How to add image from database to PictureBox?

Question

I am using this to get image bytes from the database

cmd.CommandText = \"select imagedate from projectimages where imagename = \'\" + _
    ListBox1.Text + \         


        

Answer 1

Use a MemoryStream object as per Microsoft.

Answer 2

I was getting the parameter not valid error as well. To fix, I added a picturebox to my form that loads the image I'm copying to the SQL server as a background image. This statement seems to be key:

PictureBox1.BackgroundImage.Save(ms, PictureBox1.BackgroundImage.RawFormat)

It makes the actual upload take a lot longer, but I'm no longer getting the parameter error... I think because the pictures are actually valid images now.

        SSScmd.CommandText = "INSERT INTO PreviewSlideshow (Name, Photo) VALUES (@name, @photo)"

        Dim p As New SqlParameter("@photo", SqlDbType.Image)

        For Each CurFile As IO.FileInfo In New IO.DirectoryInfo(sSourcePath).GetFiles

            If CurFile.Name = "Thumbs.db" Then
                'skip
            Else

                If CurFile.Extension = "jpg" Or CurFile.Extension = "png" Then

                    'show the image name on the form
                    ImageName.Text = CurFile.Name

                    SSScmd.Parameters.AddWithValue("@name", ImageName.Text)

                    Dim ms As New MemoryStream()

                    PictureBox1.BackgroundImage = Image.FromFile(sSourcePath & CurFile.Name)

                    PictureBox1.BackgroundImageLayout = ImageLayout.Stretch

                    PictureBox1.BackgroundImage.Save(ms, PictureBox1.BackgroundImage.RawFormat)

                    Dim data As Byte() = ms.GetBuffer()

                    p.Value = data

                    SSScmd.Parameters.Add(p)

                    SSScmd.ExecuteNonQuery()

                    SSScmd.Parameters.Clear()



                End If
            End If

        Next

Answer 3

here's my code to show blob file to picturebox in vb.net. hope it helps

Dim connstring As String = "Database=pmk;data source=localhost;user id=root;password="
Dim Sql As String = "select * from mastermahasiswa where Nim='" & TextBox1.Text & "'"
Dim conn As New MySqlConnection(connstring)
Dim cmd As New MySqlCommand(Sql, conn)
Dim dr As MySqlDataReader = Nothing
conn.Open()
dr = cmd.ExecuteReader()
dr.Read()
Dim imagebytes As Byte() = CType(dr("Foto"), Byte())
Using ms As New IO.MemoryStream(imagebytes)
    PictureBox1.Image = Image.FromStream(ms)
    PictureBox1.SizeMode = PictureBoxSizeMode.StretchImage
End Using
conn.Close()

Answer 4

After 5-6 hours of searching forums and blogs and everything i fond this... to save image to database

1- datatype should be image in database

Now add this code when storing image to the sql database

    OpenFileDialog1.ShowDialog()
    imageFilename = OpenFileDialog1.FileName
    Dim imageUpload As Image
    imageUpload = Image.FromFile(OpenFileDialog1.FileName)



    If imageFilename <> "" Then

        Dim imageNameTemp As String

        imageNameTemp = imageFilename

        While (imageNameTemp.Contains("\"))


            imageNameTemp = imageNameTemp.Remove(0, imageNameTemp.IndexOf("\") + 1)
        End While

        Dim ms As New IO.MemoryStream

        If imageFilename.Contains("jpeg") Or imageFilename.Contains("jpg") Then
            imageUpload.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg)

        End If
        If imageFilename.Contains("png") Then
            imageUpload.Save(ms, System.Drawing.Imaging.ImageFormat.Png)
        End If
        If imageFilename.Contains("gif") Then
            imageUpload.Save(ms, System.Drawing.Imaging.ImageFormat.Gif)
        End If
        If imageFilename.Contains("bmp") Then
            imageUpload.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp)
        End If

        'Dim cmd As New SqlCommand("INSERT INTO projectimages (imagename,imagedate,csvprojectref) VALUES ('" + imageFilename + "',@BLOBData,CHECKSUM('" + textboxFileRef.Text + "'))", con)

        Dim b() As Byte = ms.ToArray()

        Dim cmd As New SqlCommand("INSERT INTO projectimages (imagename,imagedate,csvprojectref) VALUES ('" + imageNameTemp + "',@BLOBData,CHECKSUM('" + textboxFileRef.Text + "'))", con)

        cmd.Parameters.Add("@BLOBData", SqlDbType.Image, b.Length).Value = b
        '    Dim cmd As New SqlCommand("insert projectimages(imagename,imagedate,csvprojectref) values('imagma','" + img + "',CHECKSUM('" + textboxFileRef.Text + "'))", con)

        cmd.ExecuteNonQuery()

        '  cmdTemp.Parameters.Add("@photo", SqlDbType.Image, b.Length).Value = b

    End If

And when to retrieve data to insert into picture box use this code...

  cmd.CommandText = "select imagedate from projectimages where imagename = '" +      ListBox1.Text + "' and CSVprojectref=checksum('" + textboxFileRef.Text + "')"


        cmd.Connection = con
        Dim da As New SqlDataAdapter(cmd)
        Dim ds As New DataSet()
        da.Fill(ds, "projectimages")
        Dim c As Integer = ds.Tables(0).Rows.Count
        If c > 0 Then
            Dim bytBLOBData() As Byte = _
                ds.Tables(0).Rows(c - 1)("imagedate")
            Dim stmBLOBData As New MemoryStream(bytBLOBData)
            PictureBox1.Image = Image.FromStream(stmBLOBData)
        End If

Answer 5

Dim img As Byte() = DirectCast(cmd.ExecuteScalar(), Byte())
Dim ms as MemoryStream = New MemoryStream(img)
pictureBox.Image = Image.FromStream(ms)

assuming imagedate field a blob field.