mirror of https://github.com/tongzx/nt5src
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
67 lines
2.0 KiB
67 lines
2.0 KiB
/*--------------------------------------------------------------------------*
|
|
*
|
|
* Microsoft Windows
|
|
* Copyright (C) Microsoft Corporation, 1992 - 1999
|
|
*
|
|
* File: variant.h
|
|
*
|
|
* Contents: Interface file for various VARIANT helper functions
|
|
*
|
|
* History: 19-Nov-1999 jeffro Created
|
|
*
|
|
*--------------------------------------------------------------------------*/
|
|
|
|
#pragma once
|
|
#ifndef VARIANT_H_INCLUDED
|
|
#define VARIANT_H_INCLUDED
|
|
|
|
|
|
/*+-------------------------------------------------------------------------*
|
|
* ConvertByRefVariantToByValue
|
|
*
|
|
* VBScript will has two syntaxes for calling dispinterfaces:
|
|
*
|
|
* 1. obj.Method (arg)
|
|
* 2. obj.Method arg
|
|
*
|
|
* The first syntax will pass arg by value, which out dispinterfaces will
|
|
* be able to handle. If Method takes a BSTR argument, the VARIANT that
|
|
* arrives at Method will be of type VT_BSTR.
|
|
*
|
|
* The second syntax will pass arg by reference. In this case Method will
|
|
* receive a VARIANT of type (VT_VARIANT | VT_BYREF). The VARIANT that is
|
|
* referenced will be of type VT_BSTR.
|
|
*
|
|
* This function will dereference the VARIANT and return the direct pointer
|
|
* in pVar. Calling this function on a VARIANT that is not VT_BYREF is
|
|
* harmless.
|
|
*--------------------------------------------------------------------------*/
|
|
|
|
inline VARIANT* ConvertByRefVariantToByValue (VARIANT* pVar)
|
|
{
|
|
while ((pVar != NULL) && (V_VT(pVar) == (VT_VARIANT | VT_BYREF)))
|
|
{
|
|
pVar = V_VARIANTREF(pVar);
|
|
}
|
|
|
|
return (pVar);
|
|
}
|
|
|
|
|
|
/*+-------------------------------------------------------------------------*
|
|
* IsOptionalParamMissing
|
|
*
|
|
* Returns true if an optional argument to an Automation method is left
|
|
* blank. This is indicated by a type of VT_ERROR with a value of
|
|
* DISP_E_PARAMNOTFOUND.
|
|
*
|
|
* This should be moved to a header.
|
|
*--------------------------------------------------------------------------*/
|
|
|
|
inline bool IsOptionalParamMissing (const VARIANT& var)
|
|
{
|
|
return ((V_VT(&var) == VT_ERROR) && (V_ERROR(&var) == DISP_E_PARAMNOTFOUND));
|
|
}
|
|
|
|
|
|
#endif /* VARIANT_H_INCLUDED */
|