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How to specify a function that takes a void* in C   OCX module?
afx_msg void Test(void const* pSrc);

BEGIN_DISPATCH_MAP(COcxTestCtrl, COleControl)
    DISP_FUNCTION_ID(COcxTestCtrl, "Test", 1, Test, VT_EMPTY, VTS_PI1 /*??*/)
END_DISPATCH_MAP()

dispinterface _DOcxTest {
    properties:
    methods:     [id(1)] void Test(void const* pSrc);
};

Sub Test(pSrc As Any)
Member of OcxTestLib.OcxTest

Private Sub TestButton_Click()
    Dim text() As Byte
    Dim buflen As Long
    buflen = 2 ^ 16
    text = String(buflen, "Z")
    OcxTest1.Test (text(0))
End Sub