.

Summary

The FindWindowEx API

C# Signature:

[DllImport("user32.dll", SetLastError = true)]
public static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr hWndChildAfter, string className,  string windowTitle);

VB Signature:

<DllImport("user32.dll", SetLastError:=True, CharSet:=CharSet.Auto)> _
Private Shared Function FindWindowEx(ByVal parentHandle As IntPtr, _
                      ByVal childAfter As IntPtr, _
                      ByVal lclassName As String, _
                      ByVal windowTitle As String) As IntPtr
End Function

User-Defined Types:

None.

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

/// <summary>
/// Gets the handle to the horizontal scroll bar.
/// </summary>
/// <param name="parentControl">The parent window of the scrollbar.</param>
/// <returns>Handle to the scrollbar window.</returns>
private IntPtr GetHandleToHorizontalScrollBar(Control parent)
{
    // Locals
    IntPtr childHandle;
    string appDomainHexedHash;

    // Get the hexadecimal value of AppDomain hash code.
    // This value is dynamically appended to the window class name of the child window
    // for .NET Windows Forms.  This name is viewable via the Spy++ tool.
    appDomainHexedHash = AppDomain.CurrentDomain.GetHashCode().ToString("x");

    // Find window handle
    childHandle = FindWindowEx(
        parent.Handle,    // Parent handle
        IntPtr.Zero,    // Child window after which to seek
        "WindowsForms10.SCROLLBAR.app.0." + appDomainHexedHash, // Class name to seek (viewable in the Spy++ tool)
        IntPtr.Zero);    // Window title to seek

    // Return handle
    return childHandle;
}

private string GetUrlFromIE()
{
    IntPtr windowHandle = GetForegroundWindow();
    IntPtr childHandle;
    String strUrlToReturn = "";

    //try to get a handle to IE's toolbar container
    childHandle = FindWindowEx(windowHandle,IntPtr.Zero,"WorkerW",IntPtr.Zero);
    if(childHandle != IntPtr.Zero)
    {
        //get a handle to address bar
        childHandle = FindWindowEx(childHandle,IntPtr.Zero,"ReBarWindow32",IntPtr.Zero);
        if(childHandle != IntPtr.Zero)
        {
            // get a handle to combo boxex
            childHandle = FindWindowEx(childHandle, IntPtr.Zero, "ComboBoxEx32", IntPtr.Zero);
            if(childHandle != IntPtr.Zero)
            {
                // get a handle to combo box
                childHandle = FindWindowEx(childHandle, IntPtr.Zero, "ComboBox", IntPtr.Zero);
                if(childHandle != IntPtr.Zero)
                {
                    //get handle to edit
                    childHandle = FindWindowEx(childHandle, IntPtr.Zero, "Edit", IntPtr.Zero);
                    if (childHandle != IntPtr.Zero)
                    {
                        strUrlToReturn = GetText(childHandle);
                    }
                }
            }
        }
    }
    return strUrlToReturn;
}

Alternative Managed API:

Do you know one? Please contribute it!

Referrel URL : http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/windows/windowreference/windowfunctions/findwindowex.asp

Documentation

FindWindowEx on MSDN

Here is an alternative Managed API to FindWindow, The article also describes a way to CloseWindow of another process like notepad, not sure if there is such thing in Win32 API, but at least you can do it in .NET! Here is the article:

http://www.mycsharpcorner.com/Post.aspx?postID=32