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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