QT記事本的讀寫函數

頭文件：

#include <QMessageBox>

#include <QtDebug>

#include <QFile>

#include <QFileDialog>

#include <QDir>

#include <QTextStream>

私有數據成員：

QString fileString;//數據成員，保存要打開的文件名

構造函數添加的信號與槽連接：

QObject::connect(ui->openAction,SIGNAL(triggered()),this,SLOT(openFileSlot()));//記事本的打開(O)信號與槽進行鏈接，openAction是打開(O)的對象名

QObject::connect(ui->saveAction,SIGNAL(triggered()),this,SLOT(saveFileSlot()));//記事本的保存(S)信號與槽進行鏈接，saveAction是保存(S)的對象名

函數：

oid MainWindow::openFileSlot()

{

fileName = QFileDialog::getOpenFileName(this,"Open File",QDir::currentPath());//獲取要打開文件的絕對路徑

if (fileName.isEmpty())//判斷是否爲空

{

QMessageBox::information(this,"ERROR MESSAGE","Please selete a file");

return;

}

QFile *file = new QFile;

file->setFileName(fileName);

bool ok = file->open(QIODevice::ReadOnly);//以只讀方式打開文件

if (ok)

{

QTextStream in(file);

ui->textEdit->setText(in.readAll());//讀取文件全部內容

file->close();

delete file;

}

else

{

QMessageBox::warning(this,"ERROR MESSAGE","File Open FiLE"+file->errorString());

return;

}

}

void MainWindow::saveFileSlot()

{

if (fileName.isEmpty())

{

QMessageBox::warning(this,"ERROR MESSAGE","Please selete a file");

return;

}

else

{

QFile *file = new QFile;

file->setFileName(fileName);

bool ok = file->open(QIODevice::WriteOnly);

if (ok)

{

QTextStream out(file);

out << ui->textEdit->toPlainText();

file->close();

delete file;

}

else

{

QMessageBox::information(this,"ERROR MESSAGE","save file error");

return;

}

}

}