# QScriptEngineAgent Class Reference
## [[QtScript](index.htm) module]
该QScriptEngineAgent类提供了一个接口来报告有关事件[QScriptEngine](qscriptengine.html)执行。[More...](#details)
### Types
* `enum Extension { DebuggerInvocationRequest }`
### Methods
* `__init__ (self, QScriptEngine engine)`
* `contextPop (self)`
* `contextPush (self)`
* `QScriptEngine engine (self)`
* `exceptionCatch (self, int scriptId, QScriptValue exception)`
* `exceptionThrow (self, int scriptId, QScriptValue exception, bool hasHandler)`
* `QVariant extension (self, Extension extension, QVariant argument = QVariant())`
* `functionEntry (self, int scriptId)`
* `functionExit (self, int scriptId, QScriptValue returnValue)`
* `positionChange (self, int scriptId, int lineNumber, int columnNumber)`
* `scriptLoad (self, int id, QString program, QString fileName, int baseLineNumber)`
* `scriptUnload (self, int id)`
* `bool supportsExtension (self, Extension extension)`
* * *
## Detailed Description
该QScriptEngineAgent类提供了一个接口来报告有关事件[QScriptEngine](qscriptengine.html)执行。
该QScriptEngineAgent类是用来监视和/或控制的一个执行工具的基础[QScriptEngine](qscriptengine.html)如调试器和分析器。
为了处理脚本加载和卸载事件，重新实现[scriptLoad](qscriptengineagent.html#scriptLoad)（）和[scriptUnload](qscriptengineagent.html#scriptUnload)（）函数。[scriptLoad](qscriptengineagent.html#scriptLoad)（）被输入到后称为[QScriptEngine.evaluate](qscriptengine.html#evaluate)（ ）已经被解析，执行给定的脚本权利之前。该引擎可为每个脚本一个ID ，它可作为一个参数来[scriptLoad](qscriptengineagent.html#scriptLoad)（）;随后，其它事件处理程序可以使用该ID来识别特定的脚本。一个常见的用法[scriptLoad](qscriptengineagent.html#scriptLoad)（ ）是保留的脚本文本，文件名和底线号（原输入[QScriptEngine.evaluate](qscriptengine.html#evaluate)（）），以使其他的事件处理程序可以例如一个行号映射到文本的相应的行。
[scriptUnload](qscriptengineagent.html#scriptUnload)（ ）被调用时，[QScriptEngine](qscriptengine.html)已经不再使用的脚本;的QScriptEngineAgent可能在这一点上安全地丢弃任何与脚本（如脚本文本）相关联的资源。注意，后[scriptUnload](qscriptengineagent.html#scriptUnload)（ ）被调用时，[QScriptEngine](qscriptengine.html)可重复使用相关的脚本ID为新脚本（即作为参数传递给后续调用[scriptLoad](qscriptengineagent.html#scriptLoad)（））。
评价下面的脚本将导致[scriptUnload](qscriptengineagent.html#scriptUnload)（ ）被调用的评估完成后立即：
```
var a = Math.random() + 2;
```
评价下面的脚本将\ B { }不导致调用[scriptUnload](qscriptengineagent.html#scriptUnload)（ ）当评估完成：
```
function cube(a) {
return a * a * a;
}
var a = cube(3);
```
该脚本不被卸载，因为它定义了一个函数（`cube`）保留在脚本环境评估已完成。如果后续的脚本中删除该`cube`功能（例如，通过将其设置为`null`） ，[scriptUnload](qscriptengineagent.html#scriptUnload)（ ）当函数被垃圾收集会被调用。一般而言，一个脚本不卸载，直到发动机已确定没有其内容被引用。
处理脚本函数调用和返回，重新实现[functionEntry](qscriptengineagent.html#functionEntry)（）和[functionExit](qscriptengineagent.html#functionExit)（）函数。[functionEntry](qscriptengineagent.html#functionEntry)（ ）当一个脚本函数将要执行的调用;[functionExit](qscriptengineagent.html#functionExit)（）被调用时，一个脚本函数即将返回，无论是正常还是由于异常。
为了处理单个脚本语句，重新实现[positionChange](qscriptengineagent.html#positionChange)（ ） 。[positionChange](qscriptengineagent.html#positionChange)（）被调用每次引擎将要执行的脚本的一个新的语句，因此提供的脚本监控的最好水平。
为了处理异常，重新实现[exceptionThrow](qscriptengineagent.html#exceptionThrow)（）和[exceptionCatch](qscriptengineagent.html#exceptionCatch)（ ） 。[exceptionThrow](qscriptengineagent.html#exceptionThrow)（）被调用时，一个脚本异常被抛出，它已被处理之前。[exceptionCatch](qscriptengineagent.html#exceptionCatch)（ ）被调用时，一个异常处理程序存在，并执行将在处理程序代码将被收回。
* * *
## Type Documentation
```
QScriptEngineAgent.Extension
```
这个枚举指定可能的扩展到[QScriptEngineAgent](qscriptengineagent.html)。
| Constant | Value | Description |
| --- | --- | --- |
| `QScriptEngineAgent.DebuggerInvocationRequest` | `0` | 代理手柄`debugger`脚本语句。 |
