将变音符号从Node.js发送到iOS [英] Send umlauts from Node.js to iOS
问题描述
我不知道这是Node.js还是iOS问题,但当我尝试发送包含变音符号(ä,ö和ü)的JSON对象时内容长度似乎是错误的。
I don't know if this is a Node.js or an iOS problem, but when I try to send a JSON object which contains umlauts (ä, ö, and ü) the set content-length seems to be wrong.
所以这是我的设置:
我的Node.js服务器发送数据通过:
My Node.js server sends data via:
[..mongodb request..].toArray(function(err, result) {
res.setHeader('Content-Type', 'application/json');
var body = JSON.stringify(result);
console.log(body);
console.log(body.length);
res.setHeader('charset', 'utf8');
res.setHeader('Content-Length', body.length);
res.end(body);
});
这会产生以下对象:
[
{
"_id": "51da7eb5d5f9ad77302a26c6",
"loc": [
53.560994,
9.929796
],
"street": "Kühnehöfe 25",
"time": 1373273781535
},
{
"_id": "51da7eb9d5f9ad77302a26c7",
"loc": [
53.561899,
9.930203
],
"street": "Kühnehöfe 17",
"time": 1373273785156
}
]
其中(已解析为字符串)长度为215.这也是设置为内容长度。
Which has (parsed as string) a length of 215. This is also set as the content length.
在我的iOS项目中,我有以下设置:
In my iOS project I've got following setup:
-(void)serverRequest {
// Initialize new mutable data
NSMutableData *data = [[NSMutableData alloc] init];
self.receivedData = data;
// Initialize URL that is going to be fetched.
NSURL *url = [NSURL URLWithString:@"http://localhost:8000/getSpots"];
// Initialize a request from a URL
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[url standardizedURL]];
// Set HTTP method
[request setHTTPMethod:@"POST"];
// Initialize post data
NSDictionary* jsonDict = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:coordinate.latitude], @"lat", [NSNumber numberWithFloat:coordinate.longitude], @"lng", accessToken, @"accessToken", nil];//dictionaryWithObjectsAndKeys:coord.latitude, nil]
NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:jsonDict
options:NSJSONWritingPrettyPrinted // Pass 0 if you don't care about the readability of the generated string
error:&error];
// Set request content type we MUST set this value.
[request setValue:@"application/json; charset=utf-8" forHTTPHeaderField:@"content-type"];
// Set post data of request
[request setHTTPBody:jsonData];
// Initialize a connection from request
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
self.connectionGetSpots = connection;
// Start the connection
[connection start];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
[self.receivedData appendData:data];
NSLog(@"loading: %d, %lld", [self.receivedData length], dataSize); // Both 215 (correct)
}
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
dataSize = [response expectedContentLength];
NSLog(@"dataSize: %lld", dataSize); // is 215 (correct)
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
NSString *responseData = [[NSString alloc] initWithData:self.receivedData encoding:NSUTF8StringEncoding];
NSLog(@"rD: %@, %d" ,responseData, [responseData length]);
}
connectionDidFinishLoading
函数记录下:
[
{
"_id": "51da7eb5d5f9ad77302a26c6",
"loc": [
53.560994,
9.929796
],
"street": "Kühnehöfe 25",
"time": 1373273781535
},
{
"_id": "51da7eb9d5f9ad77302a26c7",
"loc": [
53.561899,
9.930203
],
"street": "Kühnehöfe 17",
"time": 13732737851
,211
As你可以看到,JSON对象中有四个变音符号,缺少四个字符。如果我添加另一个带有两个变音符号的位置,则会丢失另外两个字符。
As you can see, there are four umlauts in the JSON object and four characters are missing. If I add another location with two umlauts, two more characters will be missing.
我猜某个地方的内容类型设置错误,但我不知道我有什么要做的事。
I guess somewhere the content type is set wrong, but I'm not sure what I have to do.
推荐答案
使用它来获得正确的UTF-8长度:
Use this for correct UTF-8 lengths:
new Buffer(body).length
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