使用 Poppler-Qt4 加载并显示 PDF 文档

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1. #include <poppler-qt4.h>
   
2. 
   
3. //A PDF document can then be loaded as follows:
   
4. QString filename;
   
5. 
   
6. Poppler::Document* document = Poppler::Document::load(filename);
   
7. if (!document || document->isLocked()) {
   
8. 
   
9.   // ... error message ....
   
10. 
    
11.   delete document;
    
12.   return;
    
13. }
    
14. 
    
15. // Paranoid safety check
    
16. if (document == 0) {
    
17.   // ... error message ...
    
18.   return;
    
19. }
    
20. 
    
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. }
    
27. 
    
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. }
    
35. 
    
36. // ... use image ...
    
37. 
    
38. // after the usage, the page must be deleted
    
39. delete pdfPage;
    
40. 
    
41. // Finally, don't forget to destroy the document:
    
42. delete document;

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