使用 Poppler-Qt4 加载并显示 PDF 文档

Question

1. #include <poppler-qt4.h>
3. //A PDF document can then be loaded as follows:
4. QString filename;
6. Poppler::Document* document = Poppler::Document::load(filename);
7. if (!document || document->isLocked()) {
9.   // ... error message ....
11.   delete document;
12.   return;
13. }
15. // Paranoid safety check
16. if (document == 0) {
17.   // ... error message ...
18.   return;
19. }
21. // Access page of the PDF file
22. Poppler::Page* pdfPage = document->page(pageNumber);  // Document starts at page 0
23. if (pdfPage == 0) {
24.   // ... error message ...
25.   return;
26. }
28. // Pages can be rendered to QImages with the following commands:
29. // Generate a QImage of the rendered page
30. QImage image = pdfPage->renderToImage(xres, yres, x, y, width, height);
31. if (image.isNull()) {
32.   // ... error message ...
33.   return;
34. }
36. // ... use image ...
38. // after the usage, the page must be deleted
39. delete pdfPage;
41. // Finally, don't forget to destroy the document:
42. delete document;

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