根據(jù)QT記事本源代碼

1、基于 QT 記事本源代碼dialog.h#ifndef#define#include <QDialog>Dialog ;classQDialog : public QDialog_OBJECT#include "mainwindow.h"DIALOG_HDIALOG_Hnamespace Ui class public :explicit Dialog ( QWidget *parent = 0); Dialog ();privateslots :voidon_buttonBox_clicked( QAbstractButtonvoidon_pushButton

2、_clicked();voidon_pushButton_2_clicked();voidon_pushButton_3_clicked();private :Ui: ;Dialog *ui ;#endif / DIALOG_Hmainwindow.h#ifndef MAINWINDOW_H#defineMAINWINDOW_H#include<QMainWindow>#include<QFileDialog>#include<QFile>#include<QDir>*button);#include <QMessageBox>#in

3、clude<QTextStream>#include<QFont>#include<QFontDialog>#include<QColor>#include<QColorDialog>#include<QDateTime>#include<QDesktopServices>#include<QUrl>namespace Ui class MainWindow;classQMainWindow : public QMainWindow_OBJECTprivate : Ui:privatepublic

4、: explicit MainWindow( QWidget *parent = 0); MainWindow();voidnewFileSlot(); / nfs()voidopenFileSlot(); / open a textfilevoidsaveFileSlot();voidsetColorSlot();voidsetFontSlot();voidsetDateTimeSlot();voidaboutSoftSlot();voidaboutWebSiteSlot();voidon_actionAa_destroyed( QObject*arg1);voidon_actionS_4_

5、triggered();voidon_actionAa_triggered();voidon_actionA_triggered();MainWindow * ui ; slots :;#endif /MAINWINDOW_Hnew_datebase.h#ifndef NEW_DATEBASE_H#defineNEW_DATEBASE_#include"QWidget"#include"qsql.h"#include"QSqlDatabase"#include"QSqlQuery"#include"QSq

6、lQueryModel"#include"QDebug"#include<QDialog>#include"QSqlDriver"Hnew_datebase;namespace Ui class classQnew_datebase : public QDialog_OBJECTpublic : explicit new_datebase( QWidget *parent = 0); new_datebase();privatevoidslots :on_pushButton_clicked();voidon_lineEdit_ed

7、itingFinished();private : Ui: bool ;new_datebase *ui ; connectDB();#endif / NEW_DATEBASE_H dialog.cpp#include "new_datebase.h" "dialog.h" "mainwindow.h" "ui_dialog.h""QtSql"#include#include#include #include#include<cstdlib>Dialog :Dialog( QWidg

8、et *parent)QDialog (parent),ui (new Ui: Dialog ) ui ->setupUi( this ); Dialog : Dialog () delete ui ;void Dialog :on_pushButton_clicked() MainWindow *m = new MainWindow(); m->show();void Dialog :on_pushButton_2_clicked()QSqlDatabase database = QSqlDatabase:addDatabase( "QSQLITE");dat

9、abase.setDatabaseName( "C:UsersAdministratorDesktoptext/aaa .db" ); / 必須用絕對路徑，不知道為什么database.open();QSqlQuery query;QString ss,qq,s,q; q = ui ->lineEdit_2 ->text();query.exec( "select * from bb where 賬號 = "+ ui -> lineEdit ->text() );query.next();qq = query.value( 1).

10、toString().trimmed(); qDebug()<<qq;if (q != NULL&& q = qq)new_datebase *m = new new_datebase; m->show();#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #includedatabase.close();void Dialog :on_pus

11、hButton_3_clicked() this ->close();main.cpp#include "dialog.h" "mainwindow.h" <QApplication> "qsqlquery.h" "QDebug" "QSqlDatabase" "iostream" "QList" "iostream" "windows.h" "shellapi.h" "

