Is there a way to launch a DOS command and read any resulting error conditions?

I'm using the lpr command to send a pre-existing file to a printer. I'd like to verify the command properly functioned before marking the file as sent. If the command is executed from the DOS command window on a file that has a lock on it, or is not present, or whatever; then an error message is printed. I'd like to react to that error message.

I've tried using the app_apirun class, but it responds with success no matter if the file exists or not.

Thanks