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