c++

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 提供的带有 winsock2 的蓝牙代码示例，我能够使用以下代码传输数据。不幸的是，我在发送的字符串的开头收到了一个字节顺序标记。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。我可以使用其他选项吗？

用于接收的 C++ 代码（略微修改以提高可读性 -> 无错误处理无注释等）

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] = '[=10=]';
    wprintf(L"*INFO* | Received following data string from remote device:\n%s\n", (wchar_t *)pszDataBuffer); 
    closesocket(ClientSocket);
    ClientSocket = INVALID_SOCKET;                  
}

Android-发送代码：

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

Answer 1

好吧，我现在觉得自己很傻。在同类 java 环境中工作了几年让我完全忘记了 java 在使用 unicodecharset 作为参数调用 getBytes() 时设置字节顺序标记。在 android 侧将 dataString.getBytes(Charsets.UTF_16) 更改为 dataString.getBytes(StandardCharsets.UTF_16LE)（windows 是小端）后，一切都按预期工作。

c++ - winsock 上的蓝牙，如何删除字节顺序标记

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android

bluetooth

winsock2