C / C++ / MFC

// Win32.cpp : Defines the entry point for the application.
//
 
#include "stdafx.h"
#include <windows.h>
 
class CMyClass
{
private:
	void Private();
};
 
void CMyClass::Private()
{
	MessageBox(NULL, "CMyClass::Private", NULL, MB_OK);
}
 
int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
	// Type for a pointer to a member of "CMyClass" which returns and accepts nothing.
	typedef void (CMyClass::*PMyClassMemFun)();
 
	// Set the pointer from the address in the map file.
	PMyClassMemFun pFunc;
	*reinterpret_cast<ULONG_PTR*>(&pFunc) = 0x00401020; // From map file.
 
	// Instantiate the class and call the private function.
	CMyClass inst;
	(inst.*pFunc)();
 
	return 0;
}

Stephen Hewitt wrote:

*reinterpret_cast<ulong_ptr*>(&pFunc) = 0x00401020; // From map file