I am still trying to resolve the problem I described in this thread where I basically have a DLL written in native C and want to develop a wrapper function for it and call the C functions from within a C++ application. The solution described in that thread works, but it requires me to modify my original C DLL's files (which I don't want to because I have a lot of them, and not all of them compile on Windows), so I am trying to find a way that allows me to make direct calls to the functions of the DLL without having to dllexport/import...etc.
I found this and I thought I could try it out. I did basically the same thing as before.
My DLL is coded as follows
#include "addition.h"
#include <stdio.h>
int add(int x, int y){
return x+y;
}My wrapper project, hereafter I'm calling it MyProject consists of just MyProject.cpp:
#include <Windows.h>
#include <iostream>
using namespace std;
int CallMyDLL(void)
{
/* get handle to dll */
HINSTANCE hGetProcIDDLL = LoadLibrary("C:\\AdditionDLL.dll");
/* get pointer to the function in the dll*/
FARPROC lpfnGetProcessID = GetProcAddress(HMODULE (hGetProcIDDLL),"add");
/*
Define the Function in the DLL for reuse. This is just prototyping the dll's function.
A mock of it. Use "stdcall" for maximum compatibility.
*/
typedef int (__stdcall * pICFUNC)(int, int);
pICFUNC add;
add = pICFUNC(lpfnGetProcessID);
/* The actual call to the function contained in the dll */
int intMyReturnVal = add(4, 5);
/* Release the Dll */
FreeLibrary(hGetProcIDDLL);
/* The return val from the dll */
returnintMyReturnVal;
}
int main(){
int res=0;
res = CallMyDLL();
cout << "The result is ";
cout << res;
}Both codes compile with no errors. I have copied and pasted the AdditionDLL.dll in the C:// directory. But when I run the program, I get Unhandled exception access violation. What's the problem?
