1、用到了QDir QDirIterator遞歸文件目錄

2、QTextStream以某種編碼格式讀取文本保存到QString，然后以另一種編碼格式保存文本

3、界面很簡單，如下：

#include "widget.h"#include "ui_widget.h"#include <QFile>#include <QFileInfo>#include <QTextCodec>#include <QTextStream>#include <QDir>#include <QDirIterator>#include <QFileDialog>Widget::Widget(QWidget *parent) :QWidget(parent),    ui(new Ui::Widget){    ui->setupUi(this);    // 添加編碼    QStringList items;    items << "UTF-8"<<"GBK";    ui->comboBoxCodecSource->clear();    ui->comboBoxCodecDest->clear();    ui->comboBoxCodecSource->addItems(items);    ui->comboBoxCodecSource->setCurrentText("GBK");    ui->comboBoxCodecDest->addItems(items);    ui->comboBoxCodecDest->setCurrentText("UTF-8");    m_strTrPath = "";//目錄路徑}Widget::~Widget(){    delete ui;}void Widget::on_btnPRoject_clicked(){    static QString strDir = "d:/";//初始目錄    strDir = QFileDialog::getExistingDirectory(this, tr("選擇目錄"),                                               strDir,                                               QFileDialog::ShowDirsOnly |                                               QFileDialog::DontResolveSymlinks);    // 選擇工程目錄    if (!strDir.isEmpty())    {        m_strTrPath = strDir;        ui->labelStatus->setText(QString("選擇目錄[%1]").arg(strDir));    }    else        strDir = "d:/";}void Widget::on_btnChange_clicked()//點擊開始轉換按鈕{    QDir dir (m_strTrPath);    QDirIterator dirIterator(m_strTrPath,                             QDir::AllDirs | QDir::NoSymLinks | QDir::NoDotAndDotDot,                             QDirIterator::Subdirectories);    ui->textBrowser->clear();   do  {        QStringList filters;        filters << "*.pro" << "*.cpp" << "*.h";        dir.setPath(m_strTrPath);        ui->textBrowser->append(QString("<span style=/" color:#FF0000;/">進入目錄:</span> [ %1 ] <br>").arg(m_strTrPath));        // 轉換文件        foreach (QFileInfo fileInfo, dir.entryInfoList(filters))            changeTextcodec(fileInfo.absoluteFilePath()); // 轉換編碼    } while (dirIterator.hasNext()&&(m_strTrPath = dirIterator.next())!="");}void Widget::changeTextcodec(QString fileName)//改變文本編碼的關鍵代碼，fileName是帶路徑的文件名{    QFile fileRead(fileName);    fileRead.open(QIODevice::ReadOnly);    QTextStream out(&fileRead);    //這一句需要知道文本當前的編碼格式    out.setCodec(QTextCodec::codecForName(ui->comboBoxCodecSource->currentText().toLatin1()));    out.setAutoDetectUnicode(true);    QString strTemp;    QStringList strContents;    while (!out.atEnd()) {        strTemp = out.readLine();        strContents << strTemp;    }    fileRead.close();    QFile fielWrite(fileName);    if (!fielWrite.open(QIODevice::ReadWrite | QIODevice::Text | QIODevice::Truncate)) {        ui->labelStatus->setText("文件打開失敗!");        return;    }    QTextStream in(&fielWrite);    in.setCodec(QTextCodec::codecForName(ui->comboBoxCodecDest->currentText().toLatin1()));    in.setAutoDetectUnicode(true);    for (int i = 0; i < strContents.size(); i++)        in << strContents.at(i) << endl;    fielWrite.close();    ui->textBrowser->append(QString("<span style=/" color:#0000FF;/">轉換完成:</span> [ %1 ] <br>").arg(fileName));}代碼下載地址：http://download.csdn.net/detail/bladeandmaster88/9747442