VC++ 编程荟萃(41-60)

最新推荐文章于 2021-07-18 23:50:10 发布

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#vc++ #编程 #timer #command #null #textbox

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本文汇总了MFC编程中常用的技术细节，包括自定义3D按钮样式、设置定时器、改变程序图标、获取鼠标位置等实用功能的实现方法。通过这些示例，读者可以了解如何在MFC应用中增强用户体验和功能丰富性。

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41 3DButton类 - 继承CButton

//3dButton.h #if !defined(AFX_3DTEXTBUTTON_H__89A5F2C3_24C8_45CE_9399_12FE3FB3FB66__INCLUDED_) #define AFX_3DTEXTBUTTON_H__89A5F2C3_24C8_45CE_9399_12FE3FB3FB66__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 // 3DTextButton.h : header file // ///////////////////////////////////////////////////////////////////////////// // C3DTextButton window class C3DTextButton : public CButton { // Construction public: C3DTextButton(); // Attributes public: // Operations public: // Overrides // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(C3DTextButton) public: virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct); //}}AFX_VIRTUAL // Implementation public: virtual ~C3DTextButton(); // Generated message map functions protected: void Draw(CDC* pDC, const CRect& rect, UINT state); //{{AFX_MSG(C3DTextButton) //}}AFX_MSG DECLARE_MESSAGE_MAP() }; ///////////////////////////////////////////////////////////////////////////// //{{AFX_INSERT_LOCATION}} // Microsoft Visual C++ will insert additional declarations immediately before the previous line. #endif // !defined(AFX_3DTEXTBUTTON_H__89A5F2C3_24C8_45CE_9399_12FE3FB3FB66__INCLUDED_) //3dbutton.cpp // 3DTextButton.cpp : implementation file // #include "stdafx.h" #include "3DButton.h" #include "3DTextButton.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // C3DTextButton C3DTextButton::C3DTextButton() { } C3DTextButton::~C3DTextButton() { } BEGIN_MESSAGE_MAP(C3DTextButton, CButton) //{{AFX_MSG_MAP(C3DTextButton) //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // C3DTextButton message handlers void C3DTextButton::Draw(CDC *pDC, const CRect &rect, UINT state) { CString text; GetWindowText(text); int l=text.GetLength(); CRect rectClient=rect; //获得控件的字体 CFont* pFont=GetFont(); //确定所选字体有效高度和宽度 LOGFONT logfont; pFont->GetObject(sizeof(LOGFONT),&logfont); if(logfont.lfHeight==0)logfont.lfHeight=20; logfont.lfWidth=0;//宽度设为0，宽度值由高度确定 logfont.lfWeight=1000; logfont.lfEscapement=logfont.lfOrientation=0; CFont tryfont; VERIFY(tryfont.CreateFontIndirect(&logfont)); CFont* pFontOld=pDC->SelectObject(&tryfont); //根据控件大小，调整字体的高度，使文本与控件协调 CSize textSizeClient=pDC->GetTextExtent(text,l); if(rectClient.Width()*textSizeClient.cy>rectClient.Height()*textSizeClient.cx) { logfont.lfHeight=::MulDiv(logfont.lfHeight,rectClient.Height(),textSizeClient.cy); } else{ logfont.lfHeight = ::MulDiv(logfont.lfHeight,rectClient.Width(),textSizeClient.cx); } //创建并选择协调后的字体 CFont font; font.CreateFontIndirect(&logfont); pDC->SelectObject(&font); textSizeClient=pDC->GetTextExtent(text,l); //确定文本与控件边界的距离minx,miny int minx=rectClient.left+(rectClient.Width()-textSizeClient.cx)/2; int miny=rectClient.top+(rectClient.Height()-textSizeClient.cy)/2; int oldBkMode=pDC->SetBkMode(TRANSPARENT); COLORREF textcol=::GetSysColor(COLOR_BTNTEXT); COLORREF oldTextColor=pDC->SetTextColor(textcol); int cx = minx; int cy = miny; int s=(state&ODS_SELECTED)?-1:+1; cx+= 3; cy+= 3; //实现3D效果 pDC->SetTextColor(::GetSysColor(COLOR_3DDKSHADOW)); pDC->TextOut(cx-s*2,cy+s*2,text); pDC->TextOut(cx+s*2,cy-s*2,text); pDC->TextOut(cx+s*2,cy+s*2,text); pDC->SetTextColor(::GetSysColor(COLOR_3DHILIGHT)); pDC->TextOut(cx+s*1,cy-s*2,text); pDC->TextOut(cx-s*2,cy+s*1,text); pDC->TextOut(cx-s*2,cy-s*2,text); pDC->SetTextColor(::GetSysColor(COLOR_3DSHADOW)); pDC->TextOut(cx-s*1,cy+s*1,text); pDC->TextOut(cx+s*1,cy-s*1,text); pDC->TextOut(cx+s*1,cy+s*1,text); pDC->SetTextColor(::GetSysColor(COLOR_3DLIGHT)); pDC->TextOut(cx,cy-s*1,text); pDC->TextOut(cx-s*1,cy,text); pDC->TextOut(cx-s*1,cy-s*1,text); pDC->SetTextColor(textcol); //输出标题 pDC->TextOut(cx,cy,text); //恢复设备描述表 pDC->SetTextColor(oldTextColor); pDC->SetBkMode(oldBkMode); pDC->SelectObject(pFontOld); } //DEL void C3DTextButton::OnDrawItem(int nIDCtl, LPDRAWITEMSTRUCT lpDrawItemStruct) //DEL { //DEL // TODO: Add your message handler code here and/or call default //DEL //DEL CDC* pDC=CDC::FromHandle(lpDrawItemStruct->hDC); //DEL ASSERT_VALID(pDC); //DEL CRect rectClient=lpDrawItemStruct->rcItem; //DEL Draw(pDC,rectClient,lpDrawItemStruct->itemState); //DEL //DEL CButton::OnDrawItem(nIDCtl, lpDrawItemStruct); //DEL } void C3DTextButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct) { // TODO: Add your code to draw the specified item CDC* pDC=CDC::FromHandle(lpDrawItemStruct->hDC); ASSERT_VALID(pDC); CRect rectClient=lpDrawItemStruct->rcItem; Draw(pDC,rectClient,lpDrawItemStruct->itemState); }

