Re: no subject

[Richard Frith-Macdonald]

On 14 Apr 2008, at 10:41, Sebastian Reitenbach wrote:

> Hi,
>
> I tried to download a csv file from a webserver.I found an example  
> using
> NSURL.
> As the documentation says, NSURL needs an
> escaped string, so I used
> stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding, so I  
> wrote
> the test below:
> =================Sample Program================================
> #include <Foundation/Foundation.h>
>
> int
> main(int argc, const char *argv[])
> {
>  id pool = [[NSAutoreleasePool alloc] init];
>
>  NSString *GKey =
> @"ABQIAAAAvp3__HwvT3VkixIIbsW0axQuKI_6t1bH2P0vCI_Q8jfpn8qdNBQMnneljxh9czilkau_bYSCXteS_A 
> ";
>
>
>
>  NSString *Address = @"Potsdamer+Platz+Berlin+Germany";
>  NSString *URLString = [NSString
> stringWithFormat:@"http://maps.google.com/maps/geo?q= 
> %@&output=csv&key=%@",
> Address, GKey];
>  URLString = [URLString
> stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

That last line is wrong ... the method is for fixing strings which are  
not legal as parts of a URL so that they can be used within a URL ...  
if you apply the method to en entire URL, what you get is obviously  
not a URL, but rather a string containing characters which are legal  
to put inside a URL.
While the first sentence of the GNUstep documentation for the method  
is perhaps unclear (I've tried to clarify it), the remainder of the  
documentation goes on to explain exactly what the method does.  It  
also warns that, where you are filling in form fields (as in the  
example above), you need to perform additional escaping for '+','='  
and '&' because the implementation does not do that for you (to  
maintain macos compatibility).