QDir Class Reference

Traverses directory structures and contents in a platform-independent way. More...

#include <qdir.h>

List of all member functions.

Public Members

• enum FilterSpec { Dirs = 0x001, Files = 0x002, Drives = 0x004, NoSymLinks = 0x008, All = 0x007, TypeMask = 0x00F, Readable = 0x010, Writable = 0x020, Executable = 0x040, RWEMask = 0x070, Modified = 0x080, Hidden = 0x100, System = 0x200, AccessMask = 0x3F0, DefaultFilter = -1 }
• enum SortSpec { Name = 0x00, Time = 0x01, Size = 0x02, Unsorted = 0x03, SortByMask = 0x03, DirsFirst = 0x04, Reversed = 0x08, IgnoreCase = 0x10, DefaultSort = -1 }
• QDir () 
• QDir ( const QString & path, const QString & nameFilter = QString::null, int sortSpec = Name | IgnoreCase, int filterSpec = All ) 
• QDir ( const QDir & ) 
• virtual ~QDir () 
• QDir& operator= ( const QDir & ) 
• QDir& operator= ( const QString & path ) 
• virtual void setPath ( const QString & path ) 
• virtual QString path () const
• virtual QString absPath () const
• virtual QString canonicalPath () const
• virtual QString dirName () const
• virtual QString filePath ( const QString & fileName, bool acceptAbsPath = TRUE ) const
• virtual QString absFilePath ( const QString & fileName, bool acceptAbsPath = TRUE ) const
• virtual bool cd ( const QString & dirName, bool acceptAbsPath = TRUE ) 
• virtual bool cdUp () 
• QString nameFilter () const
• virtual void setNameFilter ( const QString & nameFilter ) 
• FilterSpec filter () const
• virtual void setFilter ( int filterSpec ) 
• SortSpec sorting () const
• virtual void setSorting ( int sortSpec ) 
• bool matchAllDirs () const
• virtual void setMatchAllDirs ( bool ) 
• uint count () const
• QString operator[] ( int ) const
• virtual QStrList encodedEntryList ( int filterSpec = DefaultFilter, int sortSpec = DefaultSort ) const
• virtual QStrList encodedEntryList ( const QString & nameFilter, int filterSpec = DefaultFilter, int sortSpec = DefaultSort ) const
• virtual QStringList entryList ( int filterSpec = DefaultFilter, int sortSpec = DefaultSort ) const
• virtual QStringList entryList ( const QString & nameFilter, int filterSpec = DefaultFilter, int sortSpec = DefaultSort ) const
• virtual const QFileInfoList* entryInfoList ( int filterSpec = DefaultFilter, int sortSpec = DefaultSort ) const
• virtual const QFileInfoList* entryInfoList ( const QString & nameFilter, int filterSpec = DefaultFilter, int sortSpec = DefaultSort ) const
• virtual bool mkdir ( const QString & dirName, bool acceptAbsPath = TRUE ) const
• virtual bool rmdir ( const QString & dirName, bool acceptAbsPath = TRUE ) const
• virtual bool isReadable () const
• virtual bool exists () const
• virtual bool isRoot () const
• virtual bool isRelative () const
• virtual void convertToAbs () 
• virtual bool operator== ( const QDir & ) const
• virtual bool operator!= ( const QDir & ) const
• virtual bool remove ( const QString & fileName, bool acceptAbsPath = TRUE ) 
• virtual bool rename ( const QString & name, const QString & newName, bool acceptAbsPaths = TRUE ) 
• virtual bool exists ( const QString & name, bool acceptAbsPath = TRUE ) 

Static Public Members

• QString convertSeparators ( const QString & pathName ) 
• const QFileInfoList* drives () 
• char separator () 
• bool setCurrent ( const QString & path ) 
• QDir current () 
• QDir home () 
• QDir root () 
• QString currentDirPath () 
• QString homeDirPath () 
• QString rootDirPath () 
• bool match ( const QStringList & filters, const QString & fileName ) 
• bool match ( const QString & filter, const QString & fileName ) 
• QString cleanDirPath ( const QString & dirPath ) 
• bool isRelativePath ( const QString & path ) 

---

Detailed Description

Traverses directory structures and contents in a platform-independent way.

