🚀 go-pugleaf

Sean McCune wrote:

>I'm trying to write an application that accesses the screen buffers of
>console apps to read what is currently visible in the console app's window.
>The pseudo-code is below.  I know it doesn't have error checking.  The real
>code does.  I ripped out all of the extraneous stuff.
>
>At any rate, the code below works when run in the debugger.
>
>   hwnd = FindWindow( className, title );
>   GetWindowThreadProcessId( hwnd, &pid );
>   AttachConsole( pid );
>   out = GetStdHandle( STD_OUTPUT_HANDLE );
>   result = ReadConsoleOutputCharacter( out, internalBuf, length, c,
>nRead );
>
>When run in the debugger, the buffer internalBuf gets filled with the text
>from the console app's window.  When run outside the debugger, result is
>always false and the error is ERROR_INVALID_HANDLE.  

First (in case others didn't know) AttachConsole() is new to XP. If
your system is older, it might not work.

Next, make sure hwnd is not NULL.
Then make sure pidl is valid.
Then make sure AttachConsole() returns TRUE.
Then, I believe  sizeof(internalBuf) should be 2*length.
Lastly, make sure nRead is an address and not a value (usually
&nRead).