CPU Exceptions on any graphics start

When I try to start any type of graphics it displays random errors. It should start graphics when command “startgui” is executed. The errors are mainly Cpu exception x0D or x06. Also VGAScreen does not work.

My code:

using System;
using System.Collections.Generic;
using System.Threading;
using Sys = Cosmos.System;
using Cosmos.System.Graphics;
using Cosmos.System.FileSystem;
using Cosmos.HAL;
using System.Drawing;

namespace microOS
{
    public class Kernel : Sys.Kernel
    {
        protected override void BeforeRun()
        {
            Console.Clear();
            Console.WriteLine("Starting cmdline...");
            StartCmdLine();
            Console.WriteLine("Done");    
        }

        const string version = "v0.1.3";
        CommandLine cmd;
        GraphicalInterface gui;

        void StartCmdLine() 
        {
            Console.WriteLine("Loading commands...");
            cmd = new CommandLine();
            cmd.InitCommandLine();
            Console.WriteLine($"microOS {version} booted succesfully.");
        }

        void StartGraphicalInterface() 
        {
            gui = new GraphicalInterface();
            gui.InitGUI();
        }

        protected override void Run()
        {
            Console.Write(">>>");
            string cmmd = Console.ReadLine();
            if (cmmd == "startgui")
            {
                Console.WriteLine("Starting graphical interface...");
                StartGraphicalInterface();
            }
            else
            {
                cmd.CheckCommand(cmmd);
            }
        }
    }

    public class GraphicalInterface
    {
        public const string guiver = "v0.0.1";

        Screen screen;

        public void Update()
        {
            screen.FillRectangle(10, 10, 100, 100, new Pen(Color.Black));
        }

        public void InitGUI()
        {
            screen = new Screen(640, 400);
            screen.BackColor = Color.Black;
        }
    }

    public class Screen
    {
        public Color BackColor;
        public VBECanvas canvas;

        public void FillRectangle(int x, int y, int w, int h, Pen pen) 
        {
            canvas.DrawFilledRectangle(pen, x, y, w, h);
        }

        public Screen(int w, int h)
        {
            canvas = (VBECanvas)FullScreenCanvas.GetFullScreenCanvas(new Mode(w, h, ColorDepth.ColorDepth32));
            canvas.Clear();
            canvas.Clear(BackColor);
        }
    }

    public class CommandLine
    {
        public const string cmdver = "v0.0.1";
        
        public void InitCommandLine()
        {
            
        }

        public void CheckCommand(string command) 
        {
            if (command.StartsWith("prnt"))
            {
                Console.WriteLine(command.Substring(5));
            }
            else if(command == "clear") 
            {
                Console.Clear();
            }
            else if (command == "help")
            {
                HelpMenu();
            }
            else if(command == "startgui") 
            {
                
            }
            else
            {
                Console.WriteLine($"Command or file \"{command}\" does not exist.");
            }
        }

        public string[] commands = new string[] { "prnt <text>", "clear", "help" };

        #region Commands

        void HelpMenu()
        {
            Console.Write("List of available commands: ");
            foreach(string command in commands) 
            {
                Console.Write($"{command}, ");
            }
            Console.WriteLine();
        }

        #endregion
    }
}

Screenshots:

[elkaamee326]

Did it display the same output for the VGAScreen? At the moment I would recommend using the VMware SVGAII Canvas, because it is very fast and it is easy to put images on there. I think they are still working on VBE, so for now stick with VMware SVGAII. Also, to know the exception put Console.WriteLine statements between each line that looks suspicous of an error happening and then when it stops at that location put a try and catch block.

[sayaPintar]

ok, thanks!.