C#•15mo ago

How do I fix 'Object reference not set to an instance of an object.'?

I have an app that you can change the background in. The background of a panel in Form1 is set with this function:

public void SetPanelBackgroundImage(Image backgroundImage)
{
      Form1.back_panel.BackgroundImage = backgroundImage;
}

public void SetPanelBackgroundImage(Image backgroundImage)
{
      Form1.back_panel.BackgroundImage = backgroundImage;
}

back_panel is set to Public so it can be accessed from my other form (UC_tab_theme.cs) and Form1 is instanced from

Form1 Form1;

Form1 Form1;

The parameter that I pass into my SetPanelBackgroundImage() function is Properties.Resources.blob_scene_haikei which is a valid path to the image. I get error:

System.NullReferenceException
  HResult=0x80004003
  Message=Object reference not set to an instance of an object.
  Source=ProtoSploit
  StackTrace:
   at ProtoSploit.res.UCs.UC_tab_theme.SetPanelBackgroundImage(Image backgroundImage)

System.NullReferenceException
  HResult=0x80004003
  Message=Object reference not set to an instance of an object.
  Source=ProtoSploit
  StackTrace:
   at ProtoSploit.res.UCs.UC_tab_theme.SetPanelBackgroundImage(Image backgroundImage)

I'm new and I don't particularly understand c# yet, so I hope one of you can help.

2 Replies

Pobiega•15mo ago

you are trying to access a property/method on something that has a null value it's likely either Form1 or back_panel here I'm curious what kind or program "ProtoSploit" is thou, if you could tell me more about what it does?

dismalOP•15mo ago

its a small dbg app with proto meaning prototype and sploit, exploiting the win32 api to hook into apps

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How do I fix 'Object reference not set to an instance of an object.'?