求教从variant类型到cstring类型的转换方法

[huhu_ccz]

rt
3ks

[seesi]

char *c;
CString str;
long lVal;
switch(value.vt)
{
case VT_BSTR:
c = (char *)_com_util::ConvertBSTRToString( V_BSTR(&value) );
str=c;
break;
case VT_I4:
case VT_DECIMAL:
case VT_UI4:
case VT_I8:
case VT_UI8:
case VT_INT:
case VT_UINT:
lVal = long(value);
ltoa(lVal,cVal,10);
str.Fomate("%d",lVal);
break;
case VT_DATE:
dt=value.date;
da=COleDateTime(dt);
//str=da.Format("%Y-%m-%d %H:%M:%S");
str=da.Format("%Y-%m-%d ");
break;
//其他一样道理
default:
break;
}