QWidget::paintEngine: Should no longer be called QPainter::begin: Paint device returned engine == 0, type: 1 其实这个原因很简单,来看看报错的代码: #include"mainwindow.h"#include"ui_mainwindow.h"#include<QPixmap>#include<QPainter>voidMainWindow::paintEvent(QPaintEvent *e) { } MainWindow::...
QWidget::paintEngine: Should no longer be called QPainter::begin: Paint device returned engine == 0, type: 1 以上问题的解决办法就是在绘图事件函数内创建画家基本即可解决,前提是你是想要在父窗口进行图像绘制。 父窗口:绘制图像,需要继承QWidget类然后重写绘图事件,最后在绘图事件函数内创建画家即可。(构造...
Qt绘图时,提示错误QWidget::paintEngine: Should no longer be called,在Qt进行的绘图过程中,提示如下内容,原因是Qt中的绘图只能在paintEvent()中进行如果在其它函数进行绘图,则会提示如下错误
请问 red/green/blue.msb_right , 在哪里修改呢?
opt out:决定退出,不再参与柯林斯英语释义:If you opt out of something, you choose to be no longer involved in it.break the news:公布、告诉消息(通常是坏消息)剑桥英语释义:to tell someone about some important new information:例句:The doctor broke the news to the family that my grandmother had...
Several years ago, when my grandparents were well into their 80s, they were no longer able to care for themselves very well. My grandfather was afraid of leaving the only home they had known for the past 60 years. The idea of having to sell their home and move into a retirement home ...
You should have no problem with reading this language... 阅读这种语言你应该没问题。 柯林斯高阶英语词典 The voters should by now be in no doubt what the parties stand for... 选民们现在应该确切知道各党派的主张了。 柯林斯高阶英语词典 Should I or shouldn't I go to university?... 我该不该...
"Counting on outdated formula, good vs. evil, will not cut it in this age. It will only make the G7 meeting another ceremonial photo-op event," Dubai-based daily Gulf News said in an article titled "Why an outdated G7 is no longer relevant." ...
No longer did I walk aimlessly down the hallways. I found myself enjoying talking with these people as I learned their histories. Why hadn't I realized sooner that volunteer work could enlighten me? Some argue that volunteering and working for change does not help. However, they fail to ...
In our podcast discoverability and listening habits survey, over half of respondents prefer episodes to be between 15 minutes and one hour long. 32% don’t have an episode length preference, 15% prefer episodes to go longer than an hour, and nobody had a preference for shorter (less than ...