42 Timer 计时器

//.h // Generated message map functions protected: int timer2; int timer1; //{{AFX_MSG(CTimerView) afx_msg void OnBegin(); afx_msg void OnTimer(UINT nIDEvent); afx_msg void OnStop(); //}}AFX_MSG DECLARE_MESSAGE_MAP() private: UINT m_nTimer2; UINT m_nTimer1; //.cpp void CTimerView::OnBegin() { // TODO: Add your command handler code here // 添加两个定时器 Invalidate(); m_nTimer1 = SetTimer(24,500,NULL); m_nTimer2 = SetTimer(25,1000,NULL); timer1 = 0; timer2 = 0; } void CTimerView::OnTimer(UINT nIDEvent) { // TODO: Add your message handler code here and/or call default switch (nIDEvent) { case 24: { timer1++; CClientDC dc(this); dc.TextOut( timer1,timer2,"mytimer1"); break; } case 25: { timer2++; CClientDC dc(this); dc.TextOut( timer2,timer1,"mytimer2"); break; } } CView::OnTimer(nIDEvent); } void CTimerView::OnStop() { // TODO: Add your command handler code here KillTimer ( m_nTimer1); KillTimer ( m_nTimer2); }

43 动态改变应用程序头图标

HICON hIcon1 = AfxGetApp() ->LoadIcon ( IDI_ICON1); SendMessage ( WM_SETICON, ICON_SMALL, (LPARAM)hIcon1);

44 获取鼠标位置

void CCaptureMouseView::OnLButtonDown(UINT nFlags, CPoint point) { // TODO: Add your message handler code here and/or call default SetCapture(); CView::OnLButtonDown(nFlags, point); } void CCaptureMouseView::OnMouseMove(UINT nFlags, CPoint point) { // TODO: Add your message handler code here and/or call default CDC *pDC = GetDC(); char buf[100]; wsprintf( buf, "鼠标坐标:%d,%d", point.x, point.y); pDC->TextOut ( 0,10,"鼠标捕获实例"); pDC->TextOut ( 0,30, buf); CView::OnMouseMove(nFlags, point); } void CCaptureMouseView::OnLButtonUp(UINT nFlags, CPoint point) { // TODO: Add your message handler code here and/or call default ReleaseCapture(); CView::OnLButtonUp(nFlags, point); }

