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LRESULT CALLBACK NewWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	switch (uMsg)
	{
	}

	return OldWndProc(hwnd, uMsg, wParam, lParam);
}

error C2059: syntax error : ')'

// dllmain.cpp : Defines the entry point for the DLL application.
#include "stdafx.h"

#define EXPORT __declspec(dllexport)

LONG Proc;

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved,
					   HINSTANCE hInstance
					 )
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
	case DLL_THREAD_ATTACH:
	case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:
		break;
	}
	return TRUE;
}

EXPORT void ChangeWindowProcedure(HWND hWnd)
{
	Proc = GetWindowLong(hWnd, GCL_WNDPROC);
	LRESULT (*)(HWND,UINT,WPARAM,LPARAM) NewProc;
	SetWindowLong(hWnd, GCL_WNDPROC, NewProc);
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT Message, WPARAM wParam, LPARAM lParam)
{

	int wmId;
	HDC hdc;
	PAINTSTRUCT ps;

	CallWindowProc(WNDPROC(Proc), hWnd, Message, wParam, lParam);

	switch (Message)
	{
	case WM_COMMAND:
		wmId = LOWORD(lParam);
		switch (wmId)
		{
		case 100:
			DestroyWindow(hWnd);
			break;
		default:
			return DefWindowProc(hWnd, Message, wParam, lParam);
		}
		break;
	case WM_PAINT:
		hdc = BeginPaint(hWnd, &ps);
		EndPaint(hWnd, &ps);
		break;
	case WM_CLOSE:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hWnd, Message, wParam, lParam);
	}
	return 0;

}

LRESULT (CALLBACK * OldProc)(HWND,UINT,WPARAM,LPARAM);

LRESULT CALLBACK WndProc(HWND hWnd, UINT Message, WPARAM wParam, LPARAM lParam);

// dllmain.cpp : Defines the entry point for the DLL application.
#include "stdafx.h"

#define EXPORT __declspec(dllexport)

LONG Proc;
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved,
					   HINSTANCE hInstance
					 )
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
	case DLL_THREAD_ATTACH:
	case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:
		break;
	}
	return TRUE;
}

EXPORT void ChangeWindowProcedure(HWND hWnd)
{
	Proc = GetWindowLong(hWnd, GCL_WNDPROC);
	SetWindowLong(hWnd, GCL_WNDPROC, LONG(WndProc));
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT Message, WPARAM wParam, LPARAM lParam)
{

	int wmId;
	HDC hdc;
	PAINTSTRUCT ps;

	CallWindowProc(WNDPROC(Proc), hWnd, Message, wParam, lParam);

	switch (Message)
	{
	case WM_COMMAND:
		wmId = LOWORD(lParam);
		switch (wmId)
		{
		case 100:
			DestroyWindow(hWnd);
			break;
		default:
			return DefWindowProc(hWnd, Message, wParam, lParam);
		}
		break;
	case WM_PAINT:
		hdc = BeginPaint(hWnd, &ps);
		EndPaint(hWnd, &ps);
		break;
	case WM_CLOSE:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hWnd, Message, wParam, lParam);
	}
	return 0;

}