Qt中的QDialog类是用来生成对话框的类，QFileDialog 类是QDialog的衍生类，主要用来生成打开文件，或是打开文件目录的对话框，或者是保存文件的对话框，下面我们一一来看代码：
1. Load File Dialog
/**
* Button event for Load File button
*/
void QtConfigFile::on_pbLoadFile_clicked() {
QString fileName = QFileDialog::getOpenFileName(this,
tr("Open Configuration File"), "",
tr("Configuration File (*.xml);;All Files (*)"));
}
2. Save File Dialog
/**
* Button event for Save File button
*/
void QtConfigFile::on_pbSaveFile_clicked() {
QString fileName = QFileDialog::getSaveFileName(this,
tr("Save Configuration File"), "",
tr("Configuration File (*.xml);;All Files (*)"));
}
3. Browse Directory Dialog，其中leVideoDir是QLineEdit类的对象名
/**
* Button event for Video Dir Browse button
*/
void QtConfigFile::on_pbVideoDirBrowse_clicked() {
QString directory = QFileDialog::getExistingDirectory(this,
tr("Video Directory"), QDir::currentPath()); if (!directory.isEmpty()) {
ui.leVideoDir->setText(directory);
}
}
QDesktopServices类是针对操作系统的桌面服务应用的类，我们主要用它来打开文件夹：
/**
* Button event for Show Folder button
*/
void QtConfigFile::on_pbShowFolder_clicked() {
QDesktopServices::openUrl( QUrl::fromLocalFile( QDir::currentPath() ) );
}