Objective-C中的HTTP發佈請求無法正常工作

Question

我正在編寫一個HTTP Post請求，但由於某些原因，參數沒有被正確添加，而且我不能爲我的生活弄清楚我做錯了什麼。這是我有：

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]; 

請求正在通過，但所有參數都沒有正確添加。我有一個Post腳本能夠上傳照片，並且我將其大部分複製並粘貼到這張照片上，但不知怎的，這張照片無法正常工作。希望這只是我錯過的一個簡單的錯誤。

Answer 1

試試這個

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];