调用哪个类可以实现发送SMTP协议的邮件

Question

调用哪个类可以实现发送SMTP协议的邮件

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Cedar

Answer 1

补充：开发语言为C++，visual studio 2008

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Cedar

Answer 2

发邮件有两种选择，1)MAPI 2) Windows Mail

MAPI:
http://msdn.microsoft.com/zh-cn/library/cc485655%28VS.71%29.aspx

Windows Mail 实际上是用Outlook Express 的功能帮你发邮件，其实Office 的Outlook 也是用这个组件发邮件的。这个组件是COM的，可以使用ISMTPTransport接口的SendMessage 发邮件。 在Window 7上微软已经决定弃用Windows Mail了，但在Vista XP 下都是可用的。

Answer 3

这儿还有一个在Socket 层面上自己做的：
http://stackoverflow.com/questions/58210/c-smtp-example

Answer 4

谢谢您的解答。根据您的解释我清楚了：
MAPI 需要读取文件以发送附件。如果应用程序使其数据文件在 OnFileSendMail 函数调用期间一直保持打开，则该文件需要以共享模式打开以便可由多个进程访问。

请问如果不发送附件，邮件内容只用正文没有附件也可以用MAPI发送吗，如果不能还有其他的函数(除了 Windows Mail)可以调用吗？

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Cedar

Answer 5

void CDocument::OnFileSendMail()
{
	ASSERT_VALID(this);
	ASSERT(_afxIsMailAvail);   // update handler always gets called first

	CWaitCursor wait;

	_AFX_MAIL_STATE* pMailState = _afxMailState;
	if (pMailState->m_hInstMail == NULL)
		pMailState->m_hInstMail = ::AfxCtxLoadLibraryA("MAPI32.DLL");

	if (pMailState->m_hInstMail == NULL)
	{
		AfxMessageBox(AFX_IDP_FAILED_MAPI_LOAD);
		return;
	}
	ASSERT(pMailState->m_hInstMail != NULL);

	ULONG (PASCAL *lpfnSendMail)(ULONG, ULONG_PTR, MapiMessage*, FLAGS, ULONG);
	(FARPROC&)lpfnSendMail = GetProcAddress(pMailState->m_hInstMail, "MAPISendMail");
	if (lpfnSendMail == NULL)
	{
		AfxMessageBox(AFX_IDP_INVALID_MAPI_DLL);
		return;
	}
	ASSERT(lpfnSendMail != NULL);

	TCHAR szTempName[_MAX_PATH];
	TCHAR szPath[_MAX_PATH];
	BOOL bRemoveTemp = FALSE;
	if (m_strPathName.IsEmpty() || IsModified())
	{
		// save to temporary path
		VERIFY(GetTempPath(_countof(szPath), szPath) != 0);
		VERIFY(GetTempFileName(szPath, _T("afx"), 0, szTempName) != 0);

		// save it, but remember original modified flag
		BOOL bModified = IsModified();
		BOOL bResult = DoSave(szTempName, FALSE);
		SetModifiedFlag(bModified);
		if (!bResult)
		{
			TRACE(traceAppMsg, 0, "Warning: file save failed during File.Send Mail.\n");
			return;
		}
		bRemoveTemp = TRUE;
	}
	else
	{
		// use actual file since it isn't modified
		Checked::tcsncpy_s(szTempName, _countof(szTempName), m_strPathName, _TRUNCATE);
	}
#ifdef _UNICODE
	char szTempNameA[_MAX_PATH];
	_wcstombsz(szTempNameA, szTempName, _countof(szTempNameA));
#endif

	// build an appropriate title for the attachment
	TCHAR szTitle[_MAX_PATH];
	if (!m_strPathName.IsEmpty())
		AfxGetFileName(m_strPathName, szTitle, _countof(szTitle));
	else
	{
		Checked::tcsncpy_s(szTitle, _countof(szTitle), m_strTitle, _TRUNCATE);
		if (CString(::PathFindExtension(m_strTitle)).GetLength() == 0) // no extension
		{
			// append the default suffix if there is one
			CString strExt;
			CDocTemplate* pTemplate = GetDocTemplate();
			if (pTemplate != NULL &&
				pTemplate->GetDocString(strExt, CDocTemplate::filterExt))
			{
				if( lstrlen(szTitle) + lstrlen(strExt) < _countof(szTitle) )
				{
					Checked::tcscat_s(szTitle, _countof(szTitle), strExt);
				}
			}
		}
	}

