描述:
#include <windows.h>
class ZWindow;
ZWindow* g_pWnd = NULL;
#pragma pack(push,1)
struct _WndProcThunk
{
DWORD m_mov; // mov dword ptr [esp+0x4], pThis (esp+0x4 is hWnd)
DWORD m_this;
BYTE m_jmp; // jmp WndProc
DWORD m_relproc; // 相对jmp
};
#pragma pack(pop)
//typedef void(*WNDPROC)();
class ZWindow
{
public:
HWND m_hWnd;
_WndProcThunk thunk;
//ZWindow(HWND hWnd = 0) : m_hWnd(hWnd) { }
void Init(WNDPROC proc, void* pThis)
{
thunk.m_mov = 0x042444C7; //C7 44 24 04
thunk.m_this = (DWORD)pThis;
thunk.m_jmp = 0xe9;
thunk.m_relproc = (int)proc - ((int)this+sizeof(_WndProcThunk));
FlushInstructionCache(GetCurrentProcess(), &thunk, sizeof(thunk));
}
inline BOOL ShowWindow(int nCmdShow)
{ return ::ShowWindow(m_hWnd, nCmdShow); }
inline BOOL UpdateWindow()
{ return ::UpdateWindow(m_hWnd); }
inline HDC BeginPaint(LPPAINTSTRUCT ps)
{ return ::BeginPaint(m_hWnd, ps); }
inline BOOL EndPaint(LPPAINTSTRUCT ps)
{ return ::EndPaint(m_hWnd, ps); }
inline BOOL GetClientRect(LPRECT rect)
{ return ::GetClientRect(m_hWnd, rect); }
BOOL Create(LPCTSTR szClassName, LPCTSTR szTitle, HINSTANCE hInstance,
HWND hWndParent = 0, DWORD dwStyle = WS_OVERLAPPEDWINDOW,
DWORD dwExStyle = 0, HMENU hMenu = 0, int x = CW_USEDEFAULT,
int y = CW_USEDEFAULT, int nWidth = CW_USEDEFAULT,
int nHeight = CW_USEDEFAULT)
{
m_hWnd = ::CreateWindowEx(dwExStyle, szClassName, szTitle, dwStyle,
x, y, nWidth, nHeight, hWndParent, hMenu,
hInstance, NULL);
return m_hWnd != NULL;
}
virtual LRESULT OnPaint(WPARAM wParam, LPARAM lParam)
{
HDC hDC;
PAINTSTRUCT ps;
RECT rect;
hDC = BeginPaint(&ps);
GetClientRect(&rect);
::DrawText(hDC, "Hello world", -1, &rect,
DT_CENTER | DT_VCENTER | DT_SINGLELINE);
EndPaint(&ps);
return 0;
}
virtual LRESULT OnLButtonDown(WPARAM wParam, LPARAM lParam)
{
return 0;
}
virtual LRESULT OnCreate(WPARAM wParam, LPARAM lParam)
{
return 0;
}
virtual LRESULT OnKeyDown(WPARAM wParam, LPARAM lParam)
{
return 0;
}
static LRESULT CALLBACK StartWndProc(HWND hWnd, UINT uMsg,
WPARAM wParam, LPARAM lParam)
{
ZWindow* pThis = g_pWnd ;
pThis->m_hWnd = hWnd;
pThis->Init(WindowProc, pThis);
WNDPROC pProc = (WNDPROC)&(pThis->thunk);
WNDPROC pOldProc = (WNDPROC)::SetWindowLong(hWnd, GWL_WNDPROC, (LONG)pProc);
return pProc(hWnd, uMsg, wParam, lParam);
}
static LRESULT CALLBACK WindowProc(HWND hWnd, UINT uMsg,
WPARAM wParam, LPARAM lParam)
{
ZWindow* pThis = (ZWindow*)hWnd;
pThis->ProcessWindowMessage(pThis->m_hWnd, uMsg, wParam, lParam) ;
return 0;
}
BOOL ProcessWindowMessage(HWND hWnd, UINT uMsg,
WPARAM wParam, LPARAM lParam)
{