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It would be nice if either COM or .NET were to produce a more informative error, such as The component you require is available only in 32-bit form, but you re running as a 64-bit process. This would involve performing extra work on an operation that s already doomed, just to tell you something you can work out for yourself. This would be a waste of CPU cycles, which is presumably why .NET doesn t do this. With normal DLLs, the same issue exists, although you ll get a slightly different exception: BadImageFormatException. (The word image is sometimes used to refer to a compiled binary component designed to be loaded into a process and executed.) This can be rather alarming, because if you read the error message in the exception, or you take a glance at the exception s documentation, it s easy to get the impression that the DLL you are trying to load is corrupt. But what s really going on here is that it s simply in a format that cannot be loaded into your process you re in a 64-bit process and you re trying to load a 32-bit DLL.

To avoid these problems, Visual Studio automatically configures WPF and Windows Forms projects to run in 32-bit mode. If you open the project properties and go to the Build tab, you ll see a Platform target: setting, and for GUI projects, this defaults to x86, as Figure 19-6 shows. This makes the application always run as a 32-bit process, even on 64-bit Windows. This is unlikely to cause problems for most user interfaces it s pretty unusual for a GUI to process such large volumes of data that 64-bit processing becomes a necessity. GUI programs are more likely to use ActiveX controls than to have massive memory requirements, so this conservative default makes sense. (And if you re writing an unusual application that really does need a multigigabyte address space, you can always change this project setting.)

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Things can get slightly trickier with class libraries. Visual Studio sets the platform target to Any CPU for library projects. The platform target setting has a slightly different significance for libraries, because a library doesn t get to decide the bitness of its process. The 32/64 decision is made when the process starts up, so it s the platform target of the .exe file that matters; by the time a library loads, it s too late to change. So Any CPU makes more sense libraries tend to need to be more flexible. However, if you write a library that uses interop, you may want to change this setting. If your library depends on unmanaged code that is available only in 32-bit form, it will not be able to run usefully in a 64-bit process, and you should advertise that fact by changing the library s platform target to x86. Your DLL will then refuse to load in a 64-bit process, which may seem annoying, but it would be much more annoying if it loaded happily, only to fail later on at runtime. Better for the component to make it perfectly clear up front that it needs a 32-bit process. There s often nothing stopping unmanaged component authors producing both 32-bit and 64-bit versions of their code, by the way. It makes building, deploying, testing, and supporting the component more complicated, but it s absolutely possible. Bitness is an issue for .NET only because in practice, most unmanaged components that are out there today are 32-bit only. (So while component authors could have provided 64-bit versions, they mostly haven t.) If the unmanaged code you depend on is available in all forms, you re free to set your platform target to Any CPU.

You may well find that some components are available in 64-bit mode for x64 systems, but not Itanium systems. So your platform target would, in effect, be x86 or x64, but not Itanium. Unfortunately, there s no such setting, so in practice, you d probably choose Any CPU so that it works on x86 and x64. Itanium systems will see a runtime error, but system administrators can force a process to run as 32-bit to work around this. In April 2010, Microsoft announced that future versions of Windows and Visual Studio will not support the Itanium, so this particular interop issue looks likely to go away in the long run.

If the DLLs you re using through interop are part of the Win32 API, you will usually be free to run in either 32-bit or 64-bit mode, because Windows presents its API in both flavors. So let s see how to use DLLs such as those that make up the Win32 API.

COM components aren t the only kind of unmanaged code you might need to work with. For example, you may sometimes want to call a Win32 API. With each new version of .NET, there has been less need to do this, because the framework class libraries provide .NET-friendly wrappers for more and more of the underlying services, but there are still a few places where it s useful to use a Win32 API directly. We do this in C# using a feature called P/Invoke.

The P is short for Platform, because this facility was originally intended only to provide access to the underlying platform API. In fact, you can use it to call functions in any DLL it s not limited to DLLs that are part of the Win32 API.

1. A user s home directory is the location on a file system where her files are stored. 2. An entity (or a process) that is capable of being authenticated is often referred to as a principal. 3. A backup operator is responsible for backing up all user files on a periodic basis.

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