如何通过IMessage获得相关信息？[

Question

我获取的是草稿箱的邮件，pMsg是邮件对象       
        ULONG cValuesMail = 0;
SPropValue *pspvEmail;
SizedSPropTagArray(1, sptaEmail) = { 1, PR_SENDER_EMAIL_ADDRESS};
pMsg->GetProps((SPropTagArray *) &sptaEmail, MAPI_UNICODE, &cValues,
&pspvEmail);
if (pspvEmail->ulPropTag == PR_SENDER_EMAIL_ADDRESS )
wcout < <"  " < < pspvEmail->Value.lpszW < < endl;

ULONG cValuesBody = 0;
SPropValue *pspvBody;
SizedSPropTagArray(1, sptaEmail) = { 1, PR_BODY };
pMsg->GetProps((SPropTagArray *) &sptaEmail, MAPI_UNICODE, &cValues,
&pspvBody);
if (pspvBody->ulPropTag == PR_BODY )
wcout < <"  " < < pspvBody->Value.lpszW < < endl;
总是判断不成立，pspvBody->ulPropTag值是10，不知道为什么。请大家帮忙，谢谢