函数名

    //获取保存的文件
    static QString getSaveName(const QString &filter, QString defaultDir = QCoreApplication::applicationDirPath());
    //获取选择的文件
    static QString getFileName(const QString &filter, QString defaultDir = QCoreApplication::applicationDirPath());
    //非阻塞保存文件对话框
    static QString saveFileName(const QString &filter, const QString &defaultDir = "", const QString &fileName = "");
    //获取选择的文件集合
    static QStringList getFileNames(const QString &filter, QString defaultDir = QCoreApplication::applicationDirPath());
    //获取选择的目录
    static QString getFolderName();

    //获取文件名,含拓展名
    static QString getFileNameWithExtension(const QString &strFilePath);
    //获取选择文件夹中的文件
    static QStringList getFolderFileNames(const QStringList &filter);

    //文件夹是否存在
    static bool folderIsExist(const QString &strFolder);
    //文件是否存在
    static bool fileIsExist(const QString &strFile);
    //复制文件
    static bool copyFile(const QString &sourceFile, const QString &targetFile);
    //删除文件夹下所有文件
    static void deleteDirectory(const QString &path);

函数体

QString QUIHelper::getSaveName(const QString &filter, QString defaultDir)
{
    return QFileDialog::getSaveFileName(0, "选择文件", defaultDir, filter);
}

QString QUIHelper::getFileName(const QString &filter, QString defaultDir)
{
    return QFileDialog::getOpenFileName(0, "选择文件", defaultDir, filter);
}

QString QUIHelper::saveFileName(const QString &filter, const QString &defaultDir, const QString &fileName)
{
    QString file;
    QFileDialog dialog;
    dialog.setFixedSize(900, 600);
    dialog.setWindowModality(Qt::WindowModal);
    dialog.setWindowTitle("保存文件");
    dialog.setLabelText(QFileDialog::Accept, "保存(&S)");
    dialog.setLabelText(QFileDialog::Reject, "取消(&C)");
    dialog.selectFile(fileName);
    dialog.setNameFilter(filter);
    dialog.setDirectory(defaultDir);

    if (dialog.exec() == 1) {
        file = dialog.selectedFiles().value(0);
        file = QFileInfo(file).suffix().isEmpty() ? "" : file;
    }

    return file;
}

QStringList QUIHelper::getFileNames(const QString &filter, QString defaultDir)
{
    return QFileDialog::getOpenFileNames(0, "选择文件", defaultDir, filter);
}

QString QUIHelper::getFolderName()
{
    return QFileDialog::getExistingDirectory();
}

QString QUIHelper::getFileNameWithExtension(const QString &strFilePath)
{
    QFileInfo fileInfo(strFilePath);
    return fileInfo.fileName();
}

QStringList QUIHelper::getFolderFileNames(const QStringList &filter)
{
    QStringList fileList;
    QString strFolder = QFileDialog::getExistingDirectory();

    if (!strFolder.length() == 0) {
        QDir myFolder(strFolder);

        if (myFolder.exists()) {
            fileList = myFolder.entryList(filter);
        }
    }

    return fileList;
}

bool QUIHelper::folderIsExist(const QString &strFolder)
{
    QDir tempFolder(strFolder);
    return tempFolder.exists();
}

bool QUIHelper::fileIsExist(const QString &strFile)
{
    QFile tempFile(strFile);
    return tempFile.exists();
}

bool QUIHelper::copyFile(const QString &sourceFile, const QString &targetFile)
{
    bool ok;
    ok = QFile::copy(sourceFile, targetFile);
    //将复制过去的文件只读属性取消
    ok = QFile::setPermissions(targetFile, QFile::WriteOwner);
    return ok;
}

void QUIHelper::deleteDirectory(const QString &path)
{
    QDir dir(path);
    if (!dir.exists()) {
        return;
    }

    dir.setFilter(QDir::AllEntries | QDir::NoDotAndDotDot);
    QFileInfoList fileList = dir.entryInfoList();

    foreach (QFileInfo fi, fileList) {
        if (fi.isFile()) {
            fi.dir().remove(fi.fileName());
        } else {
            deleteDirectory(fi.absoluteFilePath());
            dir.rmdir(fi.absoluteFilePath());
        }
    }
}