Question

我一直在使用Winforms应用程序中的Mapi32来发送带有附件的新邮件一段时间了，而且效果非常好。（是的，我知道不支持从C＃调用MAPI32。）

在过去几天内，它在Outlook运行时已停止工作。但是，如果Outlook未运行，它将按预期工作。这种情况发生在Vista和XP中。

有没有SOer有这个问题？你是怎么解决的？

以下是我一直在使用的代码：

public class EmailController
{
    [DllImport("MAPI32.DLL", CharSet = CharSet.Ansi)]
    public static extern int MAPISendMail(IntPtr lhSession, IntPtr ulUIParam,
        MapiMessage lpMessage, int flFlags, int ulReserved);
    public const int MAPI_LOGON_UI = 0x00000001;
    private const int MAPI_DIALOG = 0x00000008;

    public static int SendMail(string strAttachmentFileName, string strSubject,string to)
    {

        IntPtr session = new IntPtr(0);
        IntPtr winhandle = new IntPtr(0);

        MapiMessage msg = new MapiMessage();
        msg.subject = strSubject;

        int sizeofMapiDesc = Marshal.SizeOf(typeof(MapiFileDesc));
        IntPtr pMapiDesc = Marshal.AllocHGlobal(sizeofMapiDesc);

        MapiFileDesc fileDesc = new MapiFileDesc();
        fileDesc.position = -1;
        int ptr = (int)pMapiDesc;

        string path = strAttachmentFileName;
        fileDesc.name = Path.GetFileName(path);
        fileDesc.path = path;
        Marshal.StructureToPtr(fileDesc, (IntPtr)ptr, false);

        msg.files = pMapiDesc;
        msg.fileCount = 1;


        List<MapiRecipDesc> recipsList = new List<MapiRecipDesc>();
        MapiRecipDesc recipient = new MapiRecipDesc();

        recipient.recipClass = 1;
        recipient.name = to;
        recipsList.Add(recipient);

        int size = Marshal.SizeOf(typeof(MapiRecipDesc));
        IntPtr intPtr = Marshal.AllocHGlobal(recipsList.Count * size);

        int recipPtr = (int)intPtr;
        foreach (MapiRecipDesc mapiDesc in recipsList)
        {
            Marshal.StructureToPtr(mapiDesc, (IntPtr)recipPtr, false);
            recipPtr += size;
        }

        msg.recips = intPtr;
        msg.recipCount = 1;
        int result = MAPISendMail(session, winhandle, msg, MAPI_LOGON_UI | MAPI_DIALOG, 0);

        return result;
    }
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public class MapiMessage
{
    public int reserved;
    public string subject;
    public string noteText;
    public string messageType;
    public string dateReceived;
    public string conversationID;
    public int flags;
    public IntPtr originator;
    public int recipCount;
    public IntPtr recips;
    public int fileCount;
    public IntPtr files;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public class MapiFileDesc
{
    public int reserved;
    public int flags;
    public int position;
    public string path;
    public string name;
    public IntPtr type;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public class MapiRecipDesc
{
    public int reserved;
    public int recipClass;
    public string name;
    public string address;
    public int eIDSize;
    public IntPtr entryID;
}

Answer 1

如果您的应用程序使用Elevated Privileges（即以管理员身份）运行而Outlook未运行，则发送将失败。您必须告诉用户关闭所有正在运行的Outlook实例，然后重试。

Answer 2

int result = MAPISendMail（session，winhandle，msg，MAPI_LOGON_UI | MAPI_DIALOG，0）;
   return result;

它返回什么？

Answer 3

嗯，除了显而易见的“使用支持的C＃邮件发送方法”评论之外，我想知道mapi32.dll文件是否发生了什么 - 你在Outlook中尝试过“检测并修复”吗？

我还在这里阅读（http://office.microsoft.com/en-us/outlook/HP011164781033.aspx）您可以执行一些步骤（帖子和评论）以使Outlook修复或替换dll。

Outlook正在运行时MAPISendMail不起作用

3 个答案: