CODEWITHSUNDEEP
c++visual-studio-2012booleanvariant
tmighty
tmighty

Reputation: 11399

C++ short* to VARIANT_BOOL*

I have a function that expects a short* as an argument. I would need to convert this to a VARIANT_BOOL*. Can anybody tell me a reliable way to do this?

I can even pass the VARIANT_BOOL* to the function, but then the VARIANT_BOOL* is not filled with the correct value.

Thank you very much for the help!

STDMETHODIMP CWrapper::get_IsOpen(VARIANT_BOOL* uIsOpen, LONG* pVal)
{
    if (_c)
    {
        *pVal=_c->IsOpen(uIsOpen); //_c->IsOpen expects short* as argument
        return S_OK;
    }
    else
    {
        return S_FALSE;
    }
}

Upvotes: 0

Views: 235

Answers (2)

Joseph Mansfield
Joseph Mansfield

Reputation: 110728

VARIANT_BOOL is defined as:

typedef short VARIANT_BOOL;

So if you want to pass a VARIANT_BOOL to a function that takes a short*, you need to take its address using &. If you want turn the short that a short* points at into a VARIANT_BOOL, you need to perform indirection using *.

VARIANT_BOOL vb = VARIANT_TRUE;

short* sp = &vb; // VARIANT_BOOL to short*

VARIANT_BOOL vb2 = *sp; // short8 to VARIANT_BOOL

Upvotes: 3

XTF
XTF

Reputation: 1101

Put the VARIANT_BOOL in a short, call the function, put the short back into the VARIANT_BOOL.

Upvotes: 0

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