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我正在构建的 iPhone 应用程序有问题。应用程序向 python 服务器发送 JSON 请求，然后从服务器读取 JSON 响应。我有以下函数将数据发送到服务器并获取响应并将其放入 NSData。（我把帖子的服务器地址拿出来了）

+(NSData *)accessServer:(NSMutableDictionary *) dic needResponse:(BOOL) response
{
    // Conect to the server
    CFReadStreamRef readStream;
    CFWriteStreamRef writeStream;
    CFStringRef remoteHost = CFSTR("");
    CFStreamCreatePairWithSocketToHost(NULL, remoteHost, 5687, &readStream, &writeStream);
    CFWriteStreamOpen(writeStream);
    CFReadStreamOpen(readStream);

    // send data
    NSData *json = [NSJSONSerialization dataWithJSONObject:dic options:0 error:nil];
    NSString *jsonString = [[NSString alloc]initWithData:json encoding:NSUTF8StringEncoding];
    jsonString = [NSString stringWithFormat:@"%@%@", jsonString, @"\r\n\r\n"];
    UInt8 *writeBuf = (UInt8 *)[jsonString UTF8String];
    int writtenBytes = 0;
    int bytesToSend = (int)[jsonString lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
    while(writtenBytes < bytesToSend)
    {
        writtenBytes += CFWriteStreamWrite(writeStream, writeBuf, bytesToSend-writtenBytes);
    }
    NSLog(@"Done sending, Sent :%d Total: %d",writtenBytes,bytesToSend);
    CFWriteStreamClose(writeStream);
    if(response)
    {
        // get the return data
        uint8_t readData[10000];
        int readBytes = 1;
        int totalRead = 0;
        while(readBytes > 0)
        {
            readBytes = (int)CFReadStreamRead(readStream, readData, 10000);
            totalRead += readBytes;
        }
        CFReadStreamClose(readStream);
        return [[NSData alloc]initWithBytes:readData length:totalRead];
    }
    else
    {
        CFReadStreamClose(readStream);
        return nil;
    }
}

问题是，当我尝试获取 NSData 并将其转换为 NSString 时，它的长度为 0，而 NSData 的长度> 0。以下代码是我如何获取 NSData 并将其转换为 NSString。

NSData *t = [Globals accessServer:getLocationData needResponse:TRUE];
NSString *tempString = [[NSString alloc]initWithData:t encoding:NSUTF8StringEncoding];

这个问题似乎发生在大约 10% 的时间里。有时它不会发生一个小时，有时它会连续发生 10 次。感谢您提供任何帮助，如果您需要我可能忘记提供的更多信息，请告诉我。

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