QT记事本的读写函数

#include<QtDebug>

#include<QFile>

#include<QFileDialog>

#include<QDir>

#include<QTextStream>

私有数据成员：

QStringfileString;//数据成员，保存要打开的文件名

构造函数添加的信号与槽链接：

QObject::connect(ui->openAction,SIGNAL(triggered()),this,SLOT(openFileSlot()));//记事本的打开(O)信号与槽进行连接，openAction是打开(O)的对象名

QObject::connect(ui->saveAction,SIGNAL(triggered()),this,SLOT(saveFileSlot()));//记事本的保存(S)信号与槽进行连接，saveAction是保存(S)的对象名

函数：

{

fileName=QFileDialog::getOpenFileName(this,"OpenFile",QDir::currentPath());//获取要打开文件的绝对路径

if(fileName.isEmpty())//判断是否为空

{

QMessageBox::information(this,"ERRORMESSAGE","Pleaseseleteafile");

return;

}

QFile*file=newQFile;

file->setFileName(fileName);

boolok=file->open(QIODevice::ReadOnly);//以只读方式打开文件

if(ok)

{

QTextStreamin(file);

ui->textEdit->setText(in.readAll());//读取文件所有内容

file->close();

deletefile;

}

else

{

QMessageBox::warning(this,"ERRORMESSAGE","FileOpenFiLE"+file->errorString());

return;

}

}

voidMainWindow::saveFileSlot()

{

if(fileName.isEmpty())

{

QMessageBox::warning(this,"ERRORMESSAGE","Pleaseseleteafile");

return;

}

else

{

QFile*file=newQFile;

file->setFileName(fileName);

boolok=file->open(QIODevice::WriteOnly);

if(ok)

{

QTextStreamout(file);

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

file->close();

deletefile;

}

else

{

QMessageBox::information(this,"ERRORMESSAGE","savefileerror");

return;

}

}

}