Automating Mathcad

I need to control loading a mathcad file into mathcad, via a c++ interace. Attached is the code. I have MathCad 15 on the system. The line where I try to Open the MCD file throws an AV exception. Can anyone point me in the right direction on how to correct this?

Thanks, Brian
IMathcadApplication* McApp;
	IMathcadWorksheets* McWorksheets;
	IMathcadWorksheet* McWorksheet;
	CoInitialize(NULL);    // Initialize the COM library
	HRESULT hr=CoCreateInstance(CLSID_App, NULL,
	if (!SUCCEEDED(hr)) {
		MessageDlg("Unable to create a MathCad Application object",mtError, TMsgDlgButtons() << mbOK, 0);
		return ;
	wchar_t m_wszbuffer[50];
	mbstowcs(m_wszbuffer, "", 50);

Open in new window

Brian DumasSenior Software EngineerAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Anjeneya MurthySr. ConsultantCommented:
As a first step Did you ensure
- McWorksheets is valid?
- m_wszbuffer is valid? Properly null terminated string?

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.