使用ASIHTTP来POST表单

Sending data

Setting request headers

ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request addRequestHeader:@"Referer" value:@"http://allseeing-i.com/"];

Sending a form POST with ASIFormDataRequest

To send POST data in a manner compatible with web page forms, use the included ASIFormDataRequest subclass. Data is posted in ‘application/x-www-form-urlencoded’ format, or ‘multipart/form-data’ format when uploading binary data or files. Data in files is read as needed from disk, so POSTing large files is OK, as long as your web server is setup to handle them.

ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
[request setPostValue:@"Ben" forKey:@"first_name"];
[request setPostValue:@"Copsey" forKey:@"last_name"];
[request setFile:@"/Users/ben/Desktop/ben.jpg" forKey:@"photo"];

ASIFormDataRequest will autodetect the mime type of files (on iOS 3.0 or later an Mac) added to the POST via setFile:forKey:, and include this in the mime headers sent to the server. If you prefer, you can use the longer form to override this:

ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
 
// Upload a file on disk
[request setFile:@"/Users/ben/Desktop/ben.jpg" withFileName:@"myphoto.jpg" andContentType:@"image/jpeg"
forKey:@"photo"];
 
// Upload an NSData instance
[request setData:imageData withFileName:@"myphoto.jpg" andContentType:@"image/jpeg" forKey:@"photo"];
 

You can send multiple values for the same parameter using the alternative add API:

ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
[request addPostValue:@"Ben" forKey:@"names"];
[request addPostValue:@"George" forKey:@"names"];
[request addFile:@"/Users/ben/Desktop/ben.jpg" forKey:@"photos"];
[request addData:imageData withFileName:@"george.jpg" andContentType:@"image/jpeg" forKey:@"photos"];

See ASIFormDataRequest.h for a full list of all the ways to add parameters to your POST.

PUT requests and custom POSTs

If you want to send data via PUT, or want to send it with POST but prefer to create the POST body yourself, use appendPostData: or appendPostDataFromFile:.

ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request appendPostData:[@"This is my data" dataUsingEncoding:NSUTF8StringEncoding]];
// Default becomes POST when you use appendPostData: / appendPostDataFromFile: / setPostBody:
[request setRequestMethod:@"PUT"];

If you want to send large amounts of data and aren’t using an ASIFormDataRequest, see the information on streaming post bodies from disk below.