Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
Available now!
Buy at Amazon US or
Buy at Amazon UK


» Windows API reference
» Webcam streaming in VB.NET
» Remoting with firewalls
» RSA from first principles
» Key & MouseLogger in .NET
» Networking Resource Kit for .NET
» Migrating VB6 Winsock to VB.NET
» Migrating C++ sockets to C#
» RFC Reference guide
» COM Reference guide
» WMI Reference guide
» SQL stored procedures
» TCP & UDP port reference
» NET Framework reference
» Ethernet Type codes
» MAC address assignments
» DLL entry point reference
» Boost SQL performance
» Free SMS UK
» Free SMS Ireland
» Free SMS South Africa
» Internet Explorer

Contact us

FindWindowEx Reference in C#, VB.NET and VB6


Visual Basic 6 definition
Declare Function FindWindowEx Lib "user32.dll" Alias "FindWindowExA" (ByVal hwndParent As Long, ByVal hwndChildAfter As Long, ByVal lpszClass As String, ByVal lpszWindow As String) As Long

Visual Basic .NET definition
Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" (ByVal hWnd1 As Integer, ByVal hWnd2 As Integer, ByVal lpsz1 As String, ByVal lpsz2 As String) As Integer

C# definition
[DllImport("user32", EntryPoint="FindWindowEx")] public static extern int FindWindowExA(int hWnd1, int hWnd2, string lpsz1, string lpsz2)


FindWindowEx searches for a window matching a specified window class name and/or window name. The function searches all of the child windows of a given window (if desired), beginning with the windows below a specified child window. To ignore the window's class and/or title, pass a null string for those parameters.

Return Value

If successful, the function returns a handle to the found window. If no matching window could be found, or if an error occured, the function returns zero (use GetLastError to get the error code.


Further Information:

For further information on Windows API functions such as these, and how to use these API's in your C# and VB.NET applications, please refer to the book 'Network programming in .NET' (Buy at Amazon UK) (Buy at Amazon US)

Visual Basic 6 example source code

Visual Basic .NET example source code

C# example source code

Provide a code example



Copyright 2018 Infinite Loop Ltd.