HTTP Post Request in Objective-C Not Working

问题:

I am writing an HTTP Post request, but for some reason the parameters are not being added correctly, and I can't for the life of me figure out what I'm doing wrong. Here's what I have:

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init]; [request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData]; [request setHTTPShouldHandleCookies:NO]; [request setTimeoutInterval:30]; [request setHTTPMethod:@"POST"];  NSString *boundary = @"---------------------------14737809831466499882746641449";  // set Content-Type in HTTP header NSString *contentType = [NSString stringWithFormat:@"text; boundary=%@", boundary]; [request setValue:contentType forHTTPHeaderField: @"Content-Type"];  // post body NSMutableData *body = [NSMutableData data];  // Dictionary that holds post parameters.  NSMutableDictionary* _params = [[NSMutableDictionary alloc] init]; [_params setObject:subject forKey:@"subject"]; [_params setObject:message forKey:@"message"]; [_params setObject:[[UIDevice currentDevice] systemName] forKey:@"device"];  // add params  for (NSString *param in _params) {     [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];     [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", param] dataUsingEncoding:NSUTF8StringEncoding]];     [body appendData:[[NSString stringWithFormat:@"%@\r\n", [_params objectForKey:param]] dataUsingEncoding:NSUTF8StringEncoding]]; }  // the server url NSURL* requestURL = [NSURL URLWithString:CIVCManifest.contactFeed];  [body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];  // setting the body of the post to the reqeust [request setHTTPBody:body];  // set the content-length NSString *postLength = [NSString stringWithFormat:@"%d", [body length]]; [request setValue:postLength forHTTPHeaderField:@"Content-Length"];  // set URL [request setURL:requestURL];  NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; 

The request is getting through, however all the parameters are not being added properly. I had a Post script working that would upload a photo, and I copied and pasted most of it over to this one, but somehow this one is not working. Hopefully it's just a simple error I'm missing.

回答1:

Try this

 NSString *Post = [[NSString alloc] initWithFormat:@"Post Parameters"];     NSURL *Url = [NSURL URLWithString:@"Url"];      NSData *PostData = [Post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];      NSString *postLength = [NSString stringWithFormat:@"%d", [PostData length]];      NSMutableURLRequest *Request = [[NSMutableURLRequest alloc] init];     [Request setURL:Url];     [Request setHTTPMethod:@"POST"];     [Request setValue:postLength forHTTPHeaderField:@"Content-Length"];     [Request setValue:@"application/json" forHTTPHeaderField:@"Accept"];     [Request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];     [Request setHTTPBody:PostData]; 

文章来源: HTTP Post Request in Objective-C Not Working