Getting coledispatchexception at memory location 0x00b3d59c.

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I am getting exception in Open Method.

lpDisp = xlBooks.Open(a_sFileName,covOptional,covOptional,
    covOptional,covOptional,covOptional,covOptional,
    covOptional,covOptional,covOptional,covOptional,
    covOptional,covOptional,covOptional,covOptional);

LPDISPATCH Workbooks::Open(LPCTSTR Filename, const VARIANT& UpdateLinks, const VARIANT& ReadOnly, const VARIANT& Format, const VARIANT& Password, const VARIANT& WriteResPassword, const VARIANT& IgnoreReadOnlyRecommended, const VARIANT& Origin, 
		const VARIANT& Delimiter, const VARIANT& Editable, const VARIANT& Notify, const VARIANT& Converter, const VARIANT& AddToMru, const VARIANT& Local, const VARIANT& CorruptLoad)
{
	LPDISPATCH result;
	static BYTE parms[] =
		VTS_BSTR VTS_VARIANT VTS_VARIANT VTS_VARIANT VTS_VARIANT VTS_VARIANT VTS_VARIANT VTS_VARIANT VTS_VARIANT VTS_VARIANT VTS_VARIANT VTS_VARIANT VTS_VARIANT VTS_VARIANT VTS_VARIANT;
	InvokeHelper(0x783, DISPATCH_METHOD, VT_DISPATCH, (void*)&result, parms,
		Filename, &UpdateLinks, &ReadOnly, &Format, &Password, &WriteResPassword, &IgnoreReadOnlyRecommended, &Origin, &Delimiter, &Editable, &Notify, &Converter, &AddToMru, &Local, &CorruptLoad);
	return result;
}

What I have tried:

It seems

excel interop

issue.

Posted 31-Mar-20 3:53am

Member 13261094

Updated 31-Mar-20 5:38am

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Comments

Richard MacCutchan 31-Mar-20 10:25am

It could be anything. You need to use your debugger to check all the parameters in the Open call.

Stefan_Lang 31-Mar-20 10:57am

Ahh, the mighty VARIANT ... it's been ages I last had to use these, and I'm happy these days are past.

You have my condolences.

Greg Utas 31-Mar-20 13:24pm

I've never used it. I looked at it and closed my browser page while retching.

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KarstenK · Answer 1 · 2020-03-31T05:39:00

This is the clear sign that you have not properly prepared your open function. My best guess is that these parameters arent so optional, but are mandatory in some scenarios. You must not only initialize a variant with some proper value but also with the type.

bonus tip: open in read-only mode and try a text file