QDir Class Reference

Constructs a QDir object that is a copy of the QDir object for directory dir.

See also operator=().

Constructs a QDir pointing to the given directory path. If path is empty the program's working directory, ("."), is used.

See also currentPath().

Constructs a QDir with path path, that filters its entries by name using nameFilter and by attributes using filters. It also sorts the names using sort.

The default nameFilter is an empty string, which excludes nothing; the default filters is AllEntries, which also means exclude nothing. The default sort is Name | IgnoreCase, i.e. sort by name case-insensitively.

If path is an empty string, QDir uses "." (the current directory). If nameFilter is an empty string, QDir uses the name filter "*" (all files).

Note that path need not exist.

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

Destroys the QDir object frees up its resources. This has no effect on the underlying directory in the file system.

Returns the absolute path name of a file in the directory. Does not check if the file actually exists in the directory; but see exists(). Redundant multiple separators or "." and ".." directories in fileName are not removed (see cleanPath()).

See also relativeFilePath(), filePath(), and canonicalPath().

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

See also setPath(), canonicalPath(), exists(), cleanPath(), dirName(), and absoluteFilePath().

Adds path to the search path for prefix.

See also setSearchPaths().

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 absolutePath() returns. If the canonical path does not exist (normally due to dangling symbolic links) canonicalPath() returns an empty string.

Example:

See also path(), absolutePath(), exists(), cleanPath(), dirName(), and absoluteFilePath().

Changes the QDir's directory to dirName.

Returns true if the new directory exists and is readable; otherwise returns false. Note that the logical cd() operation is not performed if the new directory does not exist.

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

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

Changes directory by moving one directory up from the QDir's current directory.

Returns true if the new directory exists and is readable; otherwise returns false. Note that the logical cdUp() operation is not performed if the new directory does not exist.

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

Removes all multiple directory separators "/" and resolves any "."s or ".."s found in the path, path.

Symbolic links are kept. This function does not return the canonical path, but rather the simplest version of the input. For example, "./local" becomes "local", "local/../bin" becomes "bin" and "/local/usr/../bin" becomes "/local/bin".

See also absolutePath() and canonicalPath().

Returns the total number of directories and files in the directory.

Equivalent to entryList().count().

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

Returns the application's current directory.

The directory is constructed using the absolute path of the current directory, ensuring that its path() will be the same as its absolutePath().

See also currentPath(), setCurrent(), home(), root(), and temp().

Returns the absolute path of the application's current directory.

See also current(), setCurrent(), homePath(), rootPath(), and tempPath().

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. it is the root directory) an empty string is returned.

No check is made to ensure that a directory with this name actually exists; but see exists().

See also path(), filePath(), absolutePath(), and absoluteFilePath().

Returns a list of the root directories on this system.

On Windows this returns a list of QFileInfo objects containing "C:/", "D:/", etc. On other operating systems, it returns a list containing just one root directory (i.e. "/").

See also root() and rootPath().

Returns a list of QFileInfo objects for all the files and directories in the directory, ordered according to the name and attribute filters previously set with setNameFilters() and setFilter(), and sorted according to the flags set with setSorting().

The name filter, file attribute filter, and sorting specification can be overridden using the nameFilters, filters, and sort arguments.

Returns an empty list if the directory is unreadable, does not exist, or if nothing matches the specification.

See also entryList(), setNameFilters(), setSorting(), setFilter(), isReadable(), and exists().

This is an overloaded function.

Returns a list of QFileInfo objects for all the files and directories in the directory, ordered according to the name and attribute filters previously set with setNameFilters() and setFilter(), and sorted according to the flags set with setSorting().

The attribute filter and sorting specifications can be overridden using the filters and sort arguments.

Returns an empty list if the directory is unreadable, does not exist, or if nothing matches the specification.

See also entryList(), setNameFilters(), setSorting(), setFilter(), isReadable(), and exists().

Returns a list of the names of all the files and directories in the directory, ordered according to the name and attribute filters previously set with setNameFilters() and setFilter(), and sorted according to the flags set with setSorting().

The name filter, file attribute filter, and sorting specification can be overridden using the nameFilters, filters, and sort arguments.

Returns an empty list if the directory is unreadable, does not exist, or if nothing matches the specification.

See also entryInfoList(), setNameFilters(), setSorting(), and setFilter().

This is an overloaded function.

Returns a list of the names of all the files and directories in the directory, ordered according to the name and attribute filters previously set with setNameFilters() and setFilter(), and sorted according to the flags set with setSorting().

The attribute filter and sorting specifications can be overridden using the filters and sort arguments.

Returns an empty list if the directory is unreadable, does not exist, or if nothing matches the specification.

Note: To list symlinks that point to non existing files, System must be passed to the filter.

See also entryInfoList(), setNameFilters(), setSorting(), and setFilter().

Returns true if the file called name exists; otherwise returns false.

Unless name contains an absolute file path, the file name is assumed to be relative to the directory itself, so this function is typically used to check for the presence of files within a directory.

