对话框无法重新绘制

本文介绍了对话框无法重新绘制的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

你好， 请原谅下面的代码.我现在只是在骇客. 我有一个问题，基本上下面的代码显示3张图像. 第一个图像显示背景，其余两个较小的图像是简单徽标.它呈现的很好，但是当我拖动对话框时.无法重新绘制背景吗? 有人会这么友善并启发我解决这个问题以及如何解决它.我的记忆确实不好. 谢谢， 加里克

Hello, Please excuse the code below. I''m just hacking at the moment. I have a question, essentially the below code displays 3 images. The 1st image displays the background, and the remaining 2 smaller images are simple logos. It renders fine, however when I drag the dialog box. It fails to re-paint the background? Could somebody be so kind and enlighten me on this problem and how to resolve it. My memory is indeed bad. Thanks, Garyc

void CtesterDlg::OnPaint() { CPaintDC dc( this ); // Device context for painting CBitmap bmp, *poldbmp; CDC memdc; // Load the bitmap resource bmp.LoadBitmap(IDB_BITMAP1); // Create a compatible memory DC memdc.CreateCompatibleDC( &dc ); // Select the bitmap into the DC poldbmp = memdc.SelectObject( &bmp ); // Copy (BitBlt) bitmap from memory DC to screen DC dc.BitBlt(0, 0,2000,4000, &memdc, 0, 0, SRCCOPY ); // Copy (BitBlt) bitmap from memory DC to screen DC memdc.SelectObject( poldbmp ); // Load the bitmap resource bmp.LoadBitmap(IDB_BITMAP2); // Create a compatible memory DC memdc.CreateCompatibleDC( &dc ); // Select the bitmap into the DC poldbmp = memdc.SelectObject( &bmp ); // Copy (BitBlt) bitmap from memory DC to screen DC dc.BitBlt(20,320,400,400, &memdc, 0, 0, SRCCOPY ); memdc.SelectObject( poldbmp ); // Load the bitmap resource bmp.LoadBitmap(IDB_BITMAP3); // Create a compatible memory DC memdc.CreateCompatibleDC( &dc ); // Select the bitmap into the DC poldbmp = memdc.SelectObject( &bmp ); // Copy (BitBlt) bitmap from memory DC to screen DC dc.BitBlt(550,320,450,6000, &memdc, 0, 0, SRCCOPY ); }

推荐答案

:) 启示1:每次使用后尝试memdc.DeleteDC() 启蒙0:我们应该尝试通过调试(行，堆栈，var，regs ...)来分析每个断言/异常. :) Enlightenment 1: Try memdc.DeleteDC() after its each usage Enlightenment 0: We should try to analyze every assertion/exception by debugging (line, stack, vars, regs...)

尝试刷新对话框. CDialog :: Invalidate(1); CDialog :: UpdateWindow(); try refreshing the dialog box. CDialog::Invalidate(1); CDialog::UpdateWindow();