C# Definition:

    [StructLayout(LayoutKind.Explicit)]
    public struct INPUT_RECORD
    {
        [FieldOffset(0)]
        public ushort EventType;
        [FieldOffset(4)]
        public KEY_EVENT_RECORD KeyEvent;
        [FieldOffset(4)]
        public MOUSE_EVENT_RECORD MouseEvent;
        [FieldOffset(4)]
        public WINDOW_BUFFER_SIZE_RECORD WindowBufferSizeEvent;
        [FieldOffset(4)]
        public MENU_EVENT_RECORD MenuEvent;
        [FieldOffset(4)]
        public FOCUS_EVENT_RECORD FocusEvent;
    };

C# Definition:

    // Helper structure to represent the union and guarantee the correct alignment for
    // both 32-bit and 64-bit Windows.
    [StructLayout(LayoutKind.Explicit)]
    public struct INPUT_RECORD_UNION
    {
        [FieldOffset(0)]
        public KEY_EVENT_RECORD KeyEvent;
        [FieldOffset(0)]
        public MOUSE_EVENT_RECORD MouseEvent;
        [FieldOffset(0)]
        public WINDOW_BUFFER_SIZE_RECORD WindowBufferSizeEvent;
        [FieldOffset(0)]
        public MENU_EVENT_RECORD MenuEvent;
        [FieldOffset(0)]
        public FOCUS_EVENT_RECORD FocusEvent;
    };

    [StructLayout(LayoutKind.Sequential)]
    public struct INPUT_RECORD
    {
        public ushort EventType;
        public INPUT_RECORD_UNION Event;
    };

VB Definition:

    <StructLayout(LayoutKind.Explicit)> _
    Public Structure INPUT_RECORD
        <FieldOffset(0)> Public EventType As System.UInt16
        <FieldOffset(4)> Public KeyEvent As KEY_EVENT_RECORD
        <FieldOffset(4)> Public MouseEvent As MOUSE_EVENT_RECORD
        <FieldOffset(4)> Public WindowBufferSizeEvent As WINDOW_BUFFER_SIZE_RECORD
        <FieldOffset(4)> Public MenuEvent As MENU_EVENT_RECORD
        <FieldOffset(4)> Public FocusEvent As FOCUS_EVENT_RECORD
    End Structure

VB Definition:

    ' Helper structure to represent the union and guarantee the correct alignment for
    ' both 32-bit and 64-bit Windows.
    <StructLayout(LayoutKind.Explicit)> _
    Public Structure INPUT_RECORD_UNION
        <FieldOffset(0)> Public KeyEvent As KEY_EVENT_RECORD
        <FieldOffset(0)> Public MouseEvent As MOUSE_EVENT_RECORD
        <FieldOffset(0)> Public WindowBufferSizeEvent As WINDOW_BUFFER_SIZE_RECORD
        <FieldOffset(0)> Public MenuEvent As MENU_EVENT_RECORD
        <FieldOffset(0)> Public FocusEvent As FOCUS_EVENT_RECORD
    End Structure

    <StructLayout(LayoutKind.Sequential)> _
    Public Structure INPUT_RECORD
        Public EventType As UShort
        Public [Event] As INPUT_RECORD_UNION
    End Structure

User-Defined Field Types:

• KEY_EVENT_RECORD
• MOUSE_EVENT_RECORD
• WINDOW_BUFFER_SIZE_RECORD
• MENU_EVENT_RECORD
• FOCUS_EVENT_RECORD

Notes:

Defined in wincon.h

Windows 10 SDK: wincontypes.h

Event-Types:

    Public Enum InputEventTypes
        KEY_EVENT = &H1
        MOUSE_EVENT = &H2
        WINDOW_BUFFER_SIZE_EVENT = &H4
        MENU_EVENT = &H8
        FOCUS_EVENT = &H10
    End Enum

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