hoge.cpp

#define UNICODE
#include <windows.h>
#include <stdio.h>

DWORD OldProtect;


void Proto2(DWORD *Addr)
{
	MessageBoxW(0, L"", L"Proto", MB_OK);
}

void Sub2()
{
	MessageBoxW(0, L"", L"Callback", MB_OK);
}

void StarteHook()
{

	DWORD* dwProc = (DWORD*)Proto2;

	if (VirtualProtect(dwProc, 8, PAGE_EXECUTE_READWRITE, &OldProtect))
	{
		DWORD** tmp = &dwProc;
		BYTE b1 = 0xFF505958;
		memcpy(tmp, &b1, 4);
		tmp++;
		BYTE b2 = 0xE1;
		memcpy(tmp, &b2, 1);
	}
	DWORD* t = (DWORD*)Sub2;
	Proto2(t);

}


int CALLBACK WinMain(
	_In_ HINSTANCE hInstance,
	_In_ HINSTANCE hPrevInstance,
	_In_ LPSTR     lpCmdLine,
	_In_ int       nCmdShow
	)
{

	StarteHook();
	MessageBoxA(0, "", "hoge", MB_OK);
	return 0;

}