QPDF test code

replace-test.mm

#include <CoreFoundation/CFString.h>
#include <qpdf/QPDF.hh>
#include <qpdf/QPDFObjectHandle.hh>
#include <qpdf/QPDFWriter.hh>
#include <Foundation/NSObjcRuntime.h>
#include <string>

int main (int argc, char* argv[])
{

	QPDF qdoc;
	qdoc.emptyPDF();

	QPDFObjectHandle qObject = QPDFObjectHandle::parse("<< /test 2 /Count 0 /Kids [ ] /Type /Pages >>");

	std::cout << qObject.unparse() << std::endl;  // Correctly outputs the replacement object

	QPDFObjectHandle old = qdoc.getObjectByID(2,0);
        std::cout << old.unparse() << std::endl;
        std::cout << old.unparseResolved() << std::endl;


	QPDFWriter qpdfWriter(qdoc);
   // qpdfWriter.setOutputFilename("before.pdf");  // this wrote correctly.
	qpdfWriter.setOutputMemory();
	qpdfWriter.write();
	
	Buffer* qBuf = qpdfWriter.getBuffer();
	unsigned char const* qBytes = qBuf->getBuffer();

	CFStringRef cs = CFStringCreateWithBytes(NULL, qBytes, qBuf->getSize(), 0, false);  

	NSLog(@"%@",(NSString*)cs); // Outputs the PDF correctly

    delete(qBuf);
    
	qdoc.replaceObject(2,0,qObject);

    qdoc.updateAllPagesCache();  // I thought this might help

	QPDFObjectHandle newo = qdoc.getObjectByID(2,0);
        std::cout << newo.unparse() << std::endl;  // returns the correct indirect object "2 0 R"
        std::cout << newo.unparseResolved() << std::endl; // returns the correctly replaced object

	QPDFWriter qpdf2Writer(qdoc);
//    qpdfWriter.setOutputFilename("after.pdf");  // This crashed, when I changed the code to write to files

	qpdf2Writer.setOutputMemory();
	qpdf2Writer.write();
	
	Buffer* q2Buf = qpdf2Writer.getBuffer();
	unsigned char const* q2Bytes = q2Buf->getBuffer();

	CFStringRef c2s = CFStringCreateWithBytes(NULL, q2Bytes, q2Buf->getSize(), 0, false);

	NSLog(@"%@",(NSString*)c2s);  // returns the original (before replacement) PDF
    
	return 0;
}

Line 46 (commented out) crashes because it should say qpdf2Writer instead of qpdfWriter.