><ul class="subcontents">
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<li><a href="#read-pdf-metadata">Read PDF Metadata</a></li>
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<li><a href="#create-pdf-file-with-text-and-image">Create PDF File With Text and Image</a></li>
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</ul></li>
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<li><a href="#FUNCTIONS">Functions</a><ul class="subcontents">
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<li><a href="#FUNCTIONS">Functions</a><ul class="subcontents">
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<li><a href="#pdfioArrayAppendArray">pdfioArrayAppendArray</a></li>
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<li><a href="#pdfioArrayAppendArray">pdfioArrayAppendArray</a></li>
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<li><a href="#pdfioArrayAppendBinary">pdfioArrayAppendBinary</a></li>
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<li><a href="#pdfioArrayAppendBinary">pdfioArrayAppendBinary</a></li>
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@ -709,7 +713,7 @@ pdfio_stream_t *st = pdfioFileCreatePage(pdf, dict);
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</li>
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</li>
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</ul>
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</ul>
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<p>The <a href="#pdf-content-helper-functions">PDF content helper functions</a> provide additional functions for writing specific PDF page stream commands.</p>
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<p>The <a href="#pdf-content-helper-functions">PDF content helper functions</a> provide additional functions for writing specific PDF page stream commands.</p>
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<p>When you are done writing the stream, call <a href="#pdfioStreamCLose"><code>pdfioStreamCLose</code></a> to close both the stream and the object.</p>
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<p>When you are done writing the stream, call <a href="#pdfioStreamClose"><code>pdfioStreamClose</code></a> to close both the stream and the object.</p>
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<h3 class="title" id="pdf-content-helper-functions">PDF Content Helper Functions</h3>
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<h3 class="title" id="pdf-content-helper-functions">PDF Content Helper Functions</h3>
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<p>PDFio includes many helper functions for embedding or writing specific kinds of content to a PDF file. These functions can be roughly grouped into five categories:</p>
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<p>PDFio includes many helper functions for embedding or writing specific kinds of content to a PDF file. These functions can be roughly grouped into five categories:</p>
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<ul>
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<ul>
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@ -943,6 +947,119 @@ pdfio_obj_t *img = pdfioFileCreateImageObjFromFile(pdf, <span class="string">&qu
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<li><p><a href="#pdfioContentTextShowJustified"><code>pdfioContentTextShowJustified</code></a> draws an array of literal strings with offsets between them</p>
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<li><p><a href="#pdfioContentTextShowJustified"><code>pdfioContentTextShowJustified</code></a> draws an array of literal strings with offsets between them</p>
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</li>
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</li>
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</ul>
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</ul>
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<h2 class="title" id="examples">Examples</h2>
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<h3 class="title" id="read-pdf-metadata">Read PDF Metadata</h3>
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<p>The following example function will open a PDF file and print the title, author, creation date, and number of pages:</p>
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<pre><code class="language-c"><span class="directive">#include <pdfio.h></span>
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<span class="directive">#include <time.h></span>
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<span class="reserved">void</span>
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show_pdf_info(<span class="reserved">const</span> <span class="reserved">char</span> *filename)
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{
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pdfio_file_t *pdf;
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time_t creation_date;
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<span class="reserved">struct</span> tm *creation_tm;
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<span class="reserved">char</span> creation_text[<span class="number">256</span>];
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<span class="comment">// Open the PDF file with the default callbacks...</span>
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pdf = pdfioFileOpen(filename, <span class="comment">/*password_cb*/</span>NULL, <span class="comment">/*password_cbdata*/</span>NULL, <span class="comment">/*error_cb*/</span>NULL, <span class="comment">/*error_cbdata*/</span>NULL);
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<span class="reserved">if</span> (pdf == NULL)
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<span class="reserved">return</span>;
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<span class="comment">// Get the creation date and convert to a string...</span>
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creation_date = pdfioFileGetCreationDate(pdf);
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creation_tm = localtime(&creation_date);
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strftime(creation_text, <span class="reserved">sizeof</span>(creation_text), <span class="string">"%c"</span>, &creation_tm);
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<span class="comment">// Print file information to stdout...</span>
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printf(<span class="string">"%s:\n"</span>, filename);
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printf(<span class="string">" Title: %s\n"</span>, pdfioFileGetTitle(pdf));
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printf(<span class="string">" Author: %s\n"</span>, pdfioFileGetAuthor(pdf));
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printf(<span class="string">" Created On: %s\n"</span>, creation_text);
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printf(<span class="string">" Number Pages: %u\n"</span>, (<span class="reserved">unsigned</span>)pdfioFileGetNumPages(pdf));
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<span class="comment">// Close the PDF file...</span>
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pdfioFileClose(pdf);
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}
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</code></pre>
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<h3 class="title" id="create-pdf-file-with-text-and-image">Create PDF File With Text and Image</h3>
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<p>The following example function will create a PDF file, embed a base font and the named JPEG or PNG image file, and then creates a page with the image centered on the page with the text centered below:</p>
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<pre><code class="language-c"><span class="directive">#include <pdfio.h></span>
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<span class="directive">#include <pdfio-content.h></span>
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<span class="directive">#include <string.h></span>
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<span class="reserved">void</span>
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create_pdf_image_file(<span class="reserved">const</span> <span class="reserved">char</span> *pdfname, <span class="reserved">const</span> <span class="reserved">char</span> *imagename, <span class="reserved">const</span> <span class="reserved">char</span> *caption)
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{
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pdfio_file_t *pdf;
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pdfio_obj_t *font;
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pdfio_obj_t *image;
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pdfio_dict_t *dict;
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pdfio_stream_t *page;
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<span class="reserved">double</span> width, height;
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<span class="reserved">double</span> swidth, sheight;
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<span class="reserved">double</span> tx, ty;
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<span class="comment">// Create the PDF file...</span>
