public ushort wMid;

        public ushort wMid;

static extern uint midiOutShortMsg(IntPtr hMidiOut, uint dwMsg);

Declare Function midiOutShortMsg Lib "winmm.dll" (hMidiOut As Intptr,dwMsg As UInt32) As UInt32

     //public uint dwMinimum; // Unioned with lMinimum

     //public uint dwMaximum; // Unioned with lMaximum

     Public wMid As Short

     public short wMid;

         MsgBox("MID = " & wc.wMid & Chr(13) & "PID = " & wc.wPid & Chr(13) & "Version = " & _

        public short wMid;

        return string.Format("wMid:{0}|wPid:{1}|vDriverVersion:{2}|'szPname:{3}'|dwFormats:{4}|wChannels:{5}|wReserved:{6}|dwSupport:{7}", new object[] { wMid, wPid, vDriverVersion, szPname, dwFormats, wChannels, wReserved, dwSupport });

        public short wMid;

        return string.Format("wMid:{0}|wPid:{1}|vDriverVersion:{2}|'szPname:{3}'|dwFormats:{4}|wChannels:{5}|wReserved:{6}", new object[] { wMid, wPid, vDriverVersion, szPname, dwFormats, wChannels, wReserved });

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static extern TwRC DSMparent( [In, Out] TwIdentity origin, IntPtr zeroptr, TwDG dg, TwDAT dat, TwMSG msg, ref IntPtr refptr );

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    /// Use the EmfToWmfBits function in the GDI+ specification to convert a

static extern IntPtr GdipEmfToWmfBits(HandleRef hEmf, uint uBufferSize,

    byte[] bBuffer, int iMappingMode, EmfToWmfBitsFlags flags);

private declare function GdipEmfToWmfBits lib "gdiplus.dll"(ByVal hEmf as IntPtr, _

    ByVal flags as EmfToWmfBitsFlags) as UInteger

          int dwMimeFlags,

VB.NET dwMimeFlags: (http://msdn.microsoft.com/en-us/library/ie/ms775107(v=vs.85).aspx)

        ByVal dwMimeFlags As Integer, _

        dwMimeFlags As Long, _

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An application sends the WM_MDIICONARRANGE message to the multiple-document interface (MDI) client window to prompt the client window to arrange its minimized MDI child windows.

static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, WM wParam, [In]KBDLLHOOKSTRUCT lParam);

static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, WM wParam, [In]MSLLHOOKSTRUCT lParam);

static extern TODO ChangeWindowMessageFilter（USER32）(TODO);

Declare Function ChangeWindowMessageFilter（USER32） Lib "user32.dll" (TODO) As TODO

public static extern bool ChangeWindowMessageFilterEx(IntPtr hWnd, uint msg, ChangeWindowMessageFilterExAction action,ref CHANGEFILTERSTRUCT changeInfo);

Private Shared Function ChangeWindowMessageFilterEx(hWnd As IntPtr, msg As UInteger, action As ChangeWindowMessageFilterExAction, ByRef changeInfo As CHANGEFILTERSTRUCT) As <MarshalAs(UnmanagedType.Bool)> Boolean

    public enum ChangeWindowMessageFilterExAction : uint

    Private Enum ChangeWindowMessageFilterExAction As UInteger

    Private Enum ChangeWindowMessageFilterFlags As UInteger

ChangeWindowMessageFilterEx(Handle,_message,ChangeWindowMessageFilterExAction.Allow, IntPtr.Zero);

        ChangeWindowMessageFilterEx(Handle,_message,ChangeWindowMessageFilterExAction.Allow, ref filterStatus);

Windows allows only one caret per message queue. To add a caret to a control, handle the WM_SETFOCUS message, or the GotFocus event, or override OnGotFocus if you're writing a custom control, and call CreateCaret from the message or event handler. You should also handle WM_KILLFOCUS, LostFocus or OnLostFocus and call DestroyCaret. You will also need to call ShowCaret to make the caret visible, and SetCaretPos to set its position.

    public const uint WM_DRAWITEM = 0x002b;

    public const uint WM_MEASUREITEM = 0x002c;

/// <param name="hInstance">Handle to the instance of the module to be associated with the window.</param> <param name="lpParam">Pointer to a value to be passed to the window through the CREATESTRUCT structure (lpCreateParams member) pointed to by the lParam param of the WM_CREATE message. This message is sent to the created window by this function before it returns.