12、;QSqlDriver" "QDebug" "QSqlQueryModel" "QSqlQuery" "qsql.h" "QWidget"using namespace std ;int main( int argc, char *argv) QApplication a(argc, argv);MainWindow w;w.show();QSqlQueryModel *model = new QSqlQueryModel;QSqlDatabase db = QSqlDatabase:

13、addDatabase( "QSQLITE"); db.setDatabaseName( "C:UsersAdministratorDesktopnew one/textfile.db" );bool ku = db.open();Widge w;if (ku) model->setQuery( "select * from textfile" ); model->setQuery( "insert int student values(1,'a" ); w.show();elseqDebug(

14、)<< "abcd" ;return a.exec();mainwindow.cpp#include "new_datebase.h" "dialog.h" "mainwindow.h" "ui_mainwindow.h" "QtSql""string""QtGui""qfile.h"#include #include #include #include #include #include #includ

15、eMainWindow:MainWindow(QWidget *parent) QMainWindow(parent), ui( new Ui:MainWindow)ui->setupUi( this );QObject:connect(ui->actionSs, ot();SIGNAL(triggered(), this , SLOT(newFileSlQObject:connect(ui->actionSs_2, eSlot();SIGNAL(triggered(), this , SLOT(openFilQObject:connect(ui->actionA, o

16、t();SIGNAL(triggered(), this , SLOT(saveFileSlQObject:connect(ui->actionSs_8,);SIGNAL(triggered(), this , SLOT(close()SLOTQObject:connect(ui->actionSs_5,(copy();SIGNAL(triggered(),ui->textEdit,SLOTQObject:connect(ui->actionSs_4,(undo();SIGNAL(triggered(),ui->textEdit,SLOTQObject:conne

17、ct(ui->actionSs_9, (paste();SIGNAL(triggered(),ui->textEdit,SIGNAL(triggered(),ui->textEdit,SLOT(QObject:connect(ui->actionS_2, selectAll();SLOQObject:connect(ui->actionSs_10,T(cut();SIGNAL(triggered(),ui->textEdit,QObject:connect(ui->actionSdf, lot();SIGNAL(triggered(),this , S

18、LOT(setFontSQObject:connect(ui->actionS_3, nAa_destroyed();SIGNAL(triggered(),this , SLOT(on_actio/set current date timeslotQObject:connect(ui->actionS, eSlot();SIGNAL(triggered(),this , SLOT(setDateTimQObject:connect(ui->actionSs_12, SIGNAL(triggered(), this , SLOT(aboutS oftSlot();QObject

19、:connect(ui->actionAa, SIGNAL(triggered(), this , SLOT(aboutSoft Slot();/QObject:connect(ui->aboutQtAction,SIGNAL(triggered(),qApp,SLOT(ab outQt();/ QObject:connect(ui-> 編輯,SIGNAL(triggered(),ui->textEdit,SLOT(redo();MainWindow:MainWindow()delete ui;void MainWindow:newFileSlot()/clear th

20、e text edit ui->textEdit->clear();this ->setWindowTitle( "untitlednotepad");void MainWindow:openFileSlot()QString fileName=QFileDialog:getOpenFileName( this , "Open Text File" ,QDir:currentPath();if (fileName.isEmpty()return ;QFile *file =new QFile; file->setFileName(

21、fileName);/booleanbool ok=file->open(QIODevice:ReadOnly);/if file open errorif (ok)QTextStream in(file); ui->textEdit->setText(in.readAll();file->close(); delete file; file=NULL;elseQMessageBox:information( this , "Error Message", "Can't openFile" );delete file; r

22、eturn ;void MainWindow:saveFileSlot()QString fileName=QFileDialog:getSaveFileName( this , "Save Text File" ,QDir:currentPath();if (fileName.isEmpty()return ;QFile *file =new QFile;/must set a file name file->setFileName(fileName);bool ok=file->open(QIODevice:WriteOnly); if (ok)QTextS

23、tream out(file);out<<ui->textEdit->toPlainText();file->close();delete file;file=NULL;elseQMessageBox:information( this , "Error Message" , "Save File Error");delete file; file=NULL; return ;void MainWindow:setFontSlot()bool ok;QFont font = QFontDialog:getFont(10),

