You are currently offline, waiting for your internet to reconnect

How To Close Applications from Visual Basic

This article was previously published under Q153463
SUMMARY
Periodically it may be necessary for a programmer to close down anotherapplication from Visual Basic code. For example, your application mightconflict with some other known utility, so you need to close theconflicting utility so your application can work correctly. The step-by-step example in this article shows how to do it using the Windows API.
MORE INFORMATION

Step-by-Step Example

  1. Start a new Visual Basic project. Form1 is created by default.
  2. Add a command button (Command1) to Form1.
  3. Add the following code to the General Declarations section of Form1:
       Option Explicit   Private Declare Function FindWindow Lib "User" (ByVal lpClassName _      As Any, ByVal lpWindowName As Any) As Integer   Private Declare Function PostMessage Lib "User" (ByVal hWnd _      As Integer, ByVal wMsg As Integer, ByVal wParam As Integer, _      lParam As Any) As Integer   Private Const WM_QUIT = &H12   Private Sub Command1_Click()     Dim sTitle As String     Dim iHwnd As Integer     Dim ihTask As Integer     Dim iReturn As Integer     sTitle = "Notepad - (Untitled)"     iHwnd = FindWindow(0&, sTitle)     iReturn = PostMessage(iHwnd, WM_QUIT, 0, 0&)     MsgBox "Notepad has been Closed Down"   End Sub						
  4. Start Notepad by double-clicking the Notepad Icon.
  5. Activate Visual Basic, and press F5 to start the project. Click the command button and the instance of Notepad you started should automatically close down. The message box will confirm this.
NOTE: For Visual Basic for Windows, 32-bit only, version 4.0 and VisualBasic for Windows version 5.0, you need to use the following code:
  1. Start a new Visual Basic project. Form1 is created by default.
  2. Add a command button (Command1) to Form1.
  3. Add the following code to the General Declarations section of Form1:
       Option Explicit   Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal     lpClassName As Any, ByVal lpWindowName As Any) As Long   Private Declare Function PostMessage Lib "user32" Alias "PostMessageA"     (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam     As Long) As Long   Private Const WM_QUIT = &H12   Private Sub Command1_Click()    Dim sTitle As String     Dim iHwnd As Long     Dim ihTask As Long     Dim iReturn As Long     sTitle = "Untitled - Notepad"     iHwnd = FindWindow(0&, sTitle)     iReturn = PostMessage(iHwnd, WM_QUIT, 0&, 0&)     MsgBox "Notepad has been Closed Down"  End Sub						
  4. Start Notepad by double-clicking the Notepad Icon.
  5. Activate Visual Basic, and press the F5 key to start the project. the command button and the instance of Notepad you started should automatically close down. The message box will confirm this.
Properties

Article ID: 153463 - Last Review: 06/29/2004 21:46:00 - Revision: 4.1

  • Microsoft Visual Basic 4.0 Standard Edition
  • Microsoft Visual Basic 4.0 Professional Edition
  • Microsoft Visual Basic 4.0 Enterprise Edition
  • kbhowto KB153463
Feedback