how to call a function of a object in jscript usr vc++

Question

hi ,all,my english is not very good ,i hope i can descript my question clearly.

recently ,i  m writing a project need to call some javascript function in my c++ project,i use the IScriptControl interface,and i solve the simple call of the javascript function,for example there is a function in my test.js:

function test(){return "hello world";}

in my project code like that :

                CoInitialize(NULL);
	
		HRESULT hr = m_Script.CreateInstance(__uuidof(ScriptControl));
		if (FAILED(hr))
			return FALSE;
		m_Script->PutLanguage(L"JScript");
		m_Script->PutAllowUI(VARIANT_TRUE);
	
		m_Script->AddCode(_T("function test(){return \"hello world\"}"));
		//..........

		IScriptProcedureCollectionPtr m_collection = m_Script->GetProcedures();
		LONG u = m_collection->GetCount();
		IScriptProcedurePtr m_procedure = m_collection->GetItem(_variant_t(1));
		_bstr_t funname = m_procedure->GetName();

		m_Script->Run(//.....);

this just a test ,that code can call the normal jscript function ,but if there is an object in a js file ,like:

var TestObj = {};

TestObj.func = function()
{
      return "hello world";
}

now ,i dont know how to call this function. i search on google,and know i maybe need a IDispatch Object,because the IScriptControl::AddObject(),need a IDisPatch pointer be parameter,i dont know how to create that object to reference the object in my js file ,if u know that ,pls tell me ,thank you very much 

Answer 1

Where do the jscript reside at?  I did some with jscript before, but it must run inside IE control.

Steve

Answer 2

Zhou,

Your second code snippet defines a function and adds that function as a property to your TestObj object.  There is nothing in there that calls a function.  If you need to invoke it, you can call TestObj.func().

You can pass your TestObj object into your C++ code.  However, to do that, you will need to either define an external function for the container, or call an object that itself takes an object.  I find the second method easier, since I don't always need or want to set up and configure the container. 

To follow that method, you will need some JScript code along these lines:

function GetObject(caller)
{
   caller.SetObject(TestObj);
}

where TestObj is your object from above.  The 'caller' parameter is your IDispatch*, pointing to a valid ActiveX object (meaning it needs to have a configured type library).  If you already know COM, the specifics of how to pass an object is fairly well documented in the Microsoft JScript engine documentation.  If not, I suggest you at least take a crash course.