45 获取系统信息

//m_开头的为textbox控件变量 void CSysInfoDlg::OnGetsysinfo() { // TODO: Add your control notification handler code here //获取计算机名 DWORD size = MAX_COMPUTERNAME_LENGTH + 1; TCHAR buffer[MAX_COMPUTERNAME_LENGTH + 1]; GetComputerName (buffer , & size); m_name = buffer; //获取Windows版本信息 OSVERSIONINFO osvi; char buf[50]; osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); GetVersionEx ( &osvi); wsprintf ( buf , "Win%d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion); m_version = buf; //获取CPU信息 SYSTEM_INFO CUP_info; GetSystemInfo ( &CUP_info); if ( CUP_info.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_INTEL) { if ( CUP_info.dwProcessorType == PROCESSOR_INTEL_486) m_cup = " 80486处理器"; if ( CUP_info.dwProcessorType == PROCESSOR_INTEL_PENTIUM ) m_cup = " 奔腾或更高处理器"; } if ( CUP_info.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_UNKNOWN) m_cup = "未知的处理器"; //获取内存信息 MEMORYSTATUS memStatus; memStatus.dwLength = sizeof (MEMORYSTATUS ); GlobalMemoryStatus ( & memStatus); m_physTotal = memStatus.dwTotalPhys; m_physAvail = memStatus.dwAvailPhys; m_used = memStatus.dwMemoryLoad; m_virtualTotal = memStatus.dwTotalVirtual; m_virtualAvail = memStatus.dwAvailVirtual; UpdateData ( FALSE); }

46 获取应用程序路径

char path[100]; GetModuleFileName(NULL,path,100);

47 注册热键

CString m_tip; BEGIN_MESSAGE_MAP(CMyDlg, CDialog) ON_MESSAGE(WM_HOTKEY,OnHotKey) END_MESSAGE_MAP() void CMyDlg::OnRegister() { // TODO: Add your control notification handler code here ::RegisterHotKey(m_hWnd,0xB4EE,MOD_CONTROL|MOD_ALT,'z');//register a hotkey ::RegisterHotKey(m_hWnd,0xB4EF,MOD_CONTROL|MOD_ALT,'Z'); m_tip="为本窗口注册系统热键‘Ctrl+Alt+Z’成功"; UpdateData(FALSE);//将变量中的内容显示到对话框中 } LRESULT CMyDlg::OnHotKey(WPARAM wParam,LPARAM lParam) { if(wParam==0xB4EE || wParam==0xB4EF) CWnd::SetForegroundWindow();//this->SetForegroundWindow(); return 0; } void CMyDlg::OnDestroy() { CDialog::OnDestroy(); UnregisterHotKey(m_hWnd,0xB4EE); UnregisterHotKey(m_hWnd,0xB4EF); }

48 检测光驱,软驱,硬盘卷标是否就绪

#include "io.h" //add in //list为listbox控件变量 BOOL CCheckDriveDlg::OnInitDialog() { CDialog::OnInitDialog(); // TODO: Add extra initialization here char * drive[2] = { "C://","F://"}; CListBox *list=(CListBox *)GetDlgItem(IDC_LIST1); list->AddString(drive[0]); list->AddString(drive[1]); list->SetCurSel(0); return TRUE; // return TRUE unless you set the focus to a control // EXCEPTION: OCX Property Pages should return FALSE } void CCheckDriveDlg::OnCheck() { // TODO: Add your control notification handler code here UINT oldErrorState; char name[8]; int curItem; if((curItem=SendDlgItemMessage(IDC_LIST1, LB_GETCURSEL,0,0))==LB_ERR) m_status = "选择驱动器"; SendDlgItemMessage(IDC_LIST1,LB_GETTEXT,curItem,(LPARAM)name); oldErrorState=SetErrorMode(SEM_FAILCRITICALERRORS); if(_access(name,0)==0) m_status = "就绪"; else m_status = "未就绪"; SetErrorMode(oldErrorState); UpdateData (FALSE); } void CCheckDriveDlg::OnDblclkList1() { // TODO: Add your control notification handler code here OnCheck();//增加双击列表框某一选项的功能 }

