making a dll [resolved]

[cyborg]

Hi

i want to be able to make a dll that i can use from another program to send a couple of values to and make it return some values. how do i do this?
i only know really basic c++ syntax...

[cyborg]

nm...found the answer

[sunburnt]

main.cpp

#define WIN32_LEAN_AND_MEAN
#include <windows.h>

BOOL WINAPI DllMain(HINSTANCE hInst, DWORD dwReason, LPVOID pReserved)
{
     return TRUE;
}

int WINAPI MyAddFunction(int a, int b)
{
     return a + b;
}

int WINAPI MyXorFunction(int a, int b)
{
     return a ^ b;
}

project.def

LIBRARY "My Project"
EXPORTS
    MyAddFunction @1
    MyXorFunction @2

note that I declared all the functions as WINAPI (__stdcall). If you don't, they default to _cdecl and you probably wont be able to use them from Visual Basic, if that's what you're trying to do.

[Venom555]

Can you give me a way of doing it in plain C, without including the windows header file?

[Buy2easy.com]

just wondering...is the code you posted all it takes to write a *.dll that will run in vb?

i have a question for you...

Say you wanted to write a function that would read a file a line at a time and then return the lines as an array of strings to be read in a vb program how would you need to return the variables.

I guess my question is...How do you convert a C++ string which is just an array of characters into a vb string (i am guessing it is just an easier to use array of characters but i am not sure)

Thanks ahead of time!