因此,我试图修改Microsoft(here)提供的代码以使用WriteConsoleInput而不是WriteFile,但是它说该句柄无效(我敢打赌这确实很愚蠢),例如最初创建该句柄的方式等。

所以我的问题是,WriteConsoleInput和WriteFile的句柄之间有什么区别?

WriteConsoleInput

WriteFile

我猜想这与CreateFile / CreatePipe / DuplicateHandle流程创建的继承句柄相比,CreateFile创建的HANDLE的权限标志影响很大。

我认为,如果您可以看到此问题,它将变得更加容易,因此这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

需要说明的是,我需要子应用程序使用ReadConsoleInput,这是我感到沮丧的原因。

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(必须建立按键):
///////////////////////////////////////////////////////////////////////
// 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;
}

最佳答案

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

您需要使用 GetStdHandle 中的句柄来获取合适的句柄。
WriteConsoleInput仅在控制台的直接句柄上起作用,而不在重定向的管道或类似控件上起作用。

关于c++ - 为什么一个HANDLE不适用于WriteConsoleInput,但适用于WriteFile?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/17650336/

10-11 18:46