How to close a file in Autocad using C# keeping acad.exe running?

Question

I am using visual studio 2010 and I am having a .DWG file which I want to open in autocad. Till now I have used this.

Process p = new Process();
ProcessStart         


        

Answer 1

AutoCAD does have an api. there are 4 assemblys. Two for in-process and two for COM.

inprocess : acdbmgd.dll acmgd.dll

COMInterop : Autodesk.Autocad.Interop.dll Autodesk.Autocad.Interop.Common.dll

this is a method that will open a new instance of AutoCAD or it will connect to an existing running instance of AutoCAD.

you will need to load these .dlls into your project references.

using Autodesk.AutoCAD.Interop;
using Autodesk.AutoCAD.Interop.Common;

namespace YourNameSpace {

public class YourClass {

AcadApplication AcApp;
private const string progID = "AutoCAD.Application.18.2";// this is AutoCAD 2012 program id
private string profileName = "<>";
private const string acadPath = @"C:\Program Files\Autodesk\AutoCAD 2012 - English\acad.exe";

public void GetAcApp()
    {
        try
        {
            AcApp = (AcadApplication)Marshal.GetActiveObject(progID);

        } catch {
            try {
                var acadProcess = new Process();
                acadProcess.StartInfo.Arguments = string.Format("/nologo /p \"{0}\"", profileName);
                acadProcess.StartInfo.FileName = (@acadPath);
                acadProcess.Start();
                while(AcApp == null)
                {
                    try { AcApp = (AcadApplication)Marshal.GetActiveObject(progID); }
                    catch { }
                }
            } catch(COMException) {
                MessageBox.Show(String.Format("Cannot create object of type \"{0}\"",progID));
            }
        }
        try {
            int i = 0;
            var appState = AcApp.GetAcadState();
            while (!appState.IsQuiescent)
            {
                if(i == 120)
                {
                    Application.Exit();
                }
                // Wait .25s
                Thread.Sleep(250);
                i++;
            }
            if(AcApp != null){
                // set visibility
                AcApp.Visible = true;
            }
        } catch (COMException err) {
            if(err.ErrorCode.ToString() == "-2147417846"){
                Thread.Sleep(5000);
            }
        }
    }
    }
}

closeing it is as simple as

Application.Exit();

and forgive the code. its atrocious, this was one of my first methods when i just started developing...