所以我尝试修改 Microsoft 提供的代码( here )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),就像句柄的方式一样是最初创建的或者什么的。
所以我的问题是,WriteConsoleInput 所需的句柄和 WriteFile 所需的句柄有什么区别?
我猜测这与 CreateFile 创建的 HANDLE 的权限标志(与 CreateProcess/CreatePipe/DuplicateHandle 进程创建的继承句柄相比)有关。
我认为如果您能看到问题会更容易,所以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。
请注意,我需要子应用程序使用 ReadConsoleInput,这就是我感到沮丧的根源。
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;
}
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
输入参数描述中的第一句)。
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的管道。
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/