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Asked: 2026-05-25T18:02:02+00:00

I am trying to access (from a VB6 application) an unsigned 32 bit integer

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I am trying to access (from a VB6 application) an unsigned 32 bit integer data type returned by the method of a C++ COM object. The part of an interface is declared like:

...
interface ICOMCanvasPixelBuffer : IUnknown
{
    HRESULT GetWidth([retval][out] DWORD *pWidth);
    HRESULT GetHeight([retval][out] unsigned __int32 *pHeight);
    ...

When I am browsing this interface using the Object Browser in VB6, it shows Function GetWidth() As <Unsupported variant type> hint for both of these methods.

Is there way to pass the unsigned integer data type to VB6?

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1 Answer

  1. Editorial Team

    VB6 does not have unsigned datatypes. Is the COM object yours? Just change the interface to a regular, signed int. Do you really have images with width and height over 2 billion?

    If the COM object is not yours, sorry, its interface is not Automation-compliant. You can put together a proxy C++ object that would convert all the unsigned‘s to int‘s.

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