解压缩压缩富文本字段

时间:2016-08-15 16:35:58

标签: c# html outlook mapi richtext

我在包含压缩的RichText数据的数据表中有一个image列。我想这是从Outlook(PR_RTF_COMPRESSED属性或其他东西)获得的。我需要解压缩它。使用C#,我尝试了以下操作,但是我得到了一个System.Runtime.InteropServices.COMExceptions并且无法弄清楚。

我找到了几个旧链接问这个问题,没有得到解决的答案。这是我使用c#的代码片段。

 public Form1()
    {
        InitializeComponent();
        IStream streamOut;

        string con = "connection string";
        SqlCommand command = new SqlCommand("select top 10 columnInCompressedRichTextFormat FROM tableWithCompressedRichTextData", new SqlConnection(dbConnectionString));
        DataTable x = new DataTable();
        SqlDataAdapter a = new SqlDataAdapter(command);
        a.Fill(x);
        a.Dispose();

        foreach (DataRow r in dtResults.Rows)
        {
            byte[] arrayOfBytes = (byte[]) r["columnInCompressedRichTextFormat"];
            IStream i = CreateIStreamFromBytes(arrayOfBytes);
            WrapCompressedRTFStream(input, 0, out streamOut);
        }
    }

    public IStream CreateIStreamFromBytes(byte[] bytes)
    {
        IntPtr hglobal = Marshal.AllocHGlobal(bytes.Length);
        Marshal.Copy(bytes, 0, hglobal, bytes.Length);

        IStream stream = null;

        CreateStreamOnHGlobal(hglobal, true, out stream);

        return stream;
    }

    [DllImport("Mapi32.dll", PreserveSig = false)]
    private static extern void
        WrapCompressedRTFStream(
        [MarshalAs(UnmanagedType.Interface)] IStream lpCompressedRTFStream,
        uint ulflags,
        [MarshalAs(UnmanagedType.Interface)] out IStream lpUncompressedRTFStream
        );

    [DllImport("ole32.dll", PreserveSig = false)]
    static extern int CreateStreamOnHGlobal(IntPtr hGlobal,
        [MarshalAs(UnmanagedType.Bool)] bool fDeleteOnRelease,
        [MarshalAs(UnmanagedType.Interface)] out IStream ppstm
        );

    public const uint MAPI_MODIFY = 0x00000001;
    public const uint STORE_UNCOMPRESSED_RTF = 0x00008000;
}

WrapCompressedRTFStream抛出错误。有什么想法吗?

非常感谢。

1 个答案:

答案 0 :(得分:0)