To redirect the standard input (STDIN) for a console application named
APP.EXE from a file named INPUT.TXT, the following syntax is used:
app < input.txt
However, the following syntax will not work when attempting to debug
this application using WinDbg with STDIN redirected:
windbg app < input.txt
To debug the application as desired, use
windbg cmd /c "app < input.txt"
This will allow WinDbg to debug whatever goes on in the cmd window. A
dialog box will be displayed that says "No symbolic Info for Debuggee."
This message refers to CMD.EXE; dismiss this dialog box. When the child
process (APP.EXE) is started, the command window will read "Stopped at
program entry point." To continue, type "g" at the command window. Note
that APP.EXE will begin executing, then you can open the source file and
This technique is also useful when debugging an application that behaves
differently when run with a debugger than it does when it is run in the