A QDir can point to a file using either a relative or an absolute file path. Absolute file paths begin with the directory separator ('/') or a drive specification (not applicable to UNIX). Relative file names begin with a directory name or a file name and specify a path relative to the current directory.

An example of an absolute path is the string "/tmp/quartz", a relative path might look like "src/fatlib". You can use the function isRelative() to check if a QDir is using a relative or an absolute file path. You can call the function convertToAbs() to convert a relative QDir to an absolute one.

The directory "example" under the current directory is checked for existence in the example below:

    QDir d( "example" );                        // "./example"
    if ( !d.exists() )
        qWarning( "Cannot find the example directory" );

If you always use '/' as a directory separator, Qt will translate your paths to conform to the underlying operating system.

cd() and cdUp() can be used to navigate the directory tree. Note that the logical cd and cdUp operations are not performed if the new directory does not exist.

Example:

    QDir d = QDir::root();                      // "/"
    if ( !d.cd("tmp") ) {                       // "/tmp"
        qWarning( "Cannot find the \"/tmp\" directory" );
    } else {
        QFile f( d.filePath("ex1.txt") );       // "/tmp/ex1.txt"
        if ( !f.open(IO_ReadWrite) )
            qWarning( "Cannot create the file %s", f.name() );
    }

To read the contents of a directory you can use the entryList() and entryInfoList() functions.

Example:

    #include <stdio.h>
    #include <qdir.h>

    //
    // This program scans the current directory and lists all files
    // that are not symbolic links, sorted by size with the smallest files
    // first.
    //

    int main( int argc, char **argv )
    {
        QDir d;
        d.setFilter( QDir::Files | QDir::Hidden | QDir::NoSymLinks );
        d.setSorting( QDir::Size | QDir::Reversed );

        const QFileInfoList *list = d.entryInfoList();
        QFileInfoListIterator it( *list );      // create list iterator
        QFileInfo *fi;                          // pointer for traversing

        printf( "     BYTES FILENAME\n" );      // print header
        while ( (fi=it.current()) ) {           // for each file...
            printf( "%10li %s\n", fi->size(), fi->fileName().data() );
            ++it;                               // goto next list element
        }
    }

---

Member Type Documentation

QDir::FilterSpec

This enum describes how QDir is to select what entries in a directory to return. The filter value is specified by or-ing together values from the following list:

• Dirs - List directories only
• Files - List files only
• Drives - List disk drives (does nothing under unix)
• NoSymLinks - Do not list symbolic links (where they exist)
• Readable - List files for which the application has read access.
• Writable - List files for which the application has write access.
• Executable - List files for which the application has execute access
• Modified - Only list files that have been modified (does nothing under unix)
• Hidden - List hidden files (on unix, files starting with a .)
• System - List system files (on unix, FIFOs, sockets and device files)

If you do not set any of Readable, Writable or Executable, QDir will set all three of them. This makes the default easy to write and at the same time useful.

Examples: Readable|Writable means list all files for which the application has read access, write access or both. Dirs|Drives means list drives, directories, all files that the application can read, write or execute, and also symlinks to such files/directories.

QDir::SortSpec

This enum describes how QDir is to sort entries in a directory when it returns a list of them. The sort value is specified by or-ing together values from the following list:

• Name - sort by name
• Time - sort by time (modification time)
• Size - sort by file size
• Unsorted - do not sort
• DirsFirst - put all directories first in the list
• Reversed - reverse the sort order
• IgnoreCase - sort case-insensitively

You can only specify one of the first four. If you specify both DirsFirst and Reversed, directories are still put first but the list is otherwise reversed.

---

Member Function Documentation

QDir::QDir ()

Constructs a QDir pointing to the current directory.

See also currentDirPath().

QDir::QDir ( const QString & path, const QString & nameFilter = QString::null, int sortSpec = Name | IgnoreCase, int filterSpec = All )

Constructs a QDir.

Arguments:

• path is the directory.
• nameFilter is the file name filter.
• sortSpec is the sort specification, which describes how to sort the files in the directory.
• filterSpec is the filter specification, which describes how to filter the files in the directory.

Most of these arguments (except path) have optional values.

Example:

    // lists all files in /tmp

    QDir d( "/tmp" );
    for ( int i=0; i<d.count(); i++ )
        printf( "%s\n", d[i] );

If path is "" or null, the directory is set to "." (the current directory). If nameFilter is "" or null, it is set to "*" (all files).

