acquire monitor physical dimension [duplicate]

Answer 1

You can get the screen resolution of the current screen by using SystemInformation.PrimaryMonitorSize.Width and SystemInformation.PrimaryMonitorSize.Height. The number of pixels per inch you can get from a Graphics object: Graphics.DpiX and Graphics.DpiY. The rest is just a simple equation (Pythagoras). I hope that helps, David.

Answer 2

You can use the GetDeviceCaps() WinAPI with HORZSIZE and VERTSIZE parameters.

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

private const int HORZSIZE = 4;
private const int VERTSIZE = 6;
private const double MM_TO_INCH_CONVERSION_FACTOR = 25.4;

void  Foo()
{
    var hDC = Graphics.FromHwnd(this.Handle).GetHdc();
    int horizontalSizeInMilliMeters = GetDeviceCaps(hDC, HORZSIZE);
    double horizontalSizeInInches = horizontalSizeInMilliMeters / MM_TO_INCH_CONVERSION_FACTOR;
    int vertivalSizeInMilliMeters = GetDeviceCaps(hDC, VERTSIZE);
    double verticalSizeInInches = vertivalSizeInMilliMeters / MM_TO_INCH_CONVERSION_FACTOR;
}