Geek asks and answers

How to access the window?

I am trying to access a specific window using its handle (this value System.IntPtr):

        // Getting the process of Visual Studio program
        var process = Process.GetProcessesByName("devenv")[0];

        // Showing the handle we've got, we've no problem
        MessageBox.Show(this, process.MainWindowHandle.ToString());

        // Attempting to get the main window object by its handle
        var wnd = NativeWindow.FromHandle(process.MainWindowHandle);

        // always fails
        if (wnd == null)
            MessageBox.Show("Failed");
        else
            MessageBox.Show(wnd.ToString(), "Yeeeeees!!");

I also tried to access another main window of the application for demonstrating .net winforms, which I made for this purpose (i.e. I launched a demo application and tried to access its main window with this application), and also failed, although demo and this application are .NET applications. However, this success:

        var process2 = Process.GetCurrentProcess();
        MessageBox.Show(this, process2.MainWindowHandle.ToString());

        var wnd2 = NativeWindow.FromHandle(process2.MainWindowHandle);
        if (wnd2 == null)
            MessageBox.Show("Failed");
        else
            MessageBox.Show(wnd2.ToString(), "Yes");

I think this works because it is called from a single application. So, how can I access another object of the program window by its handle? I thought it could work using C\C++using a header file <windows.h>and then using P \ invoke.

, (.. )?

===================

+3
4

, , Automation? UIAutomationClient UIAutomationTypes

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Automation;
using System.Diagnostics;
using System.Threading;

namespace ConsoleApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            var pInfo = new ProcessStartInfo("notepad");

            var p = Process.Start(pInfo);

            p.WaitForInputIdle();

            AutomationElement installerEditorForm = AutomationElement.FromHandle(p.MainWindowHandle);

            // menus
            AutomationElementCollection menuBars = installerEditorForm.FindAll(TreeScope.Children, new PropertyCondition(
                AutomationElement.ControlTypeProperty, ControlType.MenuBar));

            var mainMenuItem = menuBars[0];

            AutomationElementCollection menus = mainMenuItem.FindAll(TreeScope.Children, new PropertyCondition(
                AutomationElement.ControlTypeProperty, ControlType.MenuItem));

            var fileMenuItem = menus[0];

            ExpandCollapsePattern fileMenuItemOpenPattern = (ExpandCollapsePattern)fileMenuItem.GetCurrentPattern(
                ExpandCollapsePattern.Pattern);

            fileMenuItemOpenPattern.Expand();

            AutomationElement fileMenuItemNew = fileMenuItem.FindFirst(TreeScope.Children,
                new AndCondition(
                    new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.MenuItem),
                    new PropertyCondition(AutomationElement.NameProperty, "New")));

            Console.Read();
        }
    }
}

+2

NativeWindow.FromHandle , null :

NativeWindow ; null.

, , . , NativeWindow . IntPtr.

:

. NativeWindow. API Win32.

+2

? Windows. NativeWindow . API . , , Idispatch, . , , , .

using System.Runtime.InteropServices;

using System.Text;

[DllImport("user32.dll")]
static extern IntPtr GetForegroundWindow();

[DllImport("user32.dll")]
static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int count);

private string GetActiveWindowTitle()
{
    const int nChars = 256;
    IntPtr handle = IntPtr.Zero;
    StringBuilder Buff = new StringBuilder(nChars);
    handle = GetForegroundWindow();

    if (GetWindowText(handle, Buff, nChars) > 0)
    {
        return Buff.ToString();
    }
    return null;
}

, , , . , - DLL- , .

+1

Didn't get what you are really trying to do, but maybe if you try ...

public class ApiUtils
{
    [DllImport("user32")]
    public static extern int SetForegroundWindow(IntPtr hwnd);

    [DllImport("user32.dll")]
    public static extern bool ShowWindow(IntPtr hWnd, ShowWindowCommand nCmdShow);

    [DllImport("user32.dll")]

    public static extern int GetForegroundWindow();

    public static void ActiveWindow(IntPtr hwnd)
    {
        if ((IntPtr)GetForegroundWindow() != hwnd)
        {
            ShowWindow(hwnd, ShowWindowCommand.ShowMaximized);
        }
    }


}

now calls him ...

Process p = Process.Start(new ProcessStartInfo() { FileName = "someApp.exe"});

ApiUtils.ShowWindow(p.MainWindowHandle, WindowShowStyle.ShowNormal);

If it’s not a pity, it doesn’t work out that the question is really good.

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