This article was previously published under Q186431
This article describes how to use the BringToTop and FindWindow APIfunctions to bring another window to the foreground with the focus.
Start a new Standard EXE project in Visual Basic. Form1 is created by default.
Add three CommandButtons to Form1. You might want to increase the size of Command2 and Command3 to allow you to read the caption.
Copy the following code to the General Declarations section of Form1:
Option Explicit Dim THandle As Long Private Declare Function BringWindowToTop Lib "user32" (ByVal _ hwnd As Long) As Long Private Declare Function FindWindow Lib "user32" Alias _ "FindWindowA" (ByVal lpClassName As Any, ByVal lpWindowName _ As Any) As Long Private Sub Form_Load() Command1.Caption = "Run the Calculator" Command2.Caption = "Find Calculator's Handle" Command3.Caption = "Bring Calculator To The Top" Command2.Enabled = False Command3.Enabled = False End Sub Private Sub Command1_Click() Dim X As Long X = Shell("Calc.exe", 1) If X <> 0 Then Command2.Enabled = True End If End Sub Private Sub Command2_click() THandle = FindWindow(vbEmpty, "Calculator") If THandle = 0 Then Command3.Enabled = False MsgBox "Sorry, the calculator is running" Exit Sub End If Command3.Enabled = True End Sub Private Sub Command3_click() Dim iret As Long iret = BringWindowToTop(THandle) End Sub
Run the Program. When you click Command1, the calculator will appear and Command2 will be enabled. Enlarge the size of this program to maximize screen usage and then click Command2. If it finds the window handle for Calculator, it will enable Command3.
Click Command3, and note that the Calculator window will be brought to the front so that it has the focus.
For more information about API calls and API functions, search using thekeywords "API" or "Declare" in the Visual Basic On-line Help.
For information about creating a form that always stays on top, please seethe following article in the Microsoft Knowledge Base:
184297 : How To Create a Form That Always Stays on Top
(c) Microsoft Corporation 1998, All Rights Reserved. Contributions byRichard T. Edwards, Microsoft Corporation