/// <item>if one of the controls in the dialog template is not registered, or its window window procedure fails WM_CREATE or WM_NCCREATE</item>

''' <param name="hInstance">Handle to the instance of the module to be associated with the window.</param> <param name="lpParam">Pointer to a value to be passed to the window through the CREATESTRUCT structure (lpCreateParams member) pointed to by the lParam param of the WM_CREATE message. This message is sent to the created window by this function before it returns.

''' <item>if one of the controls in the dialog template is not registered, or its window window procedure fails WM_CREATE or WM_NCCREATE</item>

When you call this function, the WndProc function must respond to the WM_NCCREATE message by returning TRUE. If it does not, the creation process will fail. A null handle will be returned from CreateWindowEx and GetLastError will return 0. See MSDN on WM_NCCREATE (http://msdn.microsoft.com/en-us/library/ms632635.aspx) and also WM_CREATE (http://msdn.microsoft.com/en-us/library/ms632619.aspx). You can have your WndProc call DefWindowProc, which will take care of this issue.

                switch ((WM)message)

                    case WM.PAINT:

                    case WM.DESTROY:

                return Win32.DefWindowProc(hWnd, (WM)message, wParam, lParam);

    ///<Summary>Sends a WM_NCCALCSIZE message to the window, even if the window's size is not being changed. If this flag is not specified, WM_NCCALCSIZE is sent only when the window's size is being changed.</Summary>

    ///<Summary>Prevents the window from receiving the WM_WINDOWPOSCHANGING message.</Summary>

    '''<Summary>Sends a WM_NCCALCSIZE message to the window, even if the window's size is not being changed. If this flag is not specified, WM_NCCALCSIZE is sent only when the window's size is being changed.</Summary>

    '''<Summary>Prevents the window from receiving the WM_WINDOWPOSCHANGING message.</Summary>

/// <para>The DestroyWindow function destroys the specified window. The function sends WM_DESTROY and WM_NCDESTROY messages to the window to deactivate it and remove the keyboard focus from it. The function also destroys the window's menu, flushes the thread message queue, destroys timers, removes clipboard ownership, and breaks the clipboard viewer chain (if the window is at the top of the viewer chain).</para>

''' <para>The DestroyWindow function destroys the specified window. The function sends WM_DESTROY and WM_NCDESTROY messages to the window to deactivate it and remove the keyboard focus from it. The function also destroys the window's menu, flushes the thread message queue, destroys timers, removes clipboard ownership, and breaks the clipboard viewer chain (if the window is at the top of the viewer chain).</para>

static extern bool DrawMenuBar(IntPtr hWnd);

    static extern bool DrawMenuBar(IntPtr hWnd);

              DrawMenuBar(frm.Handle);

    private const UInt32 WM_CLOSE = 0x0010;

            // Try closing application by sending WM_CLOSE to all child windows in all threads.

        PostMessage(hWnd, WM_CLOSE, IntPtr.Zero, IntPtr.Zero);

   Private Const WM_CLOSE As UInt32 = &H10

       ' Try closing application by sending WM_CLOSE to all child windows in all threads.

     PostMessage(hWnd, WM_CLOSE, IntPtr.Zero, IntPtr.Zero)

    static extern bool DrawMenuBar(IntPtr hWnd);

              DrawMenuBar(frm.Handle);

Sendmessage(hwndMain, WM_COMMAND, intMID,  0) 'Click the MenuItem!

        if (m.Msg == (int)WindowMessages.RawInput)  // WindowMessages.RawInput = 0x00FF (WM_INPUT)

Sendmessage(hwndMain, WM_COMMAND, intMID,  0) 'Click the MenuItem!

    static extern bool DrawMenuBar(IntPtr hWnd);

              DrawMenuBar(frm.Handle);

    static extern bool DrawMenuBar(IntPtr hWnd);

