Close api

Can someone give me the code for the api
called "Close"
Thanks!

Close what?
a program by its hwnd?

No the api does it. and its called
close .. It minimises the hwnd named

u can use the send_message API if u need to close a window.





[Edited by rammy on 08-22-2000 at 12:10 AM]

Code:

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Private Declare Function CloseWindow Lib "user32" Alias "CloseWindow" (ByVal hwnd As Long) As Long

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Here is how to close a Window:

Code:

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Declare Function FindWindow Lib "user32" Alias _
"FindWindowA" (ByVal lpClassName As String, _
ByVal lpWindowName As String) As Long                   
Declare Function PostMessage Lib "user32" Alias _
"PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, _
ByVal wParam As Long, lParam As Any) As Long                   
Public Const WM_CLOSE = &H10 

Dim winHwnd As Long
Dim RetVal As Long
winHwnd = FindWindow(vbNullString, "WindowCaption")
Debug.Print winHwnd
If winHwnd <> 0 Then
    RetVal = PostMessage(winHwnd, WM_CLOSE, 0&, 0&)   
If RetVal = 0 Then
        MsgBox "Error posting message."
    End If
Else
    MsgBox "The Window is not open."
End If

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If you want to minimize it:

Code:

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Declare Function ShowWindow Lib "User" (ByVal hWnd As Integer, ByVal nCmdShow As Integer) As Integer
Public Const SW_MINIMIZE = 6

Dim winHwnd As Long
winHwnd = FindWindow(vbNullString, "WindowCaption")
If winHwnd = 0 Then
Msgbox "Window Not Found!", 16
Else
X = ShowWindow(winHwnd , SW_MINIMIZE)
End If

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[Edited by Matthew Gates on 08-22-2000 at 12:21 AM]

What is the difference Between SendMessage and PostMessage ???

Good question. Don't know about PostMessage, but SendMessage sends a message to the application asking it to close. I guess PostMessage posts a message instead of sending one :D.

But here is another way to kill an application by it's path.
And it works very well.

Code:

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Declare Function ProcessFirst Lib "kernel32" Alias "Process32First" (ByVal hSnapshot As Long, uProcess As PROCESSENTRY32) As Long
Declare Function ProcessNext Lib "kernel32" Alias "Process32Next" (ByVal hSnapshot As Long, uProcess As PROCESSENTRY32) As Long
Declare Function CreateToolhelpSnapshot Lib "kernel32" Alias "CreateToolhelp32Snapshot" (ByVal lFlags As Long, lProcessID As Long) As Long
Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long

Type PROCESSENTRY32
    dwSize As Long
    cntUsage As Long
    th32ProcessID As Long
    th32DefaultHeapID As Long
    th32ModuleID As Long
    cntThreads As Long
    th32ParentProcessID As Long
    pcPriClassBase As Long
    dwFlags As Long
    szexeFile As String * MAX_PATH
    End Type

Public Function KillApp(myName As String) As Boolean
    Const PROCESS_ALL_ACCESS = 0
    Dim uProcess As PROCESSENTRY32
    Dim rProcessFound As Long
    Dim hSnapshot As Long
    Dim szExename As String
    Dim exitCode As Long
    Dim myProcess As Long
    Dim AppKill As Boolean
    Dim appCount As Integer
    Dim i As Integer
    On Local Error GoTo Finish
    appCount = 0
   
    Const TH32CS_SNAPPROCESS As Long = 2&
   
    uProcess.dwSize = Len(uProcess)
    hSnapshot = CreateToolhelpSnapshot(TH32CS_SNAPPROCESS, 0&)
    rProcessFound = ProcessFirst(hSnapshot, uProcess)
   
    Do While rProcessFound
        i = InStr(1, uProcess.szexeFile, Chr(0))
        szExename = LCase$(Left$(uProcess.szexeFile, i - 1))
        If Right$(szExename, Len(myName)) = LCase$(myName) Then
            KillApp = True
            appCount = appCount + 1
            myProcess = OpenProcess(PROCESS_ALL_ACCESS, False, uProcess.th32ProcessID)
            AppKill = TerminateProcess(myProcess, exitCode)
            Call CloseHandle(myProcess)
        End If
        rProcessFound = ProcessNext(hSnapshot, uProcess)
    Loop

    Call CloseHandle(hSnapshot)
Finish:
End Function

Usage:

Call KillApp("C:\Apppath\app.exe")

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Quote:

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Good question. Don't know about PostMessage, but SendMessage sends a message to the application asking it to close. I guess PostMessage posts a message instead of sending one .

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I know what SendMessage Does. :p

does anybody else have a clue to what PostMessage does? or how its different?

PostMessage posts a message in the message queue and returns without waiting for the thread to process the message, whereas SendMessage waits until the message is processed then returns.

To minimize a window, use the CloseWindow API

Code:

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Private Private Declare Function CloseWindow Lib "user32" Alias "CloseWindow" (ByVal hwnd As Long) As Long

Private Sub Command1_Click()
    CloseWindow hwnd
End Sub

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So there isn't any way to fetch the result when using PostMessage?