hWnd:窗口句柄 lpPaint:包含了用来重画客户区的程序信息 typedefstructtagPAINTSTRUCT { HDC hdc;//用来在客户去画图的设备表BOOL fErase;//客户背景区是否需要重绘(stru=是)RECT rcPaint;//无效客户区BOOL fRestore;//保留BOOL fIncUpdate;//保留BYTE rgbReserved[16];//保留} PAINTSTRUCT; 前面3段代码主要围绕...
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。
在Windows图形编程中，处理WM_PAINT消息通常需要从一个BeginPaint函数开始，调用如下：`hdc = BeginPaint(hwnd, &ps);` 这里，`hwnd` 是程序窗口的句柄，`&ps` 是指向PAINTSTRUCT结构的指针，它包含了处理消息所需的必要信息。我们会在后续章节深入探讨这个结构。在BeginPaint中，Windows会自动处理显示区域...
HDC hdc; hdc = GetDCEx(hwnd, (HRGN)wParam, DCX_WINDOW|DCX_INTERSECTRGN); // Paint into this DC ReleaseDC(hwnd, hdc); } 四、PAINTSTRUCT结构体 The PAINTSTRUCT structure contains information for an application. This information can be used to paint the client area of a window owned by that...
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...
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. ...
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. ...
ReleaseDC(hwnd, hdc); } 四、PAINTSTRUCT结构体 The PAINTSTRUCT structure contains information for an application. This information can be used to paint the client area of a window owned by that application. typedef struct tagPAINTSTRUCT {
WM_PAINT hdc = (HDC) wParam; Parametershdc 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. Other windows can safe...