c++ - 为什么一个 HANDLE 不适用于 WriteConsoleInput，但适用于 WriteFile？

Question

所以我试图修改 Microsoft ( here ) 提供的代码以使用 WriteConsoleInput，而不是 WriteFile，但它说句柄无效(我敢打赌这真的很愚蠢)，比如句柄如何最初是创建的或其他东西。

那么我的问题是，WriteConsoleInput 所需的句柄与 WriteFile 所需的句柄之间有什么区别？

WriteConsoleInput

WriteFile

与 CreateProcess/CreatePipe/DuplicateHandle 进程创建的继承句柄相比，我猜它与 CreateFile 创建的 HANDLE 的权限标志有关。

我认为如果您能看到问题会更容易，所以这里是我的完整解决方案(使用 Visual Studio 2012)包括子应用程序和父应用程序。

ConsoleRedir on GitHub

请注意，我需要子应用程序才能使用 ReadConsoleInput，这一直是我沮丧的根源。

原始方法:

/////////////////////////////////////////////////////////////////////// 
// GetAndSendInputThreadOrig
// Thread procedure that monitors the console for input and sends input
// to the child process through the input pipe.
// This thread ends when the child application exits.
// Original from http://support.microsoft.com/kb/190351
/////////////////////////////////////////////////////////////////////// 
DWORD WINAPI GetAndSendInputThreadOrig(LPVOID lpvThreadParam)
{
    CHAR read_buff[256];
    DWORD nBytesRead,nBytesWrote;
    HANDLE hPipeWrite = (HANDLE)lpvThreadParam;

    // Get input from our console and send it to child through the pipe.
    while (bRunThread)
    {
        if(!ReadConsole(hStdIn,read_buff,1,&nBytesRead,NULL))
            DisplayError("ReadConsole");

        read_buff[nBytesRead] = '\0'; // Follow input with a NULL.

        if (!WriteFile(hPipeWrite,read_buff,nBytesRead,&nBytesWrote,NULL))
        {
            if (GetLastError() == ERROR_NO_DATA)
                break; // Pipe was closed (normal exit path).
            else
                DisplayError("WriteFile");
        }
    }

    return 1;
}

我的修改版本(必须构建击键):

/////////////////////////////////////////////////////////////////////// 
// GetAndSendInputThread
// Thread procedure that monitors the console for input and sends input
// to the child process through the input pipe.
// This thread ends when the child application exits.
/////////////////////////////////////////////////////////////////////// 
DWORD WINAPI GetAndSendInputThread(LPVOID lpvThreadParam)
{
    CHAR read_buff[256];
    DWORD nBytesWrote;
    HANDLE hPipeWrite = (HANDLE)lpvThreadParam;

    // Get input from our console and send it to child through the pipe.
    while (bRunThread)
    {
        INPUT_RECORD inputRecords[4];
        // Build a keyboard event, press '?' and then press RETURN
        inputRecords[0].EventType = KEY_EVENT;
        inputRecords[0].Event.KeyEvent.bKeyDown = TRUE;
        inputRecords[0].Event.KeyEvent.uChar.UnicodeChar = '?';
        inputRecords[1].EventType = KEY_EVENT;
        inputRecords[1].Event.KeyEvent.bKeyDown = FALSE;
        inputRecords[1].Event.KeyEvent.uChar.UnicodeChar = '?';
        inputRecords[2].EventType = KEY_EVENT;
        inputRecords[2].Event.KeyEvent.bKeyDown = TRUE;
        inputRecords[2].Event.KeyEvent.dwControlKeyState = 0;
        inputRecords[2].Event.KeyEvent.uChar.UnicodeChar = '\r';
        inputRecords[2].Event.KeyEvent.wRepeatCount = 1;
        inputRecords[2].Event.KeyEvent.wVirtualKeyCode = VK_RETURN;
        inputRecords[2].Event.KeyEvent.wVirtualScanCode = MapVirtualKey(VK_RETURN, MAPVK_VK_TO_VSC);
        inputRecords[3].EventType = KEY_EVENT;
        inputRecords[3].Event.KeyEvent.bKeyDown = FALSE;
        inputRecords[3].Event.KeyEvent.dwControlKeyState = 0;
        inputRecords[3].Event.KeyEvent.uChar.UnicodeChar = '\r';
        inputRecords[3].Event.KeyEvent.wRepeatCount = 1;
        inputRecords[3].Event.KeyEvent.wVirtualKeyCode = VK_RETURN;
        inputRecords[3].Event.KeyEvent.wVirtualScanCode = MapVirtualKey(VK_RETURN, MAPVK_VK_TO_VSC);


        if (!WriteConsoleInput(hPipeWrite,inputRecords,sizeof(inputRecords) / sizeof(*inputRecords),&nBytesWrote))
        {
            if (GetLastError() == ERROR_NO_DATA)
                break; // Pipe was closed (normal exit path).
            else
                DisplayError("WriteConsoleInput");
        }
    }

    return 1;
}

Answer 1

WriteConsoleInput 要求句柄是“控制台输入缓冲区的句柄”。 (您问题中链接页面中 handle 输入参数描述中的第一句话)。

您需要使用 GetStdHandle 中的句柄以获得合适的 handle 。

WriteConsoleInput 仅适用于控制台的直接句柄，不适用于重定向管道或类似设备。