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Dealing With Native DLLs in .NET “AnyCPU” Builds
13 February 11 09:27 PM | pavely | 2 comment(s)

A .NET application can be compiled using the “AnyCPU” configuration, meaning the application runs as 32 bit on a 32 bit OS, and 64 on a 64 bit OS. As long as the application is purely managed, everything should be just fine. However, if the application must use some native DLL through interop (e.g. P/Invoke), then “AnyCPU” may be an issue. A native DLL cannot be both 32 and 64 bit – it’s one or the other. The traditional solution to the problem is to switch the .NET build to a “Win32” or “x64” configuration...

תגים:.NET, Interop, DEV, Internals, 64 bit, Native API, .NET 4

Multiple Instance Windows Media Player
23 September 09 12:21 PM | pavely | 1 comment(s)

When Windows media player (WMP) is open, any attempt to open it again simply reactivates the existing WMP window. WMP is running as a single instance. It uses a relatively well known methods for this, creating a named mutex on startup and seeing if it already exists (by calling GetLastError and comparing with ERROR_ALREADY_EXISTS ). WMP uses a mutex called "Microsoft_WMP_70_CheckForOtherInstanceMutex" and this name seems to be consistent between WMP versions (at least starting from Windows...

תגים:C++, DEV, Win32, Internals, Native API, Windows Media Player