我用HDC hdc=::GetDC(hwnd);怎么，打开的窗口关闭了阿

bingtuohun 2007-04-30 12:50:26

CWnd* pWnd=CWnd::FindWindow(NULL,"新建 BMP 图像 (2).bmp - 画图");
HWND hwnd=pWnd->GetSafeHwnd();

HDC hdc=::GetDC(hwnd);

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gdi DC 获取DC // 第一种 ::GetDC(hWnd); ::ReleaseDC(hwnd, hdc); // 第二种 PAINTSTRUCT ps; ::BeginPaint(hwnd, &ps); ::EndPaint(hwnd, &ps); // 第三种创建兼容内存DC HDC hMemDC = ::CreateCompatibleDC(hDest); ::DeleteDC(hMemDC); 操作DC SaveDC RestoreDC gdi对象分类画笔HPEN 画刷HBRUSH 字体HFONT 区域HRGN 位图HBITMAP 通用gdi对象

获得CDC * CDC* pDC pDC=GetDC();//原型CDC* CWnd::GetDC() 获得hdc HDC hDC; 1,hDC=GetDC(pCpp->hWnd); 2,pDC->m_hDC;

ampm = false; m_hWndParent = hWndParent; m_hWnd = CreateWindow(classname, NULL, WS_POPUP | WS_VISIBLE, 0, 0, WIDTH_AMPM+LEADING+TRAILING, 21, m_hWndParent, NULL, hInst, NULL); m_hMenu = LoadMenu(hInst, (LPCSTR)IDC_LCDCLOCK); m_hPopMenu = GetSubMenu(m_hMenu, 0); HDC hdc = GetDC(m_hWnd); m_compDC = CreateCompatibleDC(hdc); ReleaseDC(m_hWnd, hdc); m_hClock = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_CLOCK)); SelectObject(m_compDC, m_hClock); SetWindowLong(m_hWnd, GWL_WNDPROC, (long) ClockWndProc); SetWindowLong(m_hWnd, GWL_USERDATA, (long) this);

代码完整，开发框架需要自己搭建 bool hest::onMouseMove(FB::MouseMoveEvent *evt, FB::PluginWindow *win) { //printf("Mouse move at: %d, %d\n", evt->m_x, evt->m_y); m_mousePosXnew=evt->m_x,m_mousePosYnew=evt->m_y; if(b_isDown) { FB::PluginWindowWin *wnd =dynamic_cast< FB::PluginWindowWin*>(win); char *a; HWND hWnd = wnd->getHWND(); HDC hDC=GetDC(hWnd);

该代码是基于vc的数据可视化功能 #include #include LRESULT CALLBACK WangProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam ); int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd ) { WNDCLASS wndcls; wndcls.cbClsExtra=0; wndcls.cbWndExtra=0; wndcls.hbrBackground=NULL;//(HBRUSH)GetStockObject(BLACK_BRUSH); wndcls.hCursor=LoadCursor(NULL,IDC_NO); wndcls.hIcon=LoadIcon(NULL,IDI_ERROR); wndcls.hInstance=hInstance; wndcls.lpfnWndProc=WangProc; wndcls.lpszClassName="王朝帅"; wndcls.lpszMenuName=NULL; wndcls.style=CS_VREDRAW | CS_PARENTDC/* | CS_HREDRAW*/; RegisterClass(&wndcls); HWND hwnd; hwnd=CreateWindow("王朝帅","安徽大学计算机科学与技术学院王朝帅",WS_OVERLAPPEDWINDOW, 50,50,600,400,0,0,0,NULL); ShowWindow(hwnd,SW_SHOWNORMAL); UpdateWindow(hwnd); MSG msg; while(GetMessage(&msg,hwnd,0,0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return 0; } LRESULT CALLBACK WangProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam ) { switch(uMsg) { case WM_CHAR: char szChar[20]; sprintf(szChar,"char is '%c'",wParam); MessageBox(hwnd,szChar,"朝帅作品",MB_OK); break; case WM_LBUTTONDOWN: MessageBox(hwnd,"mouse clicked","朝帅作品",MB_OK); HDC hdc; hdc=GetDC(hwnd); TextOut(hdc,0,50,"MFC学习中心--朝帅作品",strlen("MFC学习中心--朝帅作品")); ReleaseDC(hwnd,hdc); break; case WM_PAINT: HDC hDC; PAINTSTRUCT ps; hDC=BeginPaint(hwnd,&ps); TextOut(hDC,0,0,"MFC培训",strlen("MFC培训")); EndPaint(hwnd,&ps); break; case WM_CLOSE: if(IDYES==MessageBox(hwnd,"是否真的结束？","朝帅作品",MB_YESNO)) { DestroyWindow(hwnd); } break; case WM_DESTROY: PostQuitMessage(1); break; default: return DefWindowProc(hwnd,uMsg,wParam,lParam); } return 0; }

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