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

This is an overloaded function.

Returns true if the directory exists; otherwise returns false. (If a file with the same name is found this function will return false).

The overload of this function that accepts an argument is used to test for the presence of files and directories within a directory.

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

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

See also dirName(), absoluteFilePath(), isRelative(), and canonicalPath().

Returns the value set by setFilter()

See also setFilter().

Returns pathName using '/' as file separator. On Windows, for instance, fromNativeSeparators("c:\\winnt\\system32") returns "c:/winnt/system32".

The returned string may be the same as the argument on some operating systems, for example on Unix.

See also toNativeSeparators() and separator().

Returns the user's home directory.

The directory is constructed using the absolute path of the home directory, ensuring that its path() will be the same as its absolutePath().

See homePath() for details.

See also drives(), current(), root(), and temp().

Returns the absolute path of the user's home directory.

Under Windows this function will return the directory of the current user's profile. Typically, this is:

Use the toNativeSeparators() function to convert the separators to the ones that are appropriate for the underlying operating system.

If the directory of the current user's profile does not exist or cannot be retrieved, the following alternatives will be checked (in the given order) until an existing and available path is found:

1. The path specified by the USERPROFILE environment variable.
2. The path formed by concatenating the HOMEDRIVE and HOMEPATH environment variables.
3. The path specified by the HOME environment variable.
4. The path returned by the rootPath() function (which uses the SystemDrive environment variable)
5. The C:/ directory.

Under non-Windows operating systems the HOME environment variable is used if it exists, otherwise the path returned by the rootPath(). On Symbian always the same as the path returned by the rootPath().

See also home(), currentPath(), rootPath(), and tempPath().

Returns true if the directory's path is absolute; otherwise returns false. See isAbsolutePath().

See also isRelative(), makeAbsolute(), and cleanPath().

Returns true if path is absolute; returns false if it is relative.

See also isAbsolute(), isRelativePath(), makeAbsolute(), and cleanPath().

Returns true if the directory is readable and we can open files by name; otherwise returns false.

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

See also QFileInfo::isReadable().

Returns true if the directory path is relative; otherwise returns false. (Under Unix a path is relative if it does not start with a "/").

See also makeAbsolute(), isAbsolute(), isAbsolutePath(), and cleanPath().

Returns true if path is relative; returns false if it is absolute.

See also isRelative(), isAbsolutePath(), and makeAbsolute().

Returns true if the directory is the root directory; otherwise returns false.

Note: If the directory is a symbolic link to the root directory this function returns false. If you want to test for this use canonicalPath(), e.g.

See also root() and rootPath().

Converts the directory path to an absolute path. If it is already absolute nothing happens. Returns true if the conversion succeeded; otherwise returns false.

See also isAbsolute(), isAbsolutePath(), isRelative(), and cleanPath().

Returns true if the fileName matches the wildcard (glob) pattern filter; otherwise returns false. The filter may contain multiple patterns separated by spaces or semicolons. The matching is case insensitive.

See also QRegExp wildcard matching, QRegExp::exactMatch(), entryList(), and entryInfoList().

This is an overloaded function.

Returns true if the fileName matches any of the wildcard (glob) patterns in the list of filters; otherwise returns false. The matching is case insensitive.

See also QRegExp wildcard matching, QRegExp::exactMatch(), entryList(), and entryInfoList().

Creates a sub-directory called dirName.

Returns true on success; otherwise returns false.

See also rmdir().

Creates the directory path dirPath.

The function will create all parent directories necessary to create the directory.

Returns true if successful; otherwise returns false.

See also rmpath().

Returns the string list set by setNameFilters()

See also setNameFilters().

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(), absolutePath(), exists(), cleanPath(), dirName(), absoluteFilePath(), toNativeSeparators(), and makeAbsolute().

Refreshes the directory information.

Returns the path to fileName relative to the directory.

See also absoluteFilePath(), filePath(), and canonicalPath().

Removes the file, fileName.

Returns true if the file is removed successfully; otherwise returns false.

Renames a file or directory from oldName to newName, and returns true if successful; otherwise returns false.

On most file systems, rename() fails only if oldName does not exist, if newName and oldName are not on the same partition or if a file with the new name 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.

Removes the directory specified by dirName.

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

Returns true if successful; otherwise returns false.

See also mkdir().

Removes the directory path dirPath.

The function will remove all parent directories in dirPath, provided that they are empty. This is the opposite of mkpath(dirPath).

Returns true if successful; otherwise returns false.

See also mkpath().

Returns the root directory.

The directory is constructed using the absolute path of the root directory, ensuring that its path() will be the same as its absolutePath().

See rootPath() for details.

See also drives(), current(), home(), and temp().

Returns the absolute path of the root directory.

For Unix operating systems this returns "/". For Windows file systems this normally returns "c:/". On Symbian this typically returns "c:/data", i.e. the same as native PathInfo::PhoneMemoryRootPath().

See also root(), drives(), currentPath(), homePath(), and tempPath().

