如何使用c#获得以毫米为单位的屏幕尺寸
本文关键字:为单位 屏幕 何使用 | 更新日期: 2023-09-27 18:16:16
目前我正在开发心电波形绘制程序,心电波形绘制速度为25mm/s。所以我需要将像素转换为毫米。
现在,我想使用c#获得以毫米为单位的屏幕尺寸。现在我有2台显示器,我希望知道所有显示器的屏幕尺寸,我知道如何得到像素大小,但我不知道如何得到毫米值。
我搜索谷歌,发现使用WMI可以得到屏幕尺寸,我尝试了,但失败了。有人能给我一些建议吗?
我在stackoverflow中找到了一些代码,以毫米为单位获取屏幕的大小。使用WMI枚举屏幕,并获取设备id。使用设备id从注册表中获取EDID。然后读取"edid"数组的第21,22项,以获得屏幕的宽度和高度,单位为毫米。
public static List<PointF> GetDesktopMonitors()
{
List<PointF> screenSizeList = new List<PointF>();
//////////////////////////////////////////////////////////////////////////
try
{
ManagementObjectSearcher searcher = new ManagementObjectSearcher("root''WMI", "SELECT * FROM WmiMonitorID");
foreach (ManagementObject queryObj in searcher.Get())
{
Debug.WriteLine("-----------------------------------------------");
Debug.WriteLine("WmiMonitorID instance");
Debug.WriteLine("----------------");
// Console.WriteLine("Active: {0}", queryObj["Active"]);
Debug.WriteLine("InstanceName: {0}", queryObj["InstanceName"]);
// dynamic snid = queryObj["SerialNumberID"];
// Debug.WriteLine("SerialNumberID: (length) {0}", snid.Length);
Debug.WriteLine("YearOfManufacture: {0}", queryObj["YearOfManufacture"]);
/*
foreach (PropertyData data in queryObj.Properties)
{
Debug.WriteLine(data.Value.ToString());
}
*/
dynamic code = queryObj["ProductCodeID"];
string pcid = "";
for (int i = 0; i < code.Length; i++)
{
pcid = pcid + Char.ConvertFromUtf32(code[i]);
//pcid = pcid +code[i].ToString("X4");
}
Debug.WriteLine("ProductCodeID: " + pcid);
int xSize = 0;
int ySize = 0;
string PNP = queryObj["InstanceName"].ToString();
PNP = PNP.Substring(0, PNP.Length - 2); // remove _0
if (PNP != null && PNP.Length > 0)
{
string displayKey = "SYSTEM''CurrentControlSet''Enum''";
string strSubDevice = displayKey + PNP + "''" + "Device Parameters''";
// e.g.
// SYSTEM'CurrentControlSet'Enum'DISPLAY'LEN40A0'4&1144c54c&0&UID67568640'Device Parameters
// SYSTEM'CurrentControlSet'Enum'DISPLAY'LGD0335'4&1144c54c&0&12345678&00&02'Device Parameters
//
Debug.WriteLine("Register Path: " + strSubDevice);
RegistryKey regKey = Registry.LocalMachine.OpenSubKey(strSubDevice, false);
if (regKey != null)
{
if (regKey.GetValueKind("edid") == RegistryValueKind.Binary)
{
Debug.WriteLine("read edid");
byte[] edid = (byte[])regKey.GetValue("edid");
const int edid_x_size_in_mm = 21;
const int edid_y_size_in_mm = 22;
xSize = ((int)edid[edid_x_size_in_mm] * 10);
ySize = ((int)edid[edid_y_size_in_mm] * 10);
Debug.WriteLine("Screen size cx=" + xSize.ToString() + ", cy=" + ySize.ToString());
}
regKey.Close();
}
}
Debug.WriteLine("-----------------------------------------------");
PointF pt = new PointF();
pt.X = (float)xSize;
pt.Y = (float)ySize;
screenSizeList.Add(pt);
}
}
catch (ManagementException e)
{
Console.WriteLine("An error occurred while querying for WMI data: " + e.Message);
}
return screenSizeList;
}
参考以下链接,
http://www.dallinjones.com/2008/07/how-to-convert-from-pixels-to-millimeters/转换像素为英寸,反之亦然c#