ASIHTTPRequest: Encoding in post data

Question

I'm using ASIHTTPRequest to send a form this way:

ASIFormDataRequest *request = [[[ASIFormDataRequest alloc] initWithURL:url] autorelease];
[request setPostValue:foo forKey:@"post_var"];

How can I set the encoding of the nsstring foo??

The web receiving the form data expects the value in ISOLatin1

Answer 1

const char *_cFoo = "bar";
NSString *_foo = [[NSString alloc] initWithCString:_cFoo encoding:NSISOLatin1StringEncoding];
ASIFormDataRequest *request = [[[ASIFormDataRequest alloc] initWithURL:url] autorelease];
[request setPostValue:_foo forKey:@"post_var"];
// ...
[request trigger];
[_foo release];

EDIT: I'm not sure why the above wouldn't work. I guess I should try it out. But looking at the source for ASIHTTPRequest, the -setPostValue:forKey: method looks like it takes any NSObject subclass for a POST value:

- (void)setPostValue:(id <NSObject>)value forKey:(NSString *)key
{
   if (![self postData]) {
       [self setPostData:[NSMutableDictionary dictionary]];
   }
   [[self postData] setValue:[value description] forKey:key];
   [self setRequestMethod:@"POST"];
}

Perhaps convert an NSString to a C string and use its NSData representation as the POST variable value:

NSString *_foo = @"bar";
const char *_cFoo = [_foo cStringUsingEncoding:NSISOLatin1StringEncoding];
NSData *_cFooData = [NSData dataWithBytes:_cFoo length:strlen(_cFoo)];
[request setPostValue:_cFooData forKey:@"post_var"];