_variant_t是VARIANT的封裝類，其賦值可以使用強制類型轉(zhuǎn)換，其構(gòu)造函數(shù)會自動處理這些數(shù)據(jù)類型。使用時需加上#include

_variant_t轉(zhuǎn)化為CString

variant_t v;
CString str = v.bstrVal;

CString轉(zhuǎn)化為_variant_t

可用 COleVariant 代替.
COleVariant v;
CString str = "this is test";
v = str;
也可轉(zhuǎn)換為VARIANT
VARIANT v1 = v;

#include "atlbase.h"

CComBSTR outbstr;
VARIANT vtYouValueName,vtTemp;
outbstr.Append (szYourCString);
vtTemp.vt = VT_BSTR;
vtTemp.bstrVal=outbstr.Copy();
vtYouValueName = vtTemp ;