C# Code:


public static double MillimetersToPixelsWidth(double length) //length是毫米，1厘米=10毫米
{
   System.Windows.Forms.Panel p = new System.Windows.Forms.Panel();
   System.Drawing.Graphics g = System.Drawing.Graphics.FromHwnd(p.Handle);
   IntPtr hdc = g.GetHdc();
   int width = GetDeviceCaps(hdc, 4); // HORZRES
   int pixels = GetDeviceCaps(hdc, 8); // BITSPIXEL
   g.ReleaseHdc(hdc);
   return (((double)pixels / (double)width) * (double)length);
}

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

//来源:C/S框架网(www.csframework.com) QQ:23404761