從Quartz中解析PDF格式的多媒體

Question

我一直在試圖解析引用PDF文件上的文件的屏幕註釋，我無法以某種方式獲得對流的控制權。應該在那裏的東西，如EmbeddedFiles數組或Dests字典不在那裏。爲了避免Flash視頻的強制轉換，我使用adobe acrobat pro 9生成了PDF，兼容閱讀器6或更高版本。

this is the test pdf I'm using.

代碼剪斷解析這個壞小子就是這個

2011-02-05 01:59:35.324 xxxxxxxxxx[62350:207] -> parseLink annotation subtype Screen 
2011-02-05 01:59:35.325 xxxxxxxxxx[62350:207] parseScreen -> screen title Annotation from Inception_HD.avi 
2011-02-05 01:59:35.325 xxxxxxxxxx[62350:207] rendition type MR 
2011-02-05 01:59:35.326 xxxxxxxxxx[62350:207] parseScreen ->media clip dictionary does not contain name 
2011-02-05 01:59:35.327 xxxxxxxxxx[62350:207] parseScreen ->media clip object dictionary name 
2011-02-05 01:59:35.327 xxxxxxxxxx[62350:207] parseScreen ->media clip object mime type video/avi 
Current language: auto; currently objective-c 
2011-02-05 01:59:39.080 xxxxxxxxxx[62350:207] parseScreen ->content dict type Filespec 
2011-02-05 01:59:40.206 xxxxxxxxxx[62350:207] parseScreen ->content dict does not have type 
2011-02-05 01:59:41.647 xxxxxxxxxx[62350:207] parseScreen -> contentdict UF Inception_HD.avi 
2011-02-05 01:59:44.234 xxxxxxxxxx[62350:207] parseScreen ->content f string Inception_HD.avi 
2011-02-05 01:59:45.472 xxxxxxxxxx[62350:207] parseScreen ->content dict does not have F string 
2011-02-05 01:59:47.772 xxxxxxxxxx[62350:207] parseScreen ->content dict does not contain Referenced file dictionary RF 
(gdb) continue 
2011-02-05 03:33:13.748 xxxxxxxxxx[62350:207] parseScreen ->documentCatalog does not contain Names dict 

我的想法是讓文件流，將其保存到臨時文件

CGPDFStringRef aTitle; // title is optional property. 
    if (!CGPDFDictionaryGetString(annotDict, "T", &aTitle)) { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen -> screen annot has no title"); 
#endif 
     //return; 
    }else { 
#if DEBUG 
    char *screenTitle = (char*)CGPDFStringGetBytePtr(aTitle); 

    NSLog(@"PDFScrollView parseScreen -> screen title %s",screenTitle); 
#endif 
    } 

    // get action 
    CGPDFDictionaryRef actionDict; 
    if(!CGPDFDictionaryGetDictionary(annotDict, "A", &actionDict)) { 
     return; 
    } 

    // parse action 

    const char* name; 

    if (!CGPDFDictionaryGetName(actionDict, "S", &name)) { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen -> screen annot has name attrib"); 
#endif 
     return; 
    } 

    NSString *actionType = [[NSString alloc] initWithCString:name]; 

    if (![actionType isEqualToString:RENDITION_ACTION_TYPE]) { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen -> screen annot action is not rendition"); 
#endif 
     return; 
    } 
    [actionType release]; 
    actionType = nil; 
    // get the rendition from the action dictionary 
    CGPDFDictionaryRef renditionDict; 
    if (!CGPDFDictionaryGetDictionary(actionDict, "R", &renditionDict)) { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen -> rendition action does not have rendition"); 
#endif  
     return; 
    } 
    // check if the rendition is media or selector 
    const char *renditionType; 
    if (!CGPDFDictionaryGetName(renditionDict, "S", &renditionType)) { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen -> rendition does not have type"); 
#endif 
     return; 
    } 
    // check rendition type 
#if DEBUG 
    NSLog(@"rendition type %s",renditionType); 
#endif 
    NSString *rendTypeString = [[NSString alloc]initWithCString:renditionType]; 
    if (![rendTypeString isEqualToString:@"MR"]) { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->rendition type is not MR --> %s",renditionType); 
#endif 
     return; 

    } 
    [rendTypeString release]; 
    rendTypeString =nil; 
    // get media clip dictionary 

    CGPDFDictionaryRef mediaclipDict; 
    if (!CGPDFDictionaryGetDictionary(renditionDict, "C", &mediaclipDict)) { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->rendition dictionary does not contain clip"); 
#endif 
     return; 
    } 


    const char * mediaClipType; 
    if (!CGPDFDictionaryGetName(mediaclipDict, "Type", &mediaClipType)) { // optional 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->media clip dictionary does not contain name"); 
#endif 


