main.cpp

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include "cc.h"
 
//建構函式
edit::edit(QWidget *parent):QWidget(parent)
{
setupUi( this );
QObject::connect(this->pushButton, SIGNAL(clicked()), this, SLOT(openfile()));
QObject::connect(this->pushButton_2, SIGNAL(clicked()), this, SLOT(savefile()));
}

//開檔案到textEdit上秀出來
void edit::openfile()
{
//開檔路徑
    QString fileName = QFileDialog::getOpenFileName(this->textEdit, "Open Text File",
                   "C:\\", "Text Files (*.txt *.java *.c *.cpp);;All files (*.*)");
//開檔路徑給QFile    
                   QFile file(fileName); 
//開檔成功才做( QIODevice::ReadOnly 開檔成功傳1)
                    if(file.open(QIODevice::ReadOnly)) {
//把檔名的路徑給標題title     
                      this->setWindowTitle(fileName);
//由於將讀取的是文字檔案，使用QTextStream輔助，可以使用其readAll()方法一次讀進檔案中所有的文字
                       QTextStream stream(&file);    
            textEdit->setText(stream.readAll());
    }
    file.close();
}

//存檔
void edit::savefile()
{
//存檔路徑
    QString fileName = QFileDialog::getSaveFileName(this->textEdit, "Save Text File",
                   "C:\\", "Text Files (*.txt *.java *.c *.cpp);;All files (*.*)");
//路徑檔名給QFile    
                   QFile file(fileName); 
//開啟存檔路徑的檔案來存放 失敗就出現此錯誤訊息
     if (!file.open(QFile::WriteOnly  QFile::Text))
    {
        QMessageBox::warning(this,
                            tr("error"),
                            tr("sorry  %1:\n%2.")
                            .arg(fileName)
                            .arg(file.errorString()));
    }
//開檔成功可寫入時 把檔案給QTextStream  
    QTextStream stream(&file);
    QApplication::setOverrideCursor(Qt::WaitCursor); //以下動作遊標以漏斗表示
    stream <<>toPlainText(); //寫textEdit上的文字存入目標檔案中
    QApplication::restoreOverrideCursor();  //到此結束游標漏斗圖示
}

int main(int argc, char *argv[]) {
  QApplication app(argc, argv); 
  edit *txtedir = new edit; 
  txtedir->show(); 
  return app.exec();
}