# QDesktopServices Class Reference
## [[QtGui](index.htm) module]
该QDesktopServices类提供了访问常用的桌面服务的方法。[More...](#details)
### Types
* `enum StandardLocation { DesktopLocation, DocumentsLocation, FontsLocation, ApplicationsLocation, ..., CacheLocation }`
### Methods
* `__init__ (self)`
* `__init__ (self, QDesktopServices)`
### Static Methods
* `QString displayName (StandardLocation type)`
* `bool openUrl (QUrl url)`
* `setUrlHandler (QString scheme, QObject receiver, str method)`
* `setUrlHandler (QString scheme, callable method)`
* `QString storageLocation (StandardLocation type)`
* `unsetUrlHandler (QString scheme)`
* * *
## Detailed Description
该QDesktopServices类提供了访问常用的桌面服务的方法。
许多桌面环境提供了可以被应用程序用于执行常见任务,如打开一个网页,在某种程度上,既一致,并考虑到了用户的应用程序首选项的服务。
这个类包含的功能,提供简单的界面使用这些服务,表明他们是成功还是失败。
该[openUrl](qdesktopservices.html#openUrl)( )函数用于打开位于在外部应用程序中的任意文件的URL 。对于对应的资源在本地的文件系统(其中的URL方案“文件” )上的URL ,一个合适的应用程序将被用来打开文件,否则, Web浏览器将被用来获取和显示文件。
用户的桌面设置控制某些类型的可执行文件是否被打开进行浏览,或者如果他们转而执行。一些桌面环境配置为防止执行来自非本地URL获得文件的用户,或者要求用户的权限才这样做。
### URL Handlers
的行为[openUrl](qdesktopservices.html#openUrl)( )函数可以定制个人的URL方案,允许应用程序复盖默认的处理行为对于某些类型的URL 。
调度机制允许将用于每个URL方案只有一个自定义处理程序,这是使用设置[setUrlHandler](qdesktopservices.html#setUrlHandler)()函数。每个处理程序被实现为只接受一个单一的插槽[QUrl](qurl.html)的说法。
每个计划的现有处理程序可以与被删除[unsetUrlHandler](qdesktopservices.html#unsetUrlHandler)()函数。这将返回给定的方案的默认行为的处理行为。
这个系统可以很容易地实现一个帮助系统,例如。说明可以使用标籤和文本浏览器提供**help://myapplication/mytopic**网址,并通过注册一个处理程序就能够在应用程序中显示的说明文字:
```
class MyHelpHandler : public [QObject](qobject.html)
{
Q_OBJECT
public:
...
public slots:
void showHelp(const [QUrl](qurl.html) &url);
};
QDesktopServices.setUrlHandler("help", helpInstance, "showHelp");
```
如果处理程序中你决定,你无法打开请求的URL ,你可以直接调用[QDesktopServices.openUrl](qdesktopservices.html#openUrl)( )再次使用相同的参数,它会尝试使用适当的机制,使用户的桌面环境打开URL 。
* * *
## Type Documentation
```
QDesktopServices.StandardLocation
```
该枚举描述可由QDesktopServices.storageLocation和QDesktopServices.displayName要查询的不同的位置。
| Constant | Value | Description |
| --- | --- | --- |
| `QDesktopServices.DesktopLocation` | `0` | 返回用户的桌面目录。 |
| `QDesktopServices.DocumentsLocation` | `1` | 返回用户的文档。 |
| `QDesktopServices.FontsLocation` | `2` | 返回用户的字体。 |
| `QDesktopServices.ApplicationsLocation` | `3` | 返回用户的应用程序。 |
| `QDesktopServices.MusicLocation` | `4` | 返回用户的音乐。 |
| `QDesktopServices.MoviesLocation` | `5` | 返回用户的电影。 |
| `QDesktopServices.PicturesLocation` | `6` | 返回用户的图片。 |
| `QDesktopServices.TempLocation` | `7` | 返回系统的临时目录。 |
| `QDesktopServices.HomeLocation` | `8` | 返回用户的主目录。 |
| `QDesktopServices.DataLocation` | `9` | 返回在持久应用程序数据可以被存储的目录位置。[QCoreApplication.applicationName](qcoreapplication.html#applicationName-prop)和[QCoreApplication.organizationName](qcoreapplication.html#organizationName-prop)应该在所有平台上。 |
| `QDesktopServices.CacheLocation` | `10` | 返回在用户特定的非必要(缓存)的数据应该写入的目录位置。 |
这个枚举被引入或修改的Qt 4.4 。
**See also** [storageLocation](qdesktopservices.html#storageLocation)()和[displayName](qdesktopservices.html#displayName)( ) 。
* * *
## Method Documentation
```
QDesktopServices.__init__ (self)
```
```
QDesktopServices.__init__ (self, QDesktopServices)
```
```
QString QDesktopServices.displayName (StandardLocation type)
```
返回给定位置的本地化显示名称_type_或空[QString](qstring.html)如果没有相关的位置可以找到。
```
bool QDesktopServices.openUrl (QUrl url)
```
打开给定的_url_在真实的,如果成功了适当的Web浏览器为用户的桌面环境,并返回,否则返回False 。