No check is made to ensure that the directory exists.

See also exists(), setPath(), setNameFilter(), setFilter() and setSorting().

QDir::QDir ( const QDir & d )

Constructs a QDir that is a copy of the given directory.

See also operator=().

QDir::~QDir () [virtual]

Destructs the QDir and cleans up.

QString QDir::absFilePath ( const QString & fileName, bool acceptAbsPath = TRUE ) const [virtual]

Returns the absolute path name of a file in the directory. Does NOT check if the file actually exists in the directory. Redundant multiple separators or "." and ".." directories in fileName will NOT be removed (see cleanDirPath()).

If acceptAbsPath is TRUE a fileName starting with a separator ('/') will be returned without change. if acceptAbsPath is FALSE an absolute path will be appended to the directory path.

See also filePath().

QString QDir::absPath () const [virtual]

Returns the absolute (a path that starts with '/') path, which may contain symbolic links, but never contains redundant ".", ".." or multiple separators.

See also setPath(), canonicalPath(), exists(), cleanDirPath(), dirName() and absFilePath().

QString QDir::canonicalPath () const [virtual]

Returns the canonical path, i.e. a path without symbolic links or redundant "." or ".." elements.

On systems that do not have symbolic links this function will always return the same string that absPath returns. If the canonical path does not exist (normally due to dangling symbolic links) canonicalPath() returns a null string.

See also path(), absPath(), exists(), cleanDirPath(), dirName(), absFilePath() and QString::isNull().

bool QDir::cd ( const QString & dirName, bool acceptAbsPath = TRUE ) [virtual]

Changes directory by descending into the given directory. Returns TRUE if the new directory exists and is readable. Note that the logical cd operation is NOT performed if the new directory does not exist.

If acceptAbsPath is TRUE a path starting with a separator ('/') will cd to the absolute directory, if acceptAbsPath is FALSE any number of separators at the beginning of dirName will be removed.

Example:

  QDir d = QDir::home();  // now points to home directory
  if ( !d.cd("c++") ) {   // now points to "c++" under home directory if OK
      QFileInfo fi( d, "c++" );
      if ( fi.exists() ) {
          if ( fi.isDir() )
              qWarning( "Cannot cd into \"%s\".", (char*)d.absFilePath("c++") );
          else
              qWarning( "Cannot create directory \"%s\"\n"
                       "A file named \"c++\" already exists in \"%s\"",
                       (const char *)d.absFilePath("c++"),
                       (const char *)d.path() );
          return;
      } else {
          qWarning( "Creating directory \"%s\"",
                   (const char *) d.absFilePath("c++") );
          if ( !d.mkdir( "c++" ) ) {
              qWarning("Could not create directory \"%s\"",
                      (const char *)d.absFilePath("c++") );
              return;
          }
      }
  }

Calling cd( ".." ) is equivalent to calling cdUp().

See also cdUp(), isReadable(), exists() and path().

bool QDir::cdUp () [virtual]

Changes directory by moving one directory up the path followed to arrive at the current directory.

Returns TRUE if the new directory exists and is readable. Note that the logical cdUp() operation is not performed if the new directory does not exist.

See also cd(), isReadable(), exists() and path().

QString QDir::cleanDirPath ( const QString & filePath ) [static]

Removes all multiple directory separators ('/') and resolves any "." or ".." found in the path.

Symbolic links are kept. This function does not return the canonical path, but rather the most simplified version of the input. "../stuff" becomes "stuff", "stuff/../nonsense" becomes "nonsense" and "\\stuff\\more\\..\\nonsense" becomes "\\stuff\\nonsense".

See also absPath() and canonicalPath().

QString QDir::convertSeparators ( const QString & pathName ) [static]

Converts the '/' separators in pathName to system native separators. Returns the translated string.

On Windows, convertSeparators("c:/winnt/system32") returns "c:\winnt\system32".

No conversion is done on UNIX.

void QDir::convertToAbs () [virtual]

Converts the directory path to an absolute path. If it is already absolute nothing is done.

See also isRelative().

uint QDir::count () const

Returns the number of files that was found. Equivalent to entryList().count().

See also operator[]() and entryList().

QDir QDir::current () [static]

Returns the current directory.

