WIN32 API

Sample Code To Create and Kill A Process:

void CWindowHandleDlg::OnBnClickedOk()

{
   STARTUPINFO StartupInfo;

   PROCESS_INFORMATION PrcInfo;
   HANDLE hHandle;
   DWORD dwExitCode=0;

    memset(&StartupInfo,0,sizeof(StartupInfo));
   StartupInfo.cb = sizeof(StartupInfo);
   StartupInfo.dwFlags = STARTF_USESHOWWINDOW;
   StartupInfo.wShowWindow = SW_SHOW;

   ::CreateProcess("C:\\Windows\\System3\\Notepad.exe",NULL,NULL,NULL,FALSE,0,NULL,NULL,&StartupInfo,&PrcInfo);  /*Create Process

    hHandle = ::OpenProcess(PROCESS_ALL_ACCESS,0,PrcInfo.dwProcessId); // handle of that process

  ::