i want to show the photo on Form2 by double cliking on the thumbnail
i m using list view for generating thumbnail of each image
i m retrieving images from sql server data base
actually i want to invoke double click event of List View so that i can see the image on Form2
i have written below method to show photo on form2
CODE
Private FotoInstance As frmPic
Private Sub ShowImage(ByVal bmp As Image)
FotoInstance.PictureBox1.Width = 150
FotoInstance.PictureBox1.Height = 115
FotoInstance.PictureBox1.Image = New Bitmap(bmp)
FotoInstance.PictureBox1.SizeMode = PictureBoxSizeMode.StretchImage
End Sub
in second method i try to load image from data base and here i call previous method"Show Image"
CODE
Private Sub Thumbnail(ByVal item As ListViewItem)
Try
' Create a command to select the selected photo
Dim strCmd As String = [String].Format("SELECT photo FROM Photos WHERE id = {0}", item.ListView)
Dim cmd As New SqlCommand(strCmd, SqlConn)
' Get bytes return from stored proc
Dim b As Byte() = CType(cmd.ExecuteScalar(), Byte())
If b.Length > 0 Then
' Open a stream for the image and write the bytes into it
Dim stream As New System.IO.MemoryStream(b, True)
stream.Write(b, 0, b.Length)
' Draw photo to scale of picturebox
ShowImage(New Bitmap(stream))
' Close the stream and delete the temp file
stream.Close()
End If
Catch e As Exception
MessageBox.Show(e.Message)
End Try
End Sub
and lastly here i invoke double click event of List View to show the image on form2
CODE
Private Sub thumbList_DoubleClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles thumbList.DoubleClick
Try
Dim item As ListViewItem
Thumbnail(item)
Catch ex As Exception
End Try
End Sub
but when i double click on a thumbnail then this message is displayed"Object reference not set to an instance of an object"
plz kindly tell me how can I properly show the image on form by just clicking on thumbnail
kindly guide me
* Remember that i load images from database not from disk.
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