C# 在C中从MySQL检索LONGBLOB

我想从MySQL数据库中检索LONGBLOB，但我不知道如何检索。我搜索了interwebz，没有找到任何真正有用的东西。检索LONGBLOB时，我希望将其保存为图像

这是我已经尝试过的：

        int bufferSize = 100;
        byte[] bin = new byte[bufferSize];
        long retval = 0;
        long startIndex = 0;

        MemoryStream ms = null;
        Image image = null;

        MySqlCommand command = new MySqlCommand("select * from image where uid = @uid", Connection.Connect());
        command.Parameters.AddWithValue("@uid", "2");
        MySqlDataReader reader = command.ExecuteReader();

        if (reader.Read())
        {
            retval = reader.GetBytes(reader.GetOrdinal("logo"), startIndex, bin, 0, bufferSize);
        }


        ms = new MemoryStream(bin);
        image = Image.FromStream(ms);

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提前谢谢。

我不确定，但我想你可以试试这个：

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stefan

实际上，我是在一个项目中做这件事的

public Bitmap loadImage(int imgID) { MySqlDataReader myData; MySqlCommand cmd = new MySqlCommand(); string SQL; byte[] rawData; MemoryStream ms; UInt32 FileSize; Bitmap outImage; SQL = "SELECT ImageName, ImageSize, Image FROM Images WHERE ImageID ="; SQL += imgID.ToString(); try { cmd.Connection = connection; cmd.CommandText = SQL; myData = cmd.ExecuteReader(); if (!myData.HasRows) throw new Exception("There are no blobs to save"); myData.Read(); FileSize = myData.GetUInt32(myData.GetOrdinal("ImageSize")); rawData = new byte[FileSize]; myData.GetBytes(myData.GetOrdinal("Image"), 0, rawData, 0, (Int32)FileSize); ms = new MemoryStream(rawData); outImage = new Bitmap(ms); ms.Close(); ms.Dispose(); myData.Close(); myData.Dispose(); cmd.Dispose(); return outImage; } catch (MySqlException ex) { MessageBox.Show(ex.Message); return null; } } 希望这有帮助。另外，请原谅任何不好的编码实践，这是前一段时间写的

谢谢

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Tom

获取错误：image=image.fromstreams；参数无效。