Http Post Request

Question

How to make Http Post Request using JSON .I tried every option which is available on Internet .but couldnot get the Data .So please post entire code to make a request

Answer 1

This isn't a "code it for me for free" site. The way this works is, you post your code and people help you make it work.

That said, you should google ASIHTTPRequest. It's a very robust but relatively very simple HTTP client library, and the "how to use it" page has plenty of sample code.

Answer 2

Here's a basic example of NSURLConnection POST-ing JSON to an URL.

- (void)performRequest {
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://someplace.com/"]];
    [request setValue:@"Some Value" forHTTPHeaderField:@"Some-Header"];
    [request setHTTPBody:@"{\"add_json\":\"here\"}"];
    [request setHTTPMethod:@"POST"];
    [NSURLConnection connectionWithRequest:[request autorelease] delegate:self];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
     // Fail..
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
     // Request performed.
}

Answer 3

You can use below code:

-(void)performRequest{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"url"]];
    NSString *msgLength = [NSString stringWithFormat:@"%d", [jsonMessage length]];
    [request addValue: @"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
    [request addValue: jsonAction forHTTPHeaderField:@"JSONAction"];
    [request addValue: msgLength forHTTPHeaderField:@"Content-Length"];
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody: [jsonMessage dataUsingEncoding:NSUTF8StringEncoding]];
    NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    if( theConnection )
    {
        webData = [[NSMutableData data] retain];
    }
    else
    {
        NSLog(@"theConnection is NULL");
    }
    [pool release];
}

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
    [webData setLength: 0];
    self.resultArray = [[NSMutableArray alloc] init];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
    [webData appendData:data];
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
    NSLog(@"ERROR with theConenction");
    NSDictionary *errorDic = [NSDictionary dictionaryWithObject:error forKey:@"error"];
    [self.resultArray addObject:errorDic];
    [connection release];
    [webData setLength:0];
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
    NSLog(@"DONE. Received Bytes: %d", [webData length]);
    NSString *theXML = [[NSString alloc] initWithBytes: [webData mutableBytes] length:[webData length] encoding:NSUTF8StringEncoding];
    NSLog(@"%@", theXML);
    [theXML release];
    if([webData length] > 0){
        parser = [[NSXMLParser alloc] initWithData:webData];
        [parser setDelegate:self];
        [parser parse]; 
    }
}