Shoutbox

Disable name mangling and it will work. This has nothing to do with DllMain.

quote:

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Originally posted by vikke
It is mangled. Click F10 in Dependency Walker to unmangle all function names

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That screenshot is after I'd told it to "undecorate functions" which is what F10 does... Do I have to do something differently?

Dependency Walker does undecorate these functions (for viewing only). The DLL is not changed, and you have to change your compiler options so it won't decorate your export functions.

Your function should be declared something like this

code:

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int WINAPI sum (int n1, int n2)
{
    return n1+n2;
}

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Do not use any form of C++ style dll exporting ( DECLSPEC_EXPORT ) as this is for C++ only. If you want to use the function in VB, the function needs to be exported by name only.

in your def file, you should have something like

code:

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LIBRARY "functions"
DESCRIPTION "Some description here"
EXPORTS
    ;Explicit exports go here
    sum

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If this still doesn't work, make sure that your def file has the same name as the project.

You can use delcspec(dllexport), so long as you also use extern "C". extern "C" disables name mangling for that function.

Ok, I've fixed it now. I needed to re-add the def file once I opened my workspace so I think it was including the file for some reason... Works in VB now at least. All I have to do now is learn C++

quote:

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Originally posted by RaceProUK
You can use delcspec(dllexport), so long as you also use extern "C". extern "C" disables name mangling for that function.

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The trouble with using __declspec(dllexport) with extern "C" is that the function must be __cdecl in order for the symbol to export without any decoration. Why is this a problem? VB requires dll import functions to be __stdcall

I always thought extern "C" turned off the decoration completely. After all, __stdcall is merely a calling convention.

quote:

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Originally posted by TheStevethe function must be __cdecl in order for the symbol to export without any decoration.

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I don't see why. You can write C programs that export functions with __stdcall calling conventions.