Screen Capture Need currently use'r started application

Need to know what applications are currently open: All the Application's in the Task Manager.

This is for screen capture, so I ne开发者_如何学Goed some access to location of those application on the screen if possible.

Using .net c# Expression encoder

There is official documentation of which windows appear in the taskbar.

Anyway, something like this should get across the general idea. You can sort the details out yourself now that you know where to look.

using System;
using System.Runtime.InteropServices;
using System.Text;

public delegate bool CallBack(IntPtr hWnd, IntPtr lParam);

public class EnumTopLevelWindows {

    [DllImport("user32", SetLastError=true)]
    private static extern int EnumWindows(CallBack x, IntPtr y);

    [DllImport("user32.dll", SetLastError = true)]
    static extern IntPtr GetParent(IntPtr hWnd);

    [DllImport("user32.dll", EntryPoint = "GetWindowLong", SetLastError = true)]
    private static extern IntPtr GetWindowLongPtr(IntPtr hWnd, int nIndex);

    [DllImport("user32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool IsWindowVisible(IntPtr hWnd);

    [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
    static extern int GetWindowTextLength(IntPtr hWnd);

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount);

    public static string GetText(IntPtr hWnd)
    {
        // Allocate correct string length first
        int length = GetWindowTextLength(hWnd);
        StringBuilder sb = new StringBuilder(length + 1);
        GetWindowText(hWnd, sb, sb.Capacity);
        return sb.ToString();
    }

    private const int GWL_STYLE = -16;
    private const int WS_EX_APPWINDOW = 0x00040000;

    public static void Main() 
    {
        CallBack myCallBack = new CallBack(EnumTopLevelWindows.Report);
        EnumWindows(myCallBack, IntPtr.Zero);
    }

    public static bool Report(IntPtr hWnd, IntPtr lParam)
    {
        if (GetParent(hWnd) == IntPtr.Zero)
        {
            //window is a non-owned top level window
            if (IsWindowVisible(hWnd))
            {
                //window is visible
                int style = GetWindowLongPtr(hWnd, GWL_STYLE).ToInt32();
                if ((style & WS_EX_APPWINDOW) == WS_EX_APPWINDOW)
                {
                    //window has WS_EX_APPWINDOW style
                    Console.WriteLine(GetText(hWnd));
                }
            }
        }
        return true;
    }
}

you can use managed System.Diagnostic.Processes class:

Process[] running = Process.GetProcesses();

foreach(Process p in running)
  Console.WriteLine(p.ProcessName);