See also currentDirPath() and QDir::QDir().

QString QDir::currentDirPath () [static]

Returns the absolute path of the current directory.

See also current().

QString QDir::dirName () const [virtual]

Returns the name of the directory, this is NOT the same as the path, e.g. a directory with the name "mail", might have the path "/var/spool/mail". If the directory has no name (e.g. the root directory) a null string is returned.

No check is made to ensure that a directory with this name actually exists.

See also path(), absPath(), absFilePath(), exists() and QString::isNull().

const QFileInfoList * QDir::drives () [static]

Returns a list of the root directories on this system. On win32, this returns a number of QFileInfo objects containing "C:/", "D:/" etc. On other operating systems, it returns a list containing just one root directory (e.g. "/").

The returned pointer is owned by Qt. Callers should not delete or modify it.

QStrList QDir::encodedEntryList ( const QString & nameFilter, int filterSpec = DefaultFilter, int sortSpec = DefaultSort ) const [virtual]

This function is included to easy porting from Qt 1.x to Qt 2.0, it is the same as entryList(), but encodes the filenames as 8-bit strings using QFile::encodedName().

It is more efficient to use entryList().

QStrList QDir::encodedEntryList ( int filterSpec = DefaultFilter, int sortSpec = DefaultSort ) const [virtual]

This function is included to easy porting from Qt 1.x to Qt 2.0, it is the same as entryList(), but encodes the filenames as 8-bit strings using QFile::encodedName().

It is more efficient to use entryList().

const QFileInfoList * QDir::entryInfoList ( const QString & nameFilter, int filterSpec = DefaultFilter, int sortSpec = DefaultSort ) const [virtual]

Returns a list of QFileInfo objects for all files and directories in the directory pointed to using the setSorting(), setFilter() and setNameFilter() specifications.

The the filter and sorting specifications can be overridden using the nameFilter, filterSpec and sortSpec arguments.

Returns 0 if the directory is unreadable or does not exist.

The returned pointer is a const pointer to a QFileInfoList. The list is owned by the QDir object and will be reused on the next call to entryInfoList() for the same QDir instance. If you want to keep the entries of the list after a subsequent call to this function you will need to copy them.

See also entryList(), setNameFilter(), setSorting() and setFilter().

const QFileInfoList * QDir::entryInfoList ( int filterSpec = DefaultFilter, int sortSpec = DefaultSort ) const [virtual]

Returns a list of QFileInfo objects for all files and directories in the directory pointed to using the setSorting(), setFilter() and setNameFilter() specifications.

The the filter and sorting specifications can be overridden using the filterSpec and sortSpec arguments.

Returns 0 if the directory is unreadable or does not exist.

The returned pointer is a const pointer to a QFileInfoList. The list is owned by the QDir object and will be reused on the next call to entryInfoList() for the same QDir instance. If you want to keep the entries of the list after a subsequent call to this function you will need to copy them.

See also entryList(), setNameFilter(), setSorting() and setFilter().

QStringList QDir::entryList ( const QString & nameFilter, int filterSpec = DefaultFilter, int sortSpec = DefaultSort ) const [virtual]

Returns a list of the names of all files and directories in the directory indicated by the setSorting(), setFilter() and setNameFilter() specifications.

The the filter and sorting specifications can be overridden using the nameFilter, filterSpec and sortSpec arguments.

Returns and empty list if the directory is unreadable or does not exist.

See also entryInfoList(), setNameFilter(), setSorting(), setFilter() and encodedEntryList().

QStringList QDir::entryList ( int filterSpec = DefaultFilter, int sortSpec = DefaultSort ) const [virtual]

Returns a list of the names of all files and directories in the directory indicated by the setSorting(), setFilter() and setNameFilter() specifications.

The the filter and sorting specifications can be overridden using the filterSpec and sortSpec arguments.

Returns an empty list if the directory is unreadable or does not exist.

See also entryInfoList(), setNameFilter(), setSorting(), setFilter() and encodedEntryList().

bool QDir::exists () const [virtual]

Returns TRUE if the directory exists. (If a file with the same name is found this function will of course return FALSE).

See also QFileInfo::exists() and QFile::exists().

bool QDir::exists ( const QString & name, bool acceptAbsPath = TRUE ) [virtual]

Checks for existence of a file.

