I have presented a class entitled High Octane ObjectARX at Autodesk University the past two years. In 2006 the focus was on project organization, and last year I focused more on techniques for supporting multiple versions of AutoCAD with a single Visual Studio solution, touching briefly on testing and profiling. For 2008 I plan to focus on debugging. ...
Like that day almost 50 years ago, could today be the day that ObjectARX has died? There have been a flurry of posts (http://discussion.autodesk.com/thread.jspa?threadID=652855) in the ObjectARX discussion group about problems downloading the new ObjectARX 2009 SDK. At first I dismissed the problems as new release hiccups, and expected things to get resolved in short order. Seeing that there were no new complaints this morning, I headed over to https://www.autodesk.com/objectarx to download the new ObjectARX 2009 SDK. Instead of the new ObjectARX 2009 SDK, I received the following: ...
The Hot List Carl Bass munching on fast food in the food court, and spotted throughout the week yakking with average folks in the halls.Staggered classes reduced the lunchtime crush experienced at AU 2006.More ObjectARX programming classes this year. I’m pushing for creating a new “Developer” track for AU 2008.The Matt Murphy Head (peace be upon him).Meeting a lot of familiar faces and a few new ones!The Cold List ...
The new Visual Studio 2008 has been released, and to celebrate, I’ve updated VC Build Hook. The updated utility allows you to use the new IDE while still building with older versions of the build tools. Why is this necessary? If you build your AutoCAD 2007/2008 ObjectARX application with the Visual C/C++ 9.0 tools, AutoCAD will display a warning message about an incompatible module when you try to load it. You can use VC Build Hook to target all previous AutoCAD versions from a single Visual Studio 2008 solution (if you have the correct version of Visual C/C++ installed alongside Visual Studio 2008). In my testing so far, existing Visual Studio 2005 projects build without problems in Visual Studio 2008 when VC Build Hook is installed and the new ‘BuildToolVersion’ property is set to the correct version.
I’ve received several emails recently from users of my VC Build Hook utility that mention switching the ‘UseVC7Paths’ setting on and off depending on the build configuration they are working on. If you are doing this, you need to change your project structure! ...
With the advent of Visual Studio 2005 and automatically generated manifest files, the topic of when and how to use manifest files comes up occasionally. Since a default ObjectARX wizard generated project in Visual Studio 2005 generates an embedded manifest by default, most people don’t even think about it. Of course that was the whole idea – the manifest would ensure that the correct dependent DLLs get loaded, and voila, no need to think about it. One of my programming axioms applies in this case: TANSTAAFL. The problem is that ObjectARX applications are not in charge. AutoCAD is in charge, and it will decide which VC runtime and MFC runtime DLLs to load. If your ObjectARX application loads a different VC or MFC runtime than the ones AutoCAD is using, you’ll encounter big problems. I’ve always advised disabling the manifest completely (see my ObjectARX Tips page) to avoid such a possibility. Unfortunately, there’s a catch. The problem is that linking to the ATL80.DLL file isn’t possible by just disabling the manifest and doing nothing more. ATL is now a side-by-side (SxS) assembly, and it no longer lives on the Windows support path, so a standard un-manifested DLL won’t be able to find it. The preferred solution is to link statically to ATL (see Configuration -> General -> ‘Use of ATL’ in VS 2005 project properties) and avoid the problem altogether. If you only have one module that uses ATL, this is always the best solution. The less desirable solution is to add a manually-created manifest that specifies the desired ATL SxS assembly, but ignores the VC and MFC runtime DLLs. You’ll still need to decide whether to make ATL shared or private, and in either case you must distribute ATL with your application to ensure that it is available when your application is deployed. You can cheat, and let VS generate your manifest file (instruct it to not embed the file), then just edit the resulting .manifest file to remove references to the VC and MFC assemblies. For example, here’s one that I generated (you’ll need to generate your own to ensure that the manifest matches the version you are redistributing): <?xml version=“1.0” encoding=“UTF-8” standalone=“yes”?> <assembly xmlns=“urn:schemas-microsoft-com:asm.v1” manifestversion=“1.0”> <dependency> <dependentassembly> <assemblyidentity type=“win32” name=“Microsoft.VC80.ATL” version=“8.0.50727.762” processorarchitecture=“x86” publickeytoken=“1fc8b3b9a1e18e3b”> </assemblyidentity> </dependentassembly> </dependency> </assembly> In my work, I’ve had very little need for manifests. The VC optimizer is able to strip the unused portions of statically linked ATL out of your code, leaving a much smaller footprint than the entire assembly would require. This eliminates the need to redistribute ATL with your application, thus reducing the overall potential for deployment issues. Nevertheless, there are exceptions to every rule, and your mileage may vary.
I’ve installed Visual Studio 2005 SP1 and have been busy testing all my projects to make sure they didn’t break. Microsoft did fix at least one of the bugs I reported (the resource editor choked on resource strings that contained an embedded NULL character), but the IDE still crashes fairly consistently if I initiate a large solution build while the Intellisense database is being rebuilt. SP1 also managed to break my VCBuildHook utility, so I’ve uploaded an updated version (2.0.3.0) for use with SP1.
Finally, the long awaited service pack 1 for Visual Studio 2005 is released! The service pack has been in the pipeline since soon after Visual Studio 2005 shipped last November, with release dates slipping month after month. The latest official release date was announced as “early 2007”. Perhaps this was an intentional attempt to alleviate some of the waiting pains with a suprise release (or maybe just the Microsoft rumor mill on autopilot). Be prepared for a long install. The download page warns that it could take an hour or more to verify digital signatures before the service pack installation even begins.
If you’ve been programming with ObjectARX for a while, you already know that each version of the ObjectARX SDK only works with a specific version of Visual Studio. Mazhar Basa touches on the subject in his article Components of ObjectARX Applications (http://www.dailyautocad.com/objectarx/components-of-objectarx-applications/). My VCBuildHook utility makes it possible to build for multiple target AutoCAD versions from a single Visual Studio 2005 solution, but this utility still needs the older versions of Visual Studio to be installed on the same system in order to perform its magic. The problem is, legitimate licenses of older versions of Visual Studio are hard to come by. Back in the Visual Studio .NET 2003 days, you could purchase a new license of VS 2003, then get a free license downgrade from Microsoft that allowed you to install Visual Studio 2002 side by side on the same system. That combination allowed you to target AutoCAD versions as far back as AutoCAD 2004. Unfortunately, Microsoft stopped offering the VS 2002 downgrade license when Visual Studio 2005 began shipping in November of 2006. The end result is that new ObjectARX programmers are faced with a dilemma if they need to target anything older than AutoCAD 2007. One of the attendees at my “High-Octane ObjectARX” class at AU 2006 reminded me that MSDN (Microsoft Developer Network) members can download older versions of Visual Studio from the MSDN subscriber download center. I have verified that Visual Studio .NET 2002 (VS 2002) is available for download to MSDN Professional subscribers, but I could not find Visual Studio 6.0, which is required to target AutoCAD 2000 - 2002. Visual Studio 4.2 (required for AutoCAD R14) is available though, so maybe I’m just not looking in the right place. If you are a professional software developer, whether commercial or in-house, you should consider subscribing to MSDN for various reasons. If you’re an ObjectARX programmer and need to target older versions of AutoCAD, MSDN may be the only way to obtain the older Visual Studio build tools and libraries that you’ll need.
Some years ago I wrote a small ObjectARX module named VLXLoad that loads a .vlx file of the same name and in the same directory as the .arx module. I never claimed credit for the utility, but now that I’ve released the source code, I guess I’ll have to own up to it. ...