二、编程步骤
1、 启动Visual C++6.0，生成一个Win32应用程序，将该程序命名为"transparent"；
2、 使用Class Wizard在应用程序中添加CMyWnd类，其基类选择CWnd；
3、 向应用程序的项目中添加背景位图和掩模位图，其ID分别设置为IDB_SHOW、IDB_MASK；
4、 添加代码，编译运行程序。
三、程序代码
//////////////////////////////////////////////////////////////// MyWnd.h : header file
#if !defined(AFX_MYWND_H__A761190E_CDF2_4A56_8848_AEE5AC7AD160__INCLUDED_)
#define AFX_MYWND_H__A761190E_CDF2_4A56_8848_AEE5AC7AD160__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// CMyWnd window
class CMyWnd : public CWnd
{
// Construction
public:
CMyWnd();
// Attributes
public:
// Operations
public:
// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CMyWnd)
//}}AFX_VIRTUAL
// Implementation
public:
void Initialize(LPCTSTR lpszName,CRect &rectWnd,UINT nMaskId,UINT nShowId);
void Display(CDC *pDC,UINT nMaskId);
virtual ~CMyWnd();
// Generated message map functions
protected:
//{{AFX_MSG(CMyWnd)
afx_msg BOOL OnEraseBkgnd(CDC* pDC);
afx_msg UINT OnNcHitTest(CPoint point);
afx_msg void OnChar(UINT nChar, UINT nRepCnt, UINT nFlags);
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
private:
UINT m_nBitmapId;
};
//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.
#endif // !defined(AFX_MYWND_H__A761190E_CDF2_4A56_8848_AEE5AC7AD160__INCLUDED_)
////////////////////////////////////////////////////////// MyWnd.cpp : implementation file
#include "stdafx.h"
#include "transparent.h"
#include "MyWnd.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
// CMyWnd
CMyWnd::CMyWnd()
{}
CMyWnd::~CMyWnd()
{}
BEGIN_MESSAGE_MAP(CMyWnd, CWnd)
//{{AFX_MSG_MAP(CMyWnd)
ON_WM_ERASEBKGND()
ON_WM_NCHITTEST()
ON_WM_CHAR()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
BOOL CMyWnd::OnEraseBkgnd(CDC* pDC)
{
// TODO: Add your message handler code here and/or call default
CRect rectWnd;
this->GetWindowRect(&rectWnd);
CDC memDC;
CBitmap myBitmap,*pOldBitmap;
myBitmap.LoadBitmap(m_nBitmapId);
memDC.CreateCompatibleDC(pDC);
pOldBitmap = memDC.SelectObject(&myBitmap);
pDC->BitBlt(0,0,rectWnd.Width(),rectWnd.Height(), &memDC,0,0,SRCCOPY);
// 将设备还原
memDC.SelectObject(pOldBitmap );
return TRUE;
}
UINT CMyWnd::OnNcHitTest(CPoint point)
{
// TODO: Add your message handler code here and/or call default
UINT nHitTest = CWnd :: OnNcHitTest(point) ;
return (nHitTest == HTCLIENT) ? HTCAPTION : nHitTest ;
}
void CMyWnd::Display(CDC *pDC, UINT nMaskId)
{
// 获得窗体矩形
CRect rectWnd;
this->GetWindowRect(rectWnd);
// 读取位图资源
CBitmap myBitmap,*pOldBitmap;
myBitmap.LoadBitmap(nMaskId);
// 创建"内存一致"设备
CDC memDC;
memDC.CreateCompatibleDC(pDC);
//选择绘图设备
pOldBitmap = memDC.SelectObject(&myBitmap);
// 创建窗体的初始区域
CRgn rgnWnd,rgnTemp;
rgnWnd.CreateRectRgn(0,0,rectWnd.Width(),rectWnd.Height());
int nWidth,nHeight;
COLORREF color;
for (nWidth = 0;nWidth <= rectWnd.Width()-1;nWidth++)
{
for (nHeight = 0;nHeight <= rectWnd.Height();nHeight++)
{
color = memDC.GetPixel(nWidth,nHeight);
// 当象素是白色时，去掉该点
if (color == RGB(255,255,255))
{
rgnTemp.CreateRectRgn(nWidth,nHeight,nWidth+1,nHeight+1);
rgnWnd.CombineRgn(&rgnWnd,&rgnTemp,RGN_XOR);
rgnTemp.DeleteObject();
}
}
}
memDC.SelectObject(pOldBitmap);
SetWindowRgn((HRGN)rgnWnd,TRUE);
}
void CMyWnd::Initialize(LPCTSTR lpszName, CRect &rectWnd, UINT nMaskId, UINT nShowId)
{
this->CreateEx(0,AfxRegisterWndClass(0),lpszName,WS_POPUP
| WS_SYSMENU,rectWnd,NULL,NULL,NULL);
this->Display(GetWindowDC(),nMaskId);
m_nBitmapId = nShowId;
}
void CMyWnd::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
// TODO: Add your message handler code here and/or call default
if(nChar==VK_ESCAPE)
{
PostMessage(WM_QUIT);
}
CWnd::OnChar(nChar, nRepCnt, nFlags);
}
////////////////////////////////////////////////////////////
BOOL CTransparentApp::InitInstance()
{
#ifdef _AFXDLL
Enable3dControls(); // Call this when using MFC in a shared DLL
#else
Enable3dControlsStatic(); // Call this when linking to MFC statically
#endif
m_pMainWnd = &m_wndMain;// m_wndMain是CmyWnd类成员变量；
CRect rectWnd(500, 300, 580, 380);
m_wndMain.Initialize(_T("loveghost"),rectWnd,IDB_MASK,IDB_SHOW);
m_wndMain.ShowWindow(SW_SHOW); // 窗体创建完毕，显示之；
return TRUE; // 返回非零值表示要继续处理消息
} |
四、小结
这种异形窗口的创建方法适应于所有的基于CWnd类的派生窗口，采用这一方法，可以创建出任何形状的"异形"窗体。
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