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深度解析QMap與QHash

1、QMap深度解析

1.1、QMap是一個以升序鍵順序存儲鍵值對的資料結構

（1）QMap原型為class QMap<K, T>模闆

（2）、QMap中的鍵值對根據key進行了排序

（3）、QMap中的key類型必須重載operator < (小于操作符)

1.2、QMap使用執行個體一

深度解析QMap與QHash

1.3、QMap使用執行個體二

深度解析QMap與QHash

1.4、QMap的注意事項

（1）、通過key擷取Value時

A、當key存在，傳回對應的Value

B、當key不存在，傳回值類型所對應的“零”值

（2）、插入鍵值對時

A、當key存在，更新Value的值

B、當key不存在，插入新的鍵值對

#include <QtCore/QCoreApplication>
#include <QDebug>
#include <QMap>
#include<QMapIterator>//疊代器

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    
    QMap<QString, int> map;
    map["key 2"] = 2;
    map["key 0"] = 0;
    map.insert("key 1", 1);

   //map.insert("key 1", 4);//前面已有key 1，所有這裡會更新key的鍵值為4

    QList<QString> list = map.keys();

    for(int i=0; i<list.count(); i++)
    {
        qDebug() << list[i];//列印排序好的key 0、key 1、key 2
    }

    QList<int> vlist = map.values();

    for(int i=0; i<vlist.count(); i++)
    {
        qDebug() << vlist[i];//列印0、1、2
    }



    QMapIterator<QString,int> it(map);//it指向第一個元素之前的位置
    while(it.hasNext())
    {
        it.next();
        qDebug() << it.key() << ":" << it.value() ;
    }


    return a.exec();
}

QMap.cpp

2、QHash深度解析

2.1、QHash是Qt中的哈希資料結構

（1）、QHash原型為class QHash<K, T>模闆

（2）、QHash中的鍵值對在内部無序排列

（3）、QHash中的Key類型必須重載operator ==

（4）、QHash中的Key對象必須重載全局哈希函數（qHash()）

2.2、QHash使用示例

深度解析QMap與QHash
#include <QtCore/QCoreApplication>
#include <QDebug>
#include <QHash>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    
    QHash<QString, int> map;
    map["key 2"] = 2;
    map["key 0"] = 0;
    map.insert("key 1", 1);

   //map.insert("key 1", 4);//前面已有key 1，所有這裡會更新key的鍵值為4

    QList<QString> list = map.keys();

    for(int i=0; i<list.count(); i++)
    {
        qDebug() << list[i];//列印排序好的key 0、key 1、key 2
    }

    QList<int> vlist = map.values();

    for(int i=0; i<vlist.count(); i++)
    {
        qDebug() << vlist[i];//列印0、1、2
    }



    QHash<QString,int>::const_iterator i;

    for(i=map.constBegin(); i!=map.constEnd(); ++i)
    {
        qDebug() << i.key() << ":" << i.value() ;
    }

    return a.exec();
}

QHash.cpp

3、QMap和QHash的對比分析

QMap和QHash的接口相同，可直接替換使用

（1）、QHash的查找速度明顯快于QMap

（2）、QHash占用的存儲空間明顯多于QMap

（3）、QHash以任意的方式存儲元素

（4）、QMap以Key順序存儲元素

（5）、QHash的鍵類型必須提供operator == () 和 qHash(key)函數

（6）、QMap的鍵類型必須提供operator <

自動加入字尾名

QT開發交流+赀料君羊：714620761 
QString MainWindow::showFileDialog(QFileDialog::AcceptMode mode, QString title)
{
    QString ret = "";
    QFileDialog fd;
    QStringList filters;
    QMap<QString, QString> map;

    const char* fileArray[][2]=
    {

        {"Text(*.txt)",    ".txt"},
        {"All Files(*.*)",   "*" },
        {NULL,               NULL}

    };

    for(int i=0; fileArray[i][0] != NULL; i++)
    {
        filters.append(fileArray[i][0]);
        map.insert(fileArray[i][0], fileArray[i][1]);
    }

    fd.setWindowTitle(title);
    fd.setAcceptMode(mode);


    fd.setNameFilters(filters);

    if(mode==QFileDialog::AcceptOpen)
    {
        fd.setFileMode(QFileDialog::ExistingFile);
    }

    if(fd.exec()==QFileDialog::Accepted)
    {
        ret = fd.selectedFiles()[0];

