Calling AutoCAD Commands Programmatically

[Anonymous]

I have two short methods which are both meant to call AutoCAD's UNDO command and pass in different parameters. They are:

/// <summary>
/// Method to mark the current position of the AutoCAD program
/// </summary>
public static void MarkPosition()
{
doc.SendStringToExecute("_UNDO ", true, false, false);
doc.SendStringToExecute("_M ", true, false, false);
}

/// <summary>
/// Method to step AutoCAD back to the marked position
/// </summary>
public static void BigUndo()
{
doc.SendStringToExecute("_UNDO ", true, false, false);
doc.SendStringToExecute("_B ", true, false, false);
}

However, when I call them they do not run like I expect them to. I suspect that I am doing this completely wrong but do not know what the right approach is

[Anonymous]

I know you can't inject a command while another command in running. i.e. You can't inject the _M option until after the _UNDO command is finished.

I have seen where people have used a string builder and assemble them together but I have never been able to get it to work.

Or you could do what I did. I needed to insert Surface Texture Symbols, but was unable to inject the L (library) option so I had to recreate the entire functionality. (As an added benefit, this allowed the code to be repeatable - something the current Surface Texture object can not do (it defaults back to the default symbols))

Sorry I can't give a more direct answer, hopefully someone will see this and get some idea of what to look for.

[Anonymous]

What do you mean 'they do not run as expected'?
Are they executed at the wrong time, are they lost altogether?
And what's the purpose? Executing an UNDO and se t a Mark or just set the mark?
Have you tried just to combine the commands like "_UNDO _M "? And eventually postpone the single UNDO action if you also need to actually undo something at the same time...

[Anonymous]

I would recommend an awesome library called [AutoCAD Code Pack](https://github.com/luanshixia/AutoCADCodePack).

Using this library, you can save a lot of code you would write directly with AutoCAD .NET API. To run a command (say "re"), you just say

Interaction.Command("re");