49 判断驱动器的类型

void CDriveTypeDlg::OnGetdrivetype() { // TODO: Add your control notification handler code here UpdateData (TRUE); char buf[100]; buf[0] = m_drive.GetAt(0); buf[1] = m_drive.GetAt(1);//比如输入C: buf[2] = '//'; buf[3] = '//'; buf[4] = NULL; int drv; drv = GetDriveType( buf); switch ( drv) { case DRIVE_REMOVABLE: m_type = "软盘" ; break; case DRIVE_FIXED: m_type = "硬盘" ; break; case DRIVE_REMOTE: m_type = "网络磁盘" ; break; case DRIVE_CDROM: m_type = "光驱" ; break; case DRIVE_RAMDISK: m_type = "RAM磁盘" ; break; default: m_type = "不知道的磁盘类型"; break; } UpdateData (FALSE); }

50 获取磁盘容量

//m_**为textbox控件变量 void CDiskSizeDlg::OnDisksize() { // TODO: Add your control notification handler code here DWORD SectorsPerCluster; // sectors per cluster DWORD BytesPerSector; // bytes per sector DWORD NumberOfFreeClusters; // free clusters DWORD TotalNumberOfClusters; // total clusters if ( GetDiskFreeSpace( "c://", &SectorsPerCluster, &BytesPerSector, &NumberOfFreeClusters, &TotalNumberOfClusters )) { m_used=((TotalNumberOfClusters-NumberOfFreeClusters)/1024) *(SectorsPerCluster*BytesPerSector); m_total=(TotalNumberOfClusters/1024) *(SectorsPerCluster*BytesPerSector); m_free=(NumberOfFreeClusters/1024) *(SectorsPerCluster*BytesPerSector); UpdateData ( FALSE ); } else MessageBox("error"); }

51 格式化磁盘

//SHSTDAPI_(DWORD) SHFormatDrive(HWND,WORD,WORD,WORD); void CMyFormatDlg::OnStartFormat() { // TODO: Add your control notification handler code here long result; char buf[2]; UpdateData(TRUE); m_driver_name.MakeUpper(); strcpy(buf,m_driver_name);//m_driver_name为CString,传入盘符 WORD wDrive=buf[0]-'A'; result=SHFormatDrive(this->m_hWnd,wDrive,0xffff,0); if(result==-1) AfxMessageBox("操作失败！"); }

52 win98关机热键

//hotkey 参考上面热键 //使用windows api关机 ExitWindowsEx(EWX_SHUTDOWN,0);

53 获取当前屏幕分辨率的两种方法

void CGetResolutionView::OnFirst() { // TODO: Add your command handler code here char current[100]; DEVMODE dm; dm.dmSize=sizeof(DEVMODE); ::EnumDisplaySettings(NULL,ENUM_CURRENT_SETTINGS,&dm); wsprintf(current,"显示器分辨率为%dx%d", dm.dmPelsWidth, dm.dmPelsHeight); resolution.Insert ( 0, current); InvalidateRect(NULL,TRUE); } void CGetResolutionView::OnSecond() { // TODO: Add your command handler code here int width = GetSystemMetrics ( SM_CXSCREEN ); int height= GetSystemMetrics ( SM_CYSCREEN ); char current[100]; wsprintf(current,"显示器分辨率为%dx%d", width, height); resolution.Insert ( 0, current); InvalidateRect(NULL,TRUE); }

54 在屏幕上写文字

void CMainFrame::OnScreenfont() { // TODO: Add your command handler code here // CDC * pDC = CWnd::GetDesktopWindow()->GetDC(); // pDC ->TextOut(0 ,0, "font"); CWindowDC dc(NULL); CFont myFont; myFont.CreateFont ( 120, // nHeight 字体高度 40, // nWidth 字体宽度 0, // nEscapement 显示角度 0, // nOrientation 字体角度 FW_NORMAL, // nWeight 字体磅值 FALSE, // bItalic 是否倾斜 FALSE, // bUnderline 是否斜体 0, // cStrikeOut 是否加删除线 ANSI_CHARSET, // nCharSet 指定字符集 OUT_DEFAULT_PRECIS, // nOutPrecision 指定输出精度 CLIP_DEFAULT_PRECIS, // nClipPrecision 指定剪切精度 DEFAULT_QUALITY, // nQuality 指定输出质量 DEFAULT_PITCH | FF_SWISS, // nPitchAndFamily 字符族 "Arial"); // 指定字体的字样名 CFont* oldFont = dc.SelectObject ( &myFont); dc.SetTextColor (RGB (255,0,0)); dc.SetBkMode ( TRANSPARENT); //背景模式为透明 dc.TextOut(200,200,"屏幕上显示文字"); dc.SelectObject ( oldFont); }

