如何让HTTP post请求获取JSON对象以响应iPhone应用程序

Question

我在服务器上运行了一个web服务，它以XML格式或JSON格式返回数据。我想请求JSON格式，但使用HTTPPost方法。

Answer 1

这是适用于JSON post请求的代码，TouchJSON框架用于解析JSON，感谢"schwa"。

NSArray *keys = [NSArray arrayWithObjects:@"username", @"password", @"preference", @"uid", nil];
NSArray *objects = [NSArray arrayWithObjects:@"accuser", @"accpass", @"abc_region", @"100", nil];
NSDictionary *theRequestDictionary = [NSDictionary dictionaryWithObjects:objects forKeys:keys];
NSURL *theURL = [NSURL URLWithString:@"http://url.com/request.php"];
NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:theURL cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:10.0f];
[theRequest setHTTPMethod:@"POST"];
[theRequest setValue:@"application/json-rpc" forHTTPHeaderField:@"Content-Type"];
NSString *theBodyString = [[CJSONSerializer serializer] serializeDictionary:theRequestDictionary];
NSLog(@"%@", theBodyString);
NSData *theBodyData = [theBodyString dataUsingEncoding:NSUTF8StringEncoding];
// NSLog(@"%@", theBodyData);
[theRequest setHTTPBody:theBodyData];
NSURLResponse *theResponse = NULL;
NSError *theError = NULL;
NSData *theResponseData = [NSURLConnection sendSynchronousRequest:theRequest returningResponse:&theResponse error:&theError];
NSString *theResponseString = [[[NSString alloc] initWithData:theResponseData encoding:NSUTF8StringEncoding] autorelease];
NSLog(theResponseString);
NSDictionary *theResponseDictionary = [[CJSONDeserializer deserializer] deserialize:theResponseString];
NSLog(@"%@", theResponseDictionary);
NSString *theGreeting = [theResponseDictionary objectForKey:@"greeting"];
[self setValue:theGreeting forKey:@"greeting"];

Answer 2

不确定你的问题到底是什么。但是谷歌"TouchJSON"应该可以帮助您入门。

Answer 3

很抱歉出现错误和内存泄漏，但像这样的东西怎么样

CFURLRef url = CFURLCreateWithString(NULL, CFSTR("http://example.com/post"), NULL);
CFHTTPMessageRef msg = CFHTTPMessageCreateRequest(
    NULL,
    CFSTR("POST"),
    url,
    kCFHTTPVersion1_1);
const char *body = "key=value&id=30293";
CFDataRef bodyData = CFDataCreate(NULL, body, strlen(body));
CFHTTPMessageSetBody(msg, bodyData);
CFReadStreamRef myReadStream = CFReadStreamCreateForHTTPRequest(NULL, myRequest);
CFReadStreamOpen(myReadStream);
CFHTTPMessageRef myResponse = CFReadStreamCopyProperty(
    myReadStream,
    kCFStreamPropertyHTTPResponseHeader);
//
// Handle myResponse
//
CFReadStreamClose(myReadStream);
CFRelease(myReadStream);
CFRelease(bodyData);
CFRelease(msg);
CFRelease(url);