(Objective-C) Get a String Property Value from XMP

Demonstrates how to open a JPG or TIF image file, access the XMP metadata, and fetch the value of a string property, such as the Location.

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#import <CkoXmp.h>
#import <CkoXml.h>
#import <NSString.h>

// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

CkoXmp *xmp = [[CkoXmp alloc] init];

// Load a JPG or TIF image file.
// Sample JPG's with XMP metadata may be found at:
// http://www.chilkatsoft.com/testData/xmp/sample1.jpg
// http://www.chilkatsoft.com/testData/xmp/sample2.jpg
// http://www.chilkatsoft.com/testData/xmp/sample3.jpg
BOOL success = [xmp LoadAppFile: @"sample1.jpg"];
if (success != YES) {
    NSLog(@"%@",xmp.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Num embedded XMP docs: ",[xmp.NumEmbedded intValue]);

// Assuming there is at least one, get the 1st.
// (There is typically never more than one, but theoretically it's possible.)
CkoXml *xml = 0;
xml = [xmp GetEmbedded: [NSNumber numberWithInt: 0]];
if (xmp.LastMethodSuccess == YES) {

    NSString *propVal = [xmp GetSimpleStr: xml propName: @"Iptc4xmpCore:Location"];
    if (xmp.LastMethodSuccess != YES) {
        NSLog(@"%@",@"Not found.");
    }
    else {
        NSLog(@"%@",propVal);
    }

}
else {
    NSLog(@"%@",xmp.LastErrorText);
}