The QTemporaryDir class creates a unique directory for temporary use. 更多...
| 头： | #include <QTemporaryDir> |
| qmake: | QT += core |
注意： 此类的所有函数 可重入 .
| QTemporaryDir () | |
| QTemporaryDir (const QString & templatePath ) | |
| ~QTemporaryDir () | |
| bool | autoRemove () const |
| QString | errorString () const |
| QString | filePath (const QString & fileName ) const |
| bool | isValid () const |
| QString | path () const |
| bool | remove () |
| void | setAutoRemove (bool b ) |
The QTemporaryDir class creates a unique directory for temporary use.
QTemporaryDir is used to create unique temporary directories safely. The directory itself is created by the constructor. The name of the temporary directory is guaranteed to be unique (i.e., you are guaranteed to not overwrite an existing directory), and the directory will subsequently be removed upon destruction of the QTemporaryDir object. The directory name is either auto-generated, or created based on a template, which is passed to QTemporaryDir 的构造函数。
范例：
// Within a function/method...
QTemporaryDir dir;
if (dir.isValid()) {
// dir.path() returns the unique directory path
}
// The QTemporaryDir destructor removes the temporary directory
// as it goes out of scope.
测试可以创建临时目录非常重要，是使用 isValid ()。不要使用 exists() , since a default-constructed QDir 表示当前存在目录。
临时目录路径的查找可以通过调用 path ().
A temporary directory will have some static part of the name and some part that is calculated to be unique. The default path will be determined from
QCoreApplication::applicationName
() (否则
qt_temp
) and will be placed into the temporary path as returned by
QDir::tempPath
(). If you specify your own path, a relative path will not be placed in the temporary directory by default, but be relative to the current working directory. In all cases, a random string will be appended to the path in order to make it unique.
另请参阅 QDir::tempPath (), QDir ，和 QTemporaryFile .
构造
QTemporaryDir
using as template the application name returned by
QCoreApplication::applicationName
() (否则
qt_temp
). The directory is stored in the system's temporary directory,
QDir::tempPath
().
另请参阅 QDir::tempPath ().
构造 QTemporaryDir with a template of templatePath .
若 templatePath is a relative path, the path will be relative to the current working directory. You can use QDir::tempPath () to construct templatePath if you want use the system's temporary directory.
若 templatePath ends with XXXXXX it will be used as the dynamic portion of the directory name, otherwise it will be appended. Unlike QTemporaryFile , XXXXXX in the middle of the template string is not supported.
另请参阅 QDir::tempPath ().
Destroys the temporary directory object. If auto remove mode was set, it will automatically delete the directory including all its contents.
另请参阅 autoRemove ().
返回
true
若
QTemporaryDir
is in auto remove mode. Auto-remove mode will automatically delete the directory from disk upon destruction. This makes it very easy to create your
QTemporaryDir
object on the stack, fill it with files, do something with the files, and finally on function return it will automatically clean up after itself.
默认情况下，开启自动移除。
另请参阅 setAutoRemove () 和 remove ().
若
isValid
() 返回
false
, this function returns the error string that explains why the creation of the temporary directory failed. Otherwise, this function return an empty string.
该函数在 Qt 5.6 引入。
Returns the path name of a file in the temporary directory. Does not check if the file actually exists in the directory. Redundant multiple separators or "." and ".." directories in fileName are not removed (see QDir::cleanPath ())。绝对路径不允许。
该函数在 Qt 5.9 引入。
返回
true
若
QTemporaryDir
创建成功。
Returns the path to the temporary directory. Empty if the QTemporaryDir could not be created.
移除临时目录，包括其下所有内容。
返回
true
若移除成功。
设置 QTemporaryDir 成自动移除模式若 b 为 true。
默认情况下，开启自动移除。
另请参阅 autoRemove () 和 remove ().