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ShowImage – Output an image as a binary stream to the Response object

ShowImage – Output an image as a binary stream to the Response object

' Output an image as a binary stream to the Response objectSub ShowImage(ByVal bmp As Bitmap)    ' Clear current content and set returned content type    HttpContext.Current.Response.Clear()    HttpContext.Current.Response.ContentType = "image/jpeg"    ' Save to the Response.OutputStream object    bmp.Save(HttpContext.Current.Response.OutputStream, _        Imaging.ImageFormat.Jpeg)    bmp.Dispose()    HttpContext.Current.Response.End()End Sub' Example:Private Sub Page_Load(ByVal sender As System.Object, _    ByVal e As System.EventArgs) Handles MyBase.Load    ' Create a bitmap with given width, height, and color depth.    Dim bmp As New Bitmap(400, 200, _        Drawing.Imaging.PixelFormat.Format16bppRgb565)    ' Get the underlying Graphics object.    Dim gr As Graphics = Graphics.FromImage(bmp)    ' Clear its background.    gr.Clear(Color.Red)    ' create a font    Dim fnt As New Font("Arial", 16, FontStyle.Regular, GraphicsUnit.Point)    Dim angle As Single    For angle = 0 To 360 Step 30        ' Reset coordinate transforms.        gr.ResetTransform()        ' Translate and rotate the coordinate system.        gr.TranslateTransform(200, 100)        gr.RotateTransform(angle)        ' Draw the (rotated) string.        gr.DrawString("   hello", fnt, Brushes.Yellow, 0, 0)    Next    ' Release resources.    fnt.Dispose()    gr.Dispose()    ShowImage(bmp)End Sub' Note: This code is taken from Francesco Balena's' "Programming Microsoft Visual Basic .NET" - MS Press 2002, ISBN 0735613753' You can read a free chapter of the book at ' http://www.vb2themax.com/HtmlDoc.asp?Table=Books&ID=101000

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