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SendInput (user32)
 
.
Summary

C# Signature:

[DllImport("user32.dll")]
static extern uint SendInput(uint nInputs, INPUT [] pInputs, int cbSize);

VB.NET Signature:

Private Declare Function SendInput Lib "user32.dll" (ByVal cInputs As Integer, ByRef pInputs As INPUT, ByVal cbSize As Integer) As Integer

C# User-Defined Types:

[StructLayout(LayoutKind.Sequential)]
struct MOUSEINPUT
{
      int dx;
      int dy;
      int mouseData;
      int dwFlags;
      int time;
      IntPtr dwExtraInfo;
}

[StructLayout(LayoutKind.Sequential)]
struct KEYBDINPUT
{
      short wVk;
      short wScan;
      int dwFlags;
      int time;
      IntPtr dwExtraInfo;
}

[StructLayout(LayoutKind.Sequential)]
struct HARDWAREINPUT
{
      int uMsg;
      short wParamL;
      short wParamH;
}

[StructLayout(LayoutKind.Explicit)]
struct INPUT
{
      int type;
      MOUSEINPUT mi;
      KEYBDINPUT ki;
      HARDWAREINPUT hi;
}

VB.NET User-Defined Types:

<StructLayout(LayoutKind.Explicit)> _
    Private Structure INPUT
        Dim dwType As Integer
        Dim mouseInput As mouseInput
        Dim keyboardInput As KEYBDINPUT
        Dim hardwareInput As hardwareInput
    End Structure

        <StructLayout(LayoutKind.Explicit)> _
    Private Structure KEYBDINPUT
        <FieldOffset(0)> Public wVk As Short
        <FieldOffset(2)> Public wScan As Short
        <FieldOffset(4)> Public dwFlags As Integer
        <FieldOffset(8)> Public time As Integer
        <FieldOffset(12)> Public dwExtraInfo As IntPtr
    End Structure

        <StructLayout(LayoutKind.Explicit)> _
    Private Structure HARDWAREINPUT
        <FieldOffset(0)> Public uMsg As Integer
        <FieldOffset(4)> Public wParamL As Short
        <FieldOffset(6)> Public wParamH As Short
    End Structure

        <StructLayout(LayoutKind.Explicit)> _
    Private Structure MOUSEINPUT
        <FieldOffset(0)> Public dx As Integer
        <FieldOffset(4)> Public dy As Integer
        <FieldOffset(8)> Public mouseData As Integer
        <FieldOffset(12)> Public dwFlags As Integer
        <FieldOffset(16)> Public time As Integer
        <FieldOffset(20)> Public dwExtraInfo As IntPtr
    End Structure

Notes:

You'll need 3 constants to use this function,.here they are.

[c#]

const int INPUT_MOUSE = 0;

const int INPUT_KEYBOARD = 1;

const int INPUT_HARDWARE = 2;

[/c#]

I don't know how these definitions would be written in VB.NET, sorry.

Tips & Tricks:

Please add some!

Sample Code:

// It might be better to write this code as a single call to SendInput passing
// all the key downs and keys ups in one array.  If you do this, SendInput
// guarantees that no other keys get inbetween the whole sequence.  As is stands,
// a "real" key transition could in theory sneak in the middle - and if it did
// it would inherit the states of shift, control, etc this program had set up.

class Test
{
    public enum VK : ushort
    {
    SHIFT        = 0x10,
    CONTROL          = 0x11,
    MENU         = 0x12,
    ESCAPE           = 0x1B,
    BACK         = 0x08,
    TAB          = 0x09,
    RETURN           = 0x0D,
    PRIOR        = 0x21,
    NEXT         = 0x22,
    END          = 0x23,
    HOME         = 0x24,
    LEFT         = 0x25,
    UP           = 0x26,
    RIGHT        = 0x27,
    DOWN         = 0x28,
    SELECT           = 0x29,
    PRINT        = 0x2A,
    EXECUTE          = 0x2B,
    SNAPSHOT         = 0x2C,
    INSERT           = 0x2D,
    DELETE           = 0x2E,
    HELP         = 0x2F,
    NUMPAD0          = 0x60,
    NUMPAD1          = 0x61,
    NUMPAD2          = 0x62,
    NUMPAD3          = 0x63,
    NUMPAD4          = 0x64,
    NUMPAD5          = 0x65,
    NUMPAD6          = 0x66,
    NUMPAD7          = 0x67,
    NUMPAD8          = 0x68,
    NUMPAD9          = 0x69,
    MULTIPLY         = 0x6A,
    ADD          = 0x6B,
    SEPARATOR        = 0x6C,
    SUBTRACT         = 0x6D,
    DECIMAL          = 0x6E,
    DIVIDE           = 0x6F,
    F1           = 0x70,
    F2           = 0x71,
    F3           = 0x72,
    F4           = 0x73,
    F5           = 0x74,
    F6           = 0x75,
    F7           = 0x76,
    F8           = 0x77,
    F9           = 0x78,
    F10          = 0x79,
    F11          = 0x7A,
    F12          = 0x7B,
    OEM_1        = 0xBA,   // ',:' for US
    OEM_PLUS         = 0xBB,   // '+' any country
    OEM_COMMA        = 0xBC,   // ',' any country
    OEM_MINUS        = 0xBD,   // '-' any country
    OEM_PERIOD       = 0xBE,   // '.' any country
    OEM_2        = 0xBF,   // '/?' for US
    OEM_3        = 0xC0,   // '`~' for US
    MEDIA_NEXT_TRACK     = 0xB0,
    MEDIA_PREV_TRACK     = 0xB1,
    MEDIA_STOP           = 0xB2,
    MEDIA_PLAY_PAUSE     = 0xB3,
    LWIN       =0x5B,
    RWIN       =0x5C
    }

