http://www.opendwg.org/

DRX SDK

The DRX SDK allows users to create extensions for DWGdirect-based applications. DRX applications can access the data in a DWG/DXF drawing file, add custom commands to the global DWGdirect command stack, and create custom objects and entities. The SDK can be used to create DRX modules only, not stand-alone applications. DRX modules are Microsoft® Windows® DLLs which can be loaded at runtime by a compatible DWGdirect host application.

可以用這個平台來設計自己的動态連結庫

OpenDWG® Specification

The ODA specification for the OpenDWG file format provides the complete results of investigations of the DWG file format. Included are specifications for the header, entities, table entries (including layers, linetypes, views, viewports, styles, UCSs, dimension styles, and registered applications), objects, raster images, object maps, and bookkeeping information. The OpenDWG specification is in rich text format.

由ODA提供的OpenDWG檔案格式詳細說明。

Utilities

Open Design Alliance and its members have created the following free utilities, based on the OpenDWG Libraries, for unrestricted, non-commercial use. Please note that inclusion of any utility in a commercial product does require commercial licensing, unless otherwise stated in the product description. ODA members are encouraged to create and share their own utilities with the CAD community.

DWGViewer.exe

Free DWG Viewer, from Informative Graphics Corporation. The Free DWG Viewer is powered by Brava!® using DWGdirect™ and supports the viewing of DWG, DXF, DWF and CSF formats as a Microsoft® Windows desktop program and web page ActiveX component.

EveryDWG.zip – "EveryDWG File Converter"

Windows application that converts files back and forth between DWG and DXF formats. The current version is based on DWGdirect 2.7.1, and now supports wildcards for input file specification (allowing DXF files to be used as input).

DSNIFF.zip – "DWG Sniffer"

Tests DWG files for possible corruption. Scans DWG files in Release 11-15 formats and verifies the error checking information contained within them. Files that fail this test are reported as corrupt. Accepts wildcard filenames and will optionally check subdirectories recursively.

DUMPA.zip

Performs a binary dump of an R12 or prior DWG file.

DUMP13.zip

Performs a binary dump of an R13/R14 DWG file.

以上是一些機遇OpenDWG 庫的應用。

Preview of Member Downloads

The following files are available to ODA members after logging in to the ODA Member Area:

DWGdirect™

DWGdirect supports a wide range of database operations, contains read/write support for DWG/DXF files, and contains rendering support. DWGdirect is available for the following platforms:

Windows (32-bit)	SGI	Solaris
Windows (64-bit)	Macintosh	HP
Windows CE	Linux X86	IBM AIX

DWGdirectX

DWGdirectX is an ActiveX control driven by DWGdirect. The download package includes samples for using DWGdirectX in both Visual Basic and Delphi.

NEW! DWGdirect.NET

DWGdirect.NET is a managed .NET component which makes DWGdirect technology available to .NET programmers. DWGdirect.NET can be used on Windows XP and Windows Vista.  An alpha release of DWGdirect.NET is scheduled for early 2009.

ADTdirect

ADTdirect is a library collection that allows you to display, create, modify and render ADT custom objects.

C3Ddirect

C3Ddirect is a library collection that allows you to display and render C3D custom objects. Future versions are being developed to create and modify C3D objects.

DGNdirect™

The DGNdirect libraries provide the ability to create programs that read and use the data contained in a Bentley Systems MicroStation® V8 DGN file. The current beta version will also load most V7 files. DGNdirect uses the OpenDGN specification from Bentley Systems.

OpenDWG® Toolkit Libraries (Legacy)

OpenDWG Toolkit enables you to write C or C++ language programs that read and write DWG and DXF files outside of Autodesk® AutoCAD® , thus greatly improving the speed and convenience of processes utilizing information contained within DWG files. The following platforms are supported:

DEC Alpha NT	IBM RS/6000 AIX	Sun Solaris 1
DEC Alpha VMS	Linux	Sun Solaris 2
DEC Alpha Unix	Macintosh	Microsoft Windows
HP 700 Series, HP/UX	Silicon Graphics

OpenDWG® Viewkit Libraries (Legacy)

OpenDWG Viewkit is a general purpose vectorizer for DWG and DXF files that runs on top of OpenDWG Toolkit, our read/write product, and provides functions that break a DWG file into the vectors and filled regions which compose its visual representation. The following platforms are supported:

DEC Alpha NT	IBM RS/6000 AIX	Sun Solaris 1
DEC Alpha VMS	Linux	Sun Solaris 2
DEC Alpha Unix	Silicon Graphics	Microsoft Windows
HP 700 Series, HP/UX

聯盟的會員可以享受到的服務。

解釋ODA

About the ODA

The Open Design Alliance, formerly OpenDWG® Alliance, was formed in February 1998 to promote OpenDWG as an open standard for the exchange of CAD drawing data. Two major forces contributed to the creation of the ODA:

• The rise of the Internet and the ease of transmitting all types of data, including CAD data, made interoperability even more important than before. Anyone from a one-person shop to a large corporation could use the Internet or corporate Intranets to transmit, view, print, and plot drawing files, or to query those files for information.
• The number of DWG files containing valuable CAD data was continuing to grow, yet the valuable data stored in DWG files was kept in a format that was not accessible to end-users nor to programs that might extract data from the files, display them, or perform other useful functions.

In early 1998, Visio Corporation (now part of Microsoft® Corporation) acquired MarComp as part of an overall plan to help make the DWG file format an open standard. Visio Corporation then joined with the other ODA Founding Members to create OpenDWG Alliance, and donated the source code and programming libraries produced by MarComp to the OpenDWG Alliance for its non-exclusive use in promoting the DWG file format as an open standard. In May 2003, the OpenDWG Alliance signed an agreement with Bentley Systems to support their OpenDGN standard. In October 2003, the OpenDWG Alliance changed its name to Open Design Alliance, in recognition of its expanded mission.

ODA——Open Design Alliance，前身是OpenDWG® Alliance。是一個提供CAD資料格式公開标準的非營利性聯盟。

DRX是什麼意思

DRX ——DWGdirect Runtime eXtension是對DWGdirect的擴充

什麼是DWGdirect

DWGdirect 

DWGdirect is a development environment for creating custom CAD and technical graphics applications using C++.  It includes full support for the DWG and DXF file formats, a powerful object-oriented C++ API, and a rich feature set for editing, manipulating and rendering CAD data. DWGdirect includes support for DRX (DWGdirect Runtime eXtension) component technology, which can be used to build modular components that support custom objects and custom commands. 

DWGdirect是一個用C++開發的，用來建立通用CAD和圖形應用程式的平台。其充分支援DWG和DXF格式，提供強大的C++ API，并且提供豐富的可編輯，處理和表現CAD資料的特色集合。