So basically I had set a breakpoint on a WINAPI function call. When I tried to run the program and step over the breakpoint, the program exits with the popup window: unknown exception code 6F4 (exc.code 6f4, tid 704). The function does not return any value as the program exits before that happens, so I can't tell if the function has returned a successful error code or not. What is this exception code, and why did this happen?

  • Can you try to set the same breakpoint in x64dbg or in windbg and see if there is the same exception ? Try also to use an hardware breakpoint.
    – Tony
    Feb 18, 2021 at 11:01

1 Answer 1

\>cdb -c "!error 6f4;q" cdb | awk "/Reading/,/quit/"  
0:000> cdb: Reading initial command '!error 6f4;q'   
**Error code: (Win32) 0x6f4 (1780) - A null reference pointer was passed to the stub.**  

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