C# Signature:

    [DllImport("WINSCARD.DLL")]
    internal static extern uint SCardGetStatusChange(IntPtr hContext, UInt32 dwTimeout, [In, Out] SCARD_READERSTATE[] rgReaderStates, UInt32 cReaders);

VB Signature:

Declare Function WinSCard Lib "winscard.dll" (TODO) As TODO

User-Defined Types:

  [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
    internal struct SCARD_READERSTATE
    {
    /// <summary>
    /// Reader
    /// </summary>
    internal string szReader;
    /// <summary>
    /// User Data
    /// </summary>
    internal IntPtr pvUserData;
    /// <summary>
    /// Current State
    /// </summary>
    internal UInt32 dwCurrentState;
    /// <summary>
    /// Event State/ New State
    /// </summary>
    internal UInt32 dwEventState;
    /// <summary>
    /// ATR Length
    /// </summary>
    internal UInt32 cbAtr;
    /// <summary>
    /// Card ATR
    /// </summary>
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]
    internal byte[] rgbAtr;
    }

    And

    internal enum SCardState
    {
    /// <summary>
    /// Unware
    /// </summary>
    UNAWARE = 0x00000000,
    /// <summary>
    /// State Ignored
    /// </summary>
    IGNORE = 0x00000001,
    /// <summary>
    /// State changed
    /// </summary>
    CHANGED = 0x00000002,
    /// <summary>
    /// State Unknown
    /// </summary>
    UNKNOWN = 0x00000004,
    /// <summary>
    /// State Unavilable
    /// </summary>
    UNAVAILABLE = 0x00000008,
    /// <summary>
    /// State empty
    /// </summary>
    EMPTY = 0x00000010,
    /// <summary>
    /// Card Present
    /// </summary>
    PRESENT = 0x00000020,
    /// <summary>
    /// ATR mathched
    /// </summary>
    ATRMATCH = 0x00000040,
    /// <summary>
    /// In exclusive use
    /// </summary>
    EXCLUSIVE = 0x00000080,
    /// <summary>
    /// In use
    /// </summary>
    INUSE = 0x00000100,
    /// <summary>
    /// Mute State
    /// </summary>
    MUTE = 0x00000200,
    /// <summary>
    /// Card unpowered
    /// </summary>
    UNPOWERED = 0x00000400
    }    

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

UInt32 nbReaders = 1;

SCARD_READERSTATE[] readerState = new SCARD_READERSTATE[nbReaders];

readerState[0].szReader = "Reader X";

readerState[0].dwCurrentState = (UInt32)SCardState.UNAWARE;

errorCode = SCardGetStatusChange(hContext, 0, readerState, nbReaders);

Alternative Managed API:

Do you know one? Please contribute it!