3 replies to this topic

[PogBender]

How do i Load and Use DLL
in C++

does it matter if its VB DLL or C++ DLL ?
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

i tried c++ DLL:



Func.cpp:

double __stdcall Squ (double & X)

{

	return (X*X);

}

FuncDef.def:

LIBRARY "Func"

EXPORTS

Func

and i added the FuncDef.def to Linker >Input


vb Side:(problem)

 בעיה.png   34.06K   7 downloads


ty :P

Edited by PogBender, 08 December 2011 - 09:41 AM.

[lespauled]

If it's VC++, this may help

How to load a dynamic link library (DLL) into a Microsoft Visual C++ 6.0 project - CodeProject

[bbqroast]

Seeing as VB and C++ are different languages it probably does...
What DLL specifically? Also check out LazyFoos installing SDL tutorials, should give you the general gist of things...

[mebob]

Are you asking how to dynamically load a DLL into your program? If so, here is an example piece of code I wrote for a friend.

#include <windows.h>

#include <iostream>


using namespace std;


//This makes the function pointers easier

typedef int (__cdecl *DLLCALL)();


int main()

{

	HINSTANCE library;

	DLLCALL testing = NULL;


	////This here loads the DLL and points the library HINSTACE to it

	library = LoadLibrary("dlltest.dll");


	////This makes sure it loaded correctly. If it did, then library shouldn't equal NULL. It will continue onward.

	if(library != NULL)

	{

		////This is the function that gets the function named "testing" out of the DLL. It "stores" it in the variable

		////I created at the top of the main function, testing.

		testing = (DLLCALL) GetProcAddress(library, "testing");


		////If the function loaded correctly, run this code.

		if(testing != NULL)

		{

			////The "testing" function i created in the DLL code just returns 100. So, this will print 100.

			cout << testing();

		}

		////Unload the library.

		FreeLibrary(library);

	}

}

It uses a simple testing DLL I wrote that contains a function named testing() that simply returns 100

Edited by mebob, 07 December 2011 - 02:26 PM.