Qt獲取系統相關位置

在使用比如打開文件對話框（QFileDialog）時，想讓其打開位置位於用戶桌面等位置

Qt爲我們提供了函數，使其實現起來十分方便

Qt4--Qt5用QDesktopServices;

首先要引入頭文件

#include <QDesktopServices>

然後可以通過如下語句獲取不同的路徑

static QString QDesktopServices::storageLocation(StandardLocation type);

例如：獲取桌面路徑

    //獲取桌面路徑
    QString path = QDesktopServices::storageLocation(QDesktopServices::DesktopLocation);

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Qt5以後用QStandardPaths;

首先要引用頭文件

#include <QStandardPaths>

然後可以通過如下語句獲取不同的路徑

static QString writableLocation(StandardLocation type);

也可以通過一下語句獲取路徑下的文件和文件夾(注意：該函數返回值類型是list)

static QStringList standardLocations(StandardLocation type);

例如：獲取桌面路徑

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

參數爲路徑名字的指代值，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.