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

Qt4--Qt5用QDesktopServices;

首先要引入头文件

#include <QDesktopServices>

然后可以通过如下语句获取不同的路径

static QString QDesktopServices::storageLocation(StandardLocation type);

例如：获取桌面路径

    //获取桌面路径    QString path = QDesktopServices::storageLocation(QDesktopServices::DesktopLocation);

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Qt5以后用QStandardPaths;

首先要引用头文件

#include <QStandardPaths>

然后可以通过如下语句获取不同的路径

static QString writableLocation(StandardLocation type);

也可以通过一下语句获取路径下的文件和文件夹(注意：该函数返回值类型是list)

static QStringList standardLocations(StandardLocation type);

例如：获取桌面路径

QString path = QStandardPaths::writableLocation(QStandardPaths::DesktopLocation);

参数为路径名字的指代值，列表如下

QStandardPaths::DesktopLocation0Returns the user's desktop directory.QStandardPaths::DocumentsLocation1Returns the user's document.QStandardPaths::FontsLocation2Returns the user's fonts.QStandardPaths::ApplicationsLocation3Returns the user's applications.QStandardPaths::MusicLocation4Returns the user's music.QStandardPaths::MoviesLocation5Returns the user's movies.QStandardPaths::PicturesLocation6Returns the user's pictures.QStandardPaths::TempLocation7Returns the system's temporary directory.QStandardPaths::HomeLocation8Returns the user's home directory.QStandardPaths::DataLocation9Returns 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::CacheLocation10Returns a directory location where user-specific non-essential (cached) data should be written.QStandardPaths::GenericCacheLocation15Returns a directory location where user-specific non-essential (cached) data, shared across applications, should be written.QStandardPaths::GenericDataLocation11Returns a directory location where persistent data shared across applications can be stored.QStandardPaths::RuntimeLocation12Returns a directory location where runtime communication files should be written. For instance unix local sockets.QStandardPaths::ConfigLocation13Returns a directory location where user-specific configuration files should be written.QStandardPaths::DownloadLocation14Returns a directory for user's downloaded files.