How do I use the COM components (XpdfPrint, XpdfRasterizer, XpdfText, etc.) in Visual C++?
Applies to: XpdfPrint, XpdfRasterizer, XpdfText, XpdfAnalyze, XpdfImageExtract, XpdfInfo, XpdfPS
Most of the example code for Glyph & Cog's COM components is in Visual Basic, but using them from C++ is just as easy.
The key thing is to use the #import directive with the no_namespace flag. For example, to call XpdfPrint from C++, the code would look like this:
#import "XpdfPrint.dll" no_namespace
int main(int argc, char *argv[]) {
// this needs to be called, usually somewhere near the beginning
// of your program
CoInitialize(NULL);
...
printSomething();
...
}
void printSomething() {
IXpdfPrintPtr pdf;
HRESULT hr;
if (FAILED(hr = pdf.CreateInstance(__uuidof(XpdfPrint)))) {
printf("Failed to create XpdfPrint object: %08x\n", hr);
return;
}
if (FAILED(pdf->loadFile("c:\\file.pdf"))) {
printf("loadFile() failed\n");
return;
}
if (FAILED(pdf->printPDF3(pdf->GetprintSetPrinterFlag(),
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
"printer17", 0, 0))) {
printf("printPDF3() failed\n");
return;
}
}
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Similar code can be used with the other COM components.
Note that VC++ uses Get and Set functions to access COM properties. In the example code above, GetprintSetPrinterFlag() is used to read the printSetPrinterFlag property.