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getdevicecaps (gdi32)
 
.
Summary

C# Signature:

[DllImport("gdi32.dll")]
static extern int GetDeviceCaps(IntPtr hdc, int nIndex);

VB.NET Signature:

<DllImport("gdi32.dll")> _
Public Shared Function GetDeviceCaps(ByVal hDC As IntPtr, ByVal nIndex As Integer) As Integer
End Function

User-Defined Types:

You can use the following enumeration for passing in as nIndex:

C#

    public enum DeviceCap
    {
        /// <summary>
        /// Device driver version
        /// </summary>
        DRIVERVERSION = 0,
        /// <summary>
        /// Device classification
        /// </summary>
        TECHNOLOGY = 2,
        /// <summary>
        /// Horizontal size in millimeters
        /// </summary>
        HORZSIZE = 4,
        /// <summary>
        /// Vertical size in millimeters
        /// </summary>
        VERTSIZE = 6,
        /// <summary>
        /// Horizontal width in pixels
        /// </summary>
        HORZRES = 8,
        /// <summary>
        /// Vertical height in pixels
        /// </summary>
        VERTRES = 10,
        /// <summary>
        /// Number of bits per pixel
        /// </summary>
        BITSPIXEL = 12,
        /// <summary>
        /// Number of planes
        /// </summary>
        PLANES = 14,
        /// <summary>
        /// Number of brushes the device has
        /// </summary>
        NUMBRUSHES = 16,
        /// <summary>
        /// Number of pens the device has
        /// </summary>
        NUMPENS = 18,
        /// <summary>
        /// Number of markers the device has
        /// </summary>
        NUMMARKERS = 20,
        /// <summary>
        /// Number of fonts the device has
        /// </summary>
        NUMFONTS = 22,
        /// <summary>
        /// Number of colors the device supports
        /// </summary>
        NUMCOLORS = 24,
        /// <summary>
        /// Size required for device descriptor
        /// </summary>
        PDEVICESIZE = 26,
        /// <summary>
        /// Curve capabilities
        /// </summary>
        CURVECAPS = 28,
        /// <summary>
        /// Line capabilities
        /// </summary>
        LINECAPS = 30,
        /// <summary>
        /// Polygonal capabilities
        /// </summary>
        POLYGONALCAPS = 32,
        /// <summary>
        /// Text capabilities
        /// </summary>
        TEXTCAPS = 34,
        /// <summary>
        /// Clipping capabilities
        /// </summary>
        CLIPCAPS = 36,
        /// <summary>
        /// Bitblt capabilities
        /// </summary>
        RASTERCAPS = 38,
        /// <summary>
        /// Length of the X leg
        /// </summary>
        ASPECTX = 40,
        /// <summary>
        /// Length of the Y leg
        /// </summary>
        ASPECTY = 42,
        /// <summary>
        /// Length of the hypotenuse
        /// </summary>
        ASPECTXY = 44,
        /// <summary>
        /// Shading and Blending caps
        /// </summary>
        SHADEBLENDCAPS = 45,

        /// <summary>
        /// Logical pixels inch in X
        /// </summary>
        LOGPIXELSX = 88,
        /// <summary>
        /// Logical pixels inch in Y
        /// </summary>
        LOGPIXELSY = 90,

        /// <summary>
        /// Number of entries in physical palette
        /// </summary>
        SIZEPALETTE = 104,
        /// <summary>
        /// Number of reserved entries in palette
        /// </summary>
        NUMRESERVED = 106,
        /// <summary>
        /// Actual color resolution
        /// </summary>
        COLORRES = 108,

        // Printing related DeviceCaps. These replace the appropriate Escapes
        /// <summary>
        /// Physical Width in device units
        /// </summary>
        PHYSICALWIDTH = 110,
        /// <summary>
        /// Physical Height in device units
        /// </summary>
        PHYSICALHEIGHT = 111,
        /// <summary>
        /// Physical Printable Area x margin
        /// </summary>
        PHYSICALOFFSETX = 112,
        /// <summary>
        /// Physical Printable Area y margin
        /// </summary>
        PHYSICALOFFSETY = 113,
        /// <summary>
        /// Scaling factor x
        /// </summary>
        SCALINGFACTORX = 114,
        /// <summary>
        /// Scaling factor y
        /// </summary>
        SCALINGFACTORY = 115,

        /// <summary>
        /// Current vertical refresh rate of the display device (for displays only) in Hz
        /// </summary>
        VREFRESH = 116,
        /// <summary>
        /// Vertical height of entire desktop in pixels
        /// </summary>
        DESKTOPVERTRES = 117,
        /// <summary>
        /// Horizontal width of entire desktop in pixels
        /// </summary>
        DESKTOPHORZRES = 118,
        /// <summary>
        /// Preferred blt alignment
        /// </summary>
        BLTALIGNMENT = 119
    }

