如何让程序等待一段时间
QTime t;
t.start();
while(t.elapsed()<1000);
这种死循环也是一种常见错误用法。但改成正确的还是比较简单的:
QTime t;
t.start();
while(t.elapsed()<1000)
QCoreApplication::processEvents();
QProgressDialog *progressDialog=new QProgressDialog(this);
QFont font("ZYSong18030",12);
progressDialog->setFont(font);
progressDialog->setWindowModality(Qt::WindowModal);
progressDialog->setMinimumDuration(5);
progressDialog->setWindowTitle(tr("Please Wait"));
progressDialog->setLabelText(tr("Copying..."));
progressDialog->setCancelButtonText(tr("Cancel"));
progressDialog->setRange(0,num); //num表示要传输的文件个数
for(int i=1;i<num+1;i++)
{
progressDialog->setValue(i);
QApplication::processEvents();
if(progressDialog->wasCanceled())
return;
}
ProgressDialog->show();