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);//

 }

巴特西

PDF Document Creation, Viewing

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