9.7 QT self-cultivation

Labels: style blog http OS ar file 2014 Div sp

Addition operations implemented by QT:

 
 

  
  
void Widget::on_pushButton_clicked()
  
  
{
  
  
 QString s1 = ui->lineEdit->text();
  
  
 QString s2 = ui->lineEdit_2->text();
  
  
 int sum = s1.toInt(0,10) + s2.toInt(0,10);
  
  
 ui->textEdit->setText(QString::number(sum , 10));
  
  
}
 
 

To open a file window and read the content

 
 

  
  
void Widget::on_pushButton_clicked()
  
  
{
  
  
Qstring filename = qfiledialog: getopenfilename (0, "open ");
  
  

  
  
 if (filename.isEmpty())
  
  
 return;
  
  

  
  
 FILE *fp = fopen(filename.toStdString().data(),"r");
  
  
 if (!fp)
  
  
 return;
  
  

  
  
 char buf[1024];
  
  
 QString str;
  
  
 while (!feof(fp))
  
  
 {
  
  
 fgets(buf , sizeof(buf) , fp);
  
  
 str += buf;
  
  
 }
  
  
 ui->textEdit->setText(str);
  
  
}
 
 

Implements the window for saving files and writes its content

 
 

  
  
void Widget::on_pushButton_2_clicked()
  
  
{
  
  
Qstring filename = qfiledialog: getsavefilename (0, "save ");
  
  
 if(filename.isEmpty())
  
  
 return;
  
  
 FILE *fp = fopen(filename.toStdString().data(),"w");
  
  
 if (!fp)
  
  
 return;
  
  
 const char *str = ui->textEdit->toPlainText().toStdString().data();
  
  
 fputs(str,fp);
  
  
 fclose(fp);
  
  
}
 
 

Use QT to implement your own IDE and easy language
See instructor Zhu's video




From Weizhi note (wiz)

9.7 QT self-cultivation