Question

我想通过蓝牙将一些字符串数据从我的Android设备传输到我的Windows笔记本电脑。使用Microsoft提供的winsock2使用蓝牙代码示例我能够使用以下代码传输数据。不幸的是，我在我发送的字符串的开头收到一个字节顺序标记。当然，我可以简单地删除前四个字节，但这对我来说似乎有点脏。我还可以使用其他选项吗？

C ++ - 接收代码（为了更好的可读性而稍作修改 - >没有错误处理，没有评论等）

ClientSocket = accept(LocalSocket, NULL, NULL);  
BOOL bContinue = TRUE; 
pszDataBuffer = (char *)HeapAlloc(GetProcessHeap(), 
                                  HEAP_ZERO_MEMORY, 
                                  CXN_TRANSFER_DATA_LENGTH); 
pszDataBufferIndex = pszDataBuffer; 
uiTotalLengthReceived = 0; 
while ( bContinue && (uiTotalLengthReceived < CXN_TRANSFER_DATA_LENGTH) ) { 
    iLengthReceived = recv(ClientSocket, 
                           (char *)pszDataBufferIndex, 
                           (CXN_TRANSFER_DATA_LENGTH - uiTotalLengthReceived), 
                           0); 

    switch ( iLengthReceived ) { 
    case 0: // socket connection has been closed gracefully 
        bContinue = FALSE; 
        break; 

    case SOCKET_ERROR: 
        wprintf(L"=CRITICAL= | recv() call failed. WSAGetLastError=[%d]\n", WSAGetLastError()); 
        bContinue = FALSE; 
        ulRetCode = CXN_ERROR; 
        break; 

    default:  
        pszDataBufferIndex += iLengthReceived; 
        uiTotalLengthReceived += iLengthReceived; 
        break; 
    } 
} 
if ( CXN_SUCCESS == ulRetCode ) { 
    pszDataBuffer[uiTotalLengthReceived] = '\0';
    wprintf(L"*INFO* | Received following data string from remote device:\n%s\n", (wchar_t *)pszDataBuffer); 
    closesocket(ClientSocket);
    ClientSocket = INVALID_SOCKET;                  
}

用于发送的Android代码：

OutputStream socketOutpuStream = socket.getOutputStream();
socketOutputStream.write(dataString.getBytes(Charsets.UTF_16));

Answer 1

好的，我现在觉得很蠢。在同类java环境中工作多年让我完全忘记了java在使用unicodecharset作为参数调用getBytes（）时设置了字节顺序标记。在android端更改dataString.getBytes(Charsets.UTF_16)到dataString.getBytes(StandardCharsets.UTF_16LE)（windows是小端）后，一切都按预期工作。

c ++ - bluock over winsock，如何删除字节顺序标记

1 个答案: