Exception in DefWindowProcA
Paul Vriens
paul.vriens at xs4all.nl
Tue Apr 26 05:50:22 CDT 2005
Hi,
when running proces explorer (V9.0.3) and some hacks, I get an exception
in DefWindowProcA:
trace:message:SPY_EnterMessage (0x20022) DefWindowProc32:
WM_GETTEXT [000d] wp=00000100 lp=00000000
Call kernel32.WideCharToMultiByte(00000000,00000000,6b2592e0 L"Process
Explorer - Sysinternals:
www.sysinternals.com",ffffffff,00000000,00000100,00000000,00000000)
ret=61b8be5
Ret kernel32.WideCharToMultiByte() retval=00000000 ret=61b8be52
trace:seh:EXC_RtlRaiseException code=c0000005 flags=0 addr=0x61b8be5c
It somewhat boils down to this piece of code in defwnd.c:
line:754
if (wndPtr->text)
{
if (!WideCharToMultiByte( CP_ACP, 0, wndPtr->text, -1,
dest, wParam, NULL, NULL )) dest[wParam-1] = 0;
result = strlen( dest );
}
else dest[0] = '\0';
WIN_ReleasePtr( wndPtr );
dest = NULL in my case so I added some tests for this:
if (wndPtr->text)
{
if (!WideCharToMultiByte( CP_ACP, 0, wndPtr->text, -1,
dest, wParam, NULL, NULL ))
{
if (dest) dest[wParam-1] = 0;
}
if (dest) result = strlen( dest );
else result = 0;
}
This makes the GUI appear but I want to find out if the call is valid or
that we indeed should check for dest being NULL.
Any ideas?
Cheers,
Paul.
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