twitpic API未連接（multipart/form-data）objective-c

Question

我已經將許多研究中的代碼放在一起。 對twitpic API信息是在這裏：

http://twitpic.com/api.do#uploadAndPost

通過調試，我可以告訴大家，字典是很好的，而且它獲得通過所有方法，請求被提交，但隨後的NSLog方法返回<>。

我不知道我可能會出錯，我不太瞭解多部分/表單數據結構。也許我的連接有問題？

下面的代碼。

-(void)uploadBoth { 
     //Create dictionary of post arguments 
     NSArray *keys = [[NSArray alloc] initWithObjects:@"media",@"username",@"password",@"message",nil]; 
     NSArray *objects = [[NSArray alloc] initWithObjects: 
      imageData, twitterUserSave, twitterPassSave, [NSString stringWithFormat:@"%@",messageView.text], nil]; 

     NSDictionary *keysDict = [[NSDictionary alloc] initWithObjects:objects forKeys:keys]; 
    NSLog(@"%@", keysDict); 

     //create twitpic photo post 
     NSURLRequest *twitpicPost = [self twitpicRequest:keysDict withData:imageData]; 

     //send request, return YES if successful 
     NSURLConnection *twitpicConnection = [[NSURLConnection alloc] initWithRequest: twitpicPost delegate:self]; 

     if (!twitpicConnection) { 
     NSLog(@"Failed to submit request"); 
     } else { 
     NSLog(@"Request submitted"); 
     NSData *receivedData = [[NSMutableData data] retain]; 
     NSLog(@"%@", receivedData); // THIS PART RETURNS <> 
     } 
    } 

的的NSURLRequest部分

-(NSURLRequest *)twitpicRequest:(NSDictionary *)postKeys withData:(NSData *)data { 

NSLog(@"got this far"); 

    //create the URL POST Request to twitpic 
    NSURL *twitpicURL = [NSURL URLWithString:@"http://twitpic.com/api/uploadAndPost"]; 
    NSMutableURLRequest *twitpicPost = [NSMutableURLRequest requestWithURL:twitpicURL]; 
    [twitpicPost setHTTPMethod:@"POST"]; 

    //Add the header info 
    NSString *stringBoundary = [NSString stringWithString:@"0xAbCdEfGbOuNdArY"]; 
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",stringBoundary]; 
    [twitpicPost addValue:contentType forHTTPHeaderField: @"Content-Type"]; 

    //create the body 
    NSMutableData *postBody = [NSMutableData data]; 
    [postBody appendData:[[NSString stringWithFormat:@"--%@\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; 

    //add key values from the NSDictionary object 
    NSEnumerator *keys = [postKeys keyEnumerator]; 
    int i; 
    for (i = 0; i < [postKeys count]; i++) { 
    NSString *tempKey = [keys nextObject]; 
    [postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n",tempKey] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[[NSString stringWithFormat:@"%@",[postKeys objectForKey:tempKey]] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
    } 

    //add data field and file data 
    [postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"data\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; 
    [postBody appendData:[NSData dataWithData:data]]; 
    [postBody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; 

    //add the body to the post 
    [twitpicPost setHTTPBody:postBody]; 

return twitpicPost; 
} 

Answer 1

你的輸出有意義給您打印數據，而無需等待其下載：

NSData *receivedData = [[NSMutableData data] retain]; // this is a new empty data object 
NSLog(@"%@", receivedData); // THIS PART RETURNS <> 

你應該申報 「receivedData」 作爲「 NSMutableData「引用位於實現文件的頂部（或作爲類頭中的實例變量）。然後，您應該按照Using NSURLConnection的清單2-5中所述實施代理方法。

否則，您可能希望通過努力得到同步請求工作開始：

NSURLResponse* response; 
NSError* error; 
NSData* result = [NSURLConnection sendSynchronousRequest:twitpicPost returningResponse:&response error:&error]; 
NSLog(@"%@",[[[NSString alloc] initWithData:result encoding:NSASCIIStringEncoding] autorelease]);