问CreateProcess不能运行sfc.exe吗？为什么

EN

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

    HANDLE hReadPipe = NULL;
    HANDLE hWirtePipe = NULL;
    if (!CreatePipe(&hReadPipe, &hWirtePipe, &sa, NULL)) {
        std::cout << "create pipe failed \n";
        return -1;
    } 


    PROCESS_INFORMATION pi;
    STARTUPINFO si;
    ZeroMemory(&si, sizeof(STARTUPINFO));
    ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));
    si.cb = sizeof(STARTUPINFO);
    si.dwFlags = STARTF_USESHOWWINDOW|STARTF_USESTDHANDLES,
    si.wShowWindow = SW_HIDE;
    si.hStdError = hWirtePipe;
    si.hStdOutput = hWirtePipe;

    TCHAR szCommand[] = TEXT("sfc /scannow");
    if (!CreateProcess(NULL, szCommand, NULL, NULL, TRUE, CREATE_NO_WINDOW, NULL, NULL, &si, &pi)) 
    {
        cout << "process create failed ,errno is ："<< GetLastError() << endl;
        CloseHandle(hReadPipe);
        CloseHandle(hWirtePipe);
        return -1;
    }
    
    DWORD dwRead = 0;
    DWORD stdRead = 0;
    DWORD total;
    DWORD timeout = 50;
    TCHAR bufferOutPipe[1024] = {0};
    TCHAR readBuffer[1024] = {0};
    BOOL flag = true;
    while (flag) {
        if (WAIT_TIMEOUT == WaitForSingleObject(pi.hProcess, timeout)) {
            if (!PeekNamedPipe(hReadPipe, bufferOutPipe, 1024, &dwRead, &total, 0) || dwRead <= 0) {
                continue;
            }
            else {
                ReadFile(hReadPipe, readBuffer, dwRead, &stdRead, NULL);
                printf("%s\n", readBuffer);
                dwRead = 0;
            }
        }
        else if (WAIT_OBJECT_0 == WaitForSingleObject(pi.hProcess, timeout)) {
            if (PeekNamedPipe(hReadPipe, bufferOutPipe, 1024, &dwRead, &total, 0) && dwRead > 0) {

                ReadFile(hReadPipe, readBuffer, dwRead, &stdRead, NULL);
                printf("%s\n", readBuffer);
            }
            flag = false;
        }
        ZeroMemory(readBuffer, 1024);
    }
    CloseHandle(hReadPipe);
    CloseHandle(hWirtePipe);
    CloseHandle(pi.hThread);
    CloseHandle(pi.hProcess);