I am looking for a 64 bit solution to read a comment from a JPEG file... Any
ideas?
This does not work (it gets a dictionary containing image properties like
size, but the text comment I am interested in is not there):
NSURL* url = [NSURL fileURLWithPath:path];
CGImageRef imageRef = NULL;
CGImageSourceRef sourceRef;
sourceRef = CGImageSourceCreateWithURL((CFURLRef)url, NULL);
if(sourceRef)
{
CFDictionaryRef testDict =
CGImageSourceCopyPropertiesAtIndex(sourceRef,0,NULL);
}
This code DOES work, but is not 64bit compatible
FSRef theFSRef;
Handle dataRef;
OSType dataRefType;
GraphicsImportComponent theGIC;
ComponentResult result;
UserData theUserData;
Handle theDataHandle;
CFStringRef cfString = nil;
if (CFURLGetFSRef ((CFURLRef) [NSURL fileURLWithPath:path], &theFSRef))
{
result = QTNewDataReferenceFromFSRef (&theFSRef, 0, &dataRef,
&dataRefType);
if (result == noErr)
{
result = GetGraphicsImporterForDataRef (dataRef, dataRefType,
&theGIC);
if (result == noErr)
{
result = NewUserData (&theUserData);
if (result == noErr)
{
result = GraphicsImportGetMetaData (theGIC,
theUserData);
if (result == noErr)
{
theDataHandle = NewHandle (0);
if (theDataHandle)
{
result = GetUserDataText (theUserData,
theDataHandle,
kUserDataTextComment,
1, 0);
if (result == noErr)
{
HLock (theDataHandle);
cfString = CFStringCreateWithBytes
(kCFAllocatorDefault, (UInt8 *)
(*theDataHandle),
GetHandleSize(theDataHandle),
kCFStringEncodingMacRoman,
false);
HUnlock(theDataHandle);
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