Returns the search paths for prefix.

See also setSearchPaths() and addSearchPath().

Returns the native directory separator: "/" under Unix (including Mac OS X) and "\" under Windows.

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. If you want to display paths to the user using their operating system's separator use toNativeSeparators().

Sets the application's current working directory to path. Returns true if the directory was successfully changed; otherwise returns false.

See also current(), currentPath(), home(), root(), and temp().

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

See also filter() and setNameFilters().

Sets the name filters used by entryList() and entryInfoList() to the list of filters specified by nameFilters.

Each name filter is a wildcard (globbing) filter that understands * and ? wildcards. (See QRegExp wildcard matching.)

For example, the following code sets three name filters on a QDir to ensure that only files with extensions typically used for C++ source files are listed:

See also nameFilters() and setFilter().

Sets the path of the directory to path. The path is cleaned of redundant ".", ".." and of multiple separators. No check is made to see whether a directory with this path actually exists; but you can check for yourself using exists().

The path can be either absolute or relative. Absolute paths begin with the directory separator "/" (optionally preceded by a drive specification under Windows). 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".

See also path(), absolutePath(), exists(), cleanPath(), dirName(), absoluteFilePath(), isRelative(), and makeAbsolute().

Sets or replaces Qt's search paths for file names with the prefix prefix to searchPaths.

To specify a prefix for a file name, prepend the prefix followed by a single colon (e.g., "images:undo.png", "xmldocs:books.xml"). prefix can only contain letters or numbers (e.g., it cannot contain a colon, nor a slash).

Qt uses this search path to locate files with a known prefix. The search path entries are tested in order, starting with the first entry.

File name prefix must be at least 2 characters long to avoid conflicts with Windows drive letters.

Search paths may contain paths to The Qt Resource System.

See also searchPaths().

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

The sort is specified by OR-ing values from the enum QDir::SortFlag.

See also sorting() and SortFlag.

Returns the value set by setSorting()

See also setSorting() and SortFlag.

Returns the system's temporary directory.

The directory is constructed using the absolute path of the temporary directory, ensuring that its path() will be the same as its absolutePath().

See tempPath() for details.

See also drives(), current(), home(), and root().

Returns the absolute path of the system's temporary directory.

On Unix/Linux systems this is usually /tmp; on Windows this is usually the path in the TEMP or TMP environment variable. Whether a directory separator is added to the end or not, depends on the operating system.

See also temp(), currentPath(), homePath(), and rootPath().

Returns pathName with the '/' separators converted to separators that are appropriate for the underlying operating system.

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

The returned string may be the same as the argument on some operating systems, for example on Unix.

See also fromNativeSeparators() and separator().

Returns true if directory dir and this directory have different paths or different sort or filter settings; otherwise returns false.

Example:

Makes a copy of the dir object and assigns it to this QDir object.

Returns true if directory dir and this directory have the same path and their sort and filter settings are the same; otherwise returns false.

Example:

Returns the file name at position pos in the list of file names. Equivalent to entryList().at(index). pos must be a valid index position in the list (i.e., 0 <= pos < count()).

See also count() and entryList().

Use QDir::addSearchPath() with a prefix instead.

Adds path to the search paths searched in to find resources that are not specified with an absolute path. The default search path is to search only in the root (:/).

See also The Qt Resource System.

This is an overloaded function.

Sets the directory path to the given path.

Use setPath() instead.

Use absoluteFilePath(fileName) instead.

The acceptAbsPath parameter is ignored.

Use absolutePath() instead.

Use cleanPath() instead.

Use QDir::toNativeSeparators() instead.

Use makeAbsolute() instead.

Returns the absolute path of the application's current directory.

Use currentPath() instead.

See also currentPath() and setCurrent().

This is an overloaded function.

Use the overload that takes a name filter string list as first argument instead of a combination of attribute filter flags.

This is an overloaded function.

Use the overload that takes a name filter string list as first argument instead of a combination of attribute filter flags.

Returns the absolute path of the user's home directory.

Use homePath() instead.

See also homePath().

Use filter() & AllDirs instead.

See also setMatchAllDirs().

Use mkdir(dirName) instead.

The acceptAbsPath parameter is ignored.

Use nameFilters() instead.

See also setNameFilter().

Use rmdir(dirName) instead.

The acceptAbsPath parameter is ignored.

Returns the absolute path of the root directory.

Use rootPath() instead.

See also rootPath().

Use setFilter() instead.

See also matchAllDirs().

Use setNameFilters() instead.

The nameFilter is a wildcard (globbing) filter that understands "*" and "?" wildcards. (See QRegExp wildcard matching.) You may specify several filter entries, each separated by spaces or by semicolons.

For example, if you want entryList() and entryInfoList() to list all files ending with either ".cpp" or ".h", you would use either dir.setNameFilters("*.cpp *.h") or dir.setNameFilters("*.cpp;*.h").

For example, if you have code like

you can rewrite it as

See also nameFilter().