QDirIterator class provides an iterator for directory entrylists. 更多...
| 头： | #include <QDirIterator> |
| qmake: | QT += core |
| Since: | Qt 4.3 |
| enum | IteratorFlag { NoIteratorFlags, Subdirectories, FollowSymlinks } |
| flags | IteratorFlags |
| QDirIterator (const QDir & dir , IteratorFlags flags = NoIteratorFlags) | |
| QDirIterator (const QString & path , IteratorFlags flags = NoIteratorFlags) | |
| QDirIterator (const QString & path , QDir::Filters 过滤 , IteratorFlags flags = NoIteratorFlags) | |
| QDirIterator (const QString & path , const QStringList & nameFilters , QDir::Filters 过滤 = QDir::NoFilter, IteratorFlags flags = NoIteratorFlags) | |
| ~QDirIterator () | |
| QFileInfo | fileInfo () const |
| QString | fileName () const |
| QString | filePath () const |
| bool | hasNext () const |
| QString | next () |
| QString | path () const |
QDirIterator class provides an iterator for directory entrylists.
可以使用 QDirIterator to navigate entries of a directory one at a time. It is similar to QDir::entryList () 和 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.
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:
QDirIterator it("/etc", QDirIterator::Subdirectories); while (it.hasNext()) { qDebug() << it.next(); // /etc/. // /etc/.. // /etc/X11 // /etc/X11/fs // ... }
Here's how to find and read all files filtered by name, recursively:
QDirIterator it("/sys", QStringList() << "scaling_cur_freq", QDir::NoFilter, QDirIterator::Subdirectories); while (it.hasNext()) { QFile f(it.next()); f.open(QIODevice::ReadOnly); qDebug() << f.fileName() << f.readAll().trimmed().toDouble() / 1000 << "MHz"; }
next () function returns the path to the next directory entry and advances the iterator. You can also call filePath () to get the current file path without advancing the iterator. The fileName () function returns only the name of the file, similar to how QDir::entryList () works. You can also call fileInfo () to get a QFileInfo for the current entry.
Unlike Qt's container iterators, QDirIterator is uni-directional (i.e., you cannot iterate directories in reverse order) and does not allow random access.
另请参阅 QDir and QDir::entryList ().
This enum describes flags that you can combine to configure the behavior of QDirIterator .
| 常量 | 值 | 描述 |
|---|---|---|
QDirIterator::NoIteratorFlags
|
0x0
|
The default value, representing no flags. The iterator will return entries for the assigned path. |
QDirIterator::Subdirectories
|
0x2
|
List entries inside all subdirectories as well. |
QDirIterator::FollowSymlinks
|
0x1
|
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. |
IteratorFlags 类型是 typedef 对于 QFlags <IteratorFlag>。它存储 IteratorFlag 值的 OR 组合。
构造 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.
默认情况下， flags is NoIteratorFlags , which provides the same behavior as in QDir::entryList ().
The sorting in dir 被忽略。
注意： To list symlinks that point to non existing files, QDir::System must be passed to the flags.
另请参阅 hasNext (), next ()，和 IteratorFlags .
构造 QDirIterator that can iterate over path . You can pass options via flags to decide how the directory should be iterated.
默认情况下， flags is NoIteratorFlags , which provides the same behavior as in QDir::entryList ().
注意： To list symlinks that point to non existing files, QDir::System must be passed to the flags.
另请参阅 hasNext (), next ()，和 IteratorFlags .
构造 QDirIterator that can iterate over path , with no name filtering and 过滤 for entry filtering. You can pass options via flags to decide how the directory should be iterated.
默认情况下， 过滤 is QDir::NoFilter ，和 flags is NoIteratorFlags , which provides the same behavior as in QDir::entryList ().
注意： To list symlinks that point to non existing files, QDir::System must be passed to the flags.
另请参阅 hasNext (), next ()，和 IteratorFlags .
构造 QDirIterator that can iterate over path ，使用 nameFilters and 过滤 . You can pass options via flags to decide how the directory should be iterated.
默认情况下， flags is NoIteratorFlags , which provides the same behavior as QDir::entryList ().
注意： To list symlinks that point to non existing files, QDir::System must be passed to the flags.
另请参阅 hasNext (), next ()，和 IteratorFlags .
销毁 QDirIterator .
返回 QFileInfo for the current directory entry.
另请参阅 filePath () 和 fileName ().
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.
另请参阅 filePath () 和 fileInfo ().
Returns the full file path for the current directory entry.
另请参阅 fileInfo () 和 fileName ().
返回
true
if there is at least one more entry in the directory; otherwise, false is returned.
另请参阅 next (), fileName (), filePath ()，和 fileInfo ().
Advances the iterator to the next entry, and returns the file path of this new entry. If
hasNext
() 返回
false
, this function does nothing, and returns an empty
QString
.
可以调用 fileName () 或 filePath () to get the current entry file name or path, or fileInfo () to get a QFileInfo for the current entry.
另请参阅 hasNext (), fileName (), filePath ()，和 fileInfo ().
Returns the base directory of the iterator.
