Question

I am trying to create a NSMutableURLRequest like this:

NSURL *URLWithString = [
    NSString stringWithFormat:@"%@?%@",
    urlString,
    datas
];
NSMutableURLRequest* request = [[[NSMutableURLRequest alloc] initWithURL:URLWithString] autorelease];

When I run it on my iPhone 4S, the app crashes and I get the following exception:

2012-10-30 15:58:53.495 [429:907] -[__NSCFString absoluteURL]:
unrecognized selector sent to instance 0x1cd74a90

2012-10-30 15:58:53.497 [429:907] — Terminating app due to uncaught
exception ‘NSInvalidArgumentException’, reason: ‘-[__NSCFString
absoluteURL]: unrecognized selector sent to instance 0x1cd74a90’

— First throw call stack:

(0x361b62a3 0x344c697f 0x361b9e07 0x361b8531 0x3610ff68 0x3611363f
0x320396e7 0x32039551 0x320394ed 0x33bde661 0x33bde597 0x387e1
0x376d9f1f 0x376da9a9 0x341c535d 0x3618b173 0x3618b117 0x36189f99
0x360fcebd 0x360fcd49 0x366392eb 0x374db301 0x37cc1 0x37c58)

libc++abi.dylib: terminate called throwing an exception

What’s wrong?

Answer 1

Lots of issues:
For a start look into how to invoke NSString and NSURL methods. I have done it for the code you have pasted.

NSURL * myUrl = [NSURL URLWithString:[NSString stringWithFormat:@"%@?%@",urlString,datas]];

and

NSMutableURLRequest* request = [[[NSMutableURLRequest alloc] initWithURL:myUrl] autorelease];