Autocad 2015 Vba Module | 64-bit

In 32-bit VBA, memory addresses and handles (like hWnd or object pointers) fit into a 32-bit integer (Long). In 64-bit VBA, these addresses require 64 bits. Microsoft introduced two new data types:

AutoCAD 2015 is natively compiled for 64-bit architectures. This allows the application to access significantly more system memory (RAM) than its 32-bit predecessors. However, VBA was originally designed as a 32-bit, in-process automation server.

In a 64-bit environment, a 32-bit DLL cannot be loaded into a 64-bit process space. Therefore, the VBA module for AutoCAD 2015 64-bit utilizes a "side-by-side" (out-of-process) architecture. Unlike the legacy in-process integration where VBA ran directly inside AutoCAD's memory space, the modern VBA module acts as an interoperability layer, facilitating communication between the 64-bit AutoCAD instance and the VBA runtime.

Sub DrawCircleInModelSpace()
    Dim acadApp As Object
    Dim acadDoc As Object
    Dim centerPoint(2) As Double
    Dim radius As Double
Set acadApp = GetObject(, "AutoCAD.Application")
Set acadDoc = acadApp.ActiveDocument
centerPoint(0) = 0#: centerPoint(1) = 0#: centerPoint(2) = 0#
radius = 5#
acadDoc.ModelSpace.AddCircle centerPoint, radius
acadDoc.Regen (True)

End Sub

This works identically in 32-bit and 64-bit AutoCAD 2015 because it uses AutoCAD’s object model, not Windows API.

Before diving into the 64-bit module, you must understand Autodesk’s rationale. VBA relies heavily on ActiveX and COM interfaces. As Autodesk moved towards a more secure, multi-threaded, and 64-bit native environment, embedding VBA became a liability. Old 32-bit VBA code could cause memory access violations and crashes in a 64-bit host process. autocad 2015 vba module 64-bit

Consequently, starting with AutoCAD 2010, Autodesk made VBA a separate, optional download. AutoCAD 2015 continues this tradition. The 64-bit version of AutoCAD 2015 requires a specifically compiled 64-bit VBA module (often referred to as the "VBA Enabler") to interact with the 64-bit acad.exe process.

Without this module, menus like "Tools → Macros → VBA Manager" will be grayed out or missing entirely.

The most critical aspect of using the VBA module in a 64-bit environment is code migration. Code written for 32-bit AutoCAD will often fail in the 2015 64-bit environment due to memory addressing. In 32-bit VBA, memory addresses and handles (like

In 64-bit AutoCAD, all API declarations must use PtrSafe and pointer types.

Autodesk provides the VBA module as a free add-on. However, finding the correct version is critical. Using a VBA enabler from AutoCAD 2013 or 2014 may lead to instability or failure to load.