The MONITORINFOEX structure contains information about a display monitor.

The GetMonitorInfo function stores information into a MONITORINFOEX structure or a MONITORINFO structure.

The MONITORINFOEX structure is a superset of the MONITORINFO structure. The MONITORINFOEX structure adds a string member to contain a name for the display monitor.

C# Definition:

    // size of a device name string
    private const int CCHDEVICENAME = 32;

    /// <summary>
    /// The MONITORINFOEX structure contains information about a display monitor.
    /// The GetMonitorInfo function stores information into a MONITORINFOEX structure or a MONITORINFO structure.
    /// The MONITORINFOEX structure is a superset of the MONITORINFO structure. The MONITORINFOEX structure adds a string member to contain a name
    /// for the display monitor.
    /// </summary>
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    internal struct MonitorInfoEx
    {
    /// <summary>
    /// The size, in bytes, of the structure. Set this member to sizeof(MONITORINFOEX) (72) before calling the GetMonitorInfo function.
    /// The size, in bytes, of the structure. Set this member to sizeof(MONITORINFOEX) before calling the GetMonitorInfo function.
    /// Doing so lets the function determine the type of structure you are passing to it.
    /// </summary>
    public int Size;

    /// <summary>
    /// A RECT structure that specifies the display monitor rectangle, expressed in virtual-screen coordinates.
    /// Note that if the monitor is not the primary display monitor, some of the rectangle's coordinates may be negative values.
    /// </summary>
    public RectStruct Monitor;

    /// <summary>
    /// A RECT structure that specifies the work area rectangle of the display monitor that can be used by applications,
    /// expressed in virtual-screen coordinates. Windows uses this rectangle to maximize an application on the monitor.
    /// The rest of the area in rcMonitor contains system windows such as the task bar and side bars.
    /// Note that if the monitor is not the primary display monitor, some of the rectangle's coordinates may be negative values.
    /// </summary>
    public RectStruct WorkArea;

    /// <summary>
    /// The attributes of the display monitor.
    ///
    /// This member can be the following value:
    ///   1 : MONITORINFOF_PRIMARY
    /// </summary>
    public uint Flags;

    /// <summary>
    /// A string that specifies the device name of the monitor being used. Most applications have no use for a display monitor name,
    /// and so can save some bytes by using a MONITORINFO structure.
    /// </summary>
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCHDEVICENAME )]
    public string DeviceName;

    public void Init()
    {
        this.Size = 40 + 2 * CCHDEVICENAME;
        this.Size = 72;
        this.DeviceName = string.Empty;
    }
    }

    /// <summary>
    /// The RECT structure defines the coordinates of the upper-left and lower-right corners of a rectangle.
    /// </summary>
    /// <see cref="http://msdn.microsoft.com/en-us/library/dd162897%28VS.85%29.aspx"/>
    /// <remarks>
    /// By convention, the right and bottom edges of the rectangle are normally considered exclusive.
    /// In other words, the pixel whose coordinates are ( right, bottom ) lies immediately outside of the the rectangle.
    /// For example, when RECT is passed to the FillRect function, the rectangle is filled up to, but not including,
    /// the right column and bottom row of pixels. This structure is identical to the RECTL structure.
    /// </remarks>
    [StructLayout(LayoutKind.Sequential)]
    public struct RectStruct
    {
    /// <summary>
    /// The x-coordinate of the upper-left corner of the rectangle.
    /// </summary>
    public int Left;

    /// <summary>
    /// The y-coordinate of the upper-left corner of the rectangle.
    /// </summary>
    public int Top;

    /// <summary>
    /// The x-coordinate of the lower-right corner of the rectangle.
    /// </summary>
    public int Right;

    /// <summary>
    /// The y-coordinate of the lower-right corner of the rectangle.
    /// </summary>
    public int Bottom;      
    }

Alternative Managed API:

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Notes:

If the monitor is the primary monitor the flag will be set too MONITORINFOF_PRIMARY. The declaration for MONITORINFOF_PRIMARY is

const uint MONITORINFOF_PRIMARY = 1;

Tips & Tricks:

Set cbSize to 72 before using MonitorInfoEx

Sample Code:

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