sendmessage(WM 为什么该WM_PAINI消息没能让窗口重绘？
\u5982\u4f55\u8ba9\u7a97\u53e3\u91cd\u753b\u2014\u2014Invalidate()\u3001SendMessage(WM_PAINT)\u548cUpdateWindow()@1.Invalidate()\u51fd\u6570\u53ea\u662f\u6807\u8bb0\u7a97\u53e3\u533a\u57df\u9700\u8981\u91cd\u753b\uff0c\u4f46\u4e0d\u610f\u5473\u7740\u7a97\u53e3\u4f1a\u88ab\u76f4\u63a5\u91cd\u753b\u3002\u5b83\u53ea\u4f1a\u5728\u4e0b\u4e00\u4e2aWM_PAINT\u6d88\u606f\u88ab\u63a5\u6536\u5230\u65f6\uff0c\u8c03\u7528OnPaint()\u624d\u88ab\u91cd\u753b\u3002
@3.\u5f53\u7a97\u53e3\u533a\u57df\u5728\u88abInvalidate()\u6389\u540e\uff0c\u5e76\u4e14\u5728WM_PAINT\u6d88\u606f\u63a5\u6536\u5230\u4e4b\u524d\uff0c\u6211\u4eec\u4ecd\u7136\u53ef\u4ee5\u8c03\u7528ValidateRect(NULL)\u6765\u53d6\u6d88\u6389\u8fd9\u6b21\u7a97\u53e3\u91cd\u753b\u3002
@4.\u5f53\u4f60\u9700\u8981\u8ba9\u7a97\u53e3\u5728Invalidate()\u540e\u7acb\u5373\u91cd\u753b\uff0c\u6807\u51c6\u7684\u505a\u6cd5\u5e94\u8be5\u662fInvalidate()\u4e4b\u540e\u9a6c\u4e0a\u8c03\u7528UpdateWindow()\uff0c\u8fd9\u6837\u7a97\u53e3\u4f1a\u7acb\u5373\u628a\u81ea\u5df1\u91cd\u753b\u4e00\u6b21\u3002
@5.UpdateWindow()\u7684\u5b9e\u73b0\u65b9\u5f0f\uff0c\u4ecd\u7136\u662f\u5bf9\u7a97\u53e3\u7684Client area\u53d1\u9001\u4e00\u4e2aWM_PAINT\u6d88\u606f\uff0c\u8fd9\u4e2a\u673a\u5236\u4e5f\u53ef\u4ee5\u7528SendMessage(WM_PAINT)\u505a\u5230\u3002
case WM_PAINT:
HDC hDC;
PAINTSTRUCT ps;
hDC = BeginPaint(hwnd,&ps);
TextOut(hDC,0,50,"www.baidu.com",strlen("www.baidu.com"));
EndPaint(hwnd,&ps);
break;
\u4f60\u5bf9\u6bd4\u770b\u4e0b\u5427\u3002
那么你若想重绘窗口就首先使窗口无效,具体方法,可以使用Invalidate, InvalidateRect(Rect)这两个函数,前者重绘整个窗口,与RedrawWindow功能一样,后者重绘指定的区域(由Rect决定).
送消息没用，必须指定更新区
使用Invalidate, InvalidateRect(NULL).
RedrawWindow(NULL)
更新全部客户区，（当然也可以指定要更新的区域）
sendmessage(WM_PAINT)
只是在内存里画好了
但没有画到视图里，接着要更新窗口，InvalidateRect（hWnd,&rect,true）；
你是老大,你厉害,你竟然敢对窗口发送WM_PAINT?你问过比尔盖兹同意没有?WM_PAINT是你可以随便发的了的吗?
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