QtBase
v6.3.1
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The QDirIterator class provides an iterator for directory entrylists. More...
#include <qdiriterator.h>
Public Types | |
enum | IteratorFlag { NoIteratorFlags = 0x0 , FollowSymlinks = 0x1 , Subdirectories = 0x2 } |
Public Member Functions | |
QDirIterator (const QDir &dir, IteratorFlags flags=NoIteratorFlags) | |
QDirIterator (const QString &path, IteratorFlags flags=NoIteratorFlags) | |
QDirIterator (const QString &path, QDir::Filters filter, IteratorFlags flags=NoIteratorFlags) | |
QDirIterator (const QString &path, const QStringList &nameFilters, QDir::Filters filters=QDir::NoFilter, IteratorFlags flags=NoIteratorFlags) | |
~QDirIterator () | |
QString | next () |
QFileInfo | nextFileInfo () |
bool | hasNext () const |
QString | fileName () const |
QString | filePath () const |
QFileInfo | fileInfo () const |
QString | path () const |
Friends | |
class | QDir |
The QDirIterator class provides an iterator for directory entrylists.
\inmodule QtCore
You can use QDirIterator to navigate entries of a directory one at a time. It is similar to QDir::entryList() and QDir::entryInfoList(), but because it lists entries one at a time instead of all at once, it scales better and is more suitable for large directories. It also supports listing directory contents recursively, and following symbolic links. Unlike QDir::entryList(), QDirIterator does not support sorting.
The QDirIterator constructor takes a QDir or a directory as argument. After construction, the iterator is located before the first directory entry. Here's how to iterate over all the entries sequentially:
Here's how to find and read all files filtered by name, recursively:
The next() and nextFileInfo() functions advance the iterator and return the path or the QFileInfo of the next directory entry. You can also call filePath() or fileInfo() to get the current file path or QFileInfo without first advancing the iterator. The fileName() function returns only the name of the file, similar to how QDir::entryList() works.
Unlike Qt's container iterators, QDirIterator is uni-directional (i.e., you cannot iterate directories in reverse order) and does not allow random access.
Definition at line 48 of file qdiriterator.h.
This enum describes flags that you can combine to configure the behavior of QDirIterator.
\value NoIteratorFlags The default value, representing no flags. The iterator will return entries for the assigned path.
\value Subdirectories List entries inside all subdirectories as well.
\value FollowSymlinks When combined with Subdirectories, this flag enables iterating through all subdirectories of the assigned path, following all symbolic links. Symbolic link loops (e.g., "link" => "." or "link" => "..") are automatically detected and ignored.
Enumerator | |
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NoIteratorFlags | |
FollowSymlinks | |
Subdirectories |
Definition at line 51 of file qdiriterator.h.
QDirIterator::QDirIterator | ( | const QDir & | dir, |
IteratorFlags | flags = NoIteratorFlags |
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Constructs a QDirIterator that can iterate over dir's entrylist, using dir's name filters and regular filters. You can pass options via flags to decide how the directory should be iterated.
By default, flags is NoIteratorFlags, which provides the same behavior as in QDir::entryList().
The sorting in dir is ignored.
Definition at line 416 of file qdiriterator.cpp.
QDirIterator::QDirIterator | ( | const QString & | path, |
IteratorFlags | flags = NoIteratorFlags |
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Constructs a QDirIterator that can iterate over path. You can pass options via flags to decide how the directory should be iterated.
By default, flags is NoIteratorFlags, which provides the same behavior as in QDir::entryList().
Definition at line 452 of file qdiriterator.cpp.
QDirIterator::QDirIterator | ( | const QString & | path, |
QDir::Filters | filters, | ||
IteratorFlags | flags = NoIteratorFlags |
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Constructs a QDirIterator that can iterate over path, with no name filtering and filters for entry filtering. You can pass options via flags to decide how the directory should be iterated.
By default, filters is QDir::NoFilter, and flags is NoIteratorFlags, which provides the same behavior as in QDir::entryList().
Definition at line 435 of file qdiriterator.cpp.
QDirIterator::QDirIterator | ( | const QString & | path, |
const QStringList & | nameFilters, | ||
QDir::Filters | filters = QDir::NoFilter , |
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IteratorFlags | flags = NoIteratorFlags |
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Constructs a QDirIterator that can iterate over path, using nameFilters and filters. You can pass options via flags to decide how the directory should be iterated.
By default, flags is NoIteratorFlags, which provides the same behavior as QDir::entryList().
For example, the following iterator could be used to iterate over audio files:
Definition at line 475 of file qdiriterator.cpp.
QDirIterator::~QDirIterator | ( | ) |
Destroys the QDirIterator.
Definition at line 484 of file qdiriterator.cpp.
QFileInfo QDirIterator::fileInfo | ( | ) | const |
Returns a QFileInfo for the current directory entry.
Definition at line 574 of file qdiriterator.cpp.
QString QDirIterator::fileName | ( | ) | const |
Returns the file name for the current directory entry, without the path prepended.
This function is convenient when iterating a single directory. When using the QDirIterator::Subdirectories flag, you can use filePath() to get the full path.
Definition at line 554 of file qdiriterator.cpp.
QString QDirIterator::filePath | ( | ) | const |
Returns the full file path for the current directory entry.
Definition at line 564 of file qdiriterator.cpp.
bool QDirIterator::hasNext | ( | ) | const |
Returns true
if there is at least one more entry in the directory; otherwise, false is returned.
Definition at line 532 of file qdiriterator.cpp.
QString QDirIterator::next | ( | ) |
Advances the iterator to the next entry, and returns the file path of this new entry. If hasNext() returns false
, this function does nothing, and returns an empty QString.
You can call fileName() or filePath() to get the current entry's file name or path, or fileInfo() to get a QFileInfo for the current entry.
Call nextFileInfo() instead of next() if you're interested in the QFileInfo.
Definition at line 500 of file qdiriterator.cpp.
QFileInfo QDirIterator::nextFileInfo | ( | ) |
Advances the iterator to the next entry, and returns the file info of this new entry. If hasNext() returns false
, this function does nothing, and returns an empty QFileInfo.
You can call fileName() or filePath() to get the current entry's file name or path, or fileInfo() to get a QFileInfo for the current entry.
Call next() instead of nextFileInfo() when all you need is the filePath().
Definition at line 520 of file qdiriterator.cpp.
QString QDirIterator::path | ( | ) | const |
Returns the base directory of the iterator.
Definition at line 582 of file qdiriterator.cpp.
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friend |
Definition at line 84 of file qdiriterator.h.