What others have suggested are good, but I also wanted to point out something:
On Jan 13, 2010, at 9:30 AM, rohan a wrote:
> Using the new NSURL methods available with Cocoa on Mac OS X 10.6, I am
> trying to create an alias file to a certain file. However, this method
> requires a NSURL data type. But I am writing a C program along with an
> objective-C program to accomplish this. The C program would accept the
> inputs as C strings. I would then convert them to NSString and then to NSURL
> strings. However, this is not working :(
> By hardcoding the NSURL strings the program works fine.
> #import <Foundation/Foundation.h>
>
> int CreateAlias(const char *target, const char *aliasname)
> {
> CFStringRef Ref1 = CFStringCreateWithCString(NULL, target,
> kCFStringEncodingASCII);
>
> CFStringRef Ref2 = CFStringCreateWithCString(NULL, aliasname,
> kCFStringEncodingASCII);
>
> if (Ref1 == NULL || Ref2 == NULL)
> exit(1);
>
> NSString *Destination = (NSString *)Ref1;
> NSString *Alias = (NSString *)Ref2;
> //NSURL *src = [NSURL URLWithString:@"file:///Alias_dir/aliastext"];
> //NSURL *dest = [NSURL URLWithString:@
> "file:///Alias_dir/aliastext.alias"];
>
> NSURL *src = [NSURL URLWithString:Destination];
> NSURL *dest = [NSURL URLWithString:Alias];
Are the strings file paths or URL strings? It's important to recognize that
those are not the same things. In your commented-out literals, you are passing
file URL strings, which is appropriate. However, if target and aliasname (and
thus Ref1 and Ref2) are not file URL strings but file paths, then you should be
creating the NSURL objects with +fileURLWithPath: rather than +URLWithString:.
(And, no, prepending "file://" to a file path does not make it a valid file URL
string. For example, file paths may have spaces in them, while that's not
allowed for URL strings.)
Regards,
Ken
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