Save and Open Files with QFileDialogBox

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Reviewer Approved

ID	...	Creation date	13 July 2009
Platform	S60 5th Edition	Tested on devices	S60 Emulator
Category	Qt for S60	Subcategory	Application

Keywords (APIs, classes, methods, functions): QFileDialog,QFile

Overview

Here is an example code in which we will develop an application. This application will demonstrate how to perform operations like file open , save.

This example makes the use of following classes

QFile - Performs the actual file operations
QFileDialog - Responsible for the FileDialog GUI.

Preconditions

Download and Install latest version Qt for Symbian - Installation packages which has links on how to install the latest version

Mode selection

This property holds the accept mode of the dialog.The action mode defines whether the dialog is for opening or saving files.

QFileDialog *filedialog=new QFileDialog();
dialog->setAcceptMode(QFileDialog::AcceptSave);//To save files,default is open mode.

Source Code

Code to create open dialog Box to load file

void Widget::loadme()//load a specific file
{
    QString filename = QFileDialog::getOpenFileName(this);//getting the file name
    QFile file(filename);
    if (file.open(QIODevice::ReadOnly|QIODevice::Text)) {//if file is already open do nothing
    ui->textEdit->setPlainText(QString::fromUtf8(file.readAll()));
    FilePath = filename;
 
 
}

Code for "Save" and "saveAs" to save file

void Widget::saveme()
{
if(FilePath.isEmpty())
saveFileAs();
else
saveFile(FilePath);
}
void Widget::saveFile(const QString &name) //save the existing file
{
    QFile file(name);
    if (file.open(QIODevice::WriteOnly|QIODevice::Text))
    {
        file.write(ui->textEdit->toPlainText().toUtf8());
    }
}
void Widget::saveFileAs() //save as a new file
{
    FilePath = QFileDialog::getSaveFileName(this);
    if(FilePath.isEmpty())
    return;
    saveFile(mFilePath);
}

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