MFC学习小例子-屏幕抓图程序代码.doc

屏幕抓图程序代码说明：1.建立基于MFC的单文档应用程序 2增加菜单项抓图3向视图类添加变量： HDC m_hdcCompatible;/与屏幕兼容设备 HBITMAP m_hbmpScreen;/屏幕抓图的位图句柄/ Capture123View.h : CCapture123View 类的接口/#pragma onceclass CCapture123View : public CScrollViewprotected: / 仅从序列化创建CCapture123View();DECLARE_DYNCREATE(CCapture123View)/ 属性public:CCapture123Doc* GetDocument() const;/ 操作public:/ 重写public:virtual void OnDraw(CDC* pDC); / 重写以绘制该视图virtual BOOL PreCreateWindow(CREATESTRUCT& cs);protected:virtual void OnInitialUpdate(); / 构造后第一次调用virtual BOOL OnPreparePrinting(CPrintInfo* pInfo);virtual void OnBeginPrinting(CDC* pDC, CPrintInfo* pInfo);virtual void OnEndPrinting(CDC* pDC, CPrintInfo* pInfo);/ 实现public:virtual CCapture123View();#ifdef _DEBUGvirtual void AssertValid() const;virtual void Dump(CDumpContext& dc) const;#endifprotected:/ 生成的消息映射函数protected:DECLARE_MESSAGE_MAP()public:HDC m_hdcCompatible;/与屏幕兼容设备HBITMAP m_hbmpScreen;/屏幕抓图的位图句柄/菜单项抓图处理函数afx_msg void OnGrabscreen();#ifndef _DEBUG / Capture123View.cpp 中的调试版本inline CCapture123Doc* CCapture123View:GetDocument() const return reinterpret_cast(m_pDocument); #endif/ Capture123View.cpp : CCapture123View 类的实现/#include stdafx.h#include Capture123.h#include Capture123Doc.h#include Capture123View.h#ifdef _DEBUG#define new DEBUG_NEW#endif/ CCapture123ViewIMPLEMENT_DYNCREATE(CCapture123View, CScrollView)BEGIN_MESSAGE_MAP(CCapture123View, CScrollView)/ 标准打印命令ON_COMMAND(ID_FILE_PRINT, &CScrollView:OnFilePrint)ON_COMMAND(ID_FILE_PRINT_DIRECT, &CScrollView:OnFilePrint)ON_COMMAND(ID_FILE_PRINT_PREVIEW, &CScrollView:OnFilePrintPreview)ON_COMMAND(ID_GRABSCREEN, &CCapture123View:OnGrabscreen)END_MESSAGE_MAP()/ CCapture123View 构造/析构CCapture123View:CCapture123View()/ TODO: 在此处添加构造代码CCapture123View:CCapture123View()BOOL CCapture123View:PreCreateWindow(CREATESTRUCT& cs)/ TODO: 在此处通过修改/ CREATESTRUCT cs 来修改窗口类或样式return CScrollView:PreCreateWindow(cs);/ CCapture123View 绘制void CCapture123View:OnDraw(CDC* pDC)CCapture123Doc* pDoc = GetDocument();ASSERT_VALID(pDoc);if (!pDoc)return;/关键代码 SelectObject(pDC-m_hDC,m_hbmpScreen); BitBlt(pDC-m_hDC,0,0,GetSystemMetrics(SM_CXSCREEN),GetSystemMetrics(SM_CYSCREEN),m_hdcCompatible,0,0,SRCCOPY);/ TODO: 在此处为本机数据添加绘制代码void CCapture123View:OnInitialUpdate()CScrollView:OnInitialUpdate();CSize sizeTotal;/ TODO: 计算此视图的合计大小sizeTotal.cx=GetSystemMetrics(SM_CXSCREEN);sizeTotal.cy=GetSystemMetrics(SM_CYSCREEN);/*sizeTotal.cx = sizeTotal.cy = 100;*/SetScrollSizes(MM_TEXT, sizeTotal);/ CCapture123View 打印BOOL CCapture123View:OnPreparePrinting(CPrintInfo* pInfo)/ 默认准备return DoPreparePrinting(pInfo);void CCapture123View:OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)/ TODO: 添加额外的打印前进行的初始化过程void CCapture123View:OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)/ TODO: 添加打印后进行的清理过程/ CCapture123View 诊断#ifdef _DEBUGvoid CCapture123View:AssertValid() constCScrollView:AssertValid();void CCapture123View:Dump(CDumpContext& dc) constCScrollView:Dump(dc);CCapture123Doc* CCapture123View:GetDocument() const / 非调试版本是内联的ASSERT(m_pDocument-IsKindOf(RUNTIME_CLASS(CCapture123Doc);return (CCapture123Doc*)m_pDocument;#endif /_DEBUG/ CCapture123View 消息处理程序void CCapture123View:OnGrabscreen()HDC hdcScreen=:GetDC(NULL);m_hdcCompatible=CreateCompatibleDC(hdcScreen);m_hbmpScreen=CreateCompatibleBitmap(hdcScreen,GetDeviceCaps(hdcScreen,HORZRES),GetDeviceCaps(hdcScreen,VERTRES);SelectObject(m_hdcCompatible,m_hbmpScreen);BitBlt(m_hdcCompatible,0,0,GetDeviceCaps(hdcScreen,HORZRES),GetDeviceCaps(hdcScreen,VERTRES),hdcScreen,0,0,SRCCOPY);HCURSOR hCursor=GetCursor();POINT ptCursor;GetCursorPos(&ptCursor);ICONINFO IconInfo;if (GetIconInfo(hCursor,&IconInfo)ptCursor.x-=(int)IconInfo.xHotspot);ptCursor.y-=(int)IconInfo.yHotspot);if (IconInfo.hbmMask!=NULL)DeleteObject(IconI