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Strange Error With Surface

Submitted by ell on Sun, 10/04/2009 - 05:59

I made a hello world application and it works fine until I make a surface or sprite, I use

backgroundSurface = New Surface("Title.png")

to make a surface but when I run the application I get a NullReference exception (Object reference not set to an instance of an object.) But I though I was making the object with the New keyword, please help and thanks in advance, ell.

‹ Problems with the Music class MDX driver doesn't load PNG image to surfaces in full screen mode ›
#1Submitted by kanato on Fri, 10/09/2009 - 10:51.

Can you post some code?

Can you post some code? Without more information I have no idea what is wrong.
Do you see the color change if you call Display.Clear with different colors after calling BeginFrame?

#2Submitted by ell on Fri, 10/09/2009 - 09:54.

Thanks, it did stop the error

Thanks, it did stop the error occuring, however even though I am calling the Draw method in between BeginFrame and EndFrame, I only see a black screen. I have a surface created from the file "Actor4.png" which is stored in bin>Debug but I cant get it to work! all help appreciated and thanks in advance again.

#3Submitted by kanato on Sun, 10/04/2009 - 22:47.

Oh, also, have you created a

Oh, also, have you created a DisplayWindow object before creating any Surface objects? That is important.

#4Submitted by yanos on Thu, 10/08/2009 - 17:56.

I had the same problem. Move

I had the same problem. Move the line where you create your surface *after* the call to DisplayWindow.CreateWindowed() and it should work. If I put it before, I had this stacktrace:

  1. Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object
  2.   at OpenTK.Graphics.GL.GenTextures (Int32 n, System.Int32& textures) [0x00000]
  3.   at AgateOTK.GL_Surface.LoadFromBitmap (System.Drawing.Bitmap sourceImage) [0x00000]
  4.   at AgateOTK.GL_Surface..ctor (System.IO.Stream st) [0x00000]
  5.   at AgateOTK.GL_Display.CreateSurface (System.IO.Stream fileStream) [0x00000]
  6.   at AgateLib.DisplayLib.Surface..ctor (IFileProvider fileProvider, System.String filename) [0x00000]
  7.   at AgateLib.DisplayLib.Surface..ctor (System.String filename) [0x00000]
  8.   at PataPouf.HelloWorldProgram.Main (System.String[] args) [0x0001d] in /Users/yanos/dev/PataPouf/PataPouf/src/main.cs:26

Hope it helps.

#5Submitted by kanato on Sun, 10/04/2009 - 12:27.

Can you post a stack trace?

Can you post a stack trace? Also, what OS are you using, and what AgateLib driver are you using? (AgateOTK, AgateDrawing, etc.)