HTTP POST to Imageshack

问题

I am currently uploading images to my server via HTTP POST. Everything works fine using the code below.

NSString *UDID = md5([UIDevice currentDevice].uniqueIdentifier);
NSString *filename = [NSString stringWithFormat:@"%@-%@", UDID, [NSDate date]];
NSString *urlString = @"http://taptation.com/stationary_data/index.php";
request= [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:@"POST"];
NSString *boundary = @"---------------------------14737809831466499882746641449";
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
[request addValue:contentType forHTTPHeaderField: @"Content-Type"];
NSMutableData *postbody = [NSMutableData data];
[postbody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[postbody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"userfile\"; filename=\"%@.jpg\"\r\n", filename] dataUsingEncoding:NSUTF8StringEncoding]];
[postbody appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[postbody appendData:[NSData dataWithData:imageData]];
[postbody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[request setHTTPBody:postbody];

NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
NSLog(returnString);

However, when I try to convert this to work with Image Shacks XML API, it doesn't return anything. The directions from ImageShack are below.

Send the following variables via POST to imageshack. us /index.php

fileupload; (the image) xml = "yes"; (specifies the return of XML) cookie; (registration code, optional)

Does anyone know where I should go from here?

回答1:

You might want to consider using ASIHTTPRequest, as it will build a form data post body for you with a lot less hassle, and can stream the request body from disk, so you'll save memory when uploading large images.

A quick google found this, which seems to suggest you should be posting to /upload_api.php rather than /index.php.

Something like this would probably be a good start:

ASIFormDataRequest *request = [[[ASIFormDataRequest alloc] initWithUrl:[NSURL URLWithString:@"http://www.imageshack.us/upload_api.php"]] autorelease];
[request setFile:@"/path/to/file" forKey:@"fileupload"];
[request setPostValue:@"yes" forKey:@"xml"];
[request setPostValue:@"blahblah" forKey:@"cookie"];
//It looks as though you probably need these too
[request setPostValue:@"me@somewhere.com" forKey:@"email"];
[request setPostValue:@"blah" forKey:@"key"];
[request start];
if ([request error]) {
    NSLog(@"%@",[request error]);
} else {
    NSLog([request responseString]); // The xml that got sent back
}

Warning: untested!

I've used a synchronous request because you did, but you almost certainly should be using an asynchronous request instead (a queue with ASIHTTPRequest).

回答2:

Took me a while, but you need to use ASIHTTPREQUEST!

- (void)uploadToImageShack {
NSAutoreleasePool *paul = [[NSAutoreleasePool alloc] init];
UIImage *tempImage = self.selectedimage;
ASIFormDataRequest *request = [[[ASIFormDataRequest alloc] initWithURL:[NSURL URLWithString:@"http://www.imageshack.us/upload_api.php"]] autorelease];
NSData *imageData = UIImagePNGRepresentation(tempImage);
[request setFile:imageData withFileName:@"image" andContentType:@"image/png" forKey:@"fileupload"];
[request setPostValue:@"yes" forKey:@"xml"];
[request setPostValue:@"3ZQ7C09K708fce677d9cadee04811cfcbdf63361" forKey:@"key"];
[request setUseCookiePersistence:NO];
[request startSynchronous];
NSError *error = [request error];
if (error) {
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:[error localizedDescription] delegate:nil cancelButtonTitle:@"Dismiss" otherButtonTitles:nil];
    [alert show];
    [alert release];
}
else if (!error) {
    if ([request responseString]) {
        parser = [[NSXMLParser alloc] initWithData:[[NSData alloc] initWithData:[request responseData]]];
        [parser setDelegate:self];
        [parser parse];
    }
}   
[paul drain];
}

来源：https://stackoverflow.com/questions/931088/http-post-to-imageshack