QScriptContextInfo Class
The QScriptContextInfo class provides additional information about a QScriptContext. 更多...
| 头文件: | #include <QScriptContextInfo> |
| qmake: | QT += script |
| 开始支持版本: | Qt 4.4 |
公有类型
| enum | FunctionType { ScriptFunction, QtFunction, QtPropertyFunction, NativeFunction } |
公有函数
| QScriptContextInfo(const QScriptContext *context) | |
| QScriptContextInfo(const QScriptContextInfo &other) | |
| QScriptContextInfo() | |
| ~QScriptContextInfo() | |
| QString | fileName() const |
| int | functionEndLineNumber() const |
| int | functionMetaIndex() const |
| QString | functionName() const |
| QStringList | functionParameterNames() const |
| int | functionStartLineNumber() const |
| FunctionType | functionType() const |
| bool | isNull() const |
| int | lineNumber() const |
| qint64 | scriptId() const |
| bool | operator!=(const QScriptContextInfo &other) const |
| QScriptContextInfo & | operator=(const QScriptContextInfo &other) |
| bool | operator==(const QScriptContextInfo &other) const |
相关非成员
| QDataStream & | operator<<(QDataStream &stream, const QScriptContextInfo &info) |
| QDataStream & | operator>>(QDataStream &stream, QScriptContextInfo &info) |
详细描述
The QScriptContextInfo class provides additional information about a QScriptContext.
QScriptContextInfo is typically used for debugging purposes. It can provide information about the code being executed, such as the type of the called function, and the original source code location of the current statement.
If the called function is executing Qt Script code, you can obtain the script location with the functions fileName() and lineNumber().
You can obtain the starting line number and ending line number of a Qt Script function definition with functionStartLineNumber() and functionEndLineNumber(), respectively.
For Qt Script functions and Qt methods (e.g. slots), you can call functionParameterNames() to get the names of the formal parameters of the function.
For Qt methods and Qt property accessors, you can obtain the index of the underlying QMetaMethod or QMetaProperty by calling functionMetaIndex().
参见 QScriptContext and QScriptEngineAgent.
成员类型
enum QScriptContextInfo::FunctionType
This enum specifies the type of function being called.
| Constant | Value | Description |
|---|---|---|
QScriptContextInfo::ScriptFunction | 0 | The function is a Qt Script function, i.e. it was defined through a call to QScriptEngine::evaluate(). |
QScriptContextInfo::QtFunction | 1 | The function is a Qt function (a signal, slot or method). |
QScriptContextInfo::QtPropertyFunction | 2 | The function is a Qt property getter or setter. |
QScriptContextInfo::NativeFunction | 3 | The function is a built-in Qt Script function, or it was defined through a call to QScriptEngine::newFunction(). |
成员函数
QScriptContextInfo::QScriptContextInfo(const QScriptContext *context)
Constructs a new QScriptContextInfo from the given context.
The relevant information is extracted from the context at construction time; i.e. if you continue script execution in the context, the new state of the context will not be reflected in a previously created QScriptContextInfo.
QScriptContextInfo::QScriptContextInfo(const QScriptContextInfo &other)
Constructs a new QScriptContextInfo from the other info.
QScriptContextInfo::QScriptContextInfo()
Constructs a null QScriptContextInfo.
参见 isNull().
QScriptContextInfo::~QScriptContextInfo()
Destroys the QScriptContextInfo.
QString QScriptContextInfo::fileName() const
Returns the name of the file where the code being executed was defined, if available; otherwise returns an empty string.
For Qt Script code, this function returns the fileName argument that was passed to QScriptEngine::evaluate().
参见 lineNumber() and functionName().
int QScriptContextInfo::functionEndLineNumber() const
Returns the line number where the definition of the called function ends, or -1 if the line number is not available.
The ending line number is only available if the functionType() is ScriptFunction.
参见 functionStartLineNumber().
int QScriptContextInfo::functionMetaIndex() const
Returns the meta index of the called function, or -1 if the meta index is not available.
The meta index is only available if the functionType() is QtFunction or QtPropertyFunction. For QtFunction, the meta index can be passed to QMetaObject::method() to obtain the corresponding method definition; for QtPropertyFunction, the meta index can be passed to QMetaObject::property() to obtain the corresponding property definition.
参见 QScriptContext::thisObject().
QString QScriptContextInfo::functionName() const
Returns the name of the called function, or an empty string if the name is not available.
For script functions of type QtPropertyFunction, this function always returns the name of the property; you can use QScriptContext::argumentCount() to differentiate between reads and writes.
参见 fileName() and functionType().
QStringList QScriptContextInfo::functionParameterNames() const
Returns the names of the formal parameters of the called function, or an empty QStringList if the parameter names are not available.
参见 QScriptContext::argument().
int QScriptContextInfo::functionStartLineNumber() const
Returns the line number where the definition of the called function starts, or -1 if the line number is not available.
The starting line number is only available if the functionType() is ScriptFunction.
参见 functionEndLineNumber() and fileName().
FunctionType QScriptContextInfo::functionType() const
Returns the type of the called function.
参见 functionName() and QScriptContext::callee().
bool QScriptContextInfo::isNull() const
Returns true if this QScriptContextInfo is null, i.e. does not contain any information.
int QScriptContextInfo::lineNumber() const
Returns the line number corresponding to the statement being executed, or -1 if the line number is not available.
The line number is only available if Qt Script code is being executed.
参见 columnNumber() and fileName().
qint64 QScriptContextInfo::scriptId() const
Returns the ID of the script where the code being executed was defined, or -1 if the ID is not available (i.e. a native function is being executed).
参见 QScriptEngineAgent::scriptLoad().
bool QScriptContextInfo::operator!=(const QScriptContextInfo &other) const
Returns true if this QScriptContextInfo is not equal to the other info, otherwise returns false.
QScriptContextInfo &QScriptContextInfo::operator=(const QScriptContextInfo &other)
Assigns the other info to this QScriptContextInfo, and returns a reference to this QScriptContextInfo.
bool QScriptContextInfo::operator==(const QScriptContextInfo &other) const
Returns true if this QScriptContextInfo is equal to the other info, otherwise returns false.
相关非成员
QDataStream &operator<<(QDataStream &stream, const QScriptContextInfo &info)
Writes the given info to the specified stream.
This function was introduced in Qt 4.4.
QDataStream &operator>>(QDataStream &stream, QScriptContextInfo &info)
Reads a QScriptContextInfo from the specified stream into the given info.
This function was introduced in Qt 4.4.