用Visual C++设计屏幕抓图程序
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) { if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) { //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 SaveBmp(); return FALSE; } …… //其它处理及默认处理 } |
将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
二、编程步骤
1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
5、 添加代码,编译运行程序。
三、程序代码
/////////////////////////////////////////////////////////// Hook.h : main header file for the HOOK DLL #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 #ifndef __AFXWIN_H__ #error include 'stdafx.h' before including this file for PCH #endif #include "resource.h" // main symbols class CHookApp : public CWinApp { public: CHookApp(); // Overrides // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CHookApp) public: virtual BOOL InitInstance(); virtual int ExitInstance(); //}}AFX_VIRTUAL //{{AFX_MSG(CHookApp) // NOTE - the ClassWizard will add and remove member functions here. // DO NOT EDIT what you see in these blocks of generated code ! //}}AFX_MSG DECLARE_MESSAGE_MAP() }; LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); BOOL InitHotkey(); BOOL UnInit(); #endif ////////// Hook.cpp : Defines the initialization routines for the DLL. #include "stdafx.h" #include "hook.h" #include <windowsx.h> #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif #define MAX_KEY 100 #define CTRLBIT 0x04 #define ALTBIT 0x02 #define SHIFTBIT 0x01 #pragma data_seg("shareddata") HHOOK hHook =NULL; UINT nHookCount =0; static UCHAR HotKey[MAX_KEY] = {0}; //hotkey static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey static int KeyCount =0; static UCHAR MaskBits =0; //00000 Ctrl Alt Shift #pragma data_seg() HINSTANCE hins; void VerifyWindow(); BEGIN_MESSAGE_MAP(CHookApp, CWinApp) //{{AFX_MSG_MAP(CHookApp) // NOTE - the ClassWizard will add and remove mapping macros here. // DO NOT EDIT what you see in these blocks of generated code! //}}AFX_MSG_MAP END_MESSAGE_MAP() CHookApp::CHookApp() { // TODO: add construction code here, // Place all significant initialization in InitInstance } CHookApp theApp; LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) { BOOL bProcessed=FALSE; if(HC_ACTION==nCode) { if((lParam&0xc0000000)==0xc0000000){// Key up switch(wParam) { case VK_MENU: MaskBits&=~ALTBIT; break; case VK_CONTROL: MaskBits&=~CTRLBIT; break; case VK_SHIFT: MaskBits&=~SHIFTBIT; break; default: //judge the key and send message break; } for(int index=0;index<MAX_KEY;index++){ if(hCallWnd[index]==NULL) continue; if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) { SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); bProcessed=TRUE; } } } else if((lParam&0xc000ffff)==1){ //Key down switch(wParam) { case VK_MENU: MaskBits=ALTBIT; break; case VK_CONTROL: MaskBits=CTRLBIT; break; case VK_SHIFT: MaskBits=SHIFTBIT; break; default: //judge the key and send message break; } for(int index=0;index<MAX_KEY;index++) { if(hCallWnd[index]==NULL) continue; if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) { SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); bProcessed=TRUE; } } } if(!bProcessed){ for(int index=0;index<MAX_KEY;index++){ if(hCallWnd[index]==NULL) continue; if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); } } } return CallNextHookEx( hHook, nCode, wParam, lParam ); } BOOL InitHotkey() { if(hHook!