（转）MAPISendMail调用系统默认的邮件客户端发邮件

问题：MAPISendMail如何调用默认的邮件客户端阿？

原文1地址：http://bbs.pfan.cn/showbbs.asp?id=282567&read=self

Option Explicit

Private Type MAPIMessage 'Mail
Reserved As Long
Subject As String
NoteText As String
MessageType As String
DateReceived As String
ConversationID As String
Flags As Long
RecipCount As Long
FileCount As Long
End Type

Private Type MapiRecip 'Recipient
Reserved As Long
RecipClass As Long
Name As String
Address As String
EIDSize As Long
EntryID As String
End Type

Private Type MapiFile 'File
Reserved As Long
Flags As Long
Position As Long
PathName As String
FileName As String
FileType As String
End Type

' MAPI Return Codes
Private Const SUCCESS_SUCCESS = 0
Private Const MAPI_USER_ABORT = 1
Private Const MAPI_E_USER_ABORT = MAPI_USER_ABORT
Private Const MAPI_E_FAILURE = 2
Private Const MAPI_E_LOGIN_FAILURE = 3
Private Const MAPI_E_LOGON_FAILURE = MAPI_E_LOGIN_FAILURE
Private Const MAPI_E_DISK_FULL = 4
Private Const MAPI_E_INSUFFICIENT_MEMORY = 5
Private Const MAPI_E_BLK_TOO_SMALL = 6
Private Const MAPI_E_TOO_MANY_SESSIONS = 8
Private Const MAPI_E_TOO_MANY_FILES = 9
Private Const MAPI_E_TOO_MANY_RECIPIENTS = 10
Private Const MAPI_E_ATTACHMENT_NOT_FOUND = 11
Private Const MAPI_E_ATTACHMENT_OPEN_FAILURE = 12
Private Const MAPI_E_ATTACHMENT_WRITE_FAILURE = 13
Private Const MAPI_E_UNKNOWN_RECIPIENT = 14
Private Const MAPI_E_BAD_RECIPTYPE = 15
Private Const MAPI_E_NO_MESSAGES = 16
Private Const MAPI_E_INVALID_MESSAGE = 17
Private Const MAPI_E_TEXT_TOO_LARGE = 18
Private Const MAPI_E_INVALID_SESSION = 19
Private Const MAPI_E_TYPE_NOT_SUPPORTED = 20
Private Const MAPI_E_AMBIGUOUS_RECIPIENT = 21
Private Const MAPI_E_AMBIG_RECIP = MAPI_E_AMBIGUOUS_RECIPIENT
Private Const MAPI_E_MESSAGE_IN_USE = 22
Private Const MAPI_E_NETWORK_FAILURE = 23
Private Const MAPI_E_INVALID_EDITFIELDS = 24
Private Const MAPI_E_INVALID_RECIPS = 25
Private Const MAPI_E_NOT_SUPPORTED = 26

Private Const MAPI_ORIG = 0 'Recipient-Flags
Private Const MAPI_TO = 1
Private Const MAPI_CC = 2
Private Const MAPI_BCC = 3

Private Const MAPI_LOGON_UI = &H1 'Logon Flags
Private Const MAPI_NEW_SESSION = &H2
Private Const MAPI_FORCE_DOWNLOAD = &H1000

Private Const MAPI_LOGOFF_SHARED = &H1 'Logoff Flags
Private Const MAPI_LOGOFF_UI = &H2

Private Const MAPI_DIALOG = &H8 'Send-Mail-Flags
Private Const MAPI_NODIALOG = 0

Private Const MAPI_OLE = &H1
Private Const MAPI_OLE_STATIC = &H2

Private Const MAPI_UNREAD = &H1 'Mail-Flags
Private Const MAPI_RECEIPT_REQUESTED = &H2
Private Const MAPI_SENT = &H4

Private Declare Function MAPILogon Lib "MAPI32.DLL" (ByVal UIParam As Long, _
ByVal User As String, ByVal Password As String, ByVal Flags As Long, _
ByVal Reserved As Long, Session As Long) As Long
Private Declare Function MAPILogoff Lib "MAPI32.DLL" (ByVal Session As Long, _
ByVal UIParam As Long, ByVal Flags As Long, ByVal Reserved As Long) As Long
Private Declare Function MAPISendMail Lib "MAPI32.DLL" Alias "BMAPISendMail" _
(ByVal Session As Long, ByVal UIParam As Long, Message As MAPIMessage, _
Recipient() As MapiRecip, File() As MapiFile, ByVal Flags As Long, _
ByVal Reserved As Long) As Long
Private Declare Function MAPISendDocuments Lib "MAPI32.DLL" (ByVal UIParam As Long, _
ByVal DelimStr As String, ByVal FilePaths As String, ByVal FileNames As String, _
ByVal Reserved As Long) As Long

'---------------------------------------------------------------------------

Function SendIt(sRecip As String, sTitle As String, sText As String, sFile As String) As Boolean
Dim strTemp As String
Dim strError As String
Dim lngIndex As Long
Dim iFileCount As Integer

