} PAINTSTRUCT; 其中hdc字段是窗口的设备环境句柄,rcPaint字段是一个 RECT结构,它指定了无效区域矩形的对角顶点,fErase字段如果为非零值,表示Windows在发送WM_PAINT消息前已经使用背景色擦除了无 效区域,后面3个字段是Windows内部使用的,应用程序不必去理会他们。 摘自《Windows环境下32位汇编语言程序设计》 大多数Windo...
当WM_PAINT不是由InvalidateRect产生时,即由最大化,最小化等产生时,或者移动产生(移动有时只会产生WM_ERASEBKGND消息)系统先发送WM_ERASEBKGND消息,再发送WM_PAINT消息. 如果处理WM_ERASEBKGND消息时返回FALSE,BeginPaint标记pt.fErase 为TRUE,如果处理WM_ERASEBKGND时返回TRUE,BeginPaint标记pt.fErase为FALSE. 当WM...
WM_PAINT hdc = (HDC) wParam;这样,应用程序就可以利用这个设备上下文进行相应的绘图操作,如绘制图形、文字或界面元素,以更新窗口的显示内容。WM_PAINT消息是Windows图形用户界面编程中的重要环节,它确保了窗口的及时刷新和视觉更新。
Sent by an application when Windows or another application makes a request to paint a portion of an application's window.SyntaxKopie WM_PAINT hdc = (HDC) wParam; Parametershdc Handle to the device context (HDC) in which to draw. If this parameter is NULL, use the default device context...
WM_PAINT hdc = (HDC) wParam; Parameters hdc Handle to the device context (HDC) in which to draw. If this parameter is NULL, use the default device context. This parameter is used by some common controls to enable drawing in a device context other than the default device context. ...
hdc = BeginPaint (hwnd, &ps) ;而以一个EndPaint呼叫结束:EndPaint (hwnd, &ps) ;在这两个呼叫中,第一个参数都是程式的视窗代号,第二个参数是指向型态为PAINTSTRUCT的结构指标。PAINTSTRUCT结构中包含一些视窗讯息处理程式,可以用来更新显示区域的内容。我们将在下一章中讨论该结构的各个栏位。现在我们只在...
..所以就发送WM_PAINT:得到HDC后...就用 TextOut(hDC,0,0,"维新培训",strlen("维新培训"));显示所要字符串而ps里就有需要重新绘制区域的位子..ps.rcPaint.left等等四个方位...这里用 TextOut(hDC,0,0,"维新培训",strlen("维新培训"));难道你没有看到么 ...
DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER); EndPaint(hWnd, &ps); break; case WM_DESTROY: PostQuitMessage(0); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0; } 1. 2. 3. 4. 5. ...
WM_PAINT hdc = (HDC)wParam; Parameters hdc Handle to the device context to draw in. If this parameter is NULL, use the default device context. This parameter is used by some common controls to enable drawing in a device context other than the default device context. ...