55 启动屏保的两种方法

void CGoScrView::OnGoscrFirst() { // TODO: Add your command handler code here PostMessage( WM_SYSCOMMAND, SC_SCREENSAVE, 0); } //第二种方法在XP sp3下无效. void CGoScrView::OnGoscrSecond() { // TODO: Add your command handler code here ShellExecute( GetSafeHwnd(), "open", "c://winnt//system32//ssstars.scr", NULL, NULL, SW_SHOWNORMAL); }

56 win2000下关机

void CCloseWindowView::CloseWindow(void) { HANDLE hToken; TOKEN_PRIVILEGES tkp; //取得当前进程存权令牌的句柄 if ( !OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken)) { MessageBox ( "无法关机"); return ; } //得到关机特权的LUID LookupPrivilegeValue(NULL, SE_SHUTDOWN_NAME, &tkp.Privileges[0].Luid); //使进程具有关机特权 tkp.PrivilegeCount = 1; tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; AdjustTokenPrivileges(hToken, FALSE, &tkp, 0, (PTOKEN_PRIVILEGES)NULL, 0); if (GetLastError() != ERROR_SUCCESS) { MessageBox ( "无法关机"); } //关机 if (!ExitWindowsEx(EWX_POWEROFF , 0)) { MessageBox ( "无法关机"); } }

57 屏蔽系统热键

// 不知道屏蔽的什么 void CMyDlg::OnDisable() { // TODO: Add your control notification handler code here SystemParametersInfo(SPI_SETSCREENSAVERRUNNING,1,NULL,0); m_tip="系统热键被屏蔽,不能使用"; UpdateData(FALSE);//将变量中的内容显示到对话框 } void CMyDlg::OnEnable() { // TODO: Add your control notification handler code here SystemParametersInfo(SPI_SETSCREENSAVERRUNNING,0,NULL,0); m_tip="系统热键可以使用"; UpdateData(FALSE);//将变量中的内容显示到对话框中 }

58 屏蔽系统热键

SystemParametersInfo(SPI_SETSCREENSAVERRUNNING,1,NULL,0); m_tip="系统热键被屏蔽,不能使用"; UpdateData(FALSE);//将变量中的内容显示到对话框 SystemParametersInfo(SPI_SETSCREENSAVERRUNNING,0,NULL,0); m_tip="系统热键可以使用"; UpdateData(FALSE);//将变量中的内容显示到对话框中

59 获取文件图标为本窗口栏的图标

void CMainFrame::OnGeticonFirst() { // TODO: Add your command handler code here SHFILEINFO stFileInfo; //取得记事本的图标 if( :: SHGetFileInfo(_T("c://windows//notepad.exe"),0, &stFileInfo,sizeof(stFileInfo),SHGFI_ICON)) { //作为本例程的图标 SendMessage ( WM_SETICON, ICON_SMALL, (LPARAM)stFileInfo.hIcon); } } void CMainFrame::OnGeticonSecond() { // TODO: Add your command handler code here //取得画笔的图标 HICON hIcon = ::ExtractIcon ( AfxGetInstanceHandle(), "c://WINDOWS//system32//mspaint.exe" ,0) ; if ( hIcon != NULL) { SendMessage ( WM_SETICON, ICON_SMALL, (LPARAM)hIcon); } }

60 避免程序运行多个实例

//在初始化中加入互斥事件 BOOL CMyApp::InitInstance() { CString mutexName="oneInstanceMutexNew"; myMutex=OpenMutex(MUTEX_ALL_ACCESS,FALSE,mutexName); if(myMutex==NULL) { myMutex=CreateMutex(NULL,TRUE,mutexName); } else { AfxMessageBox("已有一个实例正在运行"); return FALSE; } ..... }