During the VB programming process, sometimes you need to terminate some programs through program control. You can use some methods in practice:
1. Use SendMessage
Private Declare Function SendMessage LIB "User32" Alias "SendMessagea" (Byval Hwnd As Long, Byval WParam As Long, LParam As Any) As long
HWnd is a window handle of a window program that needs to be closed;
The message sent can be used in two options 1, WMSG is WM_CLOSE, WPARAM, LPARAM is 0; 2, WMSG is WM_SYSCOMMAND, WPARAM is CS_CLOSE, LPARAM is 0.
2. Use TerminateProcess
Private Declare Function TerminateProcess LIB "kernel32" Alias "TerminateProcess" (Byval UExitcode As long) AS Long
HProcess is a handle of a process to be interrupted;
A exit code of the UEXITCODE process
3. Use Closewindow
Private Declare Function CloseWindow Lib "User32" Alias "Closewindow" (Byval Hwnd As Long) AS Long
HWnd is a handle that wants to close the window.
4. If you want to close all windows, you can use BroadcastsystemMessage.
Private Declare Function BroadcastsystemMessage Lib "User32" Alias "BroadcastsystemMessage" (Byval DW As Long, Byval WParam As Long, BYVAL LPARAM As Long)
DW is one or more of the following constants; BSF_FLUSHDisk After each message is processed, the disk is refreshed with the disk (the data of the unmarked disk, BSF_FORCEIFHUGG Hung, if the target is suspended, then expires after the set timeout Return to BSF_IGNORECURRENTSK Send Task Does Not Access Message BSF_LParambuffer
PDW is one or more of the following constants; the BSF_allcomponents message enters each system component BSF_Applications message to receive messages to the application BSF_INSTALLABLERS message reaches the installed driver BSF_NETDRIVERS message reaches the network driver BSF_VXDS message to the system device driver
UN is the message number;
The message is the same as using SendMessage.
5. Close all programs using EXITWINDOWSEX
Private Declare Function ExitWindowsex lib "user32" Alias "EXITWINDOWSEX" (Byval dwreserved as long) AS Long
Set UFlags to EWX_FORCE forced to have no response processes.
dwreserved is 0
note! The program cannot be closed due to the following reasons.
1. In the NT / 2000 / XP system, the process handle needs to be accessed by Process_Terminate to be killed. 2. If the process to be closed is in the kernal-mode, the TerminateProcess function does not work.
