Qt Script

旧项目运行在Qt4.x上,要加上一个脚本逻辑,只能上Qt Script.(建议新项目使用QJSEngine)

QT += script

#include <QtScript>

int cpp_func(int a, int b)
{
    return a + b;
}

QScriptValue cpp_func_wrapper(QScriptContext *ctx, QScriptEngine *eng)
{
    int a = ctx->argument(0).toInt32();
    int b = ctx->argument(1).toInt32();
    return cpp_func(a, b);
}

QScriptEngine engine;
//向js中传递全局可用数据
engine.globalObject().setProperty("name", "liyangyao");
//向js中传递全局可用函数指针 (需要经过一层包装, 符合签名)
QScriptValue cpp_func_ref = engine.newFunction(cpp_func_wrapper);
engine.globalObject().setProperty("cpp_func", cpp_func_ref);

//载入js
QString script = readScript(":/script.js");
QScriptValue object = engine.evaluate(script);
if (object.isError())
{
    qDebug()<<"line:"<<object.property("lineNumber").toInt32()<<" error:"<<object.toString();
    return 0;
}

//调用js中的全局函数
qDebug()<<"execute script time:"<<time(NULL);
QScriptValue func = engine.globalObject().property("js_func");
if (func.isValid())
{
    QScriptValue result = func.call(object, QScriptValueList()<<17);
    qDebug()<<"js_func return->"<<result.toString();
    //获取js中的全局变量
    qDebug()<<"context="<< engine.globalObject().property("context").toString();
}
else{
    qDebug()<<"js_func is not valid";
}