QT脚本学习笔记

QT脚本学习笔记

博客分类： 
• 叫屁屁还是叫加加 ⊙﹏⊙ c++

qt 脚本 

QT脚本学习笔记 

---》QT执行脚本 
QScriptEngine myEngine; 
QScriptValue three = myEngine.evaluate("function test(){var a=5;return a} test();"); 
qDebug()<<three.toNumber();//5 

---》QT对象到脚本对象转换过程（js访问QT对象） 
qt对象--》QScriptValue（qt包装对象）--》脚本对象 

#include <QtGui> 
#include <QtScript> 

int main(int argc, char *argv[]) 
{ 
QApplication app(argc, argv); 
QTextCodec::setCodecForTr(QTextCodec::codecForLocale()); 
QLabel label("xxx"); 
QScriptEngine myEngine; 
QScriptValue scriptLabel= myEngine.newQObject(&label);//生成qt对象的包装对象 
myEngine.globalObject().setProperty("myLabel", scriptLabel);//在脚本全局中声明myLable对象，把qt的包装对象关联到脚本对象 
myEngine.evaluate("myLabel.setText('yyyy');");//在脚本中改变属性 
qDebug()<<label.text();//yyyy 
return app.exec(); 
} 

---》通过信号槽使用 js 中的函数 

//QString fun = "(function(){print('hello world')})";  //方式一 
QString fun = "f = function (){print('hello world')}"; //方式二 
QScriptEngine myEngine; 
QScriptValue sctiptFun = myEngine.evaluate(fun); 

QPushButton button("click"); 
qScriptConnect(&button,SIGNAL(clicked()),myEngine.globalObject(),sctiptFun); 
button.show(); 

---》qt直接调用js中的方法 
QString script = "var obj = {test :function(){print('hello world');}}; "; 
QScriptEngine myEngine; 
myEngine.evaluate(script); 
QScriptValue global = myEngine.globalObject(); 
QScriptValue fun = global.property("obj").property("test"); 
fun.call(global); 

---》js中连接信号与槽 
QScriptEngine myEngine; 
//QString scriptStr("function test(){print('hello world');} btn.clicked.connect(this,test) "); 
QString scriptStr("var obj = {test :function(){print('hello world');}}; btn.clicked.connect(obj,'test') "); 
QPushButton button("click"); 
QScriptValue btn = myEngine.newQObject(&button); 
myEngine.globalObject().setProperty("btn",btn); 
myEngine.evaluate(scriptStr); 
button.show(); 

参考：http://blog.163.com/jx_yp/blog/static/119704459201111145400203/ 
http://blog.163.com/jx_yp/blog/static/119704459201111145411698/ 
http://blog.163.com/jx_yp/blog/static/11970445920111114542128/