How to load dll which is win32 into x64 environment

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June 11th, 2012, 10:45 PM
AngelDES

How to load dll which is win32 into x64 environment

Hi

In VS2010, I have VC++ class in x64 enviornment, when I use
HINSTANCE hDLL = LoadLibrary(L"test.dll"); => test.dll is win32
hDll is NULL

if I use
HINSTANCE hDLL =LoadLibraryExW(L"test.dll",NULL,LOAD_LIBRARY_AS_DATAFILE_EXCLUSIVE );
hDll has value.

but when I run
FUNC Setup2004;
Setup2004 = (FUNC)GetProcAddress(hDLL, "SetUp2004");

Setup2004 is NULL.

And, test.dll run in win32 enviroment with above program is well.

So, who could give me some suggestion?

Thanks
Angel
June 11th, 2012, 11:34 PM
Paul McKenzie

Re: How to load dll which is win32 into x64 environment

Quote:

Originally Posted by AngelDES

Hi

In VS2010, I have VC++ class in x64 enviornment,

Is your application a 64-bit app? If so, you cannot load 32-bit DLL's into the address space of a 64-bit application.

If it's not a 64-bit application, then call GetLastError() to determine why the DLL does not load.

Regards,

Paul McKenzie
June 12th, 2012, 12:06 AM
AngelDES

Re: How to load dll which is win32 into x64 environment

Quote:

Originally Posted by Paul McKenzie

Is your application a 64-bit app? If so, you cannot load 32-bit DLL's into the address space of a 64-bit application.

If it's not a 64-bit application, then call GetLastError() to determine why the DLL does not load.

Regards,

Paul McKenzie

Hi Paul
Thanks to your reply.
Do you have any idea about how to load 32-bit DLL's into 64-bit app?
Because my app is 64-bit app, and I don't have this 32-bit DLL source code, so I cann't recompile this to be 64-bit.

Thanks
Angel
June 12th, 2012, 12:26 AM
Igor Vartanov

Re: How to load dll which is win32 into x64 environment

Quote:

Do you have any idea about how to load 32-bit DLL's into 64-bit app?

Modules architecture must match. To load 32-bit dll your process must be 32-bit one. I heard some people been in such a desperate situation create a 32-bit COM server wrapping their problem dlls. :)
June 12th, 2012, 12:54 AM
AngelDES

Re: How to load dll which is win32 into x64 environment

Quote:

Originally Posted by Igor Vartanov

Modules architecture must match. To load 32-bit dll your process must be 32-bit one. I heard some people been in such a desperate situation create a 32-bit COM server wrapping their problem dlls. :)

Hi Igor
Thanks to your reply.
I also heard it can use TASK class to avoid this problem, but I don't know how to use? Who does know this and could give me some suggestion?

Thanks,
Angel
June 13th, 2012, 02:30 AM
Nikitozz

Re: How to load dll which is win32 into x64 environment

Quote:

Originally Posted by Igor Vartanov

I heard some people been in such a desperate situation create a 32-bit COM server wrapping their problem dlls.

I've done this once. :) But I didn't have any other choice that time. Anyway it's ugly and awful.

Quote:

Originally Posted by AngelDES

Who does know this and could give me some suggestion?

It’s impossible to load 34-bit DLL into the 64-bit application. If you really need this 32-bit DLL is there any specific reason you want your application to be 64-bit?