[RESOLVED] VC++ DLL and exporting __cpuid and __cpuidex

[sciguyryan]

Hi guys!

I need a little help here. I have experience with C++ but not in this sense. I'm trying to write a DLL that will export the above functions from a DLL file in VC++ so that I can gain access to them in C#.

I have no idea how this should be done so I'd appreciate some guidance on this issue.

Thanks!

[sciguyryan]

Actually. I think I have solved this myself - with a lot of fiddling it seems to work now.

[Hack]

Post what you did.

[sciguyryan]

Of course.

struct CPUInfo
{
    int EAX;
    int EBX;
    int ECX;
    int EDX;
};
 
extern "C" __declspec(dllexport) CPUInfo cpuID(int infoType)
{
    CPUInfo i;
 
    int results[4] = { 0, 0, 0, 0 };
 
    __try
    {
        __cpuid(results, infoType);
    }
    __except (EXCEPTION_EXECUTE_HANDLER) {}
 
    i.EAX = results[0];
    i.EBX = results[1];
    i.ECX = results[2];
    i.EDX = results[3];
 
    return i;
}

Pretty much the above. Then I created a copy of the class in C# and then called the function from the DLL via pinvoke. This is like the 3rd or 4th version of the code now that works.

I made a post about this on my blog for anyone who is interested in a little more detailed description.

Cheers.