.NET

[#1]

I am using a dllimport from accore.dll, but the entry point for the method in the dll differs between 32-bit and 64-bit version of AutoCAD. How can I check whether the AutoCAD application is a 32- or 64-bit version, i.e. the dll is 32- or 64-bit?

[#2]

public static bool IsX64()
{
   if (IntPtr.Size == 4) return false;
             else        return true;
}

 Sample of using: http://forums.autodesk.com/t5/NET/Can-t-find-ModelessOperationWill-Start-Event-in-Dot-net/m-p/344769...

Other example: http://forums.autodesk.com/t5/NET/Save-a-password-protected-drawing-without-password-with-VB-NET/m-p...

[#3 · Accepted solution]

Hi Alexander,

public static bool IsX64()
{
   return IntPtr.Size == 8;
}

is less verbose and quite self explanatory.

[#4]

---

_gile wrote:
is less verbose and quite self explanatory.

---

Totally agree!

[#5]

Hi

I didn't know about the IntPtr.size, so thank you for that information. But in my case I can't use this since I can't get IntPtr.size directly in a class where the dllimport is happening. You have to be whithin a method to use it.

Instead I used conditional compilation symbols and I compile one dll for 32-bit and one for 64-bit. By using the conditional compilation symbols the correct part of the code is compiled for each build. 

[#6]

---

Fredrik.Larsen wrote:
But in my case I can't use this since I can't get IntPtr.size directly in a class where the dllimport is happening. You have to be whithin a method to use it.

---

Why? Did you watch the examples to which I referred?

[#7]

Yes, you're right. That might be easier leaving everything in one dll. 

[#8 · Accepted solution]

Sample that demonstrate common source code for different AutoCAD version and Platform (32 or 64 bit):

using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using AcAp = Autodesk.AutoCAD.ApplicationServices;

[assembly: CommandClass(typeof(Rivilis.HookESC))]

namespace Rivilis
{
  public static class HookESC
  {
    static int AcadVer = AcAp.Application.Version.Major;
    // For AutoCAD 2007 - 2012 64 bit
    [DllImport("acad.exe", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl, 
      EntryPoint = "?acedRegisterFilterWinMsg@@YAHQ6AHPEAUtagMSG@@@Z@Z")]
    private static extern int acedRegisterFilterWinMsg2012x64(WindowHookProc callBackFunc);
    [DllImport("acad.exe", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl, 
      EntryPoint = "?acedRemoveFilterWinMsg@@YAHQ6AHPEAUtagMSG@@@Z@Z")]
    private static extern int acedRemoveFilterWinMsg2012x64(WindowHookProc callBackFunc);
    // For AutoCAD 2007 - 2012 32 bit
    [DllImport("acad.exe", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl, 
      EntryPoint = "?acedRegisterFilterWinMsg@@YAHQ6AHPAUtagMSG@@@Z@Z")]
    private static extern int acedRegisterFilterWinMsg2012x32(WindowHookProc callBackFunc);
    [DllImport("acad.exe", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl, 
      EntryPoint = "?acedRemoveFilterWinMsg@@YAHQ6AHPAUtagMSG@@@Z@Z")]
    private static extern int acedRemoveFilterWinMsg2012x32(WindowHookProc callBackFunc);
    // For AutoCAD 2013 64 bit
    [DllImport("accore.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl, 
      EntryPoint = "?acedRegisterFilterWinMsg@@YAHQ6AHPEAUtagMSG@@@Z@Z")]
    private static extern int acedRegisterFilterWinMsg2013x64(WindowHookProc callBackFunc);
    [DllImport("accore.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl, 
      EntryPoint = "?acedRemoveFilterWinMsg@@YAHQ6AHPEAUtagMSG@@@Z@Z")]
    private static extern int acedRemoveFilterWinMsg2013x64(WindowHookProc callBackFunc);
    // For AutoCAD 2013 32 bit
    [DllImport("accore.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl, 
      EntryPoint = "?acedRegisterFilterWinMsg@@YAHQ6AHPAUtagMSG@@@Z@Z")]
    private static extern int acedRegisterFilterWinMsg2013x32(WindowHookProc callBackFunc);
    [DllImport("accore.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl, 
      EntryPoint = "?acedRemoveFilterWinMsg@@YAHQ6AHPAUtagMSG@@@Z@Z")]
    private static extern int acedRemoveFilterWinMsg2013x32(WindowHookProc callBackFunc);

    private static int acedRegisterFilterWinMsg(WindowHookProc callBackFunc)
    {
      if (AcadVer >= 19) {
        if (IntPtr.Size == 4) return acedRegisterFilterWinMsg2013x32(callBackFunc); 
                  else        return acedRegisterFilterWinMsg2013x64(callBackFunc);
      } else {
        if (IntPtr.Size == 4) return acedRegisterFilterWinMsg2012x32(callBackFunc);
                  else        return acedRegisterFilterWinMsg2012x64(callBackFunc);
      }
    }
    private static int acedRemoveFilterWinMsg(WindowHookProc callBackFunc)
    {
      if (AcadVer >= 19) {
        if (IntPtr.Size == 4) return acedRemoveFilterWinMsg2013x32(callBackFunc);
                 else         return acedRemoveFilterWinMsg2013x64(callBackFunc);
      }
      else {
        if (IntPtr.Size == 4) return acedRemoveFilterWinMsg2012x32(callBackFunc);
                 else         return acedRemoveFilterWinMsg2012x64(callBackFunc);
      }
    }

    // hook message filter callback function
    [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
    public delegate int WindowHookProc(ref Message msg);
    private static WindowHookProc callBackFunc = null;

    private static int WindowsHook(ref Message msg)
    {
      if (msg.Msg == 0x0100 && msg.WParam == (IntPtr)0x1b) {
        // MessageBox.Show("ESC pressed"); // <- your's action
        // acedRemoveFilterWinMsg(callBackFunc); // <- unregister callback
      }
      return 0;
    }

    [CommandMethod("SetHookEsc")]
    public static void SetHookEsc()
    {
      callBackFunc = new WindowHookProc(WindowsHook);
      acedRegisterFilterWinMsg(callBackFunc);
    }
    [CommandMethod("UnsetHookEsc")]
    public static void UnsetHookEsc()
    {
      if (callBackFunc != null) acedRemoveFilterWinMsg(callBackFunc);
    }
  }
}