如果URL是参考到本地文件(例如, URL模式是“文件” ),然后将它开了一个合适的应用程序,而不是一个Web浏览器。
下面的示例打开一个文件驻留在包含空格的路径上的Windows文件系统:
```
[QDesktopServices](qdesktopservices.html).openUrl([QUrl](qurl.html)("file:///C:/Documents and Settings/All Users/Desktop", [QUrl](qurl.html).TolerantMode));
```
如果`mailto`被指定的URL ,用户的电子邮件客户端将用于打开包含在URL中,类似的方式指定的选项作曲家窗口`mailto`该书是由Web浏览器处理。
例如,下面的URL包含收件人(`user@foo.com`) ,一个主体(`Test`)和消息体(`Just a test`) :
```
mailto:user@foo.com?subject=Test&body=Just a test
```
**Warning:**虽然许多电子邮件客户端可以发送附件和识别Unicode ,用户可能没有这些功能配置他们的客户。此外,某些电子邮件客户端(如Lotus Notes)的有问题,长的URL。
**Note:**基于Symbian操作系统,`SwEvent`能力是必需的打开给定_url_如果Web浏览器已经在运行。
**See also** [setUrlHandler](qdesktopservices.html#setUrlHandler)( ) 。
```
QDesktopServices.setUrlHandler (QString scheme, QObject receiver, str method)
```
设置处理程序给定的_scheme_成为该处理程序_method_通过提供_receiver_对象。
此功能提供了一种方法来定制行为[openUrl](qdesktopservices.html#openUrl)( ) 。如果[openUrl](qdesktopservices.html#openUrl)( )被调用与指定的URL_scheme_那么给定的_method_在_receiver_对象被调用,而不是[QDesktopServices](qdesktopservices.html)启动外部应用程序。
所提供的方法必须被实现为一个时隙只接受单一[QUrl](qurl.html)的说法。
如果setUrlHandler ( )用来设置上已经有一个处理一个方案一个新的处理程序,现有的处理程序简单地替换成新的。自[QDesktopServices](qdesktopservices.html)不采取处理程序的所有权,当一个处理器被替换任何对象都将被删除。
请注意,处理程序将总是从调用同一个线程中调用[QDesktopServices.openUrl](qdesktopservices.html#openUrl)( ) 。
**See also** [openUrl](qdesktopservices.html#openUrl)()和[unsetUrlHandler](qdesktopservices.html#unsetUrlHandler)( ) 。
```
QDesktopServices.setUrlHandler (QString scheme, callable method)
```
```
QString QDesktopServices.storageLocation (StandardLocation type)
```
返回默认的系统目录下的文件_type_属于,或空字符串,如果该位置不能确定。
**Note:**返回的存储位置可以是不存在的目录,也就是说,它可能需要由系统或用户创建的。
**Note:**基于Symbian操作系统,[ApplicationsLocation](qdesktopservices.html#StandardLocation-enum)总是相同的驱动器上的可执行文件指向的/ sys / bin文件夹中。[FontsLocation](qdesktopservices.html#StandardLocation-enum)总是指向ROM驱动器上的文件夹中。 Symbian操作系统没有桌面的概念,[DesktopLocation](qdesktopservices.html#StandardLocation-enum)返回相同的路径[DocumentsLocation](qdesktopservices.html#StandardLocation-enum)。的标准位置休息指向同一个驱动器上的文件夹具有可执行,但如果可执行文件是在ROM中从C盘的文件夹被返回。
此功能被引入Qt的4.4 。
```
QDesktopServices.unsetUrlHandler (QString scheme)
```
移除先前设置的URL处理程序规定_scheme_。
**See also** [setUrlHandler](qdesktopservices.html#setUrlHandler)( ) 。
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- QTcpSocket Class Reference
- QTemporaryFile Class Reference
- QTest Class Reference
- QTextBlock Class Reference
- QTextBlockFormat Class Reference
- QTextBlockGroup Class Reference
- QTextBlockUserData Class Reference
- QTextBoundaryFinder Class Reference
- QTextBrowser Class Reference
- QTextCharFormat Class Reference
- QTextCodec Class Reference
- QTextCursor Class Reference
- QTextDecoder Class Reference
- QTextDocument Class Reference
- QTextDocumentFragment Class Reference
- QTextDocumentWriter Class Reference
- QTextEdit Class Reference
- QTextEncoder Class Reference
- QTextFormat Class Reference
- QTextFragment Class Reference
- QTextFrame Class Reference
- QTextFrameFormat Class Reference
- QTextImageFormat Class Reference
- QTextInlineObject Class Reference
- QTextItem Class Reference
- QTextLayout Class Reference
- QTextLength Class Reference
- QTextLine Class Reference
- QTextList Class Reference
- QTextListFormat Class Reference
- QTextObject Class Reference
- QTextObjectInterface Class Reference