        QString posix = map[fd.selectedNameFilter()];//把下拉中選中的字尾對應鍵值取出

        if(posix != "*" && !ret.endsWith(posix))
        {
            ret += posix;
        }
    }

    return ret;
}

自動加入字尾名

MainWindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMenuBar>
#include <QMenu>
#include <QAction>
#include <QString>
#include <QtGui/QMainWindow>
#include <QToolBar>
#include <QIcon>
#include <QSize>
#include <QStatusBar>
#include <QLabel>
#include <QPlainTextEdit>
#include <QFileDialog>
class MainWindow : public QMainWindow
{
    Q_OBJECT
private:
        QPlainTextEdit mainEdit;
        QLabel statusLabel;
        QString m_filePath;//記得在構造函數裡初始化
        bool m_isTextChanged;//構造函數裡初始化為false

        MainWindow(QWidget *parent = 0);
        MainWindow(const MainWindow& obj);
        MainWindow* operator = (const MainWindow& obj);
        bool construct();

        bool initMenuBar();//菜單欄
        bool initToolBar();//工具欄
        bool initStatusBar();//狀态欄
        bool initinitMainEditor();//編輯視窗

        bool initFileMenu(QMenuBar* mb);//檔案菜單
        bool initEditMenu(QMenuBar* mb);//編輯菜單
        bool initFormatMenu(QMenuBar* mb);//格式菜單
        bool initViewMenu(QMenuBar* mb);//視圖菜單
        bool initHelpMenu(QMenuBar* mb);//幫助菜單

        bool initFileToolItem(QToolBar* tb);//工具選項
        bool initEditToolItem(QToolBar* tb);
        bool initFormatToolItem(QToolBar* tb);
        bool initViewToolItem(QToolBar* tb);


        bool makeAction(QAction*& action,QMenu* menu, QString text, int key);//菜單項
        bool makeAction(QAction*& action,QToolBar* tb, QString tip, QString icon);

        QString showFileDialog(QFileDialog::AcceptMode mode, QString title);//檔案對話框
        void showErrorMessage(QString message);//錯誤消息對話框
        int showQuesstionMessage(QString message);//問題消息對話框
        QString saveCurrentData(QString path = "");
        void preEditorChanged();

private slots:
        void onFileNew();
        void onFileOpen();
        void onFlieSave();
        void onFileSaveAs();
        void onTextChanged();
public:
     static MainWindow* NewInstance();
    ~MainWindow();
};

#endif // MAINWINDOW_H

MainWindow.h

MainWindowUI.cpp

#include "MainWindow.h"
#include <QDebug>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), statusLabel(this)
{
    m_filePath = "";
    m_isTextChanged = false;
    setWindowTitle("NotePad-[New]");
}

bool MainWindow::construct()
{
    bool ret = true;
    ret = ret && initMenuBar();
    ret = ret && initToolBar();
    ret = ret && initStatusBar();
    ret = ret && initinitMainEditor();
    return ret;
}
MainWindow* MainWindow::NewInstance()
{
    MainWindow* ret = new MainWindow();

    if((ret==NULL) || (!ret->construct()))
    {
        delete ret;
        ret = NULL;
    }

    return ret;
}
bool MainWindow::initMenuBar()//菜單欄
{
    bool ret = true;

    QMenuBar* mb = menuBar();//一定要注意是menuBar()，這是普通成員函數，不是構造函數

    ret = ret && initFileMenu(mb);//傳一個參數是為了在initFileMenu()函數将menu加入菜單欄
    ret = ret && initEditMenu(mb);
    ret = ret && initFormatMenu(mb);
    ret = ret && initViewMenu(mb);
    ret = ret && initHelpMenu(mb);

    return ret;

}

bool MainWindow::initToolBar()//工具欄
{
    bool ret = true;

    QToolBar* tb = addToolBar("Tool Bar");
    //tb->setMovable(false);
    //tb->setFloatable(false);
    tb->setIconSize(QSize(16,16));

    ret = ret && initFileToolItem(tb);
    tb->addSeparator();
    ret = ret && initEditToolItem(tb);
    tb->addSeparator();
    ret = ret && initFormatToolItem(tb);
    tb->addSeparator();
    ret = ret && initViewToolItem(tb);

    return ret;
}

bool MainWindow::initStatusBar()//狀态欄
{
    bool ret = true;

    QStatusBar* sb = statusBar();

