* Qt Remove Directory and Its Contents

Posted on June 8th, 2010 by John. Filed under programming.


When dealing with directories, Qt has a large number of functions to make manipulating them easy. However, it does not include a way to delete a non-empty directory. This little omission is easily solved.

Following is a recursive function that will delete a directory along with all of it’s contents. This will delete depth first. Meaning it will recurse into sub-directories and only start deleting once the directory has no sub-directories. Changing QDir::DirsFirst to QDir::DirsLast will change this into a breadth first search.

fileutils.h

#ifndef FILEUTILS_H
#define FILEUTILS_H
 
#include <QString>
 
class FileUtils
{
public:
    static bool removeDir(const QString &dirName);
};
 
#endif // FILEUTILS_H

fileutils.cpp

#include <QDir>
#include <QFile>
#include <QFileInfo>
#include <QFileInfoList>
 
#include "fileutils.h"
 
/*!
   Delete a directory along with all of its contents.
 
   \param dirName Path of directory to remove.
   \return true on success; false on error.
*/
bool FileUtils::removeDir(const QString &dirName)
{
    bool result = true;
    QDir dir(dirName);
 
    if (dir.exists(dirName)) {
        Q_FOREACH(QFileInfo info, dir.entryInfoList(QDir::NoDotAndDotDot | QDir::System | QDir::Hidden  | QDir::AllDirs | QDir::Files, QDir::DirsFirst)) {
            if (info.isDir()) {
                result = removeDir(info.absoluteFilePath());
            }
            else {
                result = QFile::remove(info.absoluteFilePath());
            }
 
            if (!result) {
                return result;
            }
        }
        result = dir.rmdir(dirName);
    }
 
    return result;
}

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