KbdLayerDescriptor returns NULL at 64bit architecture

Question

im writing a complex program that analyses users writing, and i have problem when running this application on 64bit OS. Here is the code you can run to re-interprate the problem. http://thetechnofreak.com/technofreak/keylogger-visual-c/ but of course, you need to have 64bit OS, since the program runs correctly on 32bit OS.

after this call

pKbd = pKbdLayerDescriptor();

this pointer equals NULL

pKbd->pVkToWcharTable

I have tried to google the solution first, and i found this http://www.codeproject.com/Questions/211107/RegQueryValueEx-programcrash-on-64-Bit its the exact same problem as i have, but there seem not to be a solution. So do you have any ideas what can be wrong ?

There is this piece of code in the program and it seems that it takes care of the size differences between pointers on 32 and 64bit architecture

#if defined(BUILD_WOW6432)
#define KBD_LONG_POINTER __ptr64
#else
#define KBD_LONG_POINTER
#endif

But clearly, its not helping.

Are you actually using KBD_LONG_POINTER in the VK_TO_WCHAR_TABLE declaration? Required. — Hans Passant, May 01 '12 at 13:15
i used the declarations that are used in the first link i posted - kbdext.h — Anton Giertli, May 01 '12 at 13:21
The point is that you change the type of the pVkToWchars member to the 64-bit pointer. — Hans Passant, May 01 '12 at 13:24

score 1 · Answer 1 · edited Jul 20 '12 at 11:03

I've just had exactly the same issue with that piece of code.

I'll assume you're compiling to 32-bit but running on 64-bit as I am. If so, then first you need to define BUILD_WOW6432 before including kbd.h (or kbdext.h if you're using it). Secondly, use

SHGetFolderPath(NULL, CSIDL_SYSTEMX86, NULL, 0, systemDirectory)

instead of GetSystemDirectory(systemDirectory, MAX_PATH). This means that you always use the 32-bit code, even on 64-bit machines.

This solved the problem for me, hope it helps you :)

KbdLayerDescriptor returns NULL at 64bit architecture

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