aidsub.cpp

一个OPC客户端监视程序

//**************************************************************************
//
// VariantToString() convert the value to String format
//
//**************************************************************************
#include "stdafx.h"
#include "OpcClientSpy.h"

void VariantToString(VARIANT value, CString& strText)
{
    strText.Empty();
    switch(value.vt)
    {
        case VT_BOOL:
            strText = value.boolVal ? _T("On") : _T("Off");
            break;
        case VT_UI1:
            strText.Format( _T("%hd"), (USHORT)value.bVal );
            break;
        case VT_UI2:
        case VT_I2:
            strText.Format( _T("%hd"), value.iVal );
            break;
        case VT_I4:
            strText.Format( _T("%d"), value.lVal );
            break;
        case VT_R4:
            strText.Format( _T("%g"), value.fltVal );
            break;
        case VT_R8:
            strText.Format( _T("%g"), value.dblVal );
            break;
        case VT_BSTR:
            strText = value.bstrVal;
            break;
        default: // Arrays of simple types
        {
            if( (value.vt & VT_ARRAY)==VT_ARRAY )
            {
                CString temp;
                SAFEARRAY* pArray = value.parray;
                LONG lBound = 0, uBound = 0;
                SafeArrayGetLBound( pArray, 1, &lBound );
                SafeArrayGetUBound( pArray, 1, &uBound );
                for( long element=lBound; element<=uBound; element++ )
                {
                    if( strText.IsEmpty() )
                        strText.Format( _T("(%d) "), uBound-lBound+1);
                    else
                        strText += _T(", ");
                    switch( value.vt & ~VT_ARRAY )
                    {
                    case VT_BOOL:
                        {
                            VARIANT_BOOL b=0;
                            SafeArrayGetElement(pArray, &element, &b);
                            temp = b ? _T("1") : _T("0");
                        }
                        break;
                    case VT_UI1:
                        {
                            BYTE b=0;
                            SafeArrayGetElement(pArray, &element, &b);
                            temp.Format( _T("%hd"), b );
                        }
                        break;
                    case VT_UI2:
                    case VT_I2:
                        {
                            short b=0;
                            SafeArrayGetElement(pArray, &element, &b);
                            temp.Format( _T("%hd"), b );
                        }
                        break;
                    case VT_I4:
                        {
                            long b=0;
                            SafeArrayGetElement(pArray, &element, &b);
                            temp.Format( _T("%d"), b );
                        }
                        break;
                    case VT_R4:
                        {
                            float d=0;
                            SafeArrayGetElement(pArray, &element, &d);
                            temp.Format( _T("%g"), d );
                        }
                        break;
                    case VT_R8:
                        {
                            double d=0;
                            SafeArrayGetElement(pArray, &element, &d);
                            temp.Format( _T("%g"), d );
                        }
                        break;
                    case VT_BSTR:
                        {
                            BSTR b;
                            SafeArrayGetElement(pArray, &element, &b);
                            temp = b;
                        }
                        break;
                    }
                    strText += temp;
                }
            }
            else
                strText = _T("?");
        }
    }
}