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Save bitmaps to SQL database and retrieve bitmaps from SQL database.

Posted on 2009-03-31
2
522 Views
Last Modified: 2013-12-26
I am saving bitmap to the SQL database as follows:

Adding input parameter to the stored procedure as follows:
dim MyPhoto  as system.Drawing.Bitmap
objCmd.Parameters("@imgInPhoto").Value = BitmapToByteArray(Me.MyPhoto)


Here is the utility function to convert bitmap to Byte array:
 Public Function BitmapToByteArray(ByRef SourceImage As System.Drawing.Bitmap) As Byte()
        If IsNothing(SourceImage) Then
            Dim objResult(0) As Byte
            Return objResult
        Else
            ' Local Variables.
            Dim objStream As New System.IO.MemoryStream()

            ' Get the data into a stream
            SourceImage.Save(objStream, System.Drawing.Imaging.ImageFormat.Bmp)
            objStream.Position = 0

            ' Now that we know the size, create our byte array.
            Dim objResult(Convert.ToInt32(objStream.Length)) As Byte

            ' Copy the data from the stream to the byte array.
            objStream.Read(objResult, 0, Convert.ToInt32(objStream.Length))

            ' return the results.
            Return objResult
        End If
    End Function

Saving Works fine.

Retrieving the Bitmap from database follows:

Dim imageListLarge As New ImageList()
imageListLarge.ImageSize = New Size(150, 150)
imageListLarge.ColorDepth = ColorDepth.Depth32Bit
ListView1.View = View.LargeIcon
ListView1.LargeImageList = imageListLarge

 For Each i As DataRow In ds.Tables(0).Rows
            Dim objStream As New IO.MemoryStream(CType(i.Item("CrashPhoto"), Byte()))
            Static pb As New PictureBox
            pb.Size = imageListLarge.ImageSize
            pb.BackColor = ListView1.BackColor
            pb.SizeMode = PictureBoxSizeMode.Zoom

            j = j + 1
            pb.Image = New System.Drawing.Bitmap(objStream)
            Dim bmp As New Bitmap(pb.Width, pb.Height)
            pb.DrawToBitmap(bmp, pb.ClientRectangle)
            Dim key As String = j.ToString
            imageListLarge.Images.Add(j, bmp)
            ListView1.Items.Add("Pic #" & j, key)
        Next

My question is images are not showing properly, they are very blurred.
How to display images properly in the Listview.
0
Comment
Question by:Indyvasi
2 Comments
 
LVL 85

Accepted Solution

by:
Mike Tomlinson earned 100 total points
ID: 24032965
Pretty sure you're doing an unnecessary array copy in your "save" routine:

    Public Function BitmapToByteArray(ByRef SourceImage As System.Drawing.Bitmap) As Byte()
        If IsNothing(SourceImage) Then
            Dim objResult(0) As Byte
            Return objResult
        Else
            ' Local Variables.
            Dim objStream As New System.IO.MemoryStream()
            SourceImage.Save(objStream, System.Drawing.Imaging.ImageFormat.Bmp)
            Return objStream.ToArray
        End If
    End Function

In your load method, try this line instead:

    pb.Image = Image.FromStream(objStream)

Note sure that will make much difference.
0
 

Author Closing Comment

by:Indyvasi
ID: 31565032
Worked.
Thank you very much.
0

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