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85 lines
3.0 KiB
C++
85 lines
3.0 KiB
C++
#include <qpdf/QPDF.hh>
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#include <qpdf/QPDFAcroFormDocumentHelper.hh>
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#include <qpdf/QPDFPageDocumentHelper.hh>
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#include <qpdf/QPDFWriter.hh>
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#include <qpdf/QUtil.hh>
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#include <cstdlib>
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#include <iostream>
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static char const* whoami = nullptr;
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void
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usage()
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{
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std::cerr << "Usage: " << whoami << " infile.pdf outfile.pdf value" << std::endl
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<< "Set the value of all text fields to a specified value" << std::endl;
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exit(2);
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}
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int
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main(int argc, char* argv[])
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{
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whoami = QUtil::getWhoami(argv[0]);
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if (argc != 4) {
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usage();
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}
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char const* infilename = argv[1];
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char const* outfilename = argv[2];
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char const* value = argv[3];
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// This is a contrived example that just goes through a file page
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// by page and sets the value of any text fields it finds to a
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// fixed value as given on the command line. The purpose here is
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// to illustrate use of the helper classes around interactive
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// forms.
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try {
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QPDF qpdf;
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qpdf.processFile(infilename);
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// We will iterate through form fields by starting at the page
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// level and looking at each field for each page. We could
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// also called QPDFAcroFormDocumentHelper::getFormFields to
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// iterate at the field level, but doing it as below
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// illustrates how we can map from annotations to fields.
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QPDFAcroFormDocumentHelper afdh(qpdf);
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for (auto const& page: QPDFPageDocumentHelper(qpdf).getAllPages()) {
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// Get all widget annotations for each page. Widget
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// annotations are the ones that contain the details of
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// what's in a form field.
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for (auto& annot: afdh.getWidgetAnnotationsForPage(page)) {
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// For each annotation, find its associated field. If
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// it's a text field, set its value.
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QPDFFormFieldObjectHelper ffh = afdh.getFieldForAnnotation(annot);
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if (ffh.getFieldType() == "/Tx") {
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// Set the value. Passing false as the second
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// value prevents qpdf from setting
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// /NeedAppearances to true (but will not turn it
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// off if it's already on), so we call
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// generateAppearance after setting the value. You
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// may or may not want to do this depending on
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// whether the appearance streams generated by
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// qpdf are good enough for your purposes. For
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// additional details, please see comments in
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// QPDFFormFieldObjectHelper.hh for this method.
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ffh.setV(value, false);
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ffh.generateAppearance(annot);
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}
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}
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}
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// Write out a new file
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QPDFWriter w(qpdf, outfilename);
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w.setStaticID(true); // for testing only
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w.write();
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} catch (std::exception& e) {
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std::cerr << whoami << " processing file " << infilename << ": " << e.what() << std::endl;
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exit(2);
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}
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return 0;
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}
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