mirror of
https://github.com/qpdf/qpdf.git
synced 2024-12-23 03:18:59 +00:00
133 lines
3.2 KiB
C++
133 lines
3.2 KiB
C++
//
|
|
// This example illustrates the use of QPDFObjectHandle::TokenFilter
|
|
// with filterPageContents. See also pdf-filter-tokens.cc for an
|
|
// example that uses QPDFObjectHandle::TokenFilter with
|
|
// addContentTokenFilter.
|
|
//
|
|
|
|
#include <iostream>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
|
|
#include <qpdf/QPDF.hh>
|
|
#include <qpdf/QPDFPageDocumentHelper.hh>
|
|
#include <qpdf/QPDFPageObjectHelper.hh>
|
|
#include <qpdf/QUtil.hh>
|
|
#include <qpdf/QPDFObjectHandle.hh>
|
|
#include <qpdf/Pl_StdioFile.hh>
|
|
|
|
static char const* whoami = 0;
|
|
|
|
void usage()
|
|
{
|
|
std::cerr << "Usage: " << whoami << " infile" << std::endl
|
|
<< "Applies token filters to infile"
|
|
<< std::endl;
|
|
exit(2);
|
|
}
|
|
|
|
class StringCounter: public QPDFObjectHandle::TokenFilter
|
|
{
|
|
public:
|
|
StringCounter() :
|
|
count(0)
|
|
{
|
|
}
|
|
virtual ~StringCounter()
|
|
{
|
|
}
|
|
virtual void handleToken(QPDFTokenizer::Token const&);
|
|
virtual void handleEOF();
|
|
int getCount() const;
|
|
|
|
private:
|
|
int count;
|
|
};
|
|
|
|
void
|
|
StringCounter::handleToken(QPDFTokenizer::Token const& token)
|
|
{
|
|
// Count string tokens
|
|
if (token.getType() == QPDFTokenizer::tt_string)
|
|
{
|
|
++this->count;
|
|
}
|
|
// Preserve input verbatim by passing each token to any specified
|
|
// downstream filter.
|
|
writeToken(token);
|
|
}
|
|
|
|
void
|
|
StringCounter::handleEOF()
|
|
{
|
|
// Write a comment at the end of the stream just to show how we
|
|
// can enhance the output if we want.
|
|
write("\n% strings found: ");
|
|
write(QUtil::int_to_string(this->count));
|
|
}
|
|
|
|
int
|
|
StringCounter::getCount() const
|
|
{
|
|
return this->count;
|
|
}
|
|
|
|
int main(int argc, char* argv[])
|
|
{
|
|
whoami = QUtil::getWhoami(argv[0]);
|
|
|
|
// For libtool's sake....
|
|
if (strncmp(whoami, "lt-", 3) == 0)
|
|
{
|
|
whoami += 3;
|
|
}
|
|
|
|
if (argc != 2)
|
|
{
|
|
usage();
|
|
}
|
|
char const* infilename = argv[1];
|
|
|
|
try
|
|
{
|
|
QPDF pdf;
|
|
pdf.processFile(infilename);
|
|
std::vector<QPDFPageObjectHelper> pages =
|
|
QPDFPageDocumentHelper(pdf).getAllPages();
|
|
int pageno = 0;
|
|
for (std::vector<QPDFPageObjectHelper>::iterator iter = pages.begin();
|
|
iter != pages.end(); ++iter)
|
|
{
|
|
QPDFPageObjectHelper& ph(*iter);
|
|
++pageno;
|
|
// Pass the contents of a page through our string counter.
|
|
// If it's an even page, capture the output. This
|
|
// illustrates that you may capture any output generated
|
|
// by the filter, or you may ignore it.
|
|
StringCounter counter;
|
|
if (pageno % 2)
|
|
{
|
|
// Ignore output for odd pages.
|
|
ph.filterPageContents(&counter);
|
|
}
|
|
else
|
|
{
|
|
// Write output to stdout for even pages.
|
|
Pl_StdioFile out("stdout", stdout);
|
|
std::cout << "% Contents of page " << pageno << std::endl;
|
|
ph.filterPageContents(&counter, &out);
|
|
std::cout << "\n% end " << pageno << std::endl;
|
|
}
|
|
std::cout << "Page " << pageno
|
|
<< ": strings = " << counter.getCount() << std::endl;
|
|
}
|
|
}
|
|
catch (std::exception& e)
|
|
{
|
|
std::cerr << whoami << ": " << e.what() << std::endl;
|
|
exit(2);
|
|
}
|
|
|
|
return 0;
|
|
}
|