Use of progress bar in QT

In Qt, you can use Qprogressbar or Qprogressdialog to achieve a progress bar.

Use of Qprogressbar

First drag a button and a progress bar widget in the designer and initialize it as follows

Add: The following two sentences are written in the MainWindow constructor.

ui->progressBar->setRange(0,50000-1); 

UI->progressbar->setvalue(0);

Event handling for the button:

void MainWindow:: on_pushbutton_clicked   

{
For  (int i=0; I<50000; I     

 　　For(int J=0; J<20000; J        

  UI->progressbar->setvalue(i    

This will show the progress bar, which calculates the percentage automatically and shows

How to use Qprogressdialog

The use of Qprocessdialog is similar, except that it is displayed as a dialog box, and it also provides a Cancel button to cancel the operation. Qprocessdialog will automatically calculate that percentage and display it.

void MainWindow:: on_pushbutton_clicked   

Qprogressdialog Process(     This

Process. Setlabeltext(tr("Processing ..."      )

Process. SetRange(0,50000      

Process. Setmodal(true);   

Process. Setcancelbuttontext(tr("Cancel"));    

For(int i=0; I<50000; I       

 　　For(int J=0; J<20000; J         

Process. SetValue(i   

 　　If(Process. wascanceled   

 　　　　Break

Transferred from:http://blog.sina.com.cn/s/blog_6151770b0100ndle.html
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Use of progress bar in QT