Hello forum,
i have a problem to save a 3d graph as an image (jpg file). I searched in this forum how to
save the 3d graph as an image and found a solution but sometimes an error occures (GDI+).
Maybe someone can help me.
Iam using VS 2005 and NI Measurement Studio 8.5 for VS 2005
and here is what I did:
'#
For Iteration As Short = 0 To 100
' some opeartions to generate arrays
' some calculation etc.
'...
' sketch 3d graph with
CW3DGraph.Plot3DParametricSurface(arrX, arrY, arrZ, Type.Missing)
' create image variable to get control of 3d graph
Dim img As System.Drawing.Image = Nothing
Dim Ni3DgraphErrorCounter As Short = 1
'##########
' ERROR GDI+ : create image of 3d graph - if error: repeat process up to 10 times until image is created/saved
Do While Ni3DgraphErrorCounter < 10
' reset image variable for 3dgraph
img = Nothing
' get control of 3dgraph and try to save as image (jpg file)
Try
CW3DGraph.Update()
img = CW3DGraph.ControlImage()
' here GDI+ error occures - but only sometimes!
img.Save(tmpFileFolder & "\3dGraphNo" & (Iteration + 1) & ".JPG", System.Drawing.Imaging.ImageFormat.Jpeg)
' end of error occures
' if image is saved succesfully: do something with saved image
Kill(tmpFileFolder & "3dGraphNo" & (Iteration + 1) & ".JPG") ' delete generated image file
Exit Do ' image creation successful - exit loop
Catch ex As Exception
' error occured -> show user infos in logwindow (but only once)
If Ni3DgraphErrorCounter = 1 Then
' first error message
frmMain.logWindow.Items.Add("")
frmMain.logWindow.Items.Add("ERROR at creating image of 3dGraph " & (Iteration + 1) & " --> repeat process")
frmMain.logWindow.Items.Add(ex)
End If ' check if Ni3DgraphErrorCounter = 1
Ni3DgraphErrorCounter += 1
' thought following instruction can help to provide GDI+ Error - but not working...
Finally
If Not img Is Nothing Then
img.Dispose() ' free resources of 3dgraph image
End If
End Try
Loop
' end of try / catch image creation error
'#####
Next Iteration
'# end of source code
And here is the logWindow Error Message:
'#
ERROR at creating image of 3dGraph 7 --> repeat process
System.Runtime.InteropServices.ExternalException: A generic error occurred in GDI+.
at System.Drawing.Image.Save(String filename, ImageCodecInfo encoder, EncoderParameters encoderParams)
at System.Drawing.Image.Save(String filename, ImageFormat format)
at ProjectName.FormName.SubName(Object sender, EventArgs e)
'#
As you see - the first iterations are working without errors. No problem to save 3dGraph as image.
But after a random number of iterations the GDI+ Error occures and from this point for all following iterations.
I dont know why a GDI+ Error occures because at every iteration iam using a different filename to save the image
and i also delete the generated file at the end of the iteration (if succesfully saved before) and also free resources
with .dispose instruction.
Where is the problem?
Thanks for help
Robert_R