**See also** [extension](qscriptengineagent.html#extension)（ ） 。
* * *
## Method Documentation
```
QScriptEngineAgent.__init__ (self, QScriptEngine engine)
```
该_engine_的说法，如果不是没有，原因_self_通过Qt的，而不是PyQt的拥有。
构造一个[QScriptEngineAgent](qscriptengineagent.html)对象为给定的_engine_。
该发动机采用了代理的所有权。
Call [QScriptEngine.setAgent](qscriptengine.html#setAgent)（ ）使本剂中的活性剂。
```
QScriptEngineAgent.contextPop (self)
```
在当前脚本上下文将要弹出这个函数被调用。
默认实现不执行任何操作。
**See also** [contextPush](qscriptengineagent.html#contextPush)（）和[functionExit](qscriptengineagent.html#functionExit)（ ） 。
```
QScriptEngineAgent.contextPush (self)
```
这个函数被调用时，一个新的脚本上下文一直推。
默认实现不执行任何操作。
**See also** [contextPop](qscriptengineagent.html#contextPop)（）和[functionEntry](qscriptengineagent.html#functionEntry)（ ） 。
```
QScriptEngine QScriptEngineAgent.engine (self)
```
[](qscriptengine.html)
[返回](qscriptengine.html)[QScriptEngine](qscriptengine.html)此代理相关联。
```
QScriptEngineAgent.exceptionCatch (self, int scriptId, QScriptValue exception)
```
这个函数被调用的时候给出_exception_即将被捕获，在所确定的脚本_scriptId_。
如果你想处理此事件重新实现这个函数。
默认实现不执行任何操作。
**See also** [exceptionThrow](qscriptengineagent.html#exceptionThrow)（ ） 。
```
QScriptEngineAgent.exceptionThrow (self, int scriptId, QScriptValue exception, bool hasHandler)
```
这个函数被调用的时候给出_exception_发生在发动机，在所确定的脚本_scriptId_。如果异常是由本地的Qt脚本函数抛出，_scriptId_是-1。
If _hasHandler_诚然，有一个`catch` or `finally`块将处理该异常。如果_hasHandler_是假的，没有异常处理程序。
如果你想处理此事件重新实现这个函数。例如，一个调试器可以当一个未捕获的异常发生时通知用户（即_hasHandler_是假的） 。
默认实现不执行任何操作。
**See also** [exceptionCatch](qscriptengineagent.html#exceptionCatch)（ ） 。
```
QVariant QScriptEngineAgent.extension (self, Extension extension, QVariant argument = QVariant())
```
这个虚函数可以在重新实现[QScriptEngineAgent](qscriptengineagent.html)子类以提供扩展的支持。可选的_argument_可以作为输入提供给_extension_;结果必须在一个形式被返回[QVariant](qvariant.html)。您可以致电[supportsExtension](qscriptengineagent.html#supportsExtension)（ ）来检查一个扩展是支持的[QScriptEngineAgent](qscriptengineagent.html)。默认情况下，没有扩展名的支持，这个函数返回一个无效[QVariant](qvariant.html)。
如果实现[DebuggerInvocationRequest](qscriptengineagent.html#Extension-enum)扩展， Qt的脚本会调用这个函数时，`debugger`语句在脚本中遇到的问题。该_argument_是[QVariantList](qvariant.html#QVariantList-typedef)包含三个项目：第一个项目是scriptId （长） ，第二项是行数（一个int ） ，第三项是列数（一个整数） 。
**See also** [supportsExtension](qscriptengineagent.html#supportsExtension)（ ） 。
```
QScriptEngineAgent.functionEntry (self, int scriptId)
```
这个函数被调用时，一个脚本函数被调用的引擎。如果脚本的功能是不是原生的Qt脚本功能，它驻留在确定脚本_scriptId_否则，_scriptId_是-1。
这个函数被调用执行脚本函数的开始之前。你可以得到[QScriptContext](qscriptcontext.html)与函数调用相关[QScriptEngine.currentContext](qscriptengine.html#currentContext)（ ） 。可传递给函数的参数。
重新实现这个函数来处理此事件。例如，一个调试器的实现可以重新实现这个函数（和[functionExit](qscriptengineagent.html#functionExit)（））来跟踪调用堆栈和提供步骤，以上的功能。
默认实现不执行任何操作。
**See also** [functionExit](qscriptengineagent.html#functionExit)（ ）[positionChange](qscriptengineagent.html#positionChange)（）和[QScriptEngine.currentContext](qscriptengine.html#currentContext)（ ） 。
```
QScriptEngineAgent.functionExit (self, int scriptId, QScriptValue returnValue)
```
当目前执行的脚本函数即将返回该函数被调用。如果脚本的功能是不是原生的Qt脚本功能，它驻留在确定脚本_scriptId_否则，_scriptId_是-1。该_returnValue_是脚本函数将返回值。
只是脚本函数返回之前调用此函数。您仍然可以访问[QScriptContext](qscriptcontext.html)与脚本函数调用相关联[QScriptEngine.currentContext](qscriptengine.html#currentContext)（ ） 。
如果发动机的[hasUncaughtException](qscriptengine.html#hasUncaughtException)（ ）函数返回True ，脚本函数退出，由于异常，否则，脚本函数正常返回。
重新实现这个函数来处理此事件，通常你会那么还需要重新实现[functionEntry](qscriptengineagent.html#functionEntry)（ ） 。