=NULL){ nHookCount++; return TRUE; } else hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); if(hHook!=NULL) nHookCount++; return (hHook!=NULL); } BOOL UnInit() { if(nHookCount>1){ nHookCount--; return TRUE; } BOOL unhooked = UnhookWindowsHookEx(hHook); if(unhooked==TRUE){ nHookCount=0; hHook=NULL; } return unhooked; } BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) { BOOL bAdded=FALSE; for(int index=0;index<MAX_KEY;index++){ if(hCallWnd[index]==0){ hCallWnd[index]=hWnd; HotKey[index]=cKey; HotKeyMask[index]=cMask; bAdded=TRUE; KeyCount++; break; } } return bAdded; } BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) { BOOL bRemoved=FALSE; for(int index=0;index<MAX_KEY;index++){ if(hCallWnd[index]==hWnd){ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ hCallWnd[index]=NULL; HotKey[index]=0; HotKeyMask[index]=0; bRemoved=TRUE; KeyCount--; break; } } } return bRemoved; } void VerifyWindow() { for(int i=0;i<MAX_KEY;i++){ if(hCallWnd[i]!=NULL){ if(!IsWindow(hCallWnd[i])){ hCallWnd[i]=NULL; HotKey[i]=0; HotKeyMask[i]=0; KeyCount--; } } } } BOOL CHookApp::InitInstance() { AFX_MANAGE_STATE(AfxGetStaticModuleState()); hins=AfxGetInstanceHandle(); InitHotkey(); return CWinApp::InitInstance(); } int CHookApp::ExitInstance() { VerifyWindow(); UnInit(); return CWinApp::ExitInstance(); } ////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file #if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) #define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 class CCaptureDlg : public CDialog { // Construction public: BOOL bTray; BOOL bRegistered; BOOL RegisterHotkey(); UCHAR cKey; UCHAR cMask; void DeleteIcon(); void AddIcon(); UINT nCount; void SaveBmp(); CCaptureDlg(CWnd* pParent = NULL); // standard constructor // Dialog Data //{{AFX_DATA(CCaptureDlg) enum { IDD = IDD_CAPTURE_DIALOG }; CComboBox m_Key; BOOL m_bControl; BOOL m_bAlt; BOOL m_bShift; CString m_Path; CString m_Number; //}}AFX_DATA // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CCaptureDlg) public: virtual BOOL PreTranslateMessage(MSG* pMsg); protected: virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); //}}AFX_VIRTUAL // Implementation protected: HICON m_hIcon; // Generated message map functions //{{AFX_MSG(CCaptureDlg) virtual BOOL OnInitDialog(); afx_msg void OnSysCommand(UINT nID, LPARAM lParam); afx_msg void OnPaint(); afx_msg HCURSOR OnQueryDragIcon(); virtual void OnCancel(); afx_msg void OnAbout(); afx_msg void OnBrowse(); afx_msg void OnChange(); //}}AFX_MSG DECLARE_MESSAGE_MAP() }; #endif ////////////////////// CaptureDlg.cpp : implementation file #include "stdafx.h" #include "Capture.h" #include "CaptureDlg.h" #include <windowsx.h> #pragma comment(lib,"hook.lib") #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif #define IDM_SHELL WM_USER+1 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; class CAboutDlg : public CDialog { public: CAboutDlg(); // Dialog Data //{{AFX_DATA(CAboutDlg) enum { IDD = IDD_ABOUTBOX }; //}}AFX_DATA // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CAboutDlg) protected: virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support //}}AFX_VIRTUAL // Implementation protected: //{{AFX_MSG(CAboutDlg) //}}AFX_MSG DECLARE_MESSAGE_MAP() }; CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) { //{{AFX_DATA_INIT(CAboutDlg) //}}AFX_DATA_INIT } void CAboutDlg::DoDataExchange(CDataExchange* pDX) { CDialog::DoDataExchange(pDX); //{{AFX_DATA_MAP(CAboutDlg) //}}AFX_DATA_MAP } BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) //{{AFX_MSG_MAP(CAboutDlg) // No message handlers //}}AFX_MSG_MAP END_MESSAGE_MAP() CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) : CDialog(CCaptureDlg::IDD, pParent) { //{{AFX_DATA_INIT(CCaptureDlg) m_bControl = FALSE; m_bAlt = FALSE; m_bShift = FALSE; m_Path = _T("c:"); m_Number = _T("0 picture captured."); nCount=0; bRegistered=FALSE; bTray=FALSE; //}}AFX_DATA_INIT // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); } void CCaptureDlg::DoDataExchange(CDataExchange* pDX) { CDialog::DoDataExchange(pDX); //{{AFX_DATA_MAP(CCaptureDlg) DDX_Control(pDX, IDC_KEY, m_Key); DDX_Check(pDX, IDC_CONTROL, m_bControl); DDX_Check(pDX, IDC_ALT, m_bAlt); DDX_Check(pDX, IDC_SHIFT, m_bShift); DDX_Text(pDX, IDC_PATH, m_Path); DDX_Text(pDX, IDC_NUMBER, m_Number); //}}AFX_DATA_MAP } BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) //{{AFX_MSG_MAP(CCaptureDlg) ON_WM_SYSCOMMAND() ON_WM_PAINT() ON_WM_QUERYDRAGICON() ON_BN_CLICKED(ID_ABOUT, OnAbout) ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ON_BN_CLICKED(ID_CHANGE, OnChange) //}}AFX_MSG_MAP END_MESSAGE_MAP() BOOL CCaptureDlg::OnInitDialog() { CDialog::OnInitDialog(); ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ASSERT(IDM_ABOUTBOX < 0xF000); CMenu* pSysMenu = GetSystemMenu(FALSE); if (pSysMenu != NULL) { CString strAboutMenu; strAboutMenu.LoadString(IDS_ABOUTBOX); if (!strAboutMenu.IsEmpty()) { pSysMenu->AppendMenu(MF_SEPARATOR); pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); } } SetIcon(m_hIcon, TRUE); // Set big icon SetIcon(m_hIcon, FALSE); // Set small icon m_Key.SetCurSel(0); RegisterHotkey(); CMenu* pMenu=GetSystemMenu(FALSE); pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); return TRUE; // return TRUE unless you set the focus to a control } void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) { if ((nID & 0xFFF0) == IDM_ABOUTBOX) { CAboutDlg dlgAbout; dlgAbout.DoModal(); } else { CDialog::OnSysCommand(nID, lParam); } } void CCaptureDlg::OnPaint() { if (IsIconic()) { CPaintDC dc(this); // device context for painting SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); // Center icon in client rectangle int cxIcon = GetSystemMetrics(SM_CXICON); int cyIcon = GetSystemMetrics(SM_CYICON); CRect rect; GetClientRect(&rect); int x = (rect.Width() - cxIcon + 1) / 2; int y = (rect.Height() - cyIcon + 1) / 2; // Draw the icon dc.DrawIcon(x, y, m_hIcon); } else { CDialog::OnPaint(); } } HCURSOR CCaptureDlg::OnQueryDragIcon() { return (HCURSOR) m_hIcon; } void CCaptureDlg::OnCancel() { if(bTray) DeleteIcon(); CDialog::OnCancel(); } void CCaptureDlg::OnAbout() { CAboutDlg dlg; dlg.DoModal(); } void CCaptureDlg::OnBrowse() { CString str; BROWSEINFO bi; char name[MAX_PATH]; ZeroMemory(&bi,sizeof(BROWSEINFO)); bi.hwndOwner=GetSafeHwnd(); bi.pszDisplayName=name; bi.lpszTitle="Select folder"; bi.ulFlags=BIF_RETURNONLYFSDIRS; LPITEMIDLIST idl=SHBrowseForFolder(&bi); if(idl==NULL) return; SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); str.ReleaseBuffer(); m_Path=str; if(str.GetAt(str.GetLength()-1)!