Question

I have an array returned from a web service containing byte values (non binary format, i.e. 0-255). These represent a thumbnail image. I want need to create an NSData object from these values. How can I do this?

Answer 1

+ (id)dataWithBytes:(const void *)bytes length:(NSUInteger)length is your friend:

void bytesToNSDataExample() {
    unsigned char bytes[] = {'h', 'e', 'l', 'l', 'o'};
    NSData *data = [NSData dataWithBytes:bytes length:5];

    NSString *string = [[NSString alloc] initWithData:data encoding:NSISOLatin1StringEncoding];
    NSLog(@"%@", string);

    // if data was a image like in your case, you would probably do something like this:
    NSImageRep *imgRep = [NSBitmapImageRep imageRepWithData:data];
}