默认实现不执行任何操作。
**See also** [functionEntry](qscriptengineagent.html#functionEntry)（）和[QScriptEngine.hasUncaughtException](qscriptengine.html#hasUncaughtException)（ ） 。
```
QScriptEngineAgent.positionChange (self, int scriptId, int lineNumber, int columnNumber)
```
这个函数被调用当发动机即将在确定脚本执行一个新的语句_scriptId_。该语句开始由指定的行和列_lineNumber_是不是原生的Qt脚本函数生成此事件。
重新实现这个函数来处理此事件。例如，一个调试器的实现可以重新实现这个功能，提供线，由线步进，和一个分析器实现可以用它来计算被执行每个语句的次数。
默认实现不执行任何操作。
**Note:** _columnNumber_未定义
**See also** [scriptLoad](qscriptengineagent.html#scriptLoad)（）和[functionEntry](qscriptengineagent.html#functionEntry)（ ） 。
```
QScriptEngineAgent.scriptLoad (self, int id, QString program, QString fileName, int baseLineNumber)
```
这个函数被调用时，引擎解析的脚本，并与给定关联的它_id_。该ID可以用来识别在随后的事件通知这个特定的脚本。
_program_，_fileName_和_baseLineNumber_是原始参数的[QScriptEngine.evaluate](qscriptengine.html#evaluate)（ ）调用触发此事件。
这个函数被调用之前的脚本即将进行评估。
您可以重新实现此功能来记录关于脚本的信息，例如，通过保留脚本文本，你可以得到的文本行对应于一个后续调用一个行号[positionChange](qscriptengineagent.html#positionChange)（ ） 。
默认实现不执行任何操作。
**See also** [scriptUnload](qscriptengineagent.html#scriptUnload)（ ） 。
```
QScriptEngineAgent.scriptUnload (self, int id)
```
这个函数被调用时，引擎已经丢弃确定给定的脚本_id_。
您可以重新实现这个函数来清除任何已与脚本相关的资源。
默认实现不执行任何操作。
**See also** [scriptLoad](qscriptengineagent.html#scriptLoad)（ ） 。
```
bool QScriptEngineAgent.supportsExtension (self, Extension extension)
```
返回True如果[QScriptEngineAgent](qscriptengineagent.html)支持给定_extension_否则，则返回False。默认情况下，没有扩展名的支持。
**See also** [extension](qscriptengineagent.html#extension)（ ） 。
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- QPyNullVariant Class Reference
- QPyTextObject Class Reference
- QQuaternion Class Reference
- QRadialGradient Class Reference
- QRadioButton Class Reference
- QRawFont Class Reference
- QReadLocker Class Reference
- QReadWriteLock Class Reference
- QRect Class Reference
- QRectF Class Reference
- QRegExp Class Reference
- QRegExpValidator Class Reference
- QRegion Class Reference
- QResizeEvent Class Reference
- QResource Class Reference
- QRubberBand Class Reference
- QRunnable Class Reference
- QScriptClass Class Reference
- QScriptClassPropertyIterator Class Reference
- QScriptContext Class Reference
- QScriptContextInfo Class Reference
- QScriptEngine Class Reference
- QScriptEngineAgent Class Reference
- QScriptEngineDebugger Class Reference
- QScriptString Class Reference
- QScriptSyntaxCheckResult Class Reference
- QScriptValue Class Reference
- QScriptValueIterator Class Reference
- QScrollArea Class Reference
- QScrollBar Class Reference
- QSemaphore Class Reference
- QSequentialAnimationGroup Class Reference
- QSessionManager Class Reference
- QSettings Class Reference
- QSharedMemory Class Reference
- QShortcut Class Reference
- QShortcutEvent Class Reference
- QShowEvent Class Reference
- QSignalMapper Class Reference
- QSignalTransition Class Reference
- QSimpleXmlNodeModel Class Reference
- QSize Class Reference
- QSizeF Class Reference
- QSizeGrip Class Reference
- QSizePolicy Class Reference
- QSlider Class Reference
- QSocketNotifier Class Reference
- QSortFilterProxyModel Class Reference
- QSound Class Reference
- QSourceLocation Class Reference
- QSpacerItem Class Reference
- QSpinBox Class Reference
- QSplashScreen Class Reference
- QSplitter Class Reference
- QSplitterHandle Class Reference
- QSql Class Reference
- QSqlDatabase Class Reference
- QSqlDriver Class Reference
