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Returning a value from a method in an ActiveX control

I am creating an ActiveX control that will be used in web pages to query the currently installed version of third party software on a client machine. Only one method, GetVersion, should be presented to the control, which returns the version as an integer. I am very inexperienced with ActiveX and am having trouble with something as simple as returning values ​​from methods correctly. If I use the following declaration in IDL:

[id(1)] void GetVersion();

Connects to the following implementation:

BEGIN_DISPATCH_MAP(CDetectorCtrl, COleControl)
    DISP_FUNCTION_ID(CDetectorCtrl, "GetVersion", 1, GetVersion, VT_EMPTY, VTS_NONE)
END_DISPATCH_MAP()

void CDetectorCtrl::GetVersion()
{
    MessageBox(L"Test");
}

I can call a method from HTML and see my MessageBox fine.

But if I change the definition / code to:

[id(1)] int GetVersion();

and

BEGIN_DISPATCH_MAP(CDetectorCtrl, COleControl)
    DISP_FUNCTION_ID(CDetectorCtrl, "GetVersion", 1, GetVersion, VT_INT, VTS_NONE)
END_DISPATCH_MAP()

int CDetectorCtrl::GetVersion()
{
    MessageBox(L"Test");
    return 1337;
}

I am getting a crash when calling a method from HTML.

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1 answer


Answered a question and answered ...

The problem seemed to be missing AFX_MANAGE_STATE in the method itself:



LONG CDetectorCtrl::GetVersion(void)
{
    AFX_MANAGE_STATE(AfxGetStaticModuleState());
    return 1337;
}
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