使用iPhone SDK阅读PDF文档时出现问题？

Question

任何人成功尝试使用iPhone API读取PDF文档的目录词典？我没有得到任何有意义的东西：目录中的大多数字典都是空的。

Answer 1

试试这个：

CGPDFDictionaryRef catalog = CGPDFDocumentGetCatalog(myDocument); 
CGPDFDictionaryApplyFunction(catalog, streamInfoFunction, catalog); 

的目录基本上是一本字典，你有你使用就可以了施放功能，如图所示。

void streamInfoFunction (const char *key,CGPDFObjectRef object, void *info) 
{ 
NSLog(@"---------------------------------------------------------------------------------------------"); 
NSLog(@"Processing Stream Info"); 

NSString *keyStr = [NSString stringWithCString:key encoding:NSUTF8StringEncoding]; 
CGPDFDictionaryRef contentDict = (CGPDFDictionaryRef)info; 

CGPDFObjectType objectType = CGPDFObjectGetType(object); 
if(objectType == kCGPDFObjectTypeDictionary) 
{ 
    CGPDFDictionaryRef value = NULL; 
    CGPDFDictionaryGetDictionary(contentDict, key, &value); 
    NSLog(@"Value for key %@ is %d",keyStr,CGPDFDictionaryGetCount(value)); 
     //S.SNSLog(@"%@",value); 
} 
else if(objectType == kCGPDFObjectTypeArray) 
{ 
    CGPDFArrayRef value = NULL; 
    CGPDFDictionaryGetArray(contentDict, key, &value); 
    NSLog(@"Value for key %@ is %d",keyStr,CGPDFArrayGetCount(value)); 
     //S.SNSLog(@"%@",value); 
} 
else if(objectType == kCGPDFObjectTypeStream) 
{ 
    CGPDFStreamRef value = NULL; 
    CGPDFDictionaryGetStream(contentDict, key, &value); 
    NSLog(@"Processing for key %@",keyStr); 
    CGPDFDataFormat dataFormat; 
    CFDataRef streamData = CGPDFStreamCopyData(value, &dataFormat); 
    CFShow(streamData); 
    NSString *contentString = [[NSString alloc]initWithBytes:[(NSData*)streamData bytes] length:[(NSData*)streamData length] encoding:NSUTF8StringEncoding]; 
    NSLog(@"%@",contentString); 

} 
else if(objectType == kCGPDFObjectTypeInteger) 
{ 
    CGPDFInteger integerValue; 
    CGPDFDictionaryGetInteger(contentDict, key, &integerValue); 
    NSLog(@"Processing for Key %@ value %d",keyStr,integerValue); 

} 
else if(objectType == kCGPDFObjectTypeName) 
{ 
    const char *name; 
    CGPDFDictionaryGetName(contentDict, key, &name); 
    NSLog(@"Processing for key %@ value %s",keyStr,[NSString stringWithCString:name encoding:NSUTF8StringEncoding]); 
} 

NSLog(@"---------------------------------------------------------------------------------------------"); 

} 

对于一般参考，参见：Fast and Lean PDF Viewer for iPhone/iPad/iOs - tips and hints?