==========2017年10月12日更新==========

最近在做安装包，看到qt-installer-framework源码里有相关源代码，以后删除文件夹就可以直接照搬这个了

void removeFiles(const QString &path, bool ignoreErrors){    const QFileInfoList entries = QDir(path).entryInfoList(QDir::AllEntries | QDir::Hidden);    foreach (const QFileInfo &fi, entries) {        if (fi.isSymLink() || fi.isFile()) {            QFile f(fi.filePath());            if (!f.remove()) {                const QString errorMessage = QCoreApplication::translate("QInstaller",                    "Cannot remove file \"%1\": %2").arg(                            QDir::toNativeSeparators(f.fileName()), f.errorString());                qWarning()<< errorMessage;            }        }    }}static QString errnoToQString(int error){#if defined(Q_OS_WIN) && !defined(Q_CC_MINGW)    char msg[128];    if (strerror_s(msg, sizeof msg, error) != 0)        return QString::fromLocal8Bit(msg);    return QString();#else    return QString::fromLocal8Bit(strerror(error));#endif}void removeDirectory(const QString &path, bool ignoreErrors){    if (path.isEmpty()) // QDir("") points to the working directory! We never want to remove that one.        return;    QStringList dirs;    QDirIterator it(path, QDir::NoDotAndDotDot | QDir::Dirs | QDir::NoSymLinks | QDir::Hidden,        QDirIterator::Subdirectories);    while (it.hasNext()) {        dirs.prepend(it.next());        removeFiles(dirs.at(0), ignoreErrors);    }    QDir d;    dirs.append(path);    removeFiles(path, ignoreErrors);    foreach (const QString &dir, dirs) {        errno = 0;        if (d.exists(path) && !d.rmdir(dir)) {            const QString errorMessage = QCoreApplication::translate("QInstaller",                "Cannot remove directory \"%1\": %2").arg(QDir::toNativeSeparators(dir),                                                          errnoToQString(errno));            if (!ignoreErrors)                qWarning()<< errorMessage;        }    }}

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查过资料好像Qt和windows都没有这样一个接口能直接删除一个不为空的目录。

自己实现了一个，采用递归，估计目录太深堆栈就爆掉了吧

void deleteDir(const QString &d){    QDir dir(d);    foreach (QFileInfo inf, dir.entryInfoList(QDir::Dirs|QDir::Files)) {        if(inf.isFile())            dir.remove(inf.absoluteFilePath());        else if(inf.isDir() &&                inf.fileName() != "." &&                inf.fileName() != "..")            deleteDir(inf.absolutePath()+"/"+inf.fileName());    }    dir.rmdir(dir.absolutePath());}