WM_PAINT多次批注化吗？
[英]WM_PAINT Bitblitting multiple times?
问题描述
This is for C++ - win32. 
这是用于C ++-win32。 Basically I've loaded an image (bmp) into a HBITMAP from a file and bitblitted it to the device context for the main window. 基本上，我已经从文件将图像（bmp）加载到HBITMAP中，并将其位图化为主窗口的设备上下文。
How would I call it again in case I want to change the image? 如果要更改图像，我又怎么称呼它？
I've called InvalidateRectangle() and UpdateWindow() but that causes the window controls to flicker. 我已经调用了InvalidateRectangle（）和UpdateWindow（），但这会导致窗口控件闪烁。
1 个解决方案
解决方案1
2 已采纳 2013-01-16 20:35:22
Normally you invalidate the area (eg via InvalidateRect ) and let your WM_PAINT handler repaint it. 通常，您使该区域无效（例如，通过InvalidateRect ），并让您的WM_PAINT处理程序重新绘制该区域。 Reasons why you would get flicker often are because you haven't overridden the WM_ERASEBKGND handler, your WM_PAINT handler isn't doing double-buffered painting, or you're invalidating (or repainting) an area larger than you need to. 之所以经常出现闪烁，是因为您没有覆盖WM_ERASEBKGND处理程序， WM_PAINT处理程序没有进行双缓冲绘画，或者使（或重新绘画）了一个超出所需范围的区域。
This page might help: Flicker-free Drawing: Techniques to eliminate flicker from your applications 此页面可能会有所帮助：无闪烁绘图：消除应用程序闪烁的技术
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.