public static void UnloadAllPreloadedLibraries()
{
foreach (var(_, handle) in PreloadedLibraryHandles)
{
NativeMethods.FreeLibrary(handle);
}
PreloadedLibraryHandles.Clear();
}
/// <summary>
/// Preloads a dynamic library file (.dll) into the memory space of current process.
/// According to the file target architecture, it should be placed at lib/x86 or lib/x64 under current working directory.
/// </summary>
/// <param name="libraryFileName">The file name of this library, including file extension.</param>
/// <returns><see langword="true"/> if it is successfully preloaded; otherwise, <see langword="false"/>.</returns>
public static bool PreloadLibrary(string libraryFileName)
{
var path = Environment.CurrentDirectory;
var ptrSize = Marshal.SizeOf(typeof(IntPtr));
string childDirName;
switch (ptrSize)
{
case 4:
childDirName = ChildDirectory32;
break;
case 8:
childDirName = ChildDirectory64;
break;
default:
throw new PlatformNotSupportedException($"An OS whose pointer size is {ptrSize} is not supported right now.");
}
path = Path.Combine(path, BaseDirectory, childDirName, libraryFileName);
string key;
if (Environment.OSVersion.Platform == PlatformID.Win32NT)
{
key = path.ToLowerInvariant();
}
else
{
key = path;
}
if (PreloadedLibraryHandles.ContainsKey(key))
{
return(true);
}
var handle = NativeMethods.LoadLibrary(path);
var successful = handle != IntPtr.Zero;
if (successful)
{
PreloadedLibraryHandles.Add(key, handle);
}
return(successful);
}
