// TestTrunk.cpp : 定义应用程序的入口点。
//

#include "stdafx.h"
#include "TestTrunk.h"

#define MAX_LOADSTRING 100


#pragma pack(push,1)
typedef struct _StdCallThunk
{
	DWORD   m_mov;          // = 0x042444C7
	DWORD   m_this;         // = this
	BYTE    m_jmp;          // = 0xe9
	DWORD   m_relproc;      // = relative distance
} StdCallThunk;
#pragma pack(pop)
class CMyWindow
{
public:
	CMyWindow():_hwnd(NULL){}
	~CMyWindow(){VirtualFree(_pStdthunk, sizeof(StdCallThunk), MEM_RELEASE);}
	bool Create();


protected:
	LRESULT CALLBACK WndProc(UINT message, WPARAM wParam, LPARAM lParam);
	MSG _msg;
	HWND _hwnd;
	StdCallThunk *_pStdthunk;
	static LRESULT CALLBACK TempWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
	static LRESULT CALLBACK StaticWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);

};

bool CMyWindow::Create()
{
	WNDCLASSEX wcex;
	LPCTSTR lpszClassName = _T("ClassName");
	wcex.cbSize = sizeof(WNDCLASSEX);
	wcex.style			= CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc	= CMyWindow::TempWndProc;
	wcex.cbClsExtra		= 0;
	wcex.cbWndExtra		= 0;
	wcex.hInstance		= GetModuleHandle(NULL);
	wcex.hIcon			= LoadIcon(GetModuleHandle(NULL), MAKEINTRESOURCE(IDI_TESTTRUNK));
	wcex.hCursor		= LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground	= (HBRUSH)(COLOR_WINDOW+1);
	wcex.lpszMenuName	= MAKEINTRESOURCE(IDC_TESTTRUNK);
	wcex.lpszClassName	= lpszClassName;
	wcex.hIconSm		= LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

	RegisterClassEx(&wcex);

	_pStdthunk = (StdCallThunk *)VirtualAlloc(NULL, sizeof(StdCallThunk), MEM_RESERVE | MEM_COMMIT, PAGE_EXECUTE_READWRITE);
	_pStdthunk->m_mov = 0x042444c7;
	_pStdthunk->m_jmp = 0xe9;

	//CreateWindow的最后一个参数为this指针
	CreateWindow(lpszClassName, NULL, WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, GetModuleHandle(NULL),this);

	if (_hwnd == NULL)
	{
		MessageBox(NULL,TEXT("Error"),NULL,NULL);
		return FALSE;
	}

	ShowWindow(_hwnd, SW_SHOW);
	UpdateWindow(_hwnd);

	return TRUE;
}

LRESULT CALLBACK CMyWindow::TempWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	if (message == WM_CREATE)//此处使用WM_NCCREATE消息也可以
	{
		//提取出对象指针
		CMyWindow *w = NULL;
		w = (CMyWindow*)((LPCREATESTRUCT)lParam)->lpCreateParams;
		w->_hwnd = hWnd;
		WNDPROC pWndProc = (WNDPROC)w->_pStdthunk;
		w->_pStdthunk->m_this = (DWORD)w;

		//计算跳转位置
		w->_pStdthunk->m_relproc = (DWORD)&CMyWindow::StaticWndProc - ((DWORD)w->_pStdthunk + sizeof(StdCallThunk));

		SetWindowLong(hWnd, GWL_WNDPROC, (LONG)pWndProc);
		return pWndProc( hWnd,  message, wParam, lParam);
	}
	return DefWindowProc(hWnd, message, wParam, lParam);
}

LRESULT CALLBACK CMyWindow::StaticWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	return ((CMyWindow *)hWnd)->WndProc(message, wParam,  lParam);
}

LRESULT CALLBACK CMyWindow::WndProc(UINT message, WPARAM wParam, LPARAM lParam)
{
	int wmId, wmEvent;
	PAINTSTRUCT ps;
	HDC hdc;
	switch (message)
	{

	case WM_COMMAND:
		wmId    = LOWORD(wParam);
		wmEvent = HIWORD(wParam);
		// 分析菜单选择:
		switch (wmId)
		{
		case IDM_ABOUT:
			MessageBox(NULL,TEXT("AboutDlg"),TEXT("关于"),NULL);
			break;
		case IDM_EXIT:
			DestroyWindow(_hwnd);
			break;
		}
		break;
	case WM_PAINT:
		hdc = BeginPaint(_hwnd, &ps);
		// TODO: 在此添加任意绘图代码...
		EndPaint(_hwnd, &ps);
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;

	default:
		return DefWindowProc(_hwnd, message, wParam, lParam);
		break;
	}
	return TRUE;
}

int APIENTRY _tWinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPTSTR    lpCmdLine,
                     int       nCmdShow)
{
	UNREFERENCED_PARAMETER(hPrevInstance);
	UNREFERENCED_PARAMETER(lpCmdLine);

	CMyWindow pMyWindow;
	pMyWindow.Create();
	MSG msg;
	HACCEL hAccelTable =  LoadAccelerators(GetModuleHandle(NULL), MAKEINTRESOURCE(IDC_TESTTRUNK));
	while (GetMessage(&msg, NULL, 0, 0))
	{
		if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}
	return 0;
}

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