- QTextOption Class Reference
- QTextStream Class Reference
- QTextTable Class Reference
- QTextTableCell Class Reference
- QTextTableCellFormat Class Reference
- QTextTableFormat Class Reference
- QThread Class Reference
- QThreadPool Class Reference
- QTime Class Reference
- QTimeEdit Class Reference
- QTimeLine Class Reference
- QTimer Class Reference
- QTimerEvent Class Reference
- QToolBar Class Reference
- QToolBox Class Reference
- QToolButton Class Reference
- QToolTip Class Reference
- QTouchEvent Class Reference
- Reference
- QTransform Class Reference
- QTranslator Class Reference
- QTreeView Class Reference
- QTreeWidget Class Reference
- QTreeWidgetItem Class Reference
- QTreeWidgetItemIterator Class Reference
- QUdpSocket Class Reference
- QUndoCommand Class Reference
- QUndoGroup Class Reference
- QUndoStack Class Reference
- QUndoView Class Reference
- QUrl Class Reference
- QUrlInfo Class Reference
- QUuid Class Reference
- QValidator Class Reference
- QVariant Class Reference
- QVariantAnimation Class Reference
- QVBoxLayout Class Reference
- QVector2D Class Reference
- QVector3D Class Reference
- QVector4D Class Reference
- QVideoFrame Class Reference
- QVideoSurfaceFormat Class Reference
- QWaitCondition Class Reference
- QWebDatabase Class Reference
- QWebElement Class Reference
- QWebElementCollection Class Reference
- QWebFrame Class Reference
- QWebHistory Class Reference
- QWebHistoryInterface Class Reference
- QWebHistoryItem Class Reference
- QWebHitTestResult Class Reference
- QWebInspector Class Reference
- QWebPage Class Reference
- QWebPluginFactory Class Reference
- QWebSecurityOrigin Class Reference
- QWebSettings Class Reference
- QWebView Class Reference
- QWhatsThis Class Reference
- QWhatsThisClickedEvent Class Reference
- QWheelEvent Class Reference
- QWidget Class Reference
- QWidgetAction Class Reference
- QWidgetItem Class Reference
- QWindowStateChangeEvent Class Reference
- QWizard Class Reference
- QWizardPage Class Reference
- QWorkspace Class Reference
- QWriteLocker Class Reference
- QX11EmbedContainer Class Reference
- QX11EmbedWidget Class Reference
- QX11Info Class Reference
- QXmlAttributes Class Reference
- QXmlContentHandler Class Reference
- QXmlDeclHandler Class Reference
- QXmlDefaultHandler Class Reference
- QXmlDTDHandler Class Reference
- QXmlEntityResolver Class Reference
- QXmlErrorHandler Class Reference
- QXmlFormatter Class Reference
- QXmlInputSource Class Reference
- QXmlItem Class Reference
- QXmlLexicalHandler Class Reference
- QXmlLocator Class Reference
- QXmlName Class Reference
- QXmlNamePool Class Reference
- QXmlNamespaceSupport Class Reference
- QXmlNodeModelIndex Class Reference
- QXmlParseException Class Reference
- QXmlQuery Class Reference
- QXmlReader Class Reference
- QXmlResultItems Class Reference
- QXmlSchema Class Reference
- QXmlSchemaValidator Class Reference
- QXmlSerializer Class Reference
- QXmlSimpleReader Class Reference
- QXmlStreamAttribute Class Reference
- QXmlStreamAttributes Class Reference
- QXmlStreamEntityDeclaration Class Reference
- QXmlStreamEntityResolver Class Reference
- QXmlStreamNamespaceDeclaration Class Reference
- QXmlStreamNotationDeclaration Class Reference
- QXmlStreamReader Class Reference
- QXmlStreamWriter Class Reference