C++/(MFC)stdout redirect

a.py

.cpp

CString cmd = L"C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python37-32\\python.exe a.py";
CString str;
str = RunStdoutRedirect(cmd);
AfxMessageBox(str);

CString RunStdoutRedirect(CString cmd)
{
	// stdout/stderr 리디렉션
	HANDLE hWrite;
	HANDLE hRead;
	SECURITY_ATTRIBUTES sa;
	sa.nLength = sizeof(SECURITY_ATTRIBUTES);
	sa.lpSecurityDescriptor = NULL;
	sa.bInheritHandle = TRUE;

if (!CreatePipe(&hRead, &hWrite, &sa, 0))
	{
		OutputDebugString(_T("Fail to open pipe."));
		return L"";
	}

STARTUPINFO si;
	memset(&si, 0, sizeof(STARTUPINFO));
	si.cb = sizeof(STARTUPINFO);
	si.dwFlags = STARTF_USESTDHANDLES;
	si.hStdOutput = hWrite;  // 표준출력(stdout) 리디렉션
	si.hStdError = hWrite;   // 표준에러(stderr) 리디렉션
	PROCESS_INFORMATION pi;

if (!CreateProcess(NULL, cmd.GetBuffer(0), NULL, NULL, TRUE, DETACHED_PROCESS, NULL, NULL, &si, &pi))
	{
		OutputDebugString(_T("Fail to create process."));
		return L"";
	}
	CloseHandle(hWrite);

CHAR buffer[512] = {0,};
	DWORD bytesRead = 0;
	CString strStdout;
	while (ReadFile(hRead, buffer, sizeof(buffer) - 1, &bytesRead, NULL) && bytesRead)
	{
		buffer[bytesRead] = '\0';
		strStdout = buffer;
	}
	CloseHandle(hRead);

return strStdout;
}

ABCD 1234