Re: NSData dataWithBytes:Length: all 00
Re: NSData dataWithBytes:Length: all 00
- Subject: Re: NSData dataWithBytes:Length: all 00
- From: "Stephen J. Butler" <email@hidden>
- Date: Tue, 21 Jul 2009 15:47:44 -0500
On Tue, Jul 21, 2009 at 3:38 PM, Chase Meadors<email@hidden> wrote:
> I have the following code, which is a category on NSData. It is always
> called on especially designated NSData objects with four bytes.
>
> - (NSData *)resolve {
>
> unsigned char *buf = [self bytes];
>
> const unsigned char *newBytes[4] = { (buf[3] - 0x08), buf[2], buf[1],
> buf[0] };
When I compile this line, I get all kinds of warnings. Do you? And if
you do, why are you ignoring them? The warning helps point to what is
wrong.
You've allocated an array of four POINTERS, when what you want is an
array of four UNSIGNED CHARACTERS. So it should be:
const unsigned char newBytes[4] = { (buf[3] - 0x08), buf[2], buf[1], buf[0] };
> for (int i = 0; i < 4; i ++) {
> NSLog(@"X", newBytes[i]);
> }
>
> NSData *ret = [NSData dataWithBytes:newBytes length:4];
> return ret;
>
> }
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