proving aruments to scripting..

[prachi kamble]

hi,

following is my code

QScriptEngine engine;
        QScriptValue ctor,scriptUi,calc,scriptUi2;
 
        QString scriptFileName("./AnotherJs.js");
        QFile scriptFile(scriptFileName);
        scriptFile.open(QIODevice::ReadOnly);
        engine.evaluate(scriptFile.readAll(), scriptFileName);
        bool b1 = engine.hasUncaughtException();
        scriptFile.close();
 
        ctor = engine.evaluate("on_m_TcpSend_clicked");
        b1 = engine.hasUncaughtException();
        scriptUi = engine.newQObject(this, QScriptEngine::ScriptOwnership);
        b1 = engine.hasUncaughtException();
        calc = ctor.construct(QScriptValueList() << scriptUi);
        b1 = engine.hasUncaughtException();

QScriptEngine engine;
        QScriptValue ctor,scriptUi,calc,scriptUi2;

        QString scriptFileName("./AnotherJs.js");
        QFile scriptFile(scriptFileName);
        scriptFile.open(QIODevice::ReadOnly);
        engine.evaluate(scriptFile.readAll(), scriptFileName);
        bool b1 = engine.hasUncaughtException();
        scriptFile.close();

        ctor = engine.evaluate("on_m_TcpSend_clicked");
        b1 = engine.hasUncaughtException();
        scriptUi = engine.newQObject(this, QScriptEngine::ScriptOwnership);
        b1 = engine.hasUncaughtException();
        calc = ctor.construct(QScriptValueList() << scriptUi);
        b1 = engine.hasUncaughtException();

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here in line 11: i m creating new object giving "this" as parameter, and in line 13: i am proving the scriptui as a parameter to the ctor's constructor.
my question is if i can provide more that 1 arguments to scripting. (ex:- if i want to give this and some other object both as a parameter??)
Please answer...

[anda_skoa]

my question is if i can provide more that 1 arguments to scripting

Hint 1: the argument of construct() is called "args".
Hint 2: it is a list.

Cheers,
_

[prachi kamble]

yes, i know that, that's y i tried to provide the list of arguments, but i don't know exact syntax for it . searching for the syntax...
i tried something like this

calc = ctor.construct(QScriptValueList() << scriptUi << scriptui2);

is there any mistake in the code??

[anda_skoa]

That looks ok.

Cheers,
_

[prachi kamble]

ok... but its not giving me the expected result...
ok i try more on it...

[wysota]

What exactly are you expecting to obtain with this code? You realize you are calling a constructor of a function? This will not call the function (provided that on_m_TcpSend_clicked does evaluate to a function).

[prachi kamble]

yes, it is constructing the given function.the code above works well, it is evaluating the function and working well, it also calls the function and executes the code in it,(when i provide only one parameter). but there is a requirement to provide 2 parameters.

[wysota]

How do you evaluate those two parameters in the function?

[prachi kamble]

above written is the code in qt

following is the code in java script

function on_m_TcpSend_clicked(param1,param2)
{
this.ui = param1;
param1.SomeControl.text = "ABC"; //this line gets executed if only param1 is given as parameter
SendData(param2); //this function is written in another js file.
}

[wysota]

Have you tried checking the "arguments" object passed to the function?

function on_m_TcpSend_clicked()
{ 
this.ui = arguments[0]; 
param1.SomeControl.text = "ABC"; //this line gets executed if only param1 is given as parameter
SendData(arguments[1]); //this function is written in another js file.
}

function on_m_TcpSend_clicked()
{ 
this.ui = arguments[0]; 
param1.SomeControl.text = "ABC"; //this line gets executed if only param1 is given as parameter
SendData(arguments[1]); //this function is written in another js file.
}

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[prachi kamble]

i tried spmeting like below

code in QT:-
ctor = engine.evaluate("on_m_TcpSend_clicked");
b1 = engine.hasUncaughtException();
scriptUi = engine.newQObject(this, QScriptEngine::ScriptOwnership);
b1 = engine.hasUncaughtException();

scriptUi2 = engine.newQObject(objtcpwrapper, QScriptEngine::ScriptOwnership);
b1 = engine.hasUncaughtException();
QScriptValueList objlist;
objlist.append(scriptUi);
objlist.append(scriptUi2);
calc = ctor.construct(objlist);
b1 = engine.hasUncaughtException();

code in Java:-

function on_m_TcpSend_clicked(param)
{
this.ui = param[0];
SendData(param[1]);
}

but it is not working...

