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.NET Forum / .NET Framework / Interop / February 2007Dynamic DllImport
Hey folks, I'm trying to DllImport the SendMessage and SetWindowTheme APIs, but maintain backward compatibility with Win2k and stay cross-platform with Mono. So I need a way to import these APIs if they are there but fail gracefully if they aren't. Any ideas? >I'm trying to DllImport the SendMessage and SetWindowTheme APIs, but >maintain backward compatibility with Win2k and stay cross-platform >with Mono. So I need a way to import these APIs if they are there but >fail gracefully if they aren't. Any ideas? Use System.Environment.OSVersion to check which OS you're running on. SendMessage should be available on any Windows client OS that .NET apps run on. SetWindowTheme is available in Windows XP (i.e. version 5.1) and later. Mattias  SignatureMattias Sjögren [C# MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com Please reply only to the newsgroup. On Feb 24, 8:07 am, Mattias Sjögren <mattias.dont.want.s...@mvps.org> wrote: > >I'm trying to DllImport the SendMessage and SetWindowTheme APIs, but > >maintain backward compatibility with Win2k and stay cross-platform [quoted text clipped - 10 lines] > > Mattias That doesn't help. I need to support Win2K, but use SetWindowTheme when available. I also need to support Mono, but use SendMessage when it is available. Preferably without resorting to compiling different versions of the assembly. The problem with using DllImport is that it causes the assembly to fail loading if it can't find the .dll or export. >The problem with using DllImport is that it causes the assembly to >fail loading if it can't find the .dll or export. That's not what I'm seeing. DllImports are resolved the first time they are called. If you never call a function, it doesn't matter if it exists or not. At least that's the behavior of the CLR, I don't know if Mono behaves in a different way. Mattias SignatureMattias Sjögren [C# MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com Please reply only to the newsgroup.
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