Télécharger la source du .NET depuis ReferenceSource et rechercher dans tous les fichiers UnsafeNativeMethods.cs ou dans le fichier win32native.cs. Il y a presque tous les API Windows.

Ne pas utiliser IntPtr mais HandleRef pour les paramètres de type HWND selon la MSDN.

IntPtr iptr = ...;
HandleRef href = new HandleRef(null, iptr);

IntPtr, SafeHandle and HandleRef - Explained Archive du 08/02/2009 le 28/04/2020

SafeHandle and HandleRef Archive du 07/12/2014 le 28/04/2020

Utiliser string à la place en spécifiant le Marshal pour chaque paramètre.

public static extern IntPtr FindWindowA([MarshalAs(UnmanagedType.LPStr)] string className, [MarshalAs(UnmanagedType.LPStr)] string windowName);

Il est aussi possible de mettre directement DllImport(CharSet = CharSet.Ansi) ou CharSet.Unicode mais l'analyseur statique de Visual Studio préfère l'utilisation de MarshalAs.

Si CharSet.Ansi est utilisé, il est préférable de rajouter DllImport(BestFitMapping = false, ThrowOnUnmappableChar = true).

Ne marche qu'à partir de Windows Vista.

Get drive label in C# Archive du 16/05/2010 le 28/04/2020

    public const string SHELL = "shell32.dll";
 
    [DllImport(SHELL, CharSet = CharSet.Unicode)]
    public static extern uint SHParseDisplayName(string pszName, IntPtr zero, [Out] out IntPtr ppidl, uint sfgaoIn, [Out] out uint psfgaoOut);
 
    [DllImport(SHELL, CharSet = CharSet.Unicode)]
    public static extern uint SHGetNameFromIDList(IntPtr pidl, SIGDN sigdnName, [Out] out String ppszName);
 
    public enum SIGDN : uint
    {
        NORMALDISPLAY = 0x00000000,
        PARENTRELATIVEPARSING = 0x80018001,
        DESKTOPABSOLUTEPARSING = 0x80028000,
        PARENTRELATIVEEDITING = 0x80031001,
        DESKTOPABSOLUTEEDITING = 0x8004c000,
        FILESYSPATH = 0x80058000,
        URL = 0x80068000,
        PARENTRELATIVEFORADDRESSBAR = 0x8007c001,
        PARENTRELATIVE = 0x80080001
    }
 
    //var x = GetDriveLabel(@"C:\")
    public string GetDriveLabel(string driveNameAsLetterColonBackslash)
    {
        IntPtr pidl;
        uint dummy;
        string name;
        if (SHParseDisplayName(driveNameAsLetterColonBackslash, IntPtr.Zero, out pidl, 0, out dummy) == 0
            && SHGetNameFromIDList(pidl, SIGDN.PARENTRELATIVEEDITING, out name) == 0
            && name != null)
        {
            return name;
        }
        return null;
    }

OperatingSystem osVersionObj = Environment.OSVersion; 
 
OSVersionInfo osVersionInfo = new OSVersionInfo() 
{ 
    Name = GetOSName(osVersionObj), 
    Major = osVersionObj.Version.Major, 
    Minor = osVersionObj.Version.Minor, 
    Build = osVersionObj.Version.Build 
}; 

Correspondance :

Operating System Version Archive du 31/05/2018 le 28/04/2020

CCS LABS C#: Low Level Disk Access Archive

Single Process Instance Object Archive du 09/10/2002 le 28/04/2020 Dans Program.cs :

[DllImport("user32.dll")]
private static extern bool SetForegroundWindow(IntPtr hWnd);
[DllImport("user32.dll")]
private static extern bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);
[DllImport("user32.dll")]
private static extern bool IsIconic(IntPtr hWnd);
 
private const int SW_RESTORE = 9;
 
public static void RaiseOtherProcess()
{
  Process proc = Process.GetCurrentProcess();
  // Using Process.ProcessName does not function properly when
  // the actual name exceeds 15 characters. Using the assembly 
  // name takes care of this quirk and is more accruate than 
  // other work arounds.
  string assemblyName = Assembly.GetExecutingAssembly().GetName().Name;
  foreach (Process otherProc in Process.GetProcessesByName(assemblyName))
  {
    //ignore "this" process
    if (proc.Id != otherProc.Id)
    {
      // Found a "same named process".
      // Assume it is the one we want brought to the foreground.
      // Use the Win32 API to bring it to the foreground.
      IntPtr hWnd = otherProc.MainWindowHandle;
      if (IsIconic(hWnd))
      {
        ShowWindowAsync(hWnd, SW_RESTORE);
      }
      SetForegroundWindow(hWnd);
      break;
    }
  }
}
 
static void Main()
{
  bool _owned;
  Mutex _processSync = new Mutex(true, Assembly.GetExecutingAssembly().GetName().Name + "RDVision", out _owned);
 
  if (!_owned)
  {
    RaiseOtherProcess();
    return;
  }
 
  // La suite.