简单的objective-c GET请求 [英] Simple objective-c GET request

问题描述

这里的大部分信息都是指废弃的ASIHTTPREQUEST项目，所以请原谅我再次提出要求。

实际上，我需要刷磁条并发送轨道2数据到一个返回登记或notenrolled（取决于卡的状态...）的web服务。

所以我的数据简单地表示为

  NSData * data = [通知对象]; 
  

然后我需要将这个传递给一个url到

$ b $的顺序b

http://example.com/CardSwipe。 cfc？method = isenrolled& track2 = data

然后只收到一个响应字符串...

我搜索了一大堆，似乎有一些矛盾的答案，应该只用AFNetworking，RESTkit还是使用本地NSURL / NSMutableURLRequest协议完成。

解决方案

在Objective-C中执行HTTP请求的选项可能有点吓人。对我来说一个很好的解决方案是使用 NSMutableURLRequest 。一个例子（使用ARC，所以YMMV）是：

$ p $ - （NSString *）getDataFrom：（NSString *）url {
NSMutableURLRequest * request = [[NSMutableURLRequest alloc] init];
[request setHTTPMethod：@GET];
[request setURL：[NSURL URLWithString：url]];

NSError * error = nil;
NSHTTPURLResponse * responseCode = nil;

NSData * oResponseData = [NSURLConnection sendSynchronousRequest：request returningResponse：& responseCode error：& error]; （[responseCode statusCode]！= 200）{
NSLog（@Error％@，HTTP status code％i，url，[responseCode statusCode]）;


返回零;
}

return [[NSString alloc] initWithData：oResponseData encoding：NSUTF8StringEncoding];
}


更新： b

您的问题的标题和标记说POST，但您的示例URL将指示GET请求。在GET请求的情况下，上面的例子就足够了。对于POST，您可以按如下方式进行更改：

   - （NSString *）getDataFrom：（NSString *）url withBody ：（NSData *）body {
 NSMutableURLRequest * request = [[NSMutableURLRequest alloc] init]; 
 [request setHTTPMethod：@POST]; 
 [request setHTTPBody：body]; 
 [请求setValue：[NSString stringWithFormat：@％d，[body length]] forHTTPHeaderField：@Content-Length]; 
 [request setURL：[NSURL URLWithString：url]]; 
 
 / *与上述相同* / 
} 
  

Most of the information here refers to the abandoned ASIHTTPREQUEST project so forgive me for asking again.

Effectively, I need to swipe a magnetic strip and send the track 2 data to a webservice that returns "enrolled" or "notenrolled" (depending on the status of the card...)

So my data comes in simply as

NSData *data = [notification object];

And then I need to pass this to a url to the order of

http://example.com/CardSwipe.cfc?method=isenrolled&track2=data

And then just receive a response string...

I've searched a ton and there seems to be some conflicting answers as to whether this should be accomplished simply with AFNetworking, RESTkit, or with the native NSURL/NSMutableURLRequest protocols.

解决方案

The options for performing HTTP requests in Objective-C can be a little intimidating. One solution that has worked well for me is to use NSMutableURLRequest. An example (using ARC, so YMMV) is:

- (NSString *) getDataFrom:(NSString *)url{
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setHTTPMethod:@"GET"];
    [request setURL:[NSURL URLWithString:url]];

    NSError *error = nil;
    NSHTTPURLResponse *responseCode = nil;

    NSData *oResponseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&responseCode error:&error];

    if([responseCode statusCode] != 200){
        NSLog(@"Error getting %@, HTTP status code %i", url, [responseCode statusCode]);
        return nil;
    }

    return [[NSString alloc] initWithData:oResponseData encoding:NSUTF8StringEncoding]; 
}

Update:

Your question's title, and tagging say POST, but your example URL would indicate a GET request. In the case of a GET request, the above example is sufficient. For a POST, you'd change it up as follows:

- (NSString *) getDataFrom:(NSString *)url withBody:(NSData *)body{
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody:body];
    [request setValue:[NSString stringWithFormat:@"%d", [body length]] forHTTPHeaderField:@"Content-Length"];
    [request setURL:[NSURL URLWithString:url]];

    /* the same as above from here out */ 
}

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