IShellIconOverlayIdentifier::GetOverlayInfo implementation Explorer.exe crashing

I have created a shell IconOverlayBaseImpl class which created an entry in the registry

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers

I have implemented  IShellIconOverlayIdentifier::GetOverlayInfo method as  a wrapper class
Wrapper:::GetOverlayInfo(LPWSTR pwszIconFile, int cchMax, int* pIndex, DWORD* pdwFlags)
{

*pdwFlags = ISIOI_ICONFILE | ISIOI_ICONINDEX;
*pIndex = 0; 
*pdwFlags = ISIOI_ICONFILE | ISIOI_ICONINDEX;
 wcsncpy_s(L"C:\\Users\\guest\\Desktop\\File\\Fox", 31, L"C:\\Test\\alert.ico, 31); 
return S_OK;

}

Wrapper::IsMemberOf(LPCWSTR pwszPath, DWORD dwAttrib )
{

	if(Obj.getVal("C:\\Users\\guest\\Desktop\\File\\Fox") //Bool
	{
		return S_OK;

	}

}


//IconOverlayBase::GetOverlayInfo will call shell Wrapper:GetOverlayInfo method.


IconOverlayBaseImpl::IsMemberOf(LPCWSTR pwszPath, DWORD dwAttrib )
{

          Hresult hr = Wrapper.IsMemberOf(pwszPath, dwAttrib);
        if(SUCCEEDED(hr) && hr == S_OK)
	{
          Wrapper:::GetOverlayInfo()
		
	}


}

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But Explorer.exe is crashing  at   wcsncpy_s(L"C:\\Users\\guest\\Desktop\\File\\Fox", 31, L"C:\\Test\\alert.ico, 31);
HPFE455Asked:
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jkrCommented:
Um, in the line

 wcsncpy_s(L"C:\\Users\\guest\\Desktop\\File\\Fox", 31, L"C:\\Test\\alert.ico, 31);

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the fist parameter should be the target buffer, *not* a string literal, which causes the crash - did you mean

 wcsncpy_s(pwszIconFile, 31, L"C:\\Test\\alert.ico, 31);

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?
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jkrCommented:
Ooops, sorry, that should be

 wcsncpy_s(pwszIconFile, cchMax, L"C:\\Test\\alert.ico, 31);

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HPFE455Author Commented:
I was using wrognly, later I found.  thanks jkr
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