CoreFoundation Example

CF

{
    /* First of all, we need a C array to store our dictionary keys */
    CFStringRef keys[ 2 ];

    /*
     * Let's create the dictionary keys. First key is straightforward because
     * of the CFSTR macro, while the second one is less...
     */
    keys[ 0 ] = CFSTR( "key-1" );
    keys[ 1 ] = CFStringCreateWithCString
    (
        ( CFAllocatorRef )NULL,
        externalKey,
        kCFStringEncodingUTF8
    );

    /* Let's create the data object from the external byte buffer */
    CFDataRef data = CFDataCreate
    (
        ( CFAllocatorRef )NULL,
        ( const UInt8 * )externalByteBuffer,
        ( CFIndex )externalByteBufferLength
    );

    /*
     * Now, let's create some number object. Note that we need a temporary
     * variable, as we need to pass an address of a primitive type...
     */
    int tempInt        = 42;
    CFNumberRef number = CFNumberCreate
    (
        ( CFAllocatorRef )NULL,
        kCFNumberSInt32Type,
        &tempInt
    );

    /*
     * Now, create an URL object. Note that we need to create a temporary
     * CFString object
     */
    CFStringRef tempStringURL = CFStringCreateWithCString
    (
        ( CFAllocatorRef )NULL,
        externalURL,
        kCFStringEncodingUTF8
    );
    CFURLRef url = CFURLCreateWithString
    (
        ( CFAllocatorRef )NULL,
        tempStringURL,
        NULL
    );

    /* Before creating the array, we need a C array to store the values */
    CFTypeRef arrayValues[ 2 ];

    arrayValues[ 0 ] = number;
    arrayValues[ 1 ] = url;

    /* Now we can create the array... */
    CFArrayRef array = CFArrayCreate
    (
        ( CFAllocatorRef )NULL,
        ( const void ** )arrayValues,
        2,
        &kCFTypeArrayCallBacks
    );

    /* Now, of course, we need a C array to store the dictionary values */
    CFTypeRef values[ 2 ];

    values[ 0 ] = data;
    values[ 1 ] = array;

    /* Finally, we can create our dictionary... */
    CFDictionaryRef dictionary = CFDictionaryCreate
    (
        ( CFAllocatorRef )NULL,
        ( const void ** )keys,
        ( const void ** )values,
        2,
        &kCFTypeDictionaryKeyCallBacks,
        &kCFTypeDictionaryValueCallBacks
    );

    /* And of course, as we allocated objects, we need to release them... */
    CFRelease( keys[ 1 ] );
    CFRelease( data );
    CFRelease( number );
    CFRelease( tempStringURL );
    CFRelease( url );
    CFRelease( array );

    /* That's it, prints the dictionary and release it */
    CFShow( dictionary );
    CFRelease( dictionary );
}