If acceptAbsPaths is TRUE a path starting with a separator ('/') will check the file with the absolute path, if acceptAbsPath is FALSE any number of separators at the beginning of name will be removed.

Returns TRUE if the file exists, otherwise FALSE.

See also QFileInfo::exists() and QFile::exists().

QString QDir::filePath ( const QString & fileName, bool acceptAbsPath = TRUE ) const [virtual]

Returns the path name of a file in the directory. Does NOT check if the file actually exists in the directory. If the QDir is relative the returned path name will also be relative. Redundant multiple separators or "." and ".." directories in fileName will not be removed (see cleanDirPath()).

If acceptAbsPath is TRUE a fileName starting with a separator ('/') will be returned without change. If acceptAbsPath is FALSE an absolute path will be appended to the directory path.

See also absFilePath(), isRelative() and canonicalPath().

QDir::FilterSpec QDir::filter() const

Returns the value set by setFilter().

QDir QDir::home () [static]

Returns the home directory.

See also homeDirPath().

QString QDir::homeDirPath () [static]

Returns the absolute path for the user's home directory,

See also home().

bool QDir::isReadable () const [virtual]

Returns TRUE if the directory is readable AND we can open files by name. This function will return FALSE if only one of these is present.

Warning: A FALSE value from this function is not a guarantee that files in the directory are not accessible.

See also QFileInfo::isReadable().

bool QDir::isRelative () const [virtual]

Returns TRUE if the directory path is relative to the current directory, FALSE if the path is absolute (e.g. under UNIX a path is relative if it does not start with a '/').

According to Einstein this function should always return TRUE.

See also convertToAbs().

bool QDir::isRelativePath ( const QString & path ) [static]

Returns TRUE if the path is relative, FALSE if it is absolute.

See also isRelative().

bool QDir::isRoot () const [virtual]

Returns TRUE if the directory is the root directory, otherwise FALSE.

Note: If the directory is a symbolic link to the root directory this function returns FALSE. If you want to test for this you can use canonicalPath():

Example:

    QDir d( "/tmp/root_link" );
    d = d.canonicalPath();
    if ( d.isRoot() )
        qWarning( "It IS a root link!" );

See also root() and rootDirPath().

bool QDir::match ( const QString & filter, const QString & fileName ) [static]

Returns TRUE if the fileName matches the wildcard filter. Filter may also contain multiple wildcards separated by spaces or semicolons.

See also QRegExp.

bool QDir::match ( const QStringList & filters, const QString & fileName ) [static]

Returns TRUE if the fileName matches one of the wildcards in the list filters.

See also QRegExp.

bool QDir::matchAllDirs () const

Returns the value set by setMatchAllDirs()

See also setMatchAllDirs().

bool QDir::mkdir ( const QString & dirName, bool acceptAbsPath = TRUE ) const [virtual]

Creates a directory.

If acceptAbsPath is TRUE a path starting with a separator ('/') will create the absolute directory, if acceptAbsPath is FALSE any number of separators at the beginning of dirName will be removed.

Returns TRUE if successful, otherwise FALSE.

See also rmdir().

QString QDir::nameFilter () const

Returns the string set by setNameFilter().

bool QDir::operator!= ( const QDir & d ) const [virtual]

Returns TRUE if the d and this dir have different path or different sort/filter settings, otherwise FALSE.

QDir & QDir::operator= ( const QString & path )

Sets the directory path to be the given path.

QDir & QDir::operator= ( const QDir & d )

Makes a copy of d and assigns it to this QDir.

bool QDir::operator== ( const QDir & d ) const [virtual]

Returns TRUE if the d and this dir have the same path and all sort and filter settings are equal, otherwise FALSE.

QString QDir::operator[] ( int index ) const

Returns the file name at position index in the list of found file names. Equivalent to entryList().at(index).

Returns null if the index is out of range or if the entryList() function failed.

See also count() and entryList().

QString QDir::path () const [virtual]

Returns the path, this may contain symbolic links, but never contains redundant ".", ".." or multiple separators.

The returned path can be either absolute or relative (see setPath()).

See also setPath(), absPath(), exists(), cleanDirPath(), dirName(), absFilePath() and convertSeparators().

bool QDir::remove ( const QString & fileName, bool acceptAbsPath = TRUE ) [virtual]

Removes a file.