    QLabel* label = new QLabel("Made By LGC");

    if(label != NULL)
    {
        statusLabel.setMinimumWidth(200);
        statusLabel.setAlignment(Qt::AlignHCenter);
        statusLabel.setText("Ln:1    Col:1");


        label->setMinimumWidth(200);
        label->setAlignment(Qt::AlignHCenter);

        sb->addPermanentWidget(new QLabel());//單純加入分隔符
        sb->addPermanentWidget(&statusLabel);
        sb->addPermanentWidget(label);
    }
    else
    {
        ret = false;
    }
    return ret;
}
bool MainWindow::initinitMainEditor()//編輯視窗
{
    bool ret = true;

    mainEdit.setParent(this);
    setCentralWidget(&mainEdit);

    connect(&mainEdit, SIGNAL(textChanged()), this, SLOT(onTextChanged()));

    return ret;
}

/************************************************檔案菜單********************************************************/
bool MainWindow::initFileMenu(QMenuBar* mb)
{
    bool ret = true;

    QMenu* menu = new QMenu("File(&F)");//建立檔案菜單，（&F）是為了可以Alt+F打開
    ret = (menu != NULL);
    if(ret)
    {
        QAction* action = NULL;

        //New
        ret = ret &&  makeAction(action, menu, "New(&N)",Qt::CTRL + Qt::Key_N);
        if(ret)
        {
           connect(action, SIGNAL(triggered()), this, SLOT(onFileNew()));
           menu->addAction(action);
        }

        menu->addSeparator();

        //Open
        ret = ret &&  makeAction(action,  menu,"Open(&O)...",Qt::CTRL + Qt::Key_O);
        if(ret)
        {
           connect(action, SIGNAL(triggered()), this, SLOT(onFileOpen()));
           menu->addAction(action);
        }

        menu->addSeparator();

        //Save
        ret = ret &&  makeAction(action,  menu,"Save(&S)",Qt::CTRL + Qt::Key_S);
        if(ret)
        {
            connect(action, SIGNAL(triggered()), this ,SLOT(onFlieSave()));
            menu->addAction(action);
        }

        menu->addSeparator();

        //Save As
        ret = ret &&  makeAction(action, menu, "Save As(&A)...",0);
        if(ret)
        {
           connect(action, SIGNAL(triggered()), this, SLOT(onFileSaveAs()));
           menu->addAction(action);

        }

        menu->addSeparator();

        //print
        ret = ret &&  makeAction(action, menu, "Print(&P)...",Qt::CTRL + Qt::Key_P);
        if(ret)
        {
           menu->addAction(action);
        }

        menu->addSeparator();

        //Exit
        ret = ret &&  makeAction(action,  menu,"Exit(&X)",0);
        if(ret)
        {
           menu->addAction(action);//将菜單項加入到菜單
        }

    }
    if(ret)
    {
        mb->addMenu(menu);//将菜單加入到菜單欄
    }
    else
    {
        delete mb;
    }
    return ret;
}

/************************************************編輯菜單********************************************************/
bool MainWindow::initEditMenu(QMenuBar* mb)
{
    bool ret = true;

    QMenu* menu = new QMenu("Edit(&E)");
    ret = (menu != NULL);
    if(ret)
    {
        QAction* action = NULL;

        //Undo
        ret = ret &&  makeAction(action,  menu,"Undo(&U)",Qt::CTRL + Qt::Key_Z);
        if(ret)
        {
           menu->addAction(action);
        }

        menu->addSeparator();

        //Redo
        ret = ret &&  makeAction(action,  menu,"Redo(&R)...",Qt::CTRL + Qt::Key_Y);
        if(ret)
        {
           menu->addAction(action);
        }

        menu->addSeparator();

        //Cut
        ret = ret &&  makeAction(action,  menu,"Cut(&T)",Qt::CTRL + Qt::Key_X);
        if(ret)
        {
           menu->addAction(action);
        }

        menu->addSeparator();

        //Copy
        ret = ret &&  makeAction(action,  menu,"Copy(&C)...",Qt::CTRL + Qt::Key_C);
        if(ret)
        {
           menu->addAction(action);
        }

        menu->addSeparator();

        //Pase
        ret = ret &&  makeAction(action,  menu,"Pase(&P)...",Qt::CTRL + Qt::Key_V);
        if(ret)
        {
           menu->addAction(action);
        }

        menu->addSeparator();

        //Delete
        ret = ret &&  makeAction(action, menu, "Delete(&L)",Qt::Key_Delete);
        if(ret)
        {
           menu->addAction(action);
        }

        menu->addSeparator();

