WICPixelFormatGUID = {????????-????-????-????-????????????} gives on debugging

Question

I am trying to display on a button click. i have written a code and i am sure it is correct.

On debuging i get the value of WICPixelFormatGUID = {????????-????-????-????-????????????} and guidPixelFormatSource = {CCCCCCCC-CCCC-CCCC-CCCC-CCCCCCCCCCCC}. I don't know why i get these strange values??

My code is as follows-

   HRESULT AMEPreviewHandler::ConvertBitmapSourceTo32bppHBITMAP(
        IWICBitmapSource * pBitmapSource, 
        IWICImagingFactory * pImagingFactory, 
        HBITMAP * pStream)
//Pay Attention that this function is called from a static function by creating instance of the class (there is no problem in the function call . I have checked the value of the parameters while debugging   and i am sure that its correct)
    {
        IWICBitmapSource *pBitmapSourceConverted = NULL;
        WICPixelFormatGUID guidPixelFormatSource; /the problem here is here on debugging it gives strange value.
        HRESULT hr = pBitmapSource->GetPixelFormat(&guidPixelFormatSource);
        if (SUCCEEDED(hr) && (guidPixelFormatSource != GUID_WICPixelFormat32bppBGRA))
        {
            IWICFormatConverter *pFormatConverter;
            hr = pImagingFactory->CreateFormatConverter(&pFormatConverter);
            if (SUCCEEDED(hr))
            {
                             .......And so on....
            }
        }
    }

One more thing is when i run the same code from non-static function it works fine(but my situation is i have to call it on button click event and it is done by DialogProc()function (and it is static function) and i have no more option left so i created the instance of the class and using those instance and pointer i am calling this ConvertBitmapSourceTo32bppHBITMAP(by passing the parameter using instances which are intialized in contructor).

Any reasons for the strange value on debugging of the two ???