VB

    Public Enum DeviceCap As Integer

    ''' <summary>
    ''' Device driver version
    ''' </summary>
    DRIVERVERSION = 0
    ''' <summary>
    ''' Device classification
    ''' </summary>
    TECHNOLOGY = 2
    ''' <summary>
    ''' Horizontal size in millimeters
    ''' </summary>
    HORZSIZE = 4
    ''' <summary>
    ''' Vertical size in millimeters
    ''' </summary>
    VERTSIZE = 6
    ''' <summary>
    ''' Horizontal width in pixels
    ''' </summary>
    HORZRES = 8
    ''' <summary>
    ''' Vertical height in pixels
    ''' </summary>
    VERTRES = 10
    ''' <summary>
    ''' Number of bits per pixel
    ''' </summary>
    BITSPIXEL = 12
    ''' <summary>
    ''' Number of planes
    ''' </summary>
    PLANES = 14
    ''' <summary>
    ''' Number of brushes the device has
    ''' </summary>
    NUMBRUSHES = 16
    ''' <summary>
    ''' Number of pens the device has
    ''' </summary>
    NUMPENS = 18
    ''' <summary>
    ''' Number of markers the device has
    ''' </summary>
    NUMMARKERS = 20
    ''' <summary>
    ''' Number of fonts the device has
    ''' </summary>
    NUMFONTS = 22
    ''' <summary>
    ''' Number of colors the device supports
    ''' </summary>
    NUMCOLORS = 24
    ''' <summary>
    ''' Size required for device descriptor
    ''' </summary>
    PDEVICESIZE = 26
    ''' <summary>
    ''' Curve capabilities
    ''' </summary>
    CURVECAPS = 28
    ''' <summary>
    ''' Line capabilities
    ''' </summary>
    LINECAPS = 30
    ''' <summary>
    ''' Polygonal capabilities
    ''' </summary>
    POLYGONALCAPS = 32
    ''' <summary>
    ''' Text capabilities
    ''' </summary>
    TEXTCAPS = 34
    ''' <summary>
    ''' Clipping capabilities
    ''' </summary>
    CLIPCAPS = 36
    ''' <summary>
    ''' Bitblt capabilities
    ''' </summary>
    RASTERCAPS = 38
    ''' <summary>
    ''' Length of the X leg
    ''' </summary>
    ASPECTX = 40
    ''' <summary>
    ''' Length of the Y leg
    ''' </summary>
    ASPECTY = 42
    ''' <summary>
    ''' Length of the hypotenuse
    ''' </summary>
    ASPECTXY = 44
    ''' <summary>
    ''' Shading and Blending caps
    ''' </summary>
    SHADEBLENDCAPS = 45

    ''' <summary>
    ''' Logical pixels inch in X
    ''' </summary>
    LOGPIXELSX = 88
    ''' <summary>
    ''' Logical pixels inch in Y
    ''' </summary>
    LOGPIXELSY = 90

    ''' <summary>
    ''' Number of entries in physical palette
    ''' </summary>
    SIZEPALETTE = 104
    ''' <summary>
    ''' Number of reserved entries in palette
    ''' </summary>
    NUMRESERVED = 106
    ''' <summary>
    ''' Actual color resolution
    ''' </summary>
    COLORRES = 108

    ' Printing related DeviceCaps. These replace the appropriate Escapes

    ''' <summary>
    ''' Physical Width in device units
    ''' </summary>
    PHYSICALWIDTH = 110
    ''' <summary>
    ''' Physical Height in device units
    ''' </summary>
    PHYSICALHEIGHT = 111
    ''' <summary>
    ''' Physical Printable Area x margin
    ''' </summary>
    PHYSICALOFFSETX = 112
    ''' <summary>
    ''' Physical Printable Area y margin
    ''' </summary>
    PHYSICALOFFSETY = 113
    ''' <summary>
    ''' Scaling factor x
    ''' </summary>
    SCALINGFACTORX = 114
    ''' <summary>
    ''' Scaling factor y
    ''' </summary>
    SCALINGFACTORY = 115

    ''' <summary>
    ''' Current vertical refresh rate of the display device (for displays only) in Hz
    ''' </summary>
    VREFRESH = 116
    ''' <summary>
    ''' Vertical height of entire desktop in pixels
    ''' </summary>
    DESKTOPVERTRES = 117
    ''' <summary>
    ''' Horizontal width of entire desktop in pixels
    ''' </summary>
    DESKTOPHORZRES = 118
    ''' <summary>
    ''' Preferred blt alignment
    ''' </summary>
    BLTALIGNMENT = 119

    End Enum

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

C#

    static void Main(string[] args)
    {
        using (System.Drawing.Graphics g = System.Drawing.Graphics.FromHwnd(IntPtr.Zero))
        {
        Console.WriteLine("Graphics.DpiX: " + g.DpiX);
        Console.WriteLine("Graphics.DpiY: " + g.DpiY);
        Console.WriteLine();

        IntPtr hdc = g.GetHdc();

        foreach (DeviceCap cap in Enum.GetValues(typeof(DeviceCap)))
        {
            int result = GetDeviceCaps(hdc, cap);
            Console.WriteLine(string.Format("{0}: {1}", cap, result));
        }

        g.ReleaseHdc();
        }

        Console.WriteLine();
        Console.Write("Press any key to exit...");
        Console.ReadKey();
    }

VB

    Private Shared Sub Main(args As String())
        Using g As System.Drawing.Graphics = System.Drawing.Graphics.FromHwnd(IntPtr.Zero)
            Console.WriteLine("Graphics.DpiX: " & g.DpiX)
            Console.WriteLine("Graphics.DpiY: " & g.DpiY)
            Console.WriteLine()

            Dim hdc As IntPtr = g.GetHdc()

            For Each cap As DeviceCap In [Enum].GetValues(GetType(DeviceCap))
                Dim result As Integer = GetDeviceCaps(hdc, cap)
                Console.WriteLine(String.Format("{0}: {1}", cap, result))
            Next

            g.ReleaseHdc()
        End Using

        Console.WriteLine()
        Console.Write("Press any key to exit...")
        Console.ReadKey()
    End Sub

Alternative Managed API:

System.Windows.Forms.Screen.PrimaryScreen might be of help in some cases. (Matt M Jacobsen)

If you are using Graphics as a DeviceContext you can use the DpiX and DpiY attributes. (Julian Taupe)

Documentation

http://msdn2.microsoft.com/en-us/library/ms533266.aspx

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