在Objective-C中发布JSON [英] Posting JSON in Objective-C

问题描述

我今天有一个相当容易的问题。我有一个应用程序，需要以2D GPS坐标的形式将一个简单的JSON数组发送到远程服务器。该应用程序将使用CoreLocation框架来生成这些坐标。现在，我想硬编码一些样本坐标以获得正确的JSON。但是，我似乎无法在ObjC代码中正确形成JSON。

I've got a fairly easy question today. I have an app that needs to send a simple JSON array to a remote server in the form of 2D GPS coordinates. The app will use the CoreLocation framework in order to generate these coordinates. For now, I want to hard code some sample coordinates to get the JSON right. However, I cannot seem to form the JSON correctly within the ObjC code.

以下是代码：

NSMutableURLRequest *request =
[NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http:myserver/handler/index"]];
[request setHTTPMethod:@"POST"];
NSString *jsonString = @"{"
@"  \"geo\": {"
@"    \"lat\": \"37.78\","
@"    \"lon\": \"-122.40";
NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
    jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
[request setHTTPBody:jsonData];
(void)[[NSURLConnection alloc] initWithRequest:request delegate:self];

以下是服务器的预期（但未收到）：

Here is what the server is expecting (but not receiving):

{
"geo": {
    "lat": "37.78",
    "lon": "-122.40"
}

我确定这是一个简单的JSON格式问题，或者是我自己的另一个零钱移动。

I'm sure it's a simple JSON formatting issue or otherwise numskull move on my part.

任何帮助总是受到赞赏！

Any help is always appreciated!

推荐答案

你这样做很难。创建一个 NSDictionary 然后将其转换为所需的JSON数据：

You are doing this the hard way. Create an NSDictionary then convert that to the desired JSON data:

NSDictionary *dictionary = @{ @"geo" : @{ @"lat" : @"37.78", @"lon" : @"-122.40" } };
NSError *error = nil;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dictionary options:0 error:&error];
if (jsonData) {
    // process the data
} else {
    NSLog(@"Unable to serialize the data %@: %@", dictionary, error);
}

根本不需要字符串。

编辑：如果您的真实数据是一个对象数组，那么创建一个字典数组或您需要的任何结构。其余的都一样。

If your real data is an array of objects then create an array of dictionaries or whatever structure you need. The rest is the same.

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