如何在sdl.net中初始化表面变量?

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问题描述

我正在使用Visual C#2010 Express和SDL.net图形库.

I'm working with Visual C# 2010 Express and SDL.net graphics library.

我尝试使用SurfaceControl类在winform上绘画，并且无法创建要绘画的空表面.虽然在 http://cs-sdl.sourceforge.net/apidocs/html/class_sdl_dot_net_1_1_graphics_1_1_surface.html

I try to paint on winform with SurfaceControl Class, and can't create an empty surface to draw on. I found only one working example with bitmap, although there is such method in http://cs-sdl.sourceforge.net/apidocs/html/class_sdl_dot_net_1_1_graphics_1_1_surface.html

Surface (int width, int height) // "Create surface of a given width and height."`

我的代码:

private void surfaceControl1_Click(object sender, EventArgs e)
{
  Surface surf = new Surface((Bitmap)Bitmap.FromFile("example.png"));
  surfaceControl1.Blit(surf, new Point(0, 0));
  surfaceControl1.Blit(surf, new Point(20, 20));
  // this works

  Surface surf2 = new Surface(20, 20); // <- throws exception on click
  surf2.Fill(Color.White);
  surfaceControl1.Blit(surf2);
}

也尝试过:

  Surface surf2 = new Surface(this.surfaceControl1.Width,this.surfaceControl1.Height);

NullReferenceException未处理你调用的对象是空的.故障排除提示:使用新"关键字创建对象实例.等等.

NullReferenceException was unhandledObject reference not set to an instance of an object.Troubleshooting tips:Use the "new" keyword to create an object instance.. etc.

SDl.net有带有源代码的示例文件，它使用与我相同的方法来初始化表面变量，但是我的方法引发异常.找不到使用SurfaceControl的示例或教程.有什么想法我做错了吗?

SDl.net has example files with sources, it uses same method to initialize surface variable as i do, but mine throws exception. Can't find examples or tutorials with SurfaceControl usage. Any ideas what i am doing wrong?

还找到了本教程 http://www.microbasic.net/2011/08/using-sdl-with-c/它使用以下代码:

Also found this tutorial http://www.microbasic.net/2011/08/using-sdl-with-c/It uses this code:

Surface surface = new Surface(100, 100); //same error here
Surface item = new Surface((Bitmap)Bitmap.FromFile("example.png"));
surface.Blit(item, new Point(0, 0));
surface.Blit(item, new Point(20, 20));
this.surfaceControl.Blit(surface);

但是此代码还会引发相同的异常.

But this code also throws same exception.

更多信息:我设法启动了sdl.net SdlDotNetCDPlayer示例，令人惊讶的是它引发了同样的异常！尽管半年前我在笔记本电脑上工作过这些示例.

More information:I managed to launch sdl.net SdlDotNetCDPlayer example, and surprizingly it throws same exception! Though i had these examples working on my laptop half year ago.

protected override void OnResize(EventArgs e)
    {
        try
        {
            surf =
                new Surface(
                this.surfaceControl.Width,
                this.surfaceControl.Height); //exception error
            base.OnResize(e);
        }
        catch (AccessViolationException ex)
        {
            Console.WriteLine(ex.StackTrace);
        }
    }

SDL

如何在sdl.net中初始化表面变量?

问题描述

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