I'm trying to read comment field from file.
Found this thread about how to do it, but can't find MDItem
corresponding class in Xamarin
.
Any ideas where to find it or what to use instead?
Some of the CoreServices
are not wrapped within the current Xamarin.Mac
(Version: 2.10.0.57).
Most of them pass CFxxxx
-based references around, so they are easy to wrap and implement via some Interop calls.
var fileURL = NSUrl.FromString("/Users/sushi/Desktop/DFeedback_FeedBack.png");
var mMDItemRef = MDItemCreateWithURL(IntPtr.Zero, fileURL.Handle);
var mCFTypeRef = MDItemCopyAttribute(mMDItemRef, new CFString("kMDItemFinderComment").Handle);
var finderComment = NSString.FromHandle(mCFTypeRef);
Console.WriteLine(finderComment);
Note: The interop calls should be tested for null in production code, see return signature comments in header file.
StackOverflow
// @function MDItemCreateWithURL
// Returns an metadata item for the given path.
// @param allocator The CFAllocator which should be used to allocate
// memory for the query and its sub-storage.This
// parameter may be NULL in which case the current default
// CFAllocator is used.
// @param url A url to the file for which to create the MDItem.
// [[Currently, the file must exist.MDItemRefs may or
// may not be uniqued.Use CFEqual() to compare them.]]
// @result An MDItemRef, or NULL on failure.
//MD_EXPORT MDItemRef MDItemCreateWithURL(CFAllocatorRef allocator, CFURLRef url) AVAILABLE_MAC_OS_X_VERSION_10_6_AND_LATER;
[DllImport(Constants.CoreServicesLibrary)]
extern static /* MDItemRef */ IntPtr MDItemCreateWithURL(/* CFAllocatorRef __nullable */ IntPtr allocator, /* CFURLRef */ IntPtr inURL);
//@function MDItemCopyAttribute
//Returns the value of the given attribute for the item.
//@param item The item to be interrogated.
//@param name The name of the desired attribute.
//@result A CFTypeRef, or NULL on failure, or if the attribute
//does not exist, of if the attribute is not readable.
//MD_EXPORT CFTypeRef MDItemCopyAttribute(MDItemRef item, CFStringRef name) MD_AVAIL;
[DllImport(Constants.CoreServicesLibrary)]
extern static /* CFTypeRef */ IntPtr MDItemCopyAttribute(/* MDItemRef */ IntPtr item, /* CFStringRef */ IntPtr name);
MDItem.h
Local Xcode Ref:: /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/Metadata.framework/Versions/A/Headers