linking qPDF in Qt - c++

Question

I need to fill pdf form.
To do this I found and use qPDF c++ library.
I added libqpdf.dll.a on fillPdf.pro using :
win32:CONFIG(release, debug|release): LIBS += -L$$PWD/qpdf/lib/ -llibqpdf.dll
INCLUDEPATH += $$PWD/qpdf
DEPENDPATH += $$PWD/qpdf
I also added all includes .h and .hh headers from qpdf library to my project.
But I still have bugs that look like linkage problems :
.o:-1: In function `ZN8reporter8fillTestEPKcS1_S1_':
.cpp:19: erreur : undefined reference to `QPDF::QPDF()'
.cpp:20: erreur : undefined reference to `QPDF::processFile(char const*, char const*)' ^
.cpp:19: erreur : undefined reference to `QPDF::~QPDF()'
collect2.exe:-1: erreur : error: ld returned 1 exit status
summarised code all symbols are recognised by qt creator and i have access to theire classes by clicking on them :
#include <qpdf/QPDF.hh>
#include <qpdf/QPDFWriter.hh>
#include <qpdf/QUtil.hh>
#include <iostream>
int main(int argc, char* argv[])
{
char* whoami = QUtil::getWhoami(argv[0]);
if (argc != 3)
{
std::cerr << "Usage: " << whoami << " infile outfile" << std::endl;
return 2;
}
char const* infile = argv[1];
char const* outfile = argv[2];
QPDF in;
in.processFile(infile);
int pageno = 0;
std::vector<QPDFObjectHandle> const& pages = in.getAllPages();
for (std::vector<QPDFObjectHandle>::const_iterator iter = pages.begin();
iter != pages.end(); ++iter)
{
std::cout << ++pageno << " ";
QPDFObjectHandle page = *iter;
page.replaceKey(
"/Contents",
QPDFObjectHandle::newStream(&in, "q Q"));
}
QPDFWriter out(in, outfile);
out.write();
return 0;
}
More information :
QPDF WINDOWS Lib : https://sourceforge.net/projects/qpdf/files/qpdf/8.4.0/
includes : https://github.com/qpdf/qpdf/tree/master/include/qpdf
exemple : https://github.com/qpdf/qpdf/blob/master/examples/pdf-set-form-values.cc
I am using qt creator 4.4.0 based on qt 5.9.1 (MSVC 2015, 32bit)
Can someone tell me where am i wrong?
My .pro
TEMPLATE = app
CONFIG += console c++11
CONFIG -= app_bundle
CONFIG += qt
QT += core gui
QT += axcontainer
QT += serialport
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
SOURCES += main.cpp
HEADERS += \
qpdf/Buffer.hh \
qpdf/BufferInputSource.hh \
qpdf/ClosedFileInputSource.hh \
qpdf/Constants.h \
qpdf/DLL.h \
qpdf/FileInputSource.hh \
qpdf/InputSource.hh \
qpdf/JSON.hh \
qpdf/Pipeline.hh \
qpdf/Pl_Buffer.hh \
qpdf/Pl_Concatenate.hh \
qpdf/Pl_Count.hh \
qpdf/Pl_DCT.hh \
qpdf/Pl_Discard.hh \
qpdf/Pl_Flate.hh \
qpdf/Pl_QPDFTokenizer.hh \
qpdf/Pl_RunLength.hh \
qpdf/Pl_StdioFile.hh \
qpdf/PointerHolder.hh \
qpdf/qpdf-c.h \
qpdf/QPDF.hh \
qpdf/QPDFAcroFormDocumentHelper.hh \
qpdf/QPDFAnnotationObjectHelper.hh \
qpdf/QPDFDocumentHelper.hh \
qpdf/QPDFExc.hh \
qpdf/QPDFFormFieldObjectHelper.hh \
qpdf/QPDFNameTreeObjectHelper.hh \
qpdf/QPDFNumberTreeObjectHelper.hh \
qpdf/QPDFObject.hh \
qpdf/QPDFObjectHandle.hh \
qpdf/QPDFObjectHelper.hh \
qpdf/QPDFObjGen.hh \
qpdf/QPDFOutlineDocumentHelper.hh \
qpdf/QPDFOutlineObjectHelper.hh \
qpdf/QPDFPageDocumentHelper.hh \
qpdf/QPDFPageLabelDocumentHelper.hh \
qpdf/QPDFPageObjectHelper.hh \
qpdf/QPDFSystemError.hh \
qpdf/QPDFTokenizer.hh \
qpdf/QPDFWriter.hh \
qpdf/QPDFXRefEntry.hh \
qpdf/QTC.hh \
qpdf/QUtil.hh \
qpdf/RandomDataProvider.hh \
qpdf/Types.h
win32:CONFIG(release, debug|release): LIBS += -L$$PWD/qpdf/lib/ -llibqpdf.dll
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/qpdf/lib/ -llibqpdf.dllINCLUDEPATH += $$PWD/qpdf
DEPENDPATH += $$PWD/qpdf

