How to get value from Script file?

[superinman]

Hi.

I have a problem about Qtscript.

My project is a com port tool and my idea is: The main project loads a script file and returns commands to the C++ code, then the commands from script file are sent to the peripheral equipment. In this way I just need to change the script file if I want to send different commands each time.

Now I did in this way:
this is the C++ code to interpret script file:

QScriptEngine engine; 
QString scriptFileName(":/myscriptfile.js");// Change the script file according to the requirement. 
QFile file(scriptFileName); 
file.open(QIODevice::ReadOnly); 
engine.evaluate(file.readAll(), scriptFileName); 
file.close(); 
QScriptValue global = engine.globalObject(); 
QScriptValue GeneralCommand = global.property("myCommand"); 
QScriptValue ATCommand1 = global.property("Command1"); 
QScriptValue ATCommand2 = global.property("Command2"); 
QScriptValue ATCommand3 = global.property("Command3"); 
QScriptValue ATCommand4 = global.property("Command4"); 
QScriptValue ATCommand5 = global.property("Command5"); 
 
CommandString[0]=GeneralCommand.call(ATCommand1).toString(); 
CommandString[1]=GeneralCommand.call(ATCommand2).toString(); 
CommandString[2]=GeneralCommand.call(ATCommand3).toString(); 
CommandString[3]=GeneralCommand.call(ATCommand4).toString(); 
CommandString[4]=GeneralCommand.call(ATCommand5).toString();

QScriptEngine engine; 
QString scriptFileName(":/myscriptfile.js");// Change the script file according to the requirement. 
QFile file(scriptFileName); 
file.open(QIODevice::ReadOnly); 
engine.evaluate(file.readAll(), scriptFileName); 
file.close(); 
QScriptValue global = engine.globalObject(); 
QScriptValue GeneralCommand = global.property("myCommand"); 
QScriptValue ATCommand1 = global.property("Command1"); 
QScriptValue ATCommand2 = global.property("Command2"); 
QScriptValue ATCommand3 = global.property("Command3"); 
QScriptValue ATCommand4 = global.property("Command4"); 
QScriptValue ATCommand5 = global.property("Command5"); 

CommandString[0]=GeneralCommand.call(ATCommand1).toString(); 
CommandString[1]=GeneralCommand.call(ATCommand2).toString(); 
CommandString[2]=GeneralCommand.call(ATCommand3).toString(); 
CommandString[3]=GeneralCommand.call(ATCommand4).toString(); 
CommandString[4]=GeneralCommand.call(ATCommand5).toString();

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this is the script file"myscriptfile.js":

//! [0] 
function myCommand() { return this.Command;} 
Command1 = { Command: 'test command 1'} 
Command2 = { Command: ' test command 2'} 
Command3 = { Command: ' test command 3} 
Command4 = { Command: ' test command 4'} 
Command5 = { Command: ' test command 5'}
//! [0]

//! [0] 
function myCommand() { return this.Command;} 
Command1 = { Command: 'test command 1'} 
Command2 = { Command: ' test command 2'} 
Command3 = { Command: ' test command 3} 
Command4 = { Command: ' test command 4'} 
Command5 = { Command: ' test command 5'}
//! [0]

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Actually it works. However I want to do it in a better way. the script file can be like this:

SendCommand('test command 1'); 
SendCommand('test command 2'); 
SendCommand('test command 3'); 
SendCommand('test command 4');

SendCommand('test command 1'); 
SendCommand('test command 2'); 
SendCommand('test command 3'); 
SendCommand('test command 4');

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It is simple and easy to understand. But I don't know how to configure script engine in order to write script code like this? Is there someone can tell me how to do? thanks a lot.

[asvil]

First way, declare array object in script environment:
C++

QString scriptFileName(":/myscriptfile.js");// Change the script file according to the requirement. 
QFile file(scriptFileName); 
file.open(QIODevice::ReadOnly); 
QScriptValue jsArray = engine.evaluate(file.readAll(), scriptFileName); 
file.close(); 
QStringList commands = jsArray.toVariant().toStringList();
// if function work with array
// sendArrayToPort(commands);
// else
// foreach(QString command, commands)
//   sendToPort(command);

QString scriptFileName(":/myscriptfile.js");// Change the script file according to the requirement. 
QFile file(scriptFileName); 
file.open(QIODevice::ReadOnly); 
QScriptValue jsArray = engine.evaluate(file.readAll(), scriptFileName); 
file.close(); 
QStringList commands = jsArray.toVariant().toStringList();
// if function work with array
// sendArrayToPort(commands);
// else
// foreach(QString command, commands)
//   sendToPort(command);

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JS

["command1", "command2", "command3",...,"commandN"]

["command1", "command2", "command3",...,"commandN"]

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Second way, wrapping a native function:
C++

QScriptValue sendToPortWrapper(QScriptContext *context, QScriptEngine* engine)
{
  if (context->argumentCount()) {
    sendToPort(context->argument(0).toString());
  }
  return engine->undefinedValue();
}
 
 
{
............
engine->globalObject().setProperty("sendToPort", engine->newFunction(sendToPortWrapper));
............
}

QScriptValue sendToPortWrapper(QScriptContext *context, QScriptEngine* engine)
{
  if (context->argumentCount()) {
    sendToPort(context->argument(0).toString());
  }
  return engine->undefinedValue();
}


{
............
engine->globalObject().setProperty("sendToPort", engine->newFunction(sendToPortWrapper));
............
}

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JS

sendToPort('command1');
sendToPort('command2');
sendToPort('command3');
sendToPort('command4');

sendToPort('command1');
sendToPort('command2');
sendToPort('command3');
sendToPort('command4');

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[superinman]

Thank you very much!!