Get process name from pid or handle

Assuming I already have the handle to a window, I can get the PID with GetWindowThreadProcessId. Is there a way I can get the process n开发者_Go百科ame without having to get all the processes and try to match my PID?

You can use Process.GetProcessById to get Process. Process has a lot of information about the running program. Process.ProcessName gives you the name, Process.MainModule.FileName gives you the name of the executable file.

string name;
using (var p = Process.GetProcessById(id)) { name = p.ProcessName; }

// Here is a neat little method to return the task manager memory. If the process id doesn't exist, it will throw an exception and return 0 for the memory

    /// <summary>
    /// Gets the process memory.
    /// </summary>
    /// <param name="processId">The process identifier.</param>
    /// <returns></returns>
    /// <para> </para>
    /// <para> </para>
    /// <exception cref="ArgumentException"> </exception>
    /// <exception cref="ArgumentNullException"> </exception>
    /// <exception cref="ComponentModel.Win32Exception"> </exception>
    /// <exception cref="InvalidOperationException"> </exception>
    /// <exception cref="PlatformNotSupportedException"> </exception>
    /// <exception cref="UnauthorizedAccessException"> </exception>
    public static long GetProcessMemory(int processId)
    {
        try
        {
            var instanceName = Process.GetProcessById(processId).ProcessName;

            using (var performanceCounter = new PerformanceCounter("Process", "Working Set - Private", instanceName))
            {
                return performanceCounter.RawValue / Convert.ToInt64(1024);
            }
        }
        catch (Exception)
        {
            return 0;
        }
    }