        //Find
        ret = ret &&  makeAction(action,  menu,"Find(&F)...",Qt::CTRL + Qt::Key_F);
        if(ret)
        {
           menu->addAction(action);
        }

        menu->addSeparator();

        //Replace
        ret = ret &&  makeAction(action,  menu,"Replace(&R)...",Qt::CTRL + Qt::Key_H);
        if(ret)
        {
           menu->addAction(action);
        }

        menu->addSeparator();

        //Goto
        ret = ret &&  makeAction(action,  menu,"Goto(&G)",Qt::CTRL + Qt::Key_G);
        if(ret)
        {
           menu->addAction(action);
        }

        menu->addSeparator();

        //Select All
        ret = ret &&  makeAction(action, menu, "Select All(&A)",Qt::CTRL + Qt::Key_A);
        if(ret)
        {
           menu->addAction(action);
        }

    }
    if(ret)
    {
        mb->addMenu(menu);
    }
    else
    {
        delete mb;
    }
    return ret;
}

/************************************************格式菜單********************************************************/
bool MainWindow::initFormatMenu(QMenuBar* mb)
{
    bool ret = true;

    QMenu* menu = new QMenu("Format(&O)");
    ret = (menu != NULL);
    if(ret)
    {
        QAction* action = NULL;

        //Auto Wrap
        ret = ret &&  makeAction(action,  menu,"Auto Wrap(&W)",0);
        if(ret)
        {
           menu->addAction(action);
        }

        menu->addSeparator();

        //Font
        ret = ret &&  makeAction(action,  menu,"Font(&F)...",0);
        if(ret)
        {
           menu->addAction(action);
        }

    }
    if(ret)
    {
        mb->addMenu(menu);
    }
    else
    {
        delete mb;
    }
    return ret;
}

/************************************************視圖菜單********************************************************/
bool MainWindow::initViewMenu(QMenuBar* mb)
{
    bool ret = true;

    QMenu* menu = new QMenu("View(&V)");
    ret = (menu != NULL);
    if(ret)
    {
        QAction* action = NULL;

        //Tool Bar
        ret = ret &&  makeAction(action, menu,"Tool Bar(&T)",0);
        if(ret)
        {
           menu->addAction(action);
        }

        menu->addSeparator();

        //Status Bar
        ret = ret &&  makeAction(action, menu,"Status Bar(&S)",0);
        if(ret)
        {
           menu->addAction(action);
        }

    }
    if(ret)
    {
        mb->addMenu(menu);
    }
    else
    {
        delete mb;
    }
    return ret;
}

/************************************************幫助菜單********************************************************/
bool MainWindow::initHelpMenu(QMenuBar* mb)
{
    bool ret = true;

    QMenu* menu = new QMenu("Help(&H)");
    ret = (menu != NULL);
    if(ret)
    {
        QAction* action = NULL;

        //User Manual
        ret = ret &&  makeAction(action,  menu,"User Manual",0);
        if(ret)
        {
           menu->addAction(action);
        }

        menu->addSeparator();

        //About NotePad
        ret = ret &&  makeAction(action,  menu,"About NotePad...",0);
        if(ret)
        {
           menu->addAction(action);
        }

    }
    if(ret)
    {
        mb->addMenu(menu);
    }
    else
    {
        delete mb;
    }
    return ret;
}
/*****************************************工具************************************************************/
bool MainWindow::initFileToolItem(QToolBar* tb)
{
    bool ret = true;
    QAction* action = NULL;

    ret = ret && makeAction(action, tb, "New", ":/Res/pic/new.png");
    if(ret)
    {
        connect(action, SIGNAL(triggered()), this, SLOT(onFileNew()));
        tb->addAction(action);

    }

    ret = ret && makeAction(action,  tb,"Open", ":/Res/pic/open.png");
    if(ret)
    {
        connect(action, SIGNAL(triggered()), this, SLOT(onFileOpen()));
        tb->addAction(action);
    }

    ret = ret && makeAction(action,  tb,"Save", ":/Res/pic/save.png");
    if(ret)
    {
        connect(action, SIGNAL(triggered()), this ,SLOT(onFlieSave()));
        tb->addAction(action);
    }

    ret = ret && makeAction(action,  tb,"Save As", ":/Res/pic/saveas.png");
    if(ret)
    {
        connect(action, SIGNAL(triggered()), this, SLOT(onFileSaveAs()));
        tb->addAction(action);
    }
    ret = ret && makeAction(action, tb,"Print",  ":/Res/pic/print.png");
    if(ret)
    {
        tb->addAction(action);
    }
    return ret;