- QSqlDriverCreatorBase Class Reference
- QSqlError Class Reference
- QSqlField Class Reference
- QSqlIndex Class Reference
- QSqlQuery Class Reference
- QSqlQueryModel Class Reference
- QSqlRecord Class Reference
- QSqlRelation Class Reference
- QSqlRelationalDelegate Class Reference
- QSqlRelationalTableModel Class Reference
- QSqlResult Class Reference
- QSqlTableModel Class Reference
- Qt4.7文档翻译：Qt样式单参考,Qt Style Sheets Reference
- QSsl Class Reference
- QSslCertificate Class Reference
- QSslCipher Class Reference
- QSslConfiguration Class Reference
- QSslError Class Reference
- QSslKey Class Reference
- QSslSocket Class Reference
- QStackedLayout Class Reference
- QStackedWidget Class Reference
- QStandardItem Class Reference
- QStandardItemModel Class Reference
- QState Class Reference
- QStateMachine Class Reference
- QStaticText Class Reference
- QStatusBar Class Reference
- QStatusTipEvent Class Reference
- QString Class Reference
- QStringList Class Reference
- QStringListModel Class Reference
- QStringMatcher Class Reference
- QStringRef Class Reference
- QStyle Class Reference
- QStyledItemDelegate Class Reference
- QStyleFactory Class Reference
- QStyleHintReturn Class Reference
- QStyleHintReturnMask Class Reference
- QStyleHintReturnVariant Class Reference
- QStyleOption Class Reference
- QStyleOptionButton Class Reference
- QStyleOptionComboBox Class Reference
- QStyleOptionComplex Class Reference
- QStyleOptionDockWidget Class Reference
- QStyleOptionDockWidgetV2 Class Reference
- QStyleOptionFocusRect Class Reference
- QStyleOptionFrame Class Reference
- QStyleOptionFrameV2 Class Reference
- QStyleOptionFrameV3 Class Reference
- QStyleOptionGraphicsItem Class Reference
- QStyleOptionGroupBox Class Reference
- QStyleOptionHeader Class Reference
- QStyleOptionMenuItem Class Reference
- QStyleOptionProgressBar Class Reference
- QStyleOptionProgressBarV2 Class Reference
- QStyleOptionRubberBand Class Reference
- QStyleOptionSizeGrip Class Reference
- QStyleOptionSlider Class Reference
- QStyleOptionSpinBox Class Reference
- QStyleOptionTab Class Reference
- QStyleOptionTabBarBase Class Reference
- QStyleOptionTabBarBaseV2 Class Reference
- QStyleOptionTabV2 Class Reference
- QStyleOptionTabV3 Class Reference
- QStyleOptionTabWidgetFrame Class Reference
- QStyleOptionTabWidgetFrameV2 Class Reference
- QStyleOptionTitleBar Class Reference
- QStyleOptionToolBar Class Reference
- QStyleOptionToolBox Class Reference
- QStyleOptionToolBoxV2 Class Reference
- QStyleOptionToolButton Class Reference
- QStyleOptionViewItem Class Reference
- QStyleOptionViewItemV2 Class Reference
- QStyleOptionViewItemV3 Class Reference
- QStyleOptionViewItemV4 Class Reference
- QStylePainter Class Reference
- QSvgGenerator Class Reference
- QSvgRenderer Class Reference
- QSvgWidget Class Reference
- QSwipeGesture Class Reference
- QSyntaxHighlighter Class Reference
- QSysInfo Class Reference
- QSystemLocale Class Reference
- QSystemSemaphore Class Reference
- QSystemTrayIcon Class Reference
- Qt Class Reference
- QTabBar Class Reference
- QTabletEvent Class Reference
- QTableView Class Reference
- QTableWidget Class Reference
- QTableWidgetItem Class Reference
- QTableWidgetSelectionRange Class Reference
- QTabWidget Class Reference
- QTapAndHoldGesture Class Reference
- QTapGesture Class Reference
- QTcpServer Class Reference
- 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