I have one more question.. can i declare a global or file lavel variable in the java script file?? if it is possible.. it will solve my issue

[wysota]

Did you try the arguments object as I told you?

[prachi kamble]

Yes sir ,I tried... Not working in java script...

[wysota]

Yes sir ,I tried... Not working in java script...

Then you tried it wrong because it is part of JavaScript specification.

https://developer.mozilla.org/en-US/...ions/arguments

[prachi kamble]

i got to know.. what u r saying is java script with HTMl, and java script with Qt has some different methods. as i have tried many thing which are perfectly working in java with htmal(ex- confirm method for msgbox, require method for TCP connection), but it gives me error while used in qt scripting. so argument method might not be working in qt .

[wysota]

This works just fine:

#include <QScriptEngine>
#include <QCoreApplication>
 
int main(int argc, char **argv) {
  QCoreApplication app(argc, argv);
  QScriptEngine engine;
  engine.evaluate("function func() { for(var i = 0; i < arguments.length; ++i) print('Arg ', i+1, ': ', arguments[i]); } func('a1', 'a2');");
  return 0;
}

#include <QScriptEngine>
#include <QCoreApplication>

int main(int argc, char **argv) {
  QCoreApplication app(argc, argv);
  QScriptEngine engine;
  engine.evaluate("function func() { for(var i = 0; i < arguments.length; ++i) print('Arg ', i+1, ': ', arguments[i]); } func('a1', 'a2');");
  return 0;
}

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[prachi kamble]

ok... that's good...
but what if i just want to give just function name and don't want to write function body while evaluating it.then??
i mean to say.. i have a js file.. in that function body is already written with 2 parameters . and want to call it from qt script and want to give parameters list there.. pls help if u know

[wysota]

but what if i just want to give just function name and don't want to write function body while evaluating it.then??
i mean to say.. i have a js file.. in that function body is already written with 2 parameters . and want to call it from qt script and want to give parameters list there.. pls help if u know

The code doesn't care where the function is defined.

[prachi kamble]

engine.evaluate("function func() { for(var i = 0; i < arguments.length; ++i) print('Arg ', i+1, ': ', arguments[i]); } func('a1', 'a2');");

ok..wherever the function is defines.. do i need to provide function body while evaluating then...or i can simply write

engine.evaluate("function func('a1', 'a2');");

[wysota]

or i can simply write

engine.evaluate("function func('a1', 'a2');");

You definitely can't write that because this code has a syntax error.

As I said the code works regardless where the function is defined.

#include <QScriptEngine>
#include <QCoreApplication>
 
int main(int argc, char **argv) {
  QCoreApplication app(argc, argv);
  QScriptEngine engine;
  engine.evaluate("function func() { for(var i = 0; i < arguments.length; ++i) print('Arg ',i+1,': ', arguments[i]); }"); // define here
  engine.evaluate("func('a1', 'a2');"); // call here
  return 0;
}

#include <QScriptEngine>
#include <QCoreApplication>

int main(int argc, char **argv) {
  QCoreApplication app(argc, argv);
  QScriptEngine engine;
  engine.evaluate("function func() { for(var i = 0; i < arguments.length; ++i) print('Arg ',i+1,': ', arguments[i]); }"); // define here
  engine.evaluate("func('a1', 'a2');"); // call here
  return 0;
}

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This also works (notice the parenthesis in function definition):

#include <QScriptEngine>
#include <QCoreApplication>
 
int main(int argc, char **argv) {
  QCoreApplication app(argc, argv);
  QScriptEngine engine;
  QScriptValue fun = engine.evaluate("(function func() { for(var i = 0; i < arguments.length; ++i) print('Arg ',i+1,': ', arguments[i]); })");
  fun.call(QScriptValue(), QScriptValueList() << "a1" << "a2");
  return 0;
}

#include <QScriptEngine>
#include <QCoreApplication>

int main(int argc, char **argv) {
  QCoreApplication app(argc, argv);
  QScriptEngine engine;
  QScriptValue fun = engine.evaluate("(function func() { for(var i = 0; i < arguments.length; ++i) print('Arg ',i+1,': ', arguments[i]); })");
  fun.call(QScriptValue(), QScriptValueList() << "a1" << "a2");
  return 0;
}

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