Edit Question - KnowledgeHub

Title Body

i'm trying to find a good way to detect if a feature exists before P/Invoking. For example calling the native StrCmpLogicalW function: [SuppressUnmanagedCodeSecurity] internal static class SafeNativeMethods { [DllImport("shlwapi.dll", CharSet = CharSet.Unicode)] public static extern int StrCmpLogicalW(string psz1, string psz2); } will crash on some systems that do not have this feature. i don't want to perform version checking , as that is bad practice, and can sometimes just be wrong (for example when functionality is back-ported, or when the functionality can be uninstalled). The correct way, is to check for the presence of the export from shlwapi.dll : private static _StrCmpLogicalW: function(String psz1, String psz2): Integer; private Boolean _StrCmpLogicalWInitialized; public int StrCmpLogicalW(String psz1, psz2) { if (!_StrCmpLogialInitialized) { _StrCmpLogicalW = GetProcedure("shlwapi.dll", "StrCmpLogicalW"); _StrCmpLogicalWInitialized = true; } if (_StrCmpLogicalW) return _StrCmpLogicalW(psz1, psz2) else return String.Compare(psz1, psz2, StringComparison.CurrentCultureIgnoreCase); } The problem, of course, is that C# doesn't support function pointers, i.e.: _StrCmpLogicalW = GetProcedure("shlwapi.dll", "StrCmpLogicalW"); cannot be done. So i'm trying to find alternative syntax to perform the same logic in .NET. i have the following pseudo-code so far, but i'm getting stymied: [SuppressUnmanagedCodeSecurity] internal static class SafeNativeMethods { private Boolean IsSupported = false; private Boolean IsIniti

Tags (comma-separated) Cancel