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pdf = pdfioFileCreate(pdfname, <span class="comment">/*version*/</span>NULL, <span class="comment">/*media_box*/</span>NULL, <span class="comment">/*crop_box*/</span>NULL, <span class="comment">/*error_cb*/</span>NULL, <span class="comment">/*error_cbdata*/</span>NULL);
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<span class="comment">// Create a Courier base font for the caption</span>
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font = pdfioFileCreateFontObjFromBase(pdf, <span class="string">"Courier"</span>);
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<span class="comment">// Create an image object from the JPEG/PNG image file...</span>
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image = pdfioFileCreateImageObjFromFile(pdf, imagename, <span class="reserved">true</span>);
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<span class="comment">// Create a page dictionary with the font and image...</span>
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dict = pdfioDictCreate(pdf);
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pdfioPageDictAddFont(dict, <span class="string">"F1"</span>, font);
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pdfioPageDictAddImage(dict, <span class="string">"IM1"</span>, image);
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<span class="comment">// Create the page and its content stream...</span>
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page = pdfioFileCreatePage(pdf, dict);
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<span class="comment">// Position and scale the image on the page...</span>
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width = pdfioImageGetWidth(image);
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height = pdfioImageGetHeight(image);
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<span class="comment">// Default media_box is "universal" 595.28x792 points (8.27x11in or 210x279mm)</span>
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<span class="comment">// Use margins of 36 points (0.5in or 12.7mm) with another 36 points for the</span>
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<span class="comment">// caption underneath...</span>
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swidth = <span class="number">595.28</span> - <span class="number">72.0</span>;
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sheight = swidth * height / width;
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<span class="reserved">if</span> (sheight > (<span class="number">792.0</span> - <span class="number">36.0</span> - <span class="number">72.0</span>))
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{
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sheight = <span class="number">792.0</span> - <span class="number">36.0</span> - <span class="number">72.0</span>;
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swidth = sheight * width / height;
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}
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tx = <span class="number">0.5</span> * (<span class="number">595.28</span> - swidth);
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ty = <span class="number">0.5</span> * (<span class="number">792</span> - <span class="number">36</span> - sheight);
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pdfioContentDrawImage(page, <span class="string">"IM1"</span>, tx, ty + <span class="number">36.0</span>, swidth, sheight);
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<span class="comment">// Draw the caption in black...</span>
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pdfioContentSetFillColorDeviceGray(page, <span class="number">0.0</span>);
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<span class="comment">// Compute the starting point for the text - Courier is monospaced with a</span>
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<span class="comment">// nominal width of 0.6 times the text height...</span>
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tx = <span class="number">0.5</span> * (<span class="number">595.28</span> - <span class="number">18.0</span> * <span class="number">0.6</span> * strlen(caption));
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<span class="comment">// Position and draw the caption underneath...</span>
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pdfioContentTextBegin(page);
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pdfioContentSetTextFont(page, <span class="string">"F1"</span>, <span class="number">18.0</span>);
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pdfioContentTextMoveTo(page, tx, ty);
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pdfioContentTextShow(page, <span class="comment">/*unicode*/</span><span class="reserved">false</span>, caption);
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pdfioContentTextEnd(page);
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<span class="comment">// Close the page stream and the PDF file...</span>
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pdfioStreamClose(page);
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pdfioFileClose(pdf);
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}
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</code></pre>
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<h2 class="title"><a id="FUNCTIONS">Functions</a></h2>
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<h2 class="title"><a id="FUNCTIONS">Functions</a></h2>
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<h3 class="function"><a id="pdfioArrayAppendArray">pdfioArrayAppendArray</a></h3>
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<h3 class="function"><a id="pdfioArrayAppendArray">pdfioArrayAppendArray</a></h3>
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<p class="description">Add an array value to an array.</p>
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<p class="description">Add an array value to an array.</p>
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@ -3447,7 +3564,7 @@ array that was created using the
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<tr><th>dict</th>
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<tr><th>dict</th>
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<td class="description">Page dictionary</td></tr>
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<td class="description">Page dictionary</td></tr>
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<tr><th>name</th>
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<tr><th>name</th>
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<td class="description">Font name</td></tr>
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<td class="description">Font name; must not contain spaces</td></tr>
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<tr><th>obj</th>
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<tr><th>obj</th>
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<td class="description">Font object</td></tr>
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<td class="description">Font object</td></tr>
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</tbody></table>
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</tbody></table>
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130
doc/pdfio.md
130
doc/pdfio.md
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- [`pdfioContentTextShowf`](@@) draws a formatted string in a text block
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- [`pdfioContentTextShowf`](@@) draws a formatted string in a text block
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- [`pdfioContentTextShowJustified`](@@) draws an array of literal strings with
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- [`pdfioContentTextShowJustified`](@@) draws an array of literal strings with
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offsets between them
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offsets between them
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Examples
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========
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Read PDF Metadata
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-----------------
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The following example function will open a PDF file and print the title, author,
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creation date, and number of pages:
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```c
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#include <pdfio.h>
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#include <time.h>
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void
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show_pdf_info(const char *filename)
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{
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pdfio_file_t *pdf;
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time_t creation_date;
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struct tm *creation_tm;
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char creation_text[256];
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// Open the PDF file with the default callbacks...
