MSScriptControl AddObject Problem

Question

4.00/5 (1 vote)

See more:

Hi,

I'm wanting to use the MSScriptControl from C++ (Visual Studio 2012). When I call the AddObject in runtime I get a "Specified Cast Is Invalid" error.

I have this is my AssemblyInfo.cpp:

C++

[assembly:ComVisible(true)];

This is my BasicCommands.h:

C++

namespace BasicCommands
{
	ref class BasicCommandsClass
	{
		//speak a phrase
	public:
		void SpeakPhrase(String^ phrase)
		{
			SpeechSynthesis::SpeakPhrase(phrase);
		}
		
	

		void RunScript(String^ script)
		{
			MSScriptControl::ScriptControlClass^ pScriptControl=gcnew MSScriptControl::ScriptControlClass();
			pScriptControl->Language = "vbscript";
			pScriptControl->AllowUI = true;
			pScriptControl->AddObject("MyCommands",this,true);
			pScriptControl->ExecuteStatement(script);
		}
	};
}

The AddObject should be adding the SpeakPhrase command so I can call it from my vbscript.

Any idea why it's not working?

Cheers,
Mike.

Posted 7-Oct-12 4:45am

Mike Hodgson

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Daniele Rota Nodari · Answer 1 · 2012-10-07T21:11:00

Solution 1

Hi.

Try add [ComVisibleAttribute(true)] to the class BasicCommandsClass.

MSScriptControl uses COM technology to access to the object properties and methods, so if the class is not COM visible, it cannot be used by any script.

Regards,
Daniele.

Posted 7-Oct-12 21:11pm

Daniele Rota Nodari

Comments

Mike Hodgson 8-Oct-12 4:12am

Thanks Daniele, I tried that out putting it above the class, it compiled as normal but I'm still getting the 'Specified Cast Is Not Valid'. I tested in vb.net and it worked fine, so not sure what's up with C++.

Cheers,
Mike.