using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Management; namespace wmi_get_uptime { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private DateTime ParseCIM(string date) { //datetime object to store the return value DateTime parsed = DateTime.MinValue; //check date integrity if (date != null && date.IndexOf('.') != -1) { //obtain the date with miliseconds string newDate = date.Substring(0, date.IndexOf('.') + 4); //check the lenght if (newDate.Length == 18) { //extract each date component int y = Convert.ToInt32(newDate.Substring(0, 4)); int m = Convert.ToInt32(newDate.Substring(4, 2)); int d = Convert.ToInt32(newDate.Substring(6, 2)); int h = Convert.ToInt32(newDate.Substring(8, 2)); int mm = Convert.ToInt32(newDate.Substring(10, 2)); int s = Convert.ToInt32(newDate.Substring(12, 2)); int ms = Convert.ToInt32(newDate.Substring(15, 3)); //compose the new datetime object parsed = new DateTime(y, m, d, h, mm, s, ms); } } //return datetime return parsed; } public TimeSpan GetSystemUptime() { //timespan object to store the result value TimeSpan up = new TimeSpan(); //management objects to interact with WMI ManagementClass m = new ManagementClass("Win32_OperatingSystem"); //loop throught the WMI instances foreach (ManagementObject instance in m.GetInstances()) { //get the LastBootUpTime date parsed (comes in CIM_DATETIME format) DateTime last = ParseCIM(instance["LastBootUpTime"].ToString()); //check it value is not DateTime.MinValue if (last != DateTime.MinValue) //get the diff between dates up = DateTime.Now - last; } //return the uptime TimeSpan return up; } private void button1_Click(object sender, EventArgs e) { //Como chamar ! textBox1.Text = GetSystemUptime().ToString(); } } }
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