        DrawMenuBar(handle);

static extern uint GetWindowModuleFileName(IntPtr hwnd,

  Private Shared Function GetWindowModuleFileName(hwnd As IntPtr, _

GetWindowModuleFileName(hwnd, fileName, 2000);

    const UInt32 SW_SHOWMINIMIZED =    2;

    const UInt32 SW_SHOWMAXIMIZED =    3;

    const UInt32 SW_SHOWMINNOACTIVE =  7;

///     WM_GETTEXTLENGTH message to be sent to the specified window or control.<br />Under certain conditions, the

///     <br />To obtain the exact length of the text, use the WM_GETTEXT, LB_GETTEXT, or CB_GETLBTEXT messages, or the

    <MarshalAs(UnmanagedType.U4)> ByVal dwMilliseconds as Int32, _

     Byval prmdwMiliseconds as Long _

dwMilliseconds

Messagebox wont time out if dwMilliseconds is 0

   uint dwMilliseconds, uint dwWakeMask, uint dwFlags);

                ByVal dwMilliseconds As Integer, _

        int dwMilliseconds,

   uint dwMilliseconds, uint dwWakeMask, uint dwFlags);

                ByVal dwMilliseconds As Integer, _

static extern bool PeekMessage(out NativeMessage lpMsg, HandleRef hWnd, uint wMsgFilterMin,

   uint wMsgFilterMax, uint wRemoveMsg);

Based off of Tom Miller's blog. Modified to comply with VS.Net 2005 static code analysis (i.e. proper MarshalAs attributes) and eliminate the refrence to WindowMessage.

MSDN recommends using PostQuitMessage over PostMessage when you want to send WM_QUIT http://msdn.microsoft.com/en-us/library/ms632641%28v=vs.85%29.aspx

       private const int WM_POWERBROADCAST = 0x0218;

        if (msg == WM_POWERBROADCAST && wParam.ToInt32() == PBT_POWERSETTINGCHANGE)

///     The <see cref="RegisterWindowMessage" /> function is typically used to register messages for communicating between

///     <see cref="RegisterWindowMessage" /> when more than one application must process the same message.For sending

///     private messages within a window class, an application can use any integer in the range WM_USER through 0x7FFF.

/// static extern uint RegisterWindowMessage(string lpString);

///      queryCancelAutoPlay = RegisterWindowMessage("QueryCancelAutoPlay");

static extern uint RegisterWindowMessage(string lpString);

Private Shared Function RegisterWindowMessage( _

class method RegisterWindowMessage(lpString: String): UInt32; external;

Declare Function RegisterWindowMessage Lib "user32.dll" (ByVal lpString As String) As Integer

    DllImport("user32.dll", EntryPoint = "RegisterWindowMessageW", SetLastError = true)]

    private static extern int RegisterWindowMessage(string lpString);

Declare Function RegisterWindowMessage Lib "user32.dll" Alias "RegisterWindowMessageW" (ByVal lpString As long) As Integer

    lngWindowMsg = RegisterWindowMessage(StrPtr(strMessageToRegister))

If you use RegisterWindowMessage("QueryCancelAutoPlay") it will NOT work, put the "QueryCancelAutoPlay" in a variable or constant and use that one.

    MessageID = RegisterWindowMessage("QueryCancelAutoPlay")

lMsg = Win32.RegisterWindowMessage("WM_HTML_GETOBJECT");

static extern uint RegisterWindowMessage(string lpString);

        queryCancelAutoPlay = RegisterWindowMessage("QueryCancelAutoPlay");

    Public Const WM_NCLBUTTONDOWN As Integer = &HA1

        SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0)

private const int WM_SYSCOMMAND = 0x112;

   SendMessage(ctrl.Handle, WM_SYSCOMMAND, MOUSE_MOVE, ref nul);

    static extern bool DrawMenuBar(IntPtr hWnd);

              DrawMenuBar(frm.Handle);

      UInt32 wMsg,

        UInt32 wMsg,

        UInt32 wMsg,

    private const uint WM_USER      = 0x0400;

    private const uint SB_SETPARTS      = WM_USER + 4;

    private const uint SB_GETPARTS      = WM_USER + 6;

    private const uint SB_GETTEXTLENGTH = WM_USER + 12;

    private const uint SB_GETTEXT       = WM_USER + 13;

/// If SW_INVALIDATE, don't send WM_ERASEBACKGROUND.

