在C++中发送电子邮件的代码

Question

大家好，

我知道有像jwsmtp和vmime或poco这样的外部库可以帮助你用c++发送电子邮件。然而，我在配置和链接它们时遇到了问题。因此，我想知道是否有人有通过我的gmail帐户在c++(Windows7os)中发送电子邮件的源代码。

Answer 1

如果你真的想用一种很难的方式来做这件事，你必须使用一个TLS库，比如OpenSSL或者Windows Schannel API来建立一个与服务器的TLS连接。如何做到这一点的一个例子可以在这里找到：http://www.coastrd.com/c-schannel-smtp

然而，我认为让这些外部库工作起来会容易得多。

Answer 2

我总是幸运地与Poco一起构建。唯一的诀窍是，首先您必须构建OpenSSL并将Poco构建脚本更改为其位置。

Answer 3

如果这对任何人都有用，下面是一些C++代码，它们在Microsoft Windows上基本上形成了一个带有附件、主题和正文文本EMail消息。它启动默认的EMail (MAPI)客户端，添加了附件并填充了其他属性。遗憾的是，它并不直接与SMTP服务器交互。我在我们的产品中使用它来让用户向我发送调试跟踪等等。

如果你想使用下面的代码，你需要替换ptiString和ptiStringArray，它们是管理字符串和字符串数组的内部类。TObjList只是一个类容器管理模板。给出了一个is all数组。

希望这能帮到你。

the .h

//---------------------------------------------------------------------------
// Only for Microsoft Windows
// uses Mapi32.dll
// uses MAPI to launch the EMail client, add attachments and message body
// to whatever client is in use.  It doesn't seem to work with Windows Live Mail
// see this link:   http://msdn.microsoft.com/en-us/library/windows/desktop/dd296721(v=vs.85).aspx
// and be aware of UAC crap-o-la:
// http://social.msdn.microsoft.com/Forums/office/en-US/63e9f5b2-f5f2-4cf8-bdc2-ca1fad88ebe5/problem-with-outlook-and-mapisendmail-returns-mapiefailure-when-outlook-is-running
//

#ifndef emailsenderH
#define emailsenderH

#include <windows.h>
#include <mapi.h>
#include "ptiString/ptiStringArray.h"
#include "ptiString/TObjList.h"

//---------------------------------------------------------------------------

class EMailSender
{
private:

    HWND m_hLib;

    ptiString Subject;
    ptiStringArray Body;
    TObjList<MapiFileDesc> Attachments;

    // don't copy this.
    EMailSender(const EMailSender &rhs);
    EMailSender &operator =(const EMailSender &rhs);

public:

    EMailSender();
    ~EMailSender();
    void AddAttachment(ptiString &filename);
    void AddAttachments(ptiStringArray &filename);
    void SetMessage(const ptiStringArray &);
    void SetMessage(const wchar_t *);
    void SetSubject(const ptiString &subj);
    void SetSubject(const wchar_t *subj);
    bool isEMailSupported();
    bool Send(HWND hWndParent);

};



#endif

the .cpp

#include "emailsender.h"


//---------------------------------------------------------------------------
EMailSender::EMailSender():m_hLib(0)
{
    m_hLib = LoadLibrary( "mapi32.dll" );
}

EMailSender::~EMailSender()
{
    if(m_hLib)
        FreeLibrary(m_hLib);
}

bool EMailSender::isEMailSupported()
{
    if(m_hLib)
        return(true);

    return(false);
}

void EMailSender::AddAttachment(ptiString &filename)
{
    MapiFileDesc *pFile = Attachments.Add();
    ZeroMemory( pFile, sizeof(MapiFileDesc) );
    pFile->nPosition = (unsigned long)-1;
    char *fname = const_cast<char *>( filename.toUTF8() );

    // convert filename to full path filename
    long length = MAX_PATH;

    char *Buffer = new char[length];
    int retval = GetFullPathName(fname, length, Buffer, 0);

    if(length && length>retval)
    {
        filename = Buffer;
        fname = const_cast<char *>( filename.toUTF8() );
        pFile->lpszPathName = fname;
    }

    delete [] Buffer;
}

void EMailSender::SetSubject(const wchar_t *subj)
{
    Subject = subj;
}

void EMailSender::SetSubject(const ptiString &subj)
{
  Subject = subj;
}

void EMailSender::SetMessage(const wchar_t *msg)
{
    Body = msg;
}

void EMailSender::SetMessage(const ptiStringArray &msg)
{
    Body = msg;
}

void EMailSender::AddAttachments(ptiStringArray &filename)
{
    for(int i=0; i<filename.Count(); i++)
        AddAttachment(filename[i]);
}

bool EMailSender::Send(HWND hWndParent)
{
        if (!m_hLib)
                return false;

        LPMAPISENDMAIL SendMail = (LPMAPISENDMAIL) GetProcAddress(m_hLib, "MAPISendMail");

        if (!SendMail)
                return false;


        MapiMessage message;
        ZeroMemory( &message, sizeof(MapiMessage) );
        message.lpszSubject = (LPSTR) Subject.toUTF8();

        MapiFileDesc *pFile = 0;
        int fcnt = Attachments.Count();
        message.nFileCount = fcnt;

        if(fcnt)
        {
            pFile = new MapiFileDesc[fcnt];
            for(int i=0; i<fcnt; i++)
                memcpy( &pFile[i], Attachments[i], sizeof(MapiFileDesc) );

            message.lpFiles = pFile;
        }


        ptiString note( Body.GetText() );
        char *cnote = const_cast<char *>( note.toUTF8() );
        message.lpszNoteText = cnote;

        int nError = SendMail(0, (ULONG)hWndParent, &message, MAPI_LOGON_UI|MAPI_DIALOG, 0);

        if (nError != SUCCESS_SUCCESS && nError != MAPI_USER_ABORT && nError != MAPI_E_LOGIN_FAILURE)
                return false;

        if(pFile)
        delete [] pFile;
        return true;
}