I'm all for just a little guidance, and thank you for it. Everything you
said makes sense now, and I have it working:
NSString *searchStr = @"\nJOY\n";
const char *cString = [searchStr UTF8String];
const char *fileBytes = [stringFileContents bytes];
char *ptr = strstr(fileBytes, cString);
Thanks again
On Thu, Apr 16, 2009 at 4:43 PM, Greg Guerin <glgue...@amug.org> wrote:
> Miles wrote:
>
> NSString *searchStr = @"\njoy\n";
>> NSData *strData = [searchStr
>> dataUsingEncoding:NSUTF8StringEncoding];
>> const char *strBytes = [strData bytes];
>>
>
> Think about what you're doing here, then look at the NSString method
> -UTF8String.
>
> Also, think about whether dataUsingEncoding: includes or excludes a
> terminating null. For example, if searchStr were assigned @"", what is the
> length of the resulting strData, and exactly what does [strData bytes]
> return? A combination of referring to reference docs and some experimenting
> is the usual approach here.
>
> Next, consider the above in light of the args to strstr(), which are
> expected to be null-terminated C-style strings.
>
> Finally, consider what happens if searchStr isn't found. I urge you to try
> it with a searchStr assigned a misspelled word like @"spelchek".
>
> If it seems like I'm asking you to debug and understand your own code
> without asking the list for the complete answer, you're right. This is a
> pretty elementary example to work on, and there's no substitute for being
> able to figure it out for yourself. If you can't debug this one without
> direct assistance, you will be lost at sea when the debugging gets harder
> (and it WILL get harder).
>
> -- GG
>
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