   [testing.windows]::SetForegroundWindow( @( Get-Process notepad |? { $_.id -in @( get-wmiobject win32_process -filter "name='notepad.exe'" |% { if ( $_.getowner().user -eq $env:username ) { $_.processid } } ) } )[0].MainWindowHandle)

/* Version specifically setup for use with WM_GETTEXT message */

    int Msg,              // Use WM_GETTEXT

/* Version for a message which returns an int, such as WM_GETTEXTLENGTH. */

lMsg = Win32.RegisterWindowMessage("WM_HTML_GETOBJECT");

C# WM_GETTEXTLENGTH example

const uint WM_GETTEXTLENGTH = 0x000E;

    int result = SendMessageTimeout(hwnd, WM_GETTEXTLENGTH, 0, 0, 0X2C, 5, out length); //0X2C = SMTO_ABORTIFHUNG | SMTO_BLOCK | SMTO_NOTIMEOUTIFNOTHUNG | SMTO_ERRORONEXIT

/* Version specifically setup for use with WM_GETTEXT message */

    int Msg,              // Use WM_GETTEXT

lMsg = Win32.RegisterWindowMessage("WM_HTML_GETOBJECT");

        case (0x0001): // WM_CREATE

        case (0x0002): // WM_DESTROY

        case (0x030D): // WM_CHANGECBCHAIN

        case (0x0308): // WM_DRAWCLIPBOARD

    Dim dwMajorVersion As Integer

    Dim dwMinorVersion As Integer

    const int WM_SYSCOMMAND = 274;

    SendMessage(proc.MainWindowHandle, WM_SYSCOMMAND, SC_MAXIMIZE, 0);

/// <para>Before a window is destroyed (that is, before it returns from processing the WM_NCDESTROY message), an application must remove all entries it has added to the property list. The application must use the RemoveProp function to remove the entries.</para>

Use the version that takes an IntPtr as last parameter and pass it IntPtr.Zero if you are going to handle the WM_TIMER message in your own override of WndProc.

Use the version that takes a delegate as last parameter if you don't explicitly handle the WM_TIMER message or if you don't override WndProc. In that case DefWndProc will invoke your callback when the time-out value elapses.

       const UInt32 SW_SHOWMINIMIZED =    2;

       const UInt32 SW_SHOWMAXIMIZED =    3;

       const UInt32 SW_SHOWMINNOACTIVE =  7;

    ///         <description>Prevents generation of the WM_SYNCPAINT message. </description>

    ///         Applies new frame styles set using the SetWindowLong function. Sends a WM_NCCALCSIZE message

    ///         WM_NCCALCSIZE is sent only when the window's size is being changed

    ///         <description>Prevents the window from receiving the WM_WINDOWPOSCHANGING message.</description>

        ///     Prevents generation of the WM_SYNCPAINT message.

        ///     Applies new frame styles set using the SetWindowLong function. Sends a WM_NCCALCSIZE message to the window, even if the window's size is not being changed. If this flag is not specified, WM_NCCALCSIZE is sent only when the window's size is being changed.

        ///     Prevents the window from receiving the WM_WINDOWPOSCHANGING message.

///     If the target window is owned by the current process, <see cref="SetWindowText" /> causes a WM_SETTEXT message to

///     text of a control in another process, send the WM_SETTEXT message directly instead of calling

    SW_SHOWMINIMIZED = 2,

    SW_SHOWMAXIMIZED = 3,

    SW_SHOWMINNOACTIVE = 7,

• Make sure you also block/delay the WM_QUERYENDSESSION message.

            /// The caller wants hover notification. Notification is delivered as a WM_MOUSEHOVER message.

            /// The caller wants leave notification. Notification is delivered as a WM_MOUSELEAVE message. If the mouse is not over the specified window or area, a leave notification is generated immediately and no further tracking is performed.

            /// The caller wants hover and leave notification for the nonclient areas. Notification is delivered as WM_NCMOUSEHOVER and WM_NCMOUSELEAVE messages.

        Const WM_HOTKEY As Integer = &H312

            Case WM_HOTKEY

        public static int WM_HOTKEY = 0x312;

            if (m.Msg == WindowsShell.WM_HOTKEY)