Uninteresting BHO dll 64 bit and 32 bit using regsvr32 cause 0x8002801c error

Question

I have created simple BHO with ATL using these instructions http://msdn.microsoft.com/en-us/library/bb250489(v=vs.85).aspx. I am creating both 64 bit and 32 bit dll of the dll. The problem happens when I try to to unregistered the 64 bit dll after the 32 bit version using regsvr32, I am getting 0x8002801c error. (If I try vise versa the same problem happens). I have added images to celrify.

I think it has something to do with TypeLib registration because I it does the same thing for the 64 bit and 32 bit with no difference, after registering the 32 bit i have these two keys

HKEY_CLASSES_ROOT\TypeLib{5EA5008F-7766-499D-B4B0-9A671C752333}\1.0\0\win32 default = C:\programming\vswork\testfile\test64atlcom\Debug\test64atlcom.dll

HKEY_CLASSES_ROOT\Wow6432Node\TypeLib{5EA5008F-7766-499D-B4B0-9A671C752333}\1.0\0\win32 default = C:\programming\vswork\testfile\test64atlcom\Debug\test64atlcom.dll

Why does this happens, and how can solve it?

Answer 1

The error code is TYPE_E_REGISTRYACCESS. A typical problem with VS projects is that default template does not have x64 configuration and it's copying from Win32 does not update target environment in MIDL settings.

x64 build with Win32 would load and run, however it's registration would still COM-register the type library as 32-bit and cause 32/64-bit build collision.

So, you need to make sure that type libraries in Win32 builds target 32-bit, and x64 builds have them target 64-bit environment.