    public struct KEYBDINPUT
    {
    public ushort wVk;
    public ushort wScan;
    public uint dwFlags;
    public long time;
    public uint dwExtraInfo;
    };
    [StructLayout(LayoutKind.Explicit,Size=28)]
    public struct INPUT
    {
    public uint type;
    public KEYBDINPUT ki;
    };

    void Test()
    {
    INPUT structInput;
    structInput = new INPUT();
    structInput.type = Win32Consts.INPUT_KEYBOARD;

    // Key down shift, ctrl, and/or alt
    structInput.ki.wScan = 0;
    structInput.ki.time = 0;
    structInput.ki.dwFlags = 0;
    structInput.ki.dwExtraInfo = Win32.GetMessageExtraInfo();
    if (Shift)
    {
        structInput.ki.wVk = (ushort)VK.SHIFT;
        intReturn = Win32.SendInput(1, ref structInput, (UInt32)sizeof(INPUT));
    }
    if (Ctrl)
    {
        structInput.ki.wVk = (ushort)VK.CONTROL;
        intReturn = Win32.SendInput(1, ref structInput, (UInt32)sizeof(INPUT));
    }
    if (Alt)
    {
        structInput.ki.wVk = (ushort)VK.MENU;
        intReturn = Win32.SendInput(1, ref structInput, (UInt32)sizeof(INPUT));
    }
    if (Win)
    {
        structInput.ki.wVk = (ushort)VK.LWIN;
        intReturn = Win32.SendInput(1, ref structInput, (UInt32)sizeof(INPUT));
    }
    // Key down the actual key-code
    structInput.ki.wVk = vk;
    intReturn = Win32.SendInput(1, ref structInput, (UInt32)sizeof(INPUT));
    // Key up the actual key-code
    structInput.ki.dwFlags = Win32Consts.KEYEVENTF_KEYUP;
    intReturn = Win32.SendInput(1, ref structInput, (UInt32)sizeof(INPUT));
    // Key up shift, ctrl, and/or alt
    if (Shift)
    {
        structInput.ki.wVk = (ushort)VK.SHIFT;
        intReturn = Win32.SendInput(1, ref structInput, (UInt32)sizeof(INPUT));
    }
    if (Ctrl)
    {
        structInput.ki.wVk = (ushort)VK.CONTROL;
        intReturn = Win32.SendInput(1, ref structInput, (UInt32)sizeof(INPUT));
    }
    if (Alt)
    {
        structInput.ki.wVk = (ushort)VK.MENU;
        intReturn = Win32.SendInput(1, ref structInput, (UInt32)sizeof(INPUT));
    }
    if (Win)
    {
        structInput.ki.wVk = (ushort)VK.LWIN;
        intReturn = Win32.SendInput(1, ref structInput, (UInt32)sizeof(INPUT));
    }
    }
}

VB.NET Sample Code:

        Private Sub SendInputStream()
            ' Synthesize the user clicking the right mouse button.
            Dim inputevents As New Input              ' holds information about each event
            Dim mouseevent As MOUSEINPUT              ' temporarily hold mouse input info

            ' Load the information needed to synthesize pressing the right mouse button.
            inputevents.mouseInput.dx = 0              ' no horizontal movement
            inputevents.mouseInput.dy = 0              ' no vertical movement
            inputevents.mouseInput.mouseData = 0              ' not needed
            inputevents.mouseInput.dwFlags = MOUSEEVENTF_RIGHTDOWN              ' right button down
            inputevents.mouseInput.time = 0              ' use the default
            inputevents.mouseInput.dwExtraInfo = GetMessageExtraInfo()              ' not needed
            ' Copy the structure into the input array's buffer.
            inputevents.dwType = INPUT_MOUSE              ' mouse input
            ' Now that all the information for the four input events has been placed
            ' into the array, finally send it into the input stream.
            SendInput(1, inputevents, Marshal.SizeOf(inputevents))               ' place the events into the stream

            ' Do the same as above, but for releasing the right mouse button.
            inputevents.mouseInput.dx = 0              ' no horizontal movement
            inputevents.mouseInput.dy = 0              ' no vertical movement
            inputevents.mouseInput.mouseData = 0              ' not needed
            inputevents.mouseInput.dwFlags = MOUSEEVENTF_RIGHTUP              ' right button up
            inputevents.mouseInput.time = 0              ' use the default
            inputevents.mouseInput.dwExtraInfo = GetMessageExtraInfo()              ' not needed
            ' Copy the structure into the input array's buffer.
            inputevents.dwType = INPUT_MOUSE              ' mouse input
            SendInput(1, inputevents, Marshal.SizeOf(inputevents))               ' place the events into the stream
        End Sub

Alternative Managed API:

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Documentation
SendInput on MSDN

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