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Code Snippet - C++ Virtual Table
Author:Arkon
Category:Win32API
File Size:640 Bytes
Uploaded at:27-Nov-02 03:17:47 pm
Description:
  Shows how to call a method of a class in C++ using directly the virtual pointers table of the class (Under Visual C++ 6 only).
  
// It works for VC6 implementations, didn't check in other compilers!
#include <windows.h>
class CTest
{
 public:
 virtual void bla()
 {
  MessageBox(NULL, "bla1", "CTest", 0);
 }
 virtual void bla2()
 {
  MessageBox(NULL, "bla2", "CTest", 0);
 }
 virtual void bla3()
 {
  MessageBox(NULL, "bla3", "CTest", 0);
 }
};

typedef (*lpfunc)(void* thisptr);
lpfunc func;

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
 CTest* ct = new CTest;
 DWORD *pvtbl = (DWORD*)ct;
 DWORD *vtbl = (DWORD*)*pvtbl;
 func = (lpfunc)vtbl[1];
 func(ct);
 delete ct;
 return 0;
}
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