Dim mRecip(0) As MapiRecip, mFile() As MapiFile, mMail As MAPIMessage
Dim lSess As Long, lRet As Long

On Error GoTo ErrorHandler
SendIt = False

'Add 2 trailing spaces to the text, this will be the position where the attachment goes to
sText = sText & " "

'Recipient
With mRecip(0)
.Name = sRecip
.RecipClass = MAPI_TO
End With

'File to send?
If sFile <> "" Then
ReDim mFile(0)
With mFile(0)
.FileName = sFile
.PathName = sFile
.Position = Len(sText) - 1
.FileType = ""
.Reserved = 0
End With
iFileCount = 1
End If

'Create Mail
With mMail
.Subject = sTitle
.NoteText = sText
.Flags = 0
.FileCount = iFileCount
.RecipCount = 1
.Reserved = 0
.DateReceived = ""
.MessageType = ""
End With

'Post it
'Logon: User = "" and Password = ""
lRet = MAPILogon(0, "", "", MAPI_LOGON_UI, 0, lSess)
If lRet <> SUCCESS_SUCCESS Then
strError = "Error logging into messaging software. (" & CStr(lRet) & ")"
GoTo ErrorHandler
End If

'Send the mail to the given recipients with the attached file without showing a dialog
lRet = MAPISendMail(lSess, 0, mMail, mRecip, mFile, MAPI_NODIALOG, 0)
If lRet <> SUCCESS_SUCCESS And lRet <> MAPI_USER_ABORT Then
If lRet = 14 Then
strError = "Recipient not found"
Else
strError = "Error sending: " & CStr(lRet)
End If
GoTo ErrorHandler
End If

lRet = MAPILogoff(lSess, 0, 0, 0)

SendIt = True
Exit Function

ErrorHandler:
If strError = "" Then strError = Err.Description
Call MsgBox(strError, vbExclamation, "MAPI-Error")
End Function

'------------------------------------------------------------------------------------------------

Sub eMailActiveWorkbook()
Dim Wb As Workbook

Application.ScreenUpdating = False
Set Wb = ActiveWorkbook
Wb.Save

SendIt "me@here.com", "A new Document", "Hi, read this:", Wb.FullName

Application.ScreenUpdating = True
Set Wb = Nothing
End Sub

原文2地址：http://topic.csdn.net/t/20050726/15/4169005.html

//加载MAPI32.DLL动态库
HMODULE hMod = LoadLibrary( "MAPI32.DLL ");

if (hMod == NULL) //加载动态库失败
{
AfxMessageBox(AFX_IDP_FAILED_MAPI_LOAD);
return -1;
}

//获取发送邮件的函数地址
ULONG (PASCAL *lpfnSendMail)(ULONG, ULONG, MapiMessage*, FLAGS, ULONG);
(FARPROC&)lpfnSendMail = GetProcAddress(hMod, "MAPISendMail ");

if (lpfnSendMail == NULL)
{
AfxMessageBox(AFX_IDP_INVALID_MAPI_DLL);
return -1;
}

int nFileCount = nCount; //有多少个附件需要发送

//分配内存保存附件信息 不能使用静态数组，因为不知道要发送附件的个数
MapiFileDesc* pFileDesc = (MapiFileDesc*)malloc(sizeof(MapiFileDesc) * nFileCount);
memset(pFileDesc,0,sizeof(MapiFileDesc) * nFileCount);

//分配内存保存附件文件路径
TCHAR* pTchPath = (TCHAR*)malloc(MAX_PATH * nFileCount);

CString szText;
for(int i = 0;i < nFileCount;i++)
{
TCHAR* p = pTchPath + MAX_PATH * i;
strcpy(p,file[i]);

(pFileDesc + i)-> nPosition = (ULONG)-1;
(pFileDesc + i)-> lpszPathName = p;
(pFileDesc + i)-> lpszFileName = p;
}

//收件人结构信息
MapiRecipDesc recip;
memset(&recip,0,sizeof(MapiRecipDesc));

char caddress[1024];
memset(caddress,0,1024);
strcpy(caddress,add);
CString straddresslist;
straddresslist=caddress;

recip.lpszAddress =caddress;
recip.ulRecipClass = MAPI_TO;
// if (straddresslist.IsEmpty())
// recip.lpszName= "no empty ";

//邮件结构信息
MapiMessage message;
memset(&message, 0, sizeof(message));
message.nFileCount = nFileCount; //文件个数
message.lpFiles = pFileDesc; //文件信息
message.nRecipCount = 1; //收件人个数
message.lpRecips = &recip; //收件人
// message.lpszSubject = m_szSubject.GetBuffer(0); //主题
// message.lpszNoteText= m_szText.GetBuffer(0); //正文内容

//保存本程序窗口指针，因为发完邮件后要返回本程序的窗口
CWnd* pParentWnd = CWnd::GetSafeOwner(NULL, NULL);

//发送邮件
int nError = lpfnSendMail(0, 0,
&message, MAPI_LOGON_UI|MAPI_DIALOG, 0);

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

//返回程序
pParentWnd-> SetActiveWindow();

//释放分配的内存
free(pFileDesc);
free(pTchPath);
FreeLibrary(hMod);