本来想继续谈谈AdviseSink，但是近来有些朋友问到关于收件人的问题，所以顺便先提一下这块。
发件人和收件人是邮件和消息很常用的几个属性之一，关于发件人的设置和获取是很简单的，只需要处理PR_SENDER_EMAIL_ADDRESS属性即可，下面主要讲述的收件人的设置和获取。
MAPI收件人结构如图（摘自MSDN）:
每一个Entry代表了一个收件人信息组，每个信息组又可以有多项信息组成，举个例子，下面的代码代表了一个收件人的信息：
aEntries[0].rgPropVals[0].ulPropTag = PR_RECIPIENT_TYPE; //类型，MAPI_TO代表是设置到TO字段上的，相应的还有MAPI_CC和MAPI_BCC。
aEntries[0].rgPropVals[0].Value.ul = MAPI_TO;
aEntries[0].rgPropVals[1].ulPropTag = PR_ADDRTYPE; //设置地址类型，一般为SMTP
aEntries[0].rgPropVals[1].Value.LPSZ = _T("SMTP");
aEntries[0].rgPropVals[2].ulPropTag = PR_EMAIL_ADDRESS; //收件人地址
aEntries[0].rgPropVals[2].Value.LPSZ = _T("1234567");
设置收件人是通过IMessage:: ModifyRecipients来实现的，以下的代码举例说明了如何设置TO、CC和BCC属性：
INT nRecipientCount = 3; //表示有10个联系人信息
INT nListBufSize = CbNewADRLIST(nRecipientCount); //计算10个联系人需要的存储空间
LPADRLIST pAddressList = NULL;
MAPIAllocateBuffer(nListBufSize, (LPVOID FAR *)&pAddressList)); //分配空间
memset(pAddressList, 0, nBufSize);
pAddressList->cEntries = 3; //表明一共有3个联系人信息
//设置To
INT nCurIndex = 0;
MAPIAllocateBuffer(sizeof(SPropValue) * 3, (LPVOID FAR *)&pAddressList->aEntries[nCurIndex].rgPropVals)); //分配空间 memset(pAddressList->aEntries[nCurIndex].rgPropVals, 0, sizeof(SPropValue) * 3);
pAddressList->aEntries[nCurIndex].rgPropVals[0].ulPropTag = PR_RECIPIENT_TYPE;
pAddressList->aEntries[nCurIndex].rgPropVals[0].Value.ul = MAPI_TO; //表明是写到To
pAddressList->aEntries[nCurIndex].rgPropVals[1].ulPropTag = PR_ADDRTYPE;
pAddressList->aEntries[nCurIndex].rgPropVals[1].Value.LPSZ = _T("SMTP");
pAddressList->aEntries[nCurIndex].rgPropVals[2].ulPropTag = PR_EMAIL_ADDRESS;
pAddressList->aEntries[nCurIndex].rgPropVals[2].Value.LPSZ = _T("1234567");
pAddressList->aEntries[nCurIndex].cValues = 3; //表明改联系人有3个属性要设置
//同上，现在设置CC
nCurIndex = 1;
MAPIAllocateBuffer(sizeof(SPropValue) * 3, (LPVOID FAR *)&pAddressList->aEntries[nCurIndex].rgPropVals)); //分配空间 memset(pAddressList->aEntries[nCurIndex].rgPropVals, 0, sizeof(SPropValue) * 3);
pAddressList->aEntries[nCurIndex].rgPropVals[0].ulPropTag = PR_RECIPIENT_TYPE;
pAddressList->aEntries[nCurIndex].rgPropVals[0].Value.ul = MAPI_CC; //表明是写到CC
pAddressList->aEntries[nCurIndex].rgPropVals[1].ulPropTag = PR_ADDRTYPE;
pAddressList->aEntries[nCurIndex].rgPropVals[1].Value.LPSZ = _T("SMTP");
pAddressList->aEntries[nCurIndex].rgPropVals[2].ulPropTag = PR_EMAIL_ADDRESS;
pAddressList->aEntries[nCurIndex].rgPropVals[2].Value.LPSZ = _T("7654321");
pAddressList->aEntries[nCurIndex].cValues = 3; //表明改联系人有3个属性要设置
//同上，现在设置BCC
nCurIndex = 2;
MAPIAllocateBuffer(sizeof(SPropValue) * 3, (LPVOID FAR *)&pAddressList->aEntries[nCurIndex].rgPropVals)); //分配空间 memset(pAddressList->aEntries[nCurIndex].rgPropVals, 0, sizeof(SPropValue) * 3);
pAddressList->aEntries[nCurIndex].rgPropVals[0].ulPropTag = PR_RECIPIENT_TYPE;
pAddressList->aEntries[nCurIndex].rgPropVals[0].Value.ul = MAPI_BCC; //表明是写到CC
pAddressList->aEntries[nCurIndex].rgPropVals[1].ulPropTag = PR_ADDRTYPE;
pAddressList->aEntries[nCurIndex].rgPropVals[1].Value.LPSZ = _T("SMTP");
pAddressList->aEntries[nCurIndex].rgPropVals[2].ulPropTag = PR_EMAIL_ADDRESS;
pAddressList->aEntries[nCurIndex].rgPropVals[2].Value.LPSZ = _T("88888888");
pAddressList->aEntries[nCurIndex].cValues = 3; //表明改联系人有3个属性要设置
//调用ModifyRecipients添加联系人，完了记的释放申请的内存，pMsg为你想操作的Message的对象实例，关于如何获取可以参考以前的文章。 pMsg->ModifyRecipients(MODRECIP_ADD, pAddressList)
for(INT i = 0; i < nRecipientCount; i++)
MAPIFreeBuffer(pAddressList->aEntries[i].rgPropVals);
MAPIFreeBuffer(pAddressList);
OK，先讲完设置，以后有空将会继续讲解如何获取收件人信息。
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