vc使用技巧集（三）

21、如何在對話框中從磁盤讀出一個bitmap文件畫在上面？

 

BOOL CAboutDlg::OnInitDialog() { CDialog::OnInitDialog(); HBITMAP m_hBmp = (HBITMAP)::LoadImage(0, "D:////bitmap.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE | LR_CREATEDIBSECTION | LR_DEFAULTSIZE); _ASSERT(m_hBmp!=NULL); m_pBmp = CBitmap::FromHandle(m_hBmp); return TRUE; } void CAboutDlg::OnPaint() { CPaintDC dc(this); BITMAP bm; CDC dcMem; VERIFY(m_pBmp->GetObject(sizeof(bm),(LPVOID)&bm)); dcMem.CreateCompatibleDC(&dc); CBitmap *pOldBMP=(CBitmap *)dcMem.SelectObject(m_pBmp); BitBlt(dc.m_hDC,0, 0, bm.bmWidth, bm.bmHeight, dcMem.m_hDC, 0, 0, SRCCOPY); dcMem.SelectObject(pOldBMP); // Do not call CDialog::OnPaint() for painting messages }   

22、全屏顯示Dialog

 if(m_bFullScreen) { SetWindowPlacement(&m_OldWndPlacement); } else { GetWindowPlacement(&m_OldWndPlacement); //取得原始窗口位置 int nFullWidth = GetSystemMetrics(SM_CXSCREEN); int nFullHeight = GetSystemMetrics(SM_CYSCREEN); RECT WindowRect, ClientRect; GetWindowRect(&WindowRect); GetDlgItem(IDC_VIEW)->GetWindowRect(&ClientRect); RECT FullScreenRect; FullScreenRect.left = WindowRect.left - ClientRect.left; FullScreenRect.top = WindowRect.top - ClientRect.top; FullScreenRect.right = WindowRect.right - ClientRect.right + nFullWidth - FullScreenRect.left; FullScreenRect.bottom = WindowRect.bottom - ClientRect.bottom + nFullHeight - FullScreenRect.top; WINDOWPLACEMENT wndpl; wndpl.length = sizeof(WINDOWPLACEMENT); wndpl.flags = 0; wndpl.showCmd = SW_SHOWNORMAL; wndpl.rcNormalPosition = FullScreenRect; SetWindowPlacement(&wndpl); GetDlgItem(IDC_VIEW)->SetWindowPos(NULL, 0, 0, nFullWidth, nFullHeight, SWP_NOMOVE); } m_bFullScreen = !m_bFullScreen;

23、數據庫連接串

  //連接SQL SERVER

  m_pConnection->Open("Driver=SQL

 

Server;Database=test;Server=127.0.0.1;UID=sa;PWD=;","","",adModeUnknown);

  //連接ACCESS2000

  m_pConnection->Open("Provider=Microsoft.Jet.OLEDB.4.0;Data

 

Source=userinfo.mdb","","",adModeUnknown);

 

24、void CDVRDlg::OnWindowPosChanging(WINDOWPOS FAR* lpwndpos) { //在窗口改變之前調用的方法：窗口的最小尺寸。 //CDialog::OnWindowPosChanging(lpwndpos); //註銷這句避免無法最大化窗口 if (lpwndpos->cx < 400) lpwndpos->cx = 400; if (lpwndpos->cy < 300) lpwndpos->cy = 300; } this->InvalidateRect(CRect(30,y-30,150,y-20),TRUE);//重新繪製矩形，用於更新時間。 void CDVRDlg::OnLButtonUp(UINT nFlags, CPoint point) { //點擊鼠標響應事件 CRect changeApp_rect(77,119,41,95); //判斷是否在這個changeApp_rect區域，如果在就執行調用其它應用程序操作。 if(changeApp_rect.PtInRect(point)) { if(AfxMessageBox("確定切換到筆錄系統嗎?",MB_YESNO)==IDYES) { WinExec("D://test//Debug//DlgSplashScr.exe",SW_SHOW); OnClose(); } } }   

void CFileNameView::OnDraw(CDC＊ pDC) { CFileNameDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); CRect rectClient; CBrush brushBkColor; GetClientRect(rectClient); brushBkColor.CreateSolidBrush(RGB(255,0,0)); //顏色設置 pDC->DPtoLP(rectClient); pDC->FillRect(rectClient,&brushBkColor); … }   

24、修改單文檔程序的標題：

 

OnCreat()中加入 SetWindowText("程序標題"); CMainFrame::PreCreateWindow(CREATESTRUCT& cs)中加入 cs.style =WS_OVERLAPPEDWINDOW; cs.style &= ~WStyle &= ~WS_THICKFRAME; //不可改變大小  

 

25播放聲音

 

導入 #pragma comment(lib, "Winmm") #include "mmsystem.h" PlaySound(MAKEINTRESOURCE(IDR_RINGIN), AfxGetResourceHandle(), SND_ASYNC | SND_RESOURCE | SND_NODEFAULT);   

 

 

26.設置窗口最前

    m_pMainWnd->SetWindowPos(&m_pMainWnd->wndTopMost, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE);

 

 

27.MsgWnd

void CMainFrame::OnViewMsn() { CMsgWnd *pMsgWindow=new CMsgWnd(IDB_SHOWMSG); CMsgWnd& msgWindow=*pMsgWindow; msgWindow.CreateMsgWindow(); msgWindow.ShowWindow(SW_SHOW); msgWindow.UpdateWindow(); }   

28、改變視圖背景色：

    在CView的OnDraw函數中添寫如下一段程序代碼：