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POVB.net - insert/retrieve picture from mysql Database directly to/from a Picturebox
 

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  1. POVB.net - insert/retrieve picture from mysql Database directly to/from a Picturebox
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    <p>I'm am having a heck of a time finding a code snippet that works for this. I have got to the point where it appears the picture is stored as a blob (perhaps incorrectly) by using this code.</p> <pre><code> Dim filename As String = txtName.Text + ".jpg" Dim FileSize As UInt32 Dim ImageStream As System.IO.MemoryStream ImageStream = New System.IO.MemoryStream PbPicture.Image.Save(ImageStream, System.Drawing.Imaging.ImageFormat.Jpeg) ReDim rawdata(CInt(ImageStream.Length - 1)) ImageStream.Position = 0 ImageStream.Read(rawdata, 0, CInt(ImageStream.Length)) FileSize = ImageStream.Length Dim query As String = ("insert into actors (actor_pic, filename, filesize) VALUES (?File, ?FileName, ?FileSize)") cmd = New MySqlCommand(query, conn) cmd.Parameters.AddWithValue("?FileName", filename) cmd.Parameters.AddWithValue("?FileSize", FileSize) cmd.Parameters.AddWithValue("?File", rawData) cmd.ExecuteNonQuery() MessageBox.Show("File Inserted into database successfully!", _ "Success!", MessageBoxButtons.OK, MessageBoxIcon.Asterisk) </code></pre> <p>but on retieving to the picturebox using the following code:</p> <pre><code> Private Sub GetPicture() 'This retrieves the pictures from a mysql DB and buffers the rawdata into a memorystream Dim FileSize As UInt32 Dim rawData() As Byte Dim conn As New MySqlConnection(connStr) conn.Open() conn.ChangeDatabase("psdb") Dim cmd As New MySqlCommand("SELECT actor_pic, filesize, filename FROM actors WHERE actor_name = ?autoid", conn) Cmd.Parameters.AddWithValue("?autoid", Actor1Box.Text) Reader = cmd.ExecuteReader Reader.Read() 'data is in memory FileSize = Reader.GetUInt32(Reader.GetOrdinal("filesize")) rawData = New Byte(FileSize) {} 'get the bytes and filesize Reader.GetBytes(Reader.GetOrdinal("actor_pic"), 0, rawData, 0, FileSize) Dim ad As New System.IO.MemoryStream(100000) ' Dim bm As New Bitmap ad.Write(rawData, 0, FileSize) Dim im As Image = Image.FromStream(ad) * "error occurs here" (see below) Actor1Pic.Image = im Reader.Close() conn.Close() conn.Dispose() ad.Dispose() </code></pre> <p>I get the error "parameter not valid" in the area noted. FYI If anyone even has some better (working) code examples than this that I can plug in versus debugging this mess that would be great too.</p>
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    1. COsame error with Dim ad As New System.IO.MemoryStream()
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      1. POVB.net - insert/retrieve picture from mysql Database directly to/from a Picturebox
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