='') m_Path+=""; UpdateData(FALSE); } void CCaptureDlg::SaveBmp() { CDC dc; dc.CreateDC("DISPLAY",NULL,NULL,NULL); CBitmap bm; int Width=GetSystemMetrics(SM_CXSCREEN); int Height=GetSystemMetrics(SM_CYSCREEN); bm.CreateCompatibleBitmap(&dc,Width,Height); CDC tdc; tdc.CreateCompatibleDC(&dc); CBitmap*pOld=tdc.SelectObject(&bm); tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); tdc.SelectObject(pOld); BITMAP btm; bm.GetBitmap(&btm); DWORD size=btm.bmWidthBytes*btm.bmHeight; LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); BITMAPINFOHEADER bih; bih.biBitCount=btm.bmBitsPixel; bih.biClrImportant=0; bih.biClrUsed=0; bih.biCompression=0; bih.biHeight=btm.bmHeight; bih.biPlanes=1; bih.biSize=sizeof(BITMAPINFOHEADER); bih.biSizeImage=size; bih.biWidth=btm.bmWidth; bih.biXPelsPerMeter=0; bih.biYPelsPerMeter=0; GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); static int filecount=0; CString name; name.Format("pict%04d.bmp",filecount++); name=m_Path+name; BITMAPFILEHEADER bfh; bfh.bfReserved1=bfh.bfReserved2=0; bfh.bfType=((WORD)('M'<< 8)'B'); bfh.bfSize=54+size; bfh.bfOffBits=54; CFile bf; if(bf.Open(name,CFile::modeCreateCFile::modeWrite)){ bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); bf.WriteHuge(lpData,size); bf.Close(); nCount++; } GlobalFreePtr(lpData); if(nCount==1) m_Number.Format("%d picture captured.",nCount); else m_Number.Format("%d pictures captured.",nCount); UpdateData(FALSE); } BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) { if(pMsg -> message == WM_KEYDOWN) { if(pMsg -> wParam == VK_ESCAPE) return TRUE; if(pMsg -> wParam == VK_RETURN) return TRUE; } return CDialog::PreTranslateMessage(pMsg); } LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) { if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ SaveBmp(); return FALSE; } if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ CMenu pop; pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); CMenu*pMenu=pop.GetSubMenu(0); pMenu->SetDefaultItem(ID_EXITICON); CPoint pt; GetCursorPos(&pt); int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGNTPM_NONOTIFYTPM_RETURNCMDTPM_LEFTBUTTON,pt.x,pt.y,this); if(id==ID_EXITICON) DeleteIcon(); else if(id==ID_EXIT) OnCancel(); return FALSE; } LRESULT res= CDialog::WindowProc(message, wParam, lParam); if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) AddIcon(); return res; } void CCaptureDlg::AddIcon() { NOTIFYICONDATA data; data.cbSize=sizeof(NOTIFYICONDATA); CString tip; tip.LoadString(IDS_ICONTIP); data.hIcon=GetIcon(0); data.hWnd=GetSafeHwnd(); strcpy(data.szTip,tip); data.uCallbackMessage=IDM_SHELL; data.uFlags=NIF_ICONNIF_MESSAGE NIF_TIP ; data.uID=98; Shell_NotifyIcon(NIM_ADD,&data); ShowWindow(SW_HIDE); bTray=TRUE; } void CCaptureDlg::DeleteIcon() { NOTIFYICONDATA data; data.cbSize=sizeof(NOTIFYICONDATA); data.hWnd=GetSafeHwnd(); data.uID=98; Shell_NotifyIcon(NIM_DELETE,&data); ShowWindow(SW_SHOW); SetForegroundWindow(); ShowWindow(SW_SHOWNORMAL); bTray=FALSE; } void CCaptureDlg::OnChange() { RegisterHotkey(); } BOOL CCaptureDlg::RegisterHotkey() { UpdateData(); UCHAR mask=0; UCHAR key=0; if(m_bControl) mask=4; if(m_bAlt) mask=2; if(m_bShift) mask=1; key=Key_Table[m_Key.GetCurSel()]; if(bRegistered){ DeleteHotkey(GetSafeHwnd(),cKey,cMask); bRegistered=FALSE; } cMask=mask; cKey=key; bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); return bRegistered; } |
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