PDF Document Creation, Viewing

【PDF Document Creation, Viewing, and Transforming】

　　Quartz provides the data type CGPDFDocumentRef to represent a PDF document. You create a CGPDFDocument object using either the function CGPDFDocumentCreateWithProvider or the function CGPDFDocumentCreateWithURL. After you create a CGPDFDocument object, you can draw it to a graphics context.

　　Following code shows how to create a CGPDFDocument object and obtain the number of pages in the document. by

CGPDFDocumentGetNumberOfPages function. A detailed explanation for each numbered line of code appears following the listing.

 CGPDFDocumentRef MyGetPDFDocumentRef (const char *filename)
 {
     CFStringRef path;
     CFURLRef url;
     CGPDFDocumentRef document;
     size_t count;

     path = CFStringCreateWithCString (NULL, filename,
                          kCFStringEncodingUTF8);
     url = CFURLCreateWithFileSystemPath (NULL, path, //
                         kCFURLPOSIXPathStyle, );
     CFRelease (path);
     document = CGPDFDocumentCreateWithURL (url);//
     CFRelease(url);
     count = CGPDFDocumentGetNumberOfPages (document);//
     if (count == ) {
         printf("`%s' needs at least one page!", filename);
         return NULL;
     }
     return document;
 }

　　Drawing a PDF page:

 void MyDisplayPDFPage (CGContextRef myContext,
                     size_t pageNumber,
                     const char *filename)
 {
     CGPDFDocumentRef document;
     CGPDFPageRef page;

     document = MyGetPDFDocumentRef (filename);//
     page = CGPDFDocumentGetPage (document, pageNumber);//
     CGContextDrawPDFPage (myContext, page);//
     CGPDFDocumentRelease (document);//
 }