Thread: Call procedure in DLL

Ok, I'm writing a generic viewer for my custom controls but I'm a little stuck ...

The problem is that I don't know how to call a function which I obtained the location of with GetProcAddress() ...

Code:

FreeLibrary(lib);
       lib = LoadLibrary(fpath);
       FARPROC InitProc = GetProcAddress(lib,"InitClass");

I gathered that was correct, but how do I now call InitProc and pass a variable (in this case it's GetModuleHandle(NULL) ...

Cheers,
Michael.

InitProc(GetModuleHandle(NULL));

gg

I tried that and got - "too many arguments to function" ..

How is InitClass declared in the DLL, and how did you declare your function pointer to it?.

gg

Oh.....you declared it as "FARPROC".
You need to declare InitProc as a pointer to a function that has the same signature (and calling convention) as InitClass.

Read up function pointers here.

Here's a basic example.

Code:

#include <iostream>
using namespace std;

int foo(int a)
{
    cout << "foo(" << a << ")" << endl;
    return 0;
}//foo

int bar(int a)
{
    cout << "bar(" << a << ")" << endl;
    return 0;
}//bar

// declare a type that can point to a function that returns int and takes a 
// single int parameter
typedef int (*fn_ptr_t)(int);

int main()
{
    fn_ptr_t fnptr = NULL;

    fnptr = foo; // "fnptr = &foo" is ok too

    fnptr(1); // calls foo(1)

    fnptr = &bar;

    fnptr(2); // calls bar(2)
	
	return 0;
}//main

gg