Answer 1

I get it working using the configuration bellow :
My.pro :
#-------------------------------------------------
#
# Project created by QtCreator 2019-04-01T16:52:28
#
#-------------------------------------------------
QT += core gui
QT += axcontainer
QT += serialport
CONFIG += c++11 console
CONFIG -= app_bundle
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = QTfillpdftest
TEMPLATE = app
# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS
# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
SOURCES += \
main.cpp \
qtfillpdf.cpp
HEADERS += \
qtfillpdf.h\
qpdf/Buffer.hh \
qpdf/BufferInputSource.hh \
qpdf/ClosedFileInputSource.hh \
qpdf/Constants.h \
qpdf/DLL.h \
qpdf/FileInputSource.hh \
qpdf/InputSource.hh \
qpdf/JSON.hh \
qpdf/Pipeline.hh \
qpdf/Pl_Buffer.hh \
qpdf/Pl_Concatenate.hh \
qpdf/Pl_Count.hh \
qpdf/Pl_DCT.hh \
qpdf/Pl_Discard.hh \
qpdf/Pl_Flate.hh \
qpdf/Pl_QPDFTokenizer.hh \
qpdf/Pl_RunLength.hh \
qpdf/Pl_StdioFile.hh \
qpdf/PointerHolder.hh \
qpdf/qpdf-c.h \
qpdf/QPDF.hh \
qpdf/QPDFAcroFormDocumentHelper.hh \
qpdf/QPDFAnnotationObjectHelper.hh \
qpdf/QPDFDocumentHelper.hh \
qpdf/QPDFExc.hh \
qpdf/QPDFFormFieldObjectHelper.hh \
qpdf/QPDFNameTreeObjectHelper.hh \
qpdf/QPDFNumberTreeObjectHelper.hh \
qpdf/QPDFObject.hh \
qpdf/QPDFObjectHandle.hh \
qpdf/QPDFObjectHelper.hh \
qpdf/QPDFObjGen.hh \
qpdf/QPDFOutlineDocumentHelper.hh \
qpdf/QPDFOutlineObjectHelper.hh \
qpdf/QPDFPageDocumentHelper.hh \
qpdf/QPDFPageLabelDocumentHelper.hh \
qpdf/QPDFPageObjectHelper.hh \
qpdf/QPDFSystemError.hh \
qpdf/QPDFTokenizer.hh \
qpdf/QPDFWriter.hh \
qpdf/QPDFXRefEntry.hh \
qpdf/QTC.hh \
qpdf/QUtil.hh \
qpdf/RandomDataProvider.hh \
qpdf/Types.h
FORMS += \
qtfillpdf.ui
win32:CONFIG(release, debug|release): LIBS += -L$$PWD/qpdf/lib/ -llibqpdf.dll
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/qpdf/lib/ -llibqpdf.dll
else:unix: LIBS += -L$$PWD/qpdf/lib/ -llibqpdf.dll
INCLUDEPATH += $$PWD/qpdf
DEPENDPATH += $$PWD/qpdf
Function :
int qtfillpdf::qtfillpdfFile( char const* infilename , char const* outfilename,char const* value )
{
qDebug() << "qtfillpdf : 1 " << value;
// 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.
QPDF qpdf;
qDebug() << "qtfillpdfFile : 1.1 " << value;
qpdf.processFile(infilename);
std::string nm;
nm= qpdf.getFilename();
qDebug() << "qtfillpdf : 2 " << nm.c_str() ;
// We will iterate through form fields by starting at the page
// level and looking at each field for each page. We could
// also called 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);
QPDFPageDocumentHelper pdh(qpdf);
std::vector<QPDFPageObjectHelper> pages = pdh.getAllPages();
qDebug() << "qtfillpdf : 3 " ;
for (std::vector<QPDFPageObjectHelper>::iterator page_iter =
pages.begin();
page_iter != pages.end(); ++page_iter)
{
// Get all widget annotations for each page. Widget
// annotations are the ones that contain the details of
// what's in a form field.
std::vector<QPDFAnnotationObjectHelper> annotations =
afdh.getWidgetAnnotationsForPage(*page_iter);
for (std::vector<QPDFAnnotationObjectHelper>::iterator annot_iter = annotations.begin();
annot_iter != annotations.end(); ++annot_iter)
{
// For each annotation, find its associated field. If
// it's a text field, set its value. This will
// automatically update the document to indicate that
// appearance streams need to be regenerated. At the
// time of this writing, qpdf doesn't have any helper
// code to assist with appearance stream generation,
// though there's nothing that prevents it from being
// possible.
//qDebug() << "qtfillpdf : 4 " << annot_iter->getAppearanceState().c_str() ;
QPDFFormFieldObjectHelper ffh =
afdh.getFieldForAnnotation(*annot_iter);
if (ffh.getFieldType() == "/Tx")
{
//qDebug() << "qtfillpdf : 5 " <<ffh.getChoices().front().c_str();
// Set the value. This will automatically set
// /NeedAppearances to true. If you don't want to
// do that, pass false as the second argument. For
// details see comments in
// QPDFFormFieldObjectHelper.hh.
ffh.setV(value);
qDebug() << "OK6" << value << " ffh.getValueAsString() : " <<ffh.getValueAsString().c_str();
}
}
}
// Write out a new file
QPDFWriter w(qpdf, outfilename);
w.setStaticID(true); // for testing only
w.write();
return 3;
}
void qtfillpdf::on_Browse_clicked()
{
///TODO : mettre le liens
QString s_configFileName;
QString outfilename = "OUT.pdf";
QString value="qfiller";
s_configFileName = QFileDialog::getOpenFileName(
this,
tr("Selectfile"),
"", tr("pdf Files (*.pdf)")
);
qDebug() << "File Name : " << s_configFileName ;
qtfillpdfFile(s_configFileName.toStdString().c_str(), outfilename.toStdString().c_str(), value.toStdString().c_str());
qDebug()<< " END_BROWSE :" << s_configFileName ;
}