Qt获取系统相关位置

在使用比如打开文件对话框（QFileDialog）时，想让其打开位置位于用户桌面等位置

Qt为我们提供了函数，使其实现起来十分方便

首先要引用头文件

#include <QDesktopServices>

然后可以通过如下语句获取不同的路径

QString QStandardPaths::writableLocation(StandardLocation type)

也可以通过一下语句获取路径下的文件和文件夹

QStringList QStandardPaths::standardLocations(StandardLocation type)

参数为路径名字的指代值，列表如下

QStandardPaths::DesktopLocation	0	Returns the user's desktop directory.
QStandardPaths::DocumentsLocation	1	Returns the user's document.
QStandardPaths::FontsLocation	2	Returns the user's fonts.
QStandardPaths::ApplicationsLocation	3	Returns the user's applications.
QStandardPaths::MusicLocation	4	Returns the user's music.
QStandardPaths::MoviesLocation	5	Returns the user's movies.
QStandardPaths::PicturesLocation	6	Returns the user's pictures.
QStandardPaths::TempLocation	7	Returns the system's temporary directory.
QStandardPaths::HomeLocation	8	Returns the user's home directory.
QStandardPaths::DataLocation	9	Returns a directory location where persistent application data can be stored. QCoreApplication::organizationName and QCoreApplication::applicationName are appended to the directory location returned for GenericDataLocation.
QStandardPaths::CacheLocation	10	Returns a directory location where user-specific non-essential (cached) data should be written.
QStandardPaths::GenericCacheLocation	15	Returns a directory location where user-specific non-essential (cached) data, shared across applications, should be written.
QStandardPaths::GenericDataLocation	11	Returns a directory location where persistent data shared across applications can be stored.
QStandardPaths::RuntimeLocation	12	Returns a directory location where runtime communication files should be written. For instance unix local sockets.
QStandardPaths::ConfigLocation	13	Returns a directory location where user-specific configuration files should be written.
QStandardPaths::DownloadLocation	14	Returns a directory for user's downloaded files.