ASIHTTPRequest Request Cancel - iphone

Question

I have been using ASIHTTPRequest to fetch the data and i want to cancel the request how i do it??
i do the code just like this..
-(void) serachData{
NSURL *url= [NSURL URLWithString:self.safestring];
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
[request setTimeOutSeconds:7200];
[request setDelegate:self];
[request startAsynchronous];
}
- (NSMutableDictionary *)requestFinished:(ASIHTTPRequest *)request
{
NSLog(#"requestFinished");
NSString *responseString = [request responseString];
SBJsonParser *json = [[SBJsonParser alloc] init];
NSMutableArray *array = [[NSMutableArray alloc] initWithObjects[jsonobjectWithString:responseString], nil];
NSLog(#"array %#",array);
}
- (void)requestFailed:(ASIHTTPRequest *)request{
NSLog(#"requestFailed");
}
//if i press cancel button(when requestFinished /requestFailed method in process ) then the ASIHTTPRequest fail and finish method Stop /abort! how i do this??
-(IBAction)CancleREquest:(id)sender{
NSLog(#"CancleREquest");
}

Answer 1

Your cancel specific ASIHTTPRequest then :
if(![yourASIHTTPRequest isCancelled])
{
// Cancels an asynchronous request
[yourASIHTTPRequest cancel];
// Cancels an asynchronous request, clearing all delegates and blocks first
[yourASIHTTPRequest clearDelegatesAndCancel];
}
Note : To cancel all ASIHTTPRequest then :
for (ASIHTTPRequest *request in ASIHTTPRequest.sharedQueue.operations)
{
if(![request isCancelled])
{
[request cancel];
[request setDelegate:nil];
}
}
EDIT : Use AFNetworking as ASIHTTPRequest is deprecated as its has not been update since march 2011.

Answer 2

Nice simple version:
for (ASIHTTPRequest *request in ASIHTTPRequest.sharedQueue.operations){
[request cancel];
[request setDelegate:nil];
}

Answer 3

I suggest you to keep a reference to the pending request in an ivar/property of your controller, then send the cancel message to it from your button handler.
//-- in your class interface:
#property (nonatomic, assign) ASIFormDataRequest *request;
....
//-- in your class implementation:
#synthesize request;
.....
-(void) serachData{
NSURL *url= [NSURL URLWithString:self.safestring];
self.request = [ASIFormDataRequest requestWithURL:url];
[self.request setTimeOutSeconds:7200];
[self.request setDelegate:self];
[self.request startAsynchronous];
}
-(IBAction)CancleREquest:(id)sender{
[self.request cancel];
NSLog(#"request Canceled");
}
You have several options when canceling, though; from ASIHTTPRequest docs:
Cancelling an asynchronous request
To cancel an asynchronous request (either a request that was started with [request startAsynchronous] or a request running in a queue you created), call [request cancel]. Note that you cannot cancel a synchronous request.
Note that when you cancel a request, the request will treat that as an error, and will call your delegate and/or queue’s failure delegate method. If you do not want this behaviour, set your delegate to nil before calling cancel, or use the clearDelegatesAndCancel method instead.
// Cancels an asynchronous request
[request cancel]
// Cancels an asynchronous request, clearing all delegates and blocks first
[request clearDelegatesAndCancel];