}
bool MainWindow::initEditToolItem(QToolBar* tb)
{
    bool ret = true;
    QAction* action = NULL;

    ret = ret && makeAction(action, tb,"Undo",  ":/Res/pic/undo.png");
    if(ret)
    {
        tb->addAction(action);
    }
    ret = ret && makeAction(action,  tb,"Redo", ":/Res/pic/redo.png");
    if(ret)
    {
        tb->addAction(action);
    }

    ret = ret && makeAction(action, tb, "Cut",  ":/Res/pic/cut.png");
    if(ret)
    {
        tb->addAction(action);
    }

    ret = ret && makeAction(action,  tb,"Copy", ":/Res/pic/copy.png");
    if(ret)
    {
        tb->addAction(action);
    }

    ret = ret && makeAction(action, tb,"Paste",  ":/Res/pic/paste.png");
    if(ret)
    {
        tb->addAction(action);
    }

    ret = ret && makeAction(action, tb,"Find",  ":/Res/pic/find.png");
    if(ret)
    {
        tb->addAction(action);
    }
    ret = ret && makeAction(action, tb,"Replace",  ":/Res/pic/replace.png");
    if(ret)
    {
        tb->addAction(action);
    }
    ret = ret && makeAction(action, tb,"Goto",  ":/Res/pic/goto.png");
    if(ret)
    {
        tb->addAction(action);
    }

    return ret;
}
bool MainWindow::initFormatToolItem(QToolBar* tb)
{
    bool ret = true;
    QAction* action = NULL;

    ret = ret && makeAction(action, tb, "Auto Wrap", ":/Res/pic/wrap.png");
    if(ret)
    {
        tb->addAction(action);
    }
    ret = ret && makeAction(action, tb,"Font",  ":/Res/pic/font.png");
    if(ret)
    {
        tb->addAction(action);
    }

    return ret;
}
bool MainWindow::initViewToolItem(QToolBar* tb)
{
    bool ret = true;
    QAction* action = NULL;

    ret = ret && makeAction(action,  tb,"Tool Bar", ":/Res/pic/tool.png");
    if(ret)
    {
        tb->addAction(action);
    }
    ret = ret && makeAction(action,  tb,"Status Bar", ":/Res/pic/status.png");
    if(ret)
    {
        tb->addAction(action);
    }

    return ret;
}


bool MainWindow::makeAction(QAction*& action,QMenu* menu, QString text, int key)//菜單項
{
    bool ret = true;
    action = new QAction(text, menu);
    if(action != NULL)
    {
        action->setShortcut(QKeySequence(key));//建立快捷鍵
    }
    else
    {
        ret = false;
    }

    return ret;
}
bool MainWindow::makeAction(QAction*& action,QToolBar* tb, QString tip, QString icon)
{
    bool ret = true;
    action = new QAction("", tb);
    if(action != NULL)
    {
        action->setToolTip(tip);
        action->setIcon(QIcon(icon));
    }
    else
    {
        ret = false;
    }
    return ret;
}
MainWindow::~MainWindow()
{

}

MainWindowUI.cpp

MainWindowSlots.cpp

#include <QFileDialog>
#include <QStringList>
#include <QFile>
#include <QDebug>
#include <QMessageBox>
#include "MainWindow.h"
#include <QMap>

QString MainWindow::showFileDialog(QFileDialog::AcceptMode mode, QString title)
{
    QString ret = "";
    QFileDialog fd;
    QStringList filters;
    QMap<QString, QString> map;

    const char* fileArray[][2]=
    {

        {"Text(*.txt)",    ".txt"},
        {"All Files(*.*)",   "*" },
        {NULL,               NULL}

    };

    for(int i=0; fileArray[i][0] != NULL; i++)
    {
        filters.append(fileArray[i][0]);
        map.insert(fileArray[i][0], fileArray[i][1]);
    }

    fd.setWindowTitle(title);
    fd.setAcceptMode(mode);


    fd.setNameFilters(filters);

    if(mode==QFileDialog::AcceptOpen)
    {
        fd.setFileMode(QFileDialog::ExistingFile);
    }

    if(fd.exec()==QFileDialog::Accepted)
    {
        ret = fd.selectedFiles()[0];

