我想我找到了解决办法

void UserPause(void)
{
  printf("Press any key to continue\n");  // Print message to user
  while (!_kbhit())  // Loop while the keyboard is not hit
  {

    if (b_TesterPresentEnabled == 1)  
    // Only do tester present if functionality is enabled
    {
        TestTXMsg[0] = 0x3e;  // Set up the message bytes
        TestTXMsg[1] = 0x00;
        TxMsgLen = 2;  // Define the message length
        MsgTest();  // Function to send the message to the ECU
        Sleep(4000);
    }
  }
}