iphone - 来自 iPhone/sim 的 Google 地理编码 API 上的状态代码 0，但在网络上运行良好(非英文字符)

Question

尝试:http://maps.googleapis.com/maps/api/geocode/json?address =Őrbottyán,匈牙利&sensor=true

在 iPhone 4 和模拟器上，

 -(void)requestFailed:(ASIHTTPRequest *)request {
   NSLog(@"geocode fail code: %d",[request responseStatusCode]);
   NSLog(@"geocoding failed: %@",[request responseString]);
}
2011-06-01 11:36:27.343 app[1174:307] geocode fail code: 0
2011-06-01 11:36:27.345 app[1174:307] geocoding failed: (null)

在浏览器中我得到:

   "results" : [
    {
    "address_components" : [
        {
           "long_name" : "Őrbottyán",
           "short_name" : "Őrbottyán",
           "types" : [ "locality", "political" ]
        },
        {
           "long_name" : "Pest",
           "short_name" : "Pest",
           "types" : [ "administrative_area_level_1", "political" ]
        },
        {
           "long_name" : "Hungary",
           "short_name" : "HU",
           "types" : [ "country", "political" ]
        }
     ],
     "formatted_address" : "Őrbottyán, Hungary",
     "geometry" : {
        "bounds" : {
           "northeast" : {
              "lat" : 47.7138950,
              "lng" : 19.34353090
           },
           "southwest" : {
              "lat" : 47.63339999999999,
              "lng" : 19.2051070
           }
        },
        "location" : {
           "lat" : 47.6846190,
           "lng" : 19.2883260
        },
        "location_type" : "APPROXIMATE",
        "viewport" : {
           "northeast" : {
              "lat" : 47.7138950,
              "lng" : 19.34353090
           },
           "southwest" : {
              "lat" : 47.63339999999999,
              "lng" : 19.2051070
           }
        }
     },
     "types" : [ "locality", "political" ]
  }

], “状态”:“确定” }

其他包含标准英文字符的请求确实可以工作并在设备上正确返回。

Answer 1

在代码中的某个时刻，您可能会使用 NSURL 类，并且:

The NSURL class will fail to create a new NSURL object if the path being passed is not well-formed—the path must comply with RFC 2396. Examples of cases that will not succeed are strings containing space characters and high-bit characters. Should creating an NSURL object fail, the creation methods return nil, which you must be prepared to handle.

在将字符串传递给 NSURL 之前，您需要使用 [NSString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding] 将“Őrbottyán”中的高位字符转换为百分比转义。当您将不兼容的字符串放入 URL 字段时，现代浏览器会默默地为您进行此转换，但在代码中您必须显式执行此转换。

<小时/>

编辑以包含下面的Quantumpotato的发现:如果“Őrbottyán”被转换为“Orbottyan”(到ASCII编码的“有损”转换)，Google map 将会做正确的事情，并且该转换可以是通过 NSData 来回执行:

NSData *data = [urlString dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *dataString = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
NSURL *url = [NSURL URLWithString:dataString];
[dataString release];

我怀疑“有损转换为 ASCII”可能不适用于所有网站，但它已经通过 Google map 进行了测试和验证，所以您已经知道了。 :-)