#ifdef _UNICODE
	char szTitleA[_MAX_PATH];
	_wcstombsz(szTitleA, szTitle, _countof(szTitleA));
#endif

	// prepare the file description (for the attachment)
	MapiFileDesc fileDesc;
	memset(&fileDesc, 0, sizeof(fileDesc));
	fileDesc.nPosition = (ULONG)-1;
#ifdef _UNICODE
	fileDesc.lpszPathName = szTempNameA;
	fileDesc.lpszFileName = szTitleA;
#else
	fileDesc.lpszPathName = szTempName;
	fileDesc.lpszFileName = szTitle;
#endif

	// prepare the message (empty with 1 attachment)
	MapiMessage message;
	memset(&message, 0, sizeof(message));
	message.nFileCount = 1;
	message.lpFiles = &fileDesc;

	// prepare for modal dialog box
	AfxGetApp()->EnableModeless(FALSE);
	HWND hWndTop;
	CWnd* pParentWnd = CWnd::GetSafeOwner(NULL, &hWndTop);

	// some extra precautions are required to use MAPISendMail as it
	// tends to enable the parent window in between dialogs (after
	// the login dialog, but before the send note dialog).
	pParentWnd->SetCapture();
	::SetFocus(NULL);
	pParentWnd->m_nFlags |= WF_STAYDISABLED;

	int nError = lpfnSendMail(0, (ULONG_PTR)pParentWnd->GetSafeHwnd(),
		&message, MAPI_LOGON_UI|MAPI_DIALOG, 0);

	// after returning from the MAPISendMail call, the window must
	// be re-enabled and focus returned to the frame to undo the workaround
	// done before the MAPI call.
	::ReleaseCapture();
	pParentWnd->m_nFlags &= ~WF_STAYDISABLED;

	pParentWnd->EnableWindow(TRUE);
	::SetActiveWindow(NULL);
	pParentWnd->SetActiveWindow();
	pParentWnd->SetFocus();
	if (hWndTop != NULL)
		::EnableWindow(hWndTop, TRUE);
	AfxGetApp()->EnableModeless(TRUE);

	if (nError != SUCCESS_SUCCESS &&
		nError != MAPI_USER_ABORT && nError != MAPI_E_LOGIN_FAILURE)
	{
		AfxMessageBox(AFX_IDP_FAILED_MAPI_SEND);
	}

	// remove temporary file, if temporary file was used
	if (bRemoveTemp)
		CFile::Remove(szTempName);
}

void CDocument::OnUpdateFileSendMail(CCmdUI* pCmdUI)
{
	ASSERT_VALID(this);

	if (_afxIsMailAvail == (BOOL)-1)
	{
		_afxIsMailAvail = ::GetProfileInt(_T("MAIL"), _T("MAPI"), 0) != 0 &&
			SearchPath(NULL, _T("MAPI32.DLL"), NULL, 0, NULL, NULL) != 0;
	}

	// enable the Send... menu item if available
	pCmdUI->Enable(_afxIsMailAvail);
	CMenu* pMenu = pCmdUI->m_pMenu;
	if (!_afxIsMailAvail && pMenu != NULL)
	{
		// remove the Send... menu and surrounding separators
		UINT nStateAbove = pMenu->GetMenuState(pCmdUI->m_nIndex-1, MF_BYPOSITION);
		UINT nStateBelow = pMenu->GetMenuState(pCmdUI->m_nIndex+1, MF_BYPOSITION);
		pMenu->RemoveMenu(pCmdUI->m_nIndex, MF_BYPOSITION);
		if (nStateAbove & nStateBelow & MF_SEPARATOR)
		{
			// a separator must be removed since the Send... is gone
			if (nStateAbove != (UINT)-1)
				pMenu->RemoveMenu(pCmdUI->m_nIndex-1, MF_BYPOSITION);
			else if (nStateBelow != (UINT)-1)
				pMenu->RemoveMenu(pCmdUI->m_nIndex, MF_BYPOSITION);
		}
	}
}

以上就是MFC的CDocument 类的实现代码，实际上是通过调用位于MAPI32.dll 动态库中的MAPISendMail 函数来实现邮件发送的。 默认的行为CDoument 会调用默认的邮件处理程序，弹出新建邮件界面。

你只需要 在自己的Document 类中，重载CDocument 的OnFileSendMail 函数，并对基类的代码进行适当剪裁，就可以实现了。主要是忽略DoSave 之类的保存文档的相关操作，忽略MAPIFileDesc 结构体的填充。 对MapiMessage 结构体填充发送地址，邮件内容等信息就可以了。

Answer 6

Good~:)

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