如何在MFC应用程序中使用MAPI32.DLL发送电子邮件。

/*加上头文件*/
#include
#include

/* 定义SendEmail函数的返回值*/
#define SENDEMAIL_SUCCESS               0 //邮件成功发送
#define SENDEMAIL_MAPI_NOT_INSTALLED    1 //没有安装MAPI Server
#define SENDEMAIL_MAPILOAD_FAILED       2 //加载 MAPI32.DLL 失败
#define SENDEMAIL_LOGON_FAILED          3 //无法登陆到 MAPI Server 或者 用户取消了登陆框
#define SENDEMAIL_SEND_FAILED           4 //消息发送失败

int SendEmail(const char* Address,

    const char* Subject,

    const char* Text)

{
    int             iResult;
    UINT            iMapiInstalled;
    HINSTANCE       hMAPIInst;
    LPMAPILOGON     pMAPILogon;
    LPMAPILOGOFF    pMAPILogoff;
    LPMAPISENDMAIL  pMAPISendMail;
    LHANDLE         lhSession;

    iResult         = SENDEMAIL_SUCCESS;

    iMapiInstalled  = GetProfileInt("Mail", "MAPI", 0);

    if(! iMapiInstalled)
        return SENDEMAIL_MAPI_NOT_INSTALLED;

     hMAPIInst       = LoadLibrary("MAPI32.DLL");
    if(!hMAPIInst)
        return SENDEMAIL_MAPILOAD_FAILED;

    pMAPILogon      = (LPMAPILOGON)
                       GetProcAddress(hMAPIInst, "MAPILogon");
    pMAPILogoff     = (LPMAPILOGOFF)
                       GetProcAddress(hMAPIInst, "MAPILogoff");
    pMAPISendMail   = (LPMAPISENDMAIL)
                       GetProcAddress(hMAPIInst, "MAPISendMail");

    if( pMAPILogon(0, NULL, NULL, MAPI_LOGON_UI, 0, &lhSession)
        != SUCCESS_SUCCESS)
    {
        iResult = SENDEMAIL_LOGON_FAILED;
    }
    else        /* Send the Message         */
    {
        ULONG       Result;
        MapiMessage Msg;

         MapiRecipDesc Recipients[1];
        Recipients[0].ulReserved = 0;
        Recipients[0].ulRecipClass = MAPI_TO;
        Recipients[0].lpszName = (char*)Address;
        Recipients[0].lpszAddress = (char*)Address;
        Recipients[0].ulEIDSize = 0;
        Recipients[0].lpEntryID = 0;

        memset(&Msg, 0, sizeof(Msg));
        Msg.lpszSubject         = (char*)Subject;
        Msg.lpszNoteText        = (char*)Text;
        Msg.nRecipCount         = 1;
         Msg.lpRecips            = Recipients;

        Result      = pMAPISendMail(lhSession, 0, &Msg, 0, 0);
        if(Result != SUCCESS_SUCCESS)
            iResult = SENDEMAIL_SEND_FAILED;

         pMAPILogoff(lhSession, 0, 0, 0);
    }

     FreeLibrary(hMAPIInst);

    return iResult;
}

调用方法：
rc = SendEmail("SMTP:[email protected]", "一个小测试","你好，\n其实这很简单。");