24、this );&ok, QFont("Helvetica Cronyx" ,if(ok)ui->textEdit->setFont(font); / elsethe user clicked OKand font is set to the fontthe user selectedFont" );the user canceled the dialog; font is set value, in this case Helvetica Cronyx,/QMessageBox:information( this , "Error M

25、essage", "Please Select areturnto the initial10void MainWindow:setColorSlot()/* QColor color;if (native->isChecked()color = QColorDialog:getColor(Qt:green, elsecolor = QColorDialog:getColor(Qt:green, QColorDialog:DontUseNativeDialog);this);this, "Select Color",if(color.isValid

26、() colorLabel->setText((); colorLabel->setPalette(QPalette(color); colorLabel->setAutoFillBackground(true);*/QColor color=QColorDialog:getColor(Qt:green,this );if (color.isValid()ui->textEdit->setTextColor(color); elsecorrectQMessageBox:information( this , "Error messag

27、e", "Please Select color" ); return ;void MainWindow:setDateTimeSlot()QDateTime current=QDateTime:currentDateTime(); ui->textEdit->append(current.toString( "yyyy-MM-dd hh-mm-ss");void MainWindow:aboutWebSiteSlot()QDesktopServices:openUrl(QUrl( "" );void MainW

28、indow:on_actionS_4_triggered()Dialog * m= new Dialog; m->show();void MainWindow:on_actionA_triggered()QString sFilePath = "D:test.txt"QFile file(sFilePath);/ if方式：Append 為追加，WriteO niy , Read On ly(!file.open(QIODevice:WriteOnly|QIODevice:Text)QMessageBox:critical(NULL, "提示",

29、" 無法創(chuàng)建文件 ");QTextStream out(&file); out<<" 要寫入內(nèi)容 "<<endl; out.flush();file.close();/*QSqlDatabase db = QSqlDatabase:addDatabase("QSQLITE"); / 添加數(shù) 據(jù)庫驅動db.setDatabaseName("C:UsersAdministratorDesktoptext/aaa.db"); / 數(shù)據(jù)庫連接命名if(!db.open() /QSqlQuer

30、y query;query.exec("selectquery.exec("insert打開數(shù)據(jù)庫* from bb ");into textfile values(1,q,1456)");file.close();*/new_datebase.cpp#include "new_datebase.h"#include"dialog.h"#include"mainwindow.h"#include"new_datebase.h"#include"ui_new_date

31、base.h"#include"QtSql"#include"QFile"#include"QtGui"#include<cstdlib>#include"QSqlDatabase"#include"iostream"#include"QList"#include"iostream"#include"windows.h"#include"shellapi.h"bool connectDB() Q

32、SqlDatabase db = QSqlDatabase:addDatabase( "QSQLITE"); db.setDatabaseName( "textfile.txt");if (!db.open() return false ;elsereturn true ;new_datebase:new_datebase( QWidget *parent) : QDialog (parent), ui (new Ui: new_datebase)ui ->setupUi( this ); QSqlDatabase db = QSqlDatabas

33、e:addDatabase( "QSQLITE"););db.setDatabaseName( "C:UsersAdministratorDesktoptext/aaa.db" db.open();QSqlQuery query;while (query.next()QString name=query.value( 0).toString();QString ppth = query.value( 1).toString();QString Num= query.value( 2).toString();QListWidgetItem *q =new

34、QListWidgetItem(name);QListWidgetItem *v =new QListWidgetItem(ppth);QListWidgetItem *b =new QListWidgetItem(Num); ui ->listWidget->addItem(q);ui ->listWidget->addItem(v);ui ->listWidget->addItem(b);QList <QListWidgetItem*> list=ui ->listWidget->selectedItems();if (list.size()!= 0)QListWidgetItem* sel = list 0;if (sel)/ui->lineEdit_xm->setText