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How To Kill A Process From Your Application


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I like to ask that how can i kill or close a process from my code

suppose a process is already running in the memory e.g Notepad opened or some game is running than how can we close it from our code.

(languages can be any :masm, c++, vb).

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Hi,I will explain this using the example of "Notepad". Suppose you have an instance of Notepad running, with the title "untitled - Notepad". To kill this from your application , you need to do the following :-

Declare the functions from user32.dll

public const int WM_SYSCOMMAND = 0x0112;
public const int SC_CLOSE = 0xF060;
public static extern int FindWindow(
string lpClassName, // class name
string lpWindowName // window name
public static extern int SendMessage(
int hWnd, // handle to destination window
uint Msg, // message
int wParam, // first message parameter
int lParam // second message parameter

Then use the following to close the procces

string myClass = "notepad"; string myTitle = "untitled - Notepad";
int HND = FindWindow(myclass, myTitle); //returns the handle of the window.
if (HND != 0 )
int retn = SendMessage(HND, Win32.WM_SYSCOMMAND, Win32.SC_CLOSE, 0); //Sends the message to that process to close.

The above is in C#, hope you can do this in VB(almost the same).


Edited by oricode
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use this to kill a another app

szProcs db "notepad.exe",0
KillProcess Proc _IdProcess:DWORD
mov uProcess.dwSize, sizeof uProcess
invoke CreateToolhelp32Snapshot, TH32CS_SNAPPROCESS, 0
mov hSnapshot, eax
invoke Process32First, hSnapshot,addr uProcess
.while eax
xor ecx, ecx
lea esi, [uProcess.szExeFile]
mov ebx, esi
dec ebx
invoke lstrlen, esi
add esi, eax
.while esi!=ebx
invoke lstrcmpi, esi, _IdProcess
.if !eax
invoke OpenProcess, PROCESS_TERMINATE, 1, uProcess.th32ProcessID
invoke TerminateProcess, eax, 0
jmp done
; optimize this
dec esi
invoke Process32Next, hSnapshot, ADDR uProcess
invoke CloseHandle, hSnapshot
KillProcess endp



Edited by ragdog
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