    } else { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->media clip object dictionary name %s",mediaClipType); 
#endif 
    } 

    char const *mediaClipSubtype; 
    if (!CGPDFDictionaryGetName(mediaclipDict, "S", &mediaClipSubtype)) { // required 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->media clip dictionary does not contain name"); 
#endif 

     return; 
    } 

    NSString *mediaClipSubtypeString = [[NSString alloc] initWithCString:mediaClipSubtype]; 
    if (![mediaClipSubtypeString isEqualToString:@"MCD"]) { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->media clip subtype is not MCD ==>%@",mediaClipSubtype); 
#endif  
     return; 
    } 

    [mediaClipSubtypeString release]; 
    mediaClipSubtype = nil; 

    // get media clip name 

    CGPDFStringRef mediaClipName; 
    if (!CGPDFDictionaryGetString (mediaclipDict, "N", &mediaClipName)) { // optional 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->media clip dictionary does not contain name"); 
#endif 

    } else { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->media clip object dictionary name %s",mediaClipName); 
#endif 
    } 

    // get ASCII MIME type 
    CGPDFStringRef mimeType; 
    if(!CGPDFDictionaryGetString(mediaclipDict, "CT", &mimeType)) { 

#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->media clip object does not contain mime type"); 
#endif 
    }else { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->media clip object mime type %s",CGPDFStringGetBytePtr(mimeType)); 
#endif 
    } 


    // get content stream 

    CGPDFDictionaryRef contentDict ; 
    if (!CGPDFDictionaryGetDictionary(mediaclipDict, "D", &contentDict)) { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->media clip object does not contain content dict"); 

#endif 
     return; 
    } 

    //check content type 
    const char *contentType; 

    if (!CGPDFDictionaryGetName(contentDict, "Type", &contentType)) { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->content dict does not have type"); 

#endif  
    }else { 

#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->content dict type %s",contentType); 

#endif 
    } 
    // get file system 
    const char *fileSystem; 
    if (!CGPDFDictionaryGetName(contentDict, "FS", &fileSystem)) { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->content dict does not have type"); 

#endif  
    }else { 

#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->content dict type %s",fileSystem ); 

#endif 
    } 

#if DEBUG 
    CGPDFStringRef description; 
    if (!CGPDFDictionaryGetString (contentDict, "UF", &description)) { 

     NSLog(@"PDFScrollView parseScreen ->content dict does not have type"); 


    }else { 
     NSLog(@"PDFSCrollView parseScreen -> contentdict UF %s",CGPDFStringGetBytePtr(description)); 
    } 

#endif 
    // check whether it is a file specification 
    if (strcmp(contentType, "Filespec")!=0) { // it is Filespec 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->content dict type %s is not file specification",contentType); 

#endif 
     return; 
    } 
    CGPDFStringRef fstring;// I get the file title 
    if (!CGPDFDictionaryGetString (contentDict, "F", &fstring)) { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->content dict does not have F string"); 

#endif  
    } 

#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->content f string %s",CGPDFStringGetBytePtr(fstring)); 

#endif 
    CGPDFStreamRef str;// here there's no stream at all 
    if (!CGPDFDictionaryGetStream (contentDict, "F", &str)) { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->content dict does not have F string"); 

#endif  
    } 

    // reference file 
    CGPDFArrayRef referencedFileDict ; 
    /*** does not find the RF ****/ 
    if (!CGPDFDictionaryGetArray (contentDict, "RF", &referencedFileDict)) { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->content dict does not contain Referenced file dictionary RF"); 

#endif 
    } 


    CGPDFDictionaryRef embeddedFileDict ; 

    if (!CGPDFDictionaryGetDictionary(contentDict, "EF", &embeddedFileDict)) { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->content dict does not contain embedded file dictionary EF"); 

#endif 
    } 
    // EF is found sucessfully 

    CGPDFDictionaryRef documentCatalog = CGPDFDocumentGetCatalog(_docRef); 

    CGPDFDictionaryRef namesDict; 


    if (!CGPDFDictionaryGetDictionary (documentCatalog, "Names", &namesDict)) { // optional 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->documentCatalog does not contain Names dict"); 
#endif 
     //return; 

    } 

    CGPDFDictionaryRef destsDict; 


    if (!CGPDFDictionaryGetDictionary (documentCatalog, "Dests", &destsDict)) { // optional 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->documentCatalog does not contain Names dict"); 
#endif 
     //return; 

    } 


    CGPDFDictionaryRef embeddedFilesDict ; 

    if (!CGPDFDictionaryGetDictionary(namesDict, "EmbeddedFiles", &embeddedFilesDict)) { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->namesDict does not contain embeddedFiles dict"); 
#endif 
     return; 

    } 

    CGPDFArrayRef namesArray; 
    if (!CGPDFDictionaryGetArray(namesDict, "Names", &namesArray)) { 
#if DEBUG 
     NSLog(@"PDFScrollView parseScreen ->names Dict does not contain Names"); 
#endif 
     return; 

    } 

控制檯輸出並且可以像adobe開發人員在adobe SDK中一樣使用它。

在此先感謝

Answer 1

我最終打包介質上的PDF文件以外的其他文件。我無法使用Apple Quartz庫掌握pdf上的流數據。