匿名管道重定向命令行输出

首先是MFC，注意事项：
1、管道读写是FIFO
2、读写指针，要记得关闭
3、编译时用了UNICODE，但CMD读取回来时ANSI，所以要转换一下字符集

	SECURITY_ATTRIBUTES sa;
	ZeroMemory(&sa, sizeof(sa));
	sa.nLength = sizeof(SECURITY_ATTRIBUTES);
	sa.lpSecurityDescriptor = NULL;
	sa.bInheritHandle = TRUE;

	HANDLE hRead, hWrite;
	if (!CreatePipe(&hRead, &hWrite, &sa, 0)) {
		MessageBox(L"Error On CreatePipe()");
		return;
	}

	STARTUPINFO si;
	ZeroMemory(&si, sizeof(si));
	si.cb = sizeof(STARTUPINFO);
	GetStartupInfo(&si);
	si.hStdError = hWrite;
	si.hStdOutput = hWrite;
	si.wShowWindow = SW_HIDE;
	si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
	PROCESS_INFORMATION pi;
	ZeroMemory(&pi, sizeof(pi));
	if (!::CreateProcess(L"C:\\Windows\\System32\\cmd.exe", L"/c dir /b D:\\Downloads"
		, NULL, NULL, TRUE, NULL, NULL, NULL, &si, &pi)) {
		showMeErrorInfo();	
		return;
	}
	CloseHandle(hWrite);

	char buffer[4096] = { 0 };
	DWORD bytesRead;
	while (true) {
		if (ReadFile(hRead, buffer, 4095, &bytesRead, NULL) == NULL)
		{
			break;
		}
		
		UINT CodePage = 0;
		DWORD dwNum;
		dwNum = MultiByteToWideChar(CodePage, 0, buffer, -1, NULL, 0);
		if (dwNum)
		{
			wchar_t *pwText;
			pwText = new TCHAR[dwNum];
			if (pwText)
			{
				MultiByteToWideChar(CodePage, 0, buffer, -1, pwText, dwNum);
			}
			//m_Edit.SetWindowText(pwText);
			delete[]pwText;
			pwText = NULL;
		}
		UpdateData(false);
		Sleep(200);
	}
	CloseHandle(hRead);

C#的话，就简单多了：

            ProcessStartInfo startInfo = new ProcessStartInfo();
            startInfo.FileName = "C:\\Windows\\System32\\cmd.exe";
            startInfo.Arguments = "/c dir /b D:\\Downloads";
            startInfo.RedirectStandardOutput = true;
            //startInfo.RedirectStandardError = true;
            startInfo.UseShellExecute = false;
            startInfo.CreateNoWindow = false;
           
            Process p=Process.Start(startInfo);

            String cmdOut = "";
            while(!p.HasExited)
            { 
                cmdOut = p.StandardOutput.ReadLine();
                textBox1.Text += cmdOut + "\r\n";
                p.WaitForExit(10);
            }
            cmdOut = p.StandardOutput.ReadToEnd() + "\r\n";
            textBox1.Text += cmdOut ;