If acceptAbsPath is TRUE a path starting with a separator ('/') will remove the file with the absolute path, if acceptAbsPath is FALSE any number of separators at the beginning of fileName will be removed.

Returns TRUE if successful, otherwise FALSE.

bool QDir::rename ( const QString & name, const QString & newName, bool acceptAbsPaths = TRUE ) [virtual]

Renames a file.

If acceptAbsPaths is TRUE a path starting with a separator ('/') will rename the file with the absolute path, if acceptAbsPath is FALSE any number of separators at the beginning of name will be removed.

Returns TRUE if successful, otherwise FALSE.

On most file systems, rename() fails only if oldName does not exist or if newName and oldName are not on the same partition. On Windows, rename() will fail if newName already exists. However, there are also other reasons why rename() can fail. For example, on at least one file system rename() fails if newName points to an open file.

bool QDir::rmdir ( const QString & dirName, bool acceptAbsPath = TRUE ) const [virtual]

Removes a directory.

If acceptAbsPath is TRUE a path starting with a separator ('/') will remove the absolute directory, if acceptAbsPath is FALSE any number of separators at the beginning of dirName will be removed.

The directory must be empty for rmdir() to succeed.

Returns TRUE if successful, otherwise FALSE.

See also mkdir().

QDir QDir::root () [static]

Returns the root directory.

See also rootDirPath() and drives().

QString QDir::rootDirPath () [static]

Returns the absolute path for the root directory ("/" under UNIX).

See also root() and drives().

char QDir::separator () [static]

Returns the native directory separator; '/' under UNIX and '\' under MS-DOS, Windows NT and OS/2.

You do not need to use this function to build file paths. If you always use '/', Qt will translate your paths to conform to the underlying operating system.

bool QDir::setCurrent ( const QString & path ) [static]

Sets the the current directory. Returns TRUE if successful.

void QDir::setFilter ( int filterSpec ) [virtual]

Sets the filter used by entryList() and entryInfoList(). The filter is used to specify the kind of files that should be returned by entryList() and entryInfoList().

See also filter() and setNameFilter().

void QDir::setMatchAllDirs ( bool enable ) [virtual]

If enable is TRUE, all directories will be listed (even if they do not match the filter or the name filter), otherwise only matched directories will be listed.

See also matchAllDirs().

Bugs and limitations:

• Currently, directories that do not match the filter will not be included (the name filter will be ignored as expected).

void QDir::setNameFilter ( const QString & nameFilter ) [virtual]

Sets the name filter used by entryList() and entryInfoList().

The name filter is a wildcarding filter that understands "*" and "?" wildcards, You may specify several filter entries separated by a " " or a ";". If you want entryList() and entryInfoList() to list all files ending with ".cpp" and all files ending with ".h", you simply call dir.setNameFilter("*.cpp *.h") or dir.setNameFilter("*.cpp;*.h")

See also nameFilter() and setFilter().

void QDir::setPath ( const QString & path ) [virtual]

Sets the path of the directory. The path is cleaned of redundant ".", ".." and multiple separators. No check is made to ensure that a directory with this path exists.

The path can be either absolute or relative. Absolute paths begin with the directory separator ('/') or a drive specification (not applicable to UNIX). Relative file names begin with a directory name or a file name and specify a path relative to the current directory. An example of an absolute path is the string "/tmp/quartz", a relative path might look like "src/fatlib". You can use the function isRelative() to check if a QDir is using a relative or an absolute file path. You can call the function convertToAbs() to convert a relative QDir to an absolute one.

See also path(), absPath(), exists(), cleanDirPath(), dirName(), absFilePath(), isRelative() and convertToAbs().

void QDir::setSorting ( int sortSpec ) [virtual]

Sets the sorting order used by entryList() and entryInfoList().

The sortSpec is specified by or-ing values from the enum SortSpec. The different values are:

One of these:

Name

Sort by name (alphabetical order).

Time

Sort by time (most recent first).

Size

Sort by size (largest first).

Unsorted

Use the operating system order (UNIX does NOT sort alphabetically).

ORed with zero or more of these:

DirsFirst

Always put directory names first.

Reversed

Reverse sort order.

IgnoreCase

Ignore case when sorting by name.

QDir::SortSpec QDir::sorting() const

Returns the value set by setSorting()

See also setSorting().

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