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pdf = pdfioFileOpen(filename, /*password_cb*/NULL, /*password_cbdata*/NULL, /*error_cb*/NULL, /*error_cbdata*/NULL);
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if (pdf == NULL)
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return;
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// Get the creation date and convert to a string...
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creation_date = pdfioFileGetCreationDate(pdf);
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creation_tm = localtime(&creation_date);
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strftime(creation_text, sizeof(creation_text), "%c", &creation_tm);
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// Print file information to stdout...
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printf("%s:\n", filename);
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printf(" Title: %s\n", pdfioFileGetTitle(pdf));
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printf(" Author: %s\n", pdfioFileGetAuthor(pdf));
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printf(" Created On: %s\n", creation_text);
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printf(" Number Pages: %u\n", (unsigned)pdfioFileGetNumPages(pdf));
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// Close the PDF file...
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pdfioFileClose(pdf);
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}
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```
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Create PDF File With Text and Image
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-----------------------------------
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The following example function will create a PDF file, embed a base font and the
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named JPEG or PNG image file, and then creates a page with the image centered on
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the page with the text centered below:
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```c
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#include <pdfio.h>
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#include <pdfio-content.h>
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#include <string.h>
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void
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create_pdf_image_file(const char *pdfname, const char *imagename, const char *caption)
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{
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pdfio_file_t *pdf;
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pdfio_obj_t *font;
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pdfio_obj_t *image;
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pdfio_dict_t *dict;
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pdfio_stream_t *page;
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double width, height;
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double swidth, sheight;
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double tx, ty;
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// Create the PDF file...
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pdf = pdfioFileCreate(pdfname, /*version*/NULL, /*media_box*/NULL, /*crop_box*/NULL, /*error_cb*/NULL, /*error_cbdata*/NULL);
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// Create a Courier base font for the caption
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font = pdfioFileCreateFontObjFromBase(pdf, "Courier");
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// Create an image object from the JPEG/PNG image file...
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image = pdfioFileCreateImageObjFromFile(pdf, imagename, true);
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// Create a page dictionary with the font and image...
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dict = pdfioDictCreate(pdf);
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pdfioPageDictAddFont(dict, "F1", font);
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pdfioPageDictAddImage(dict, "IM1", image);
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// Create the page and its content stream...
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page = pdfioFileCreatePage(pdf, dict);
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// Position and scale the image on the page...
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width = pdfioImageGetWidth(image);
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height = pdfioImageGetHeight(image);
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// Default media_box is "universal" 595.28x792 points (8.27x11in or 210x279mm)
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// Use margins of 36 points (0.5in or 12.7mm) with another 36 points for the
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// caption underneath...
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swidth = 595.28 - 72.0;
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sheight = swidth * height / width;
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if (sheight > (792.0 - 36.0 - 72.0))
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{
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sheight = 792.0 - 36.0 - 72.0;
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swidth = sheight * width / height;
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}
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tx = 0.5 * (595.28 - swidth);
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ty = 0.5 * (792 - 36 - sheight);
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pdfioContentDrawImage(page, "IM1", tx, ty + 36.0, swidth, sheight);
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// Draw the caption in black...
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pdfioContentSetFillColorDeviceGray(page, 0.0);
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// Compute the starting point for the text - Courier is monospaced with a
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// nominal width of 0.6 times the text height...
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tx = 0.5 * (595.28 - 18.0 * 0.6 * strlen(caption));
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// Position and draw the caption underneath...
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pdfioContentTextBegin(page);
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pdfioContentSetTextFont(page, "F1", 18.0);
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pdfioContentTextMoveTo(page, tx, ty);
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pdfioContentTextShow(page, /*unicode*/false, caption);
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pdfioContentTextEnd(page);
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// Close the page stream and the PDF file...
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pdfioStreamClose(page);
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pdfioFileClose(pdf);
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}
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```
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