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load dlls at runtime for 32 bit and 64 bit

Answer 1

+1 A:

On Windows you use IsWow64Process() function.

sharptooth 2010-10-28 11:13:23

+1. The only disadvantage of this function is that it is supported starting from Windows XP SP2. You can't use it for SP1 or clean XP.

gtikok 2010-10-28 11:20:45

@gtikok: Nobody supports pre-SP2 XP.

DeadMG 2010-10-28 11:30:14

You never know what platform is installed on customer PC :)

gtikok 2010-10-28 11:45:56

Answer 2

A:

For Windows you can use following function.

#include<Windows.h>
BOOL IsX86()
{
    char proc[9];

    GetEnvironmentVariable("PROCESSOR_ARCHITEW6432", proc, 9);

    if (lstrcmpi(proc, "AMD64") == 0)
    {
        return FALSE;
    }

    return TRUE;
}

At least it works for me.

For details please see the link:

http://blogs.msdn.com/b/david.wang/archive/2006/03/26/howto-detect-process-bitness.aspx

gtikok 2010-10-28 11:18:19

Could you please provide header files because i am getting some error

2010-10-28 11:26:17

The header is added above.

gtikok 2010-10-28 11:28:50

How about following code if(sizeof(int) == sizeof(size_t)){printf(X86);}else{printf(x64);}

2010-10-28 11:35:00

I am not sure that this will work. Please see the link below. May be it will helpful. http://stackoverflow.com/questions/918787/whats-sizeofsize-t-on-32-bit-vs-the-various-64-bit-data-models

gtikok 2010-10-28 11:44:50

If you're using TRUE and FALSE why not return a BOOL?

Jookia 2010-10-28 11:57:56

@Jookia: You are right. BOOL should be used. Corrected.

gtikok 2010-10-28 12:02:10

i set ENV32 variable in preprocess for 32bit and ENV64 for 64bit. i check the following condition #if ENV32 pritf("32bit") #elif ENV64 printf("64Bit"). Could you please which is good?

2010-10-28 12:12:24

Using #if/#endif preprocessors will decrease the size of your code. Also you have to use them if you use x64 specific code which is not compiled for x86. But you still need to take into account the case when 32-bit application is executed on x64 platform. In any case it would be better if you will provide details about what you want to do exactly.

gtikok 2010-10-28 13:08:39

Answer 3

+1 A:

Typically this is done at build time. You produce 32-bit binaries which load 32-bit DLLs and 64-bit binaries which load 64-bit DLLs.

The user then uses the setup for her platform (32-bit installer or 64-bit installer).

So there is no need to find out at runtime on which platform you are for this.

It is not possible to load 32-bit DLLs in an 64-bit Application or the other way around.

frast 2010-10-28 11:50:01

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