        QString posix = map[fd.selectedNameFilter()];//把下拉中選中的字尾對應鍵值取出

        if(posix != "*" && !ret.endsWith(posix))
        {
            ret += posix;
        }
    }

    return ret;
}

void MainWindow::showErrorMessage(QString message)
{
    QMessageBox mb(this);

    mb.setWindowTitle("Quession");
    mb.setText(message);
    mb.setIcon(QMessageBox::Critical);
    mb.setStandardButtons(QMessageBox::Ok);

    mb.exec();
}

int MainWindow::showQuesstionMessage(QString message)
{
    QMessageBox mb(this);

    mb.setWindowTitle("Error");
    mb.setText(message);
    mb.setIcon(QMessageBox::Question);
    mb.setStandardButtons(QMessageBox::Yes | QMessageBox::No | QMessageBox::Cancel);

    return  mb.exec();
}

QString MainWindow::saveCurrentData(QString path)
{
    QString ret = path;
    if(ret == "")
    {
        ret = showFileDialog(QFileDialog::AcceptSave, "Save");

    }

    if(ret != "")
    {
        QFile file(ret);
        if(file.open(QIODevice::WriteOnly | QIODevice::Text))
        {
            QTextStream out(&file);

            out << QString(mainEdit.toPlainText());

            file.close();

            setWindowTitle("NotePad - [" + ret + "]");

            m_isTextChanged = false;//儲存後修改狀态值
        }
        else
        {
            showErrorMessage(QString("Open file Error!\n\n") + "\"" + m_filePath + "\"");
            ret = "";
        }
    }

    return ret;

}
void MainWindow::preEditorChanged()
{
    if(m_isTextChanged)
    {
        int r = showQuesstionMessage("Do you want to Save?");
        switch (r)
        {
        case QMessageBox::Yes:
            saveCurrentData(m_filePath);
            break;
        case QMessageBox::No:
            m_isTextChanged = false;
            break;
        case QMessageBox::Cancel:
            break;

        }

    }
}
void MainWindow::onFileNew()
{
    preEditorChanged();
    if(!m_isTextChanged)
    {
        mainEdit.clear();

        m_filePath = "";

        m_isTextChanged = false;

        setWindowTitle("NotePad-[New]");
    }
}
void MainWindow::onFileOpen()
{

    preEditorChanged();

    if(!m_isTextChanged)
    {
        QString path = showFileDialog(QFileDialog::AcceptOpen, "open");

        if(path != "")
        {
            QFile file(path);
            if(file.open(QIODevice::ReadOnly | QIODevice::Text))
            {
                mainEdit.setPlainText(QString(file.readAll()));

                file.close();

                m_filePath = path;//報存目前檔案路徑

                setWindowTitle("NotePad - [" + m_filePath + "]");
            }
            else
            {
                showErrorMessage(QString("Open file Error!\n\n") + "\"" + m_filePath + "\"");
            }
        }
    }

}

void MainWindow::onFlieSave()
{
    QString path = saveCurrentData(m_filePath);

    if(path != "")
    {
        m_filePath = path;
    }
}

void MainWindow::onFileSaveAs()
{
    QString path = saveCurrentData();//使用預設參數

    if(path != "")
    {
        m_filePath = path;
    }

}
void MainWindow::onTextChanged()
{
    if(!m_isTextChanged)
    {
        setWindowTitle("*" + windowTitle());
    }
    m_isTextChanged = true;

}

MainWindowSlots.cpp

main.cpp

#include <QtGui/QApplication>
#include "MainWindow.h"
#include <QTextCodec>


int main(int argc, char *argv[])
{
    QTextCodec::setCodecForLocale(QTextCodec::codecForName("GBK")); //路徑名支援中文
    QTextCodec::setCodecForTr(QTextCodec::codecForName("GBK")); //QString支援中文
    QTextCodec::setCodecForCStrings(QTextCodec::codecForName("GBK")); //string支援中文
    QApplication a(argc, argv);
    MainWindow* w = MainWindow::NewInstance();
    int ret = -1;
    if(w != NULL)
    {
        w->show();
        ret = a.exec();
    }

    delete w;
    return ret;
}

main.cpp

小結

（1）、Qt中提供了用于存儲鍵值的類模闆

（2）、QHash與QMap遵循了相同的使用接口

（3）、QHash的查找速度快于QMap

（4）、QMap需要的記憶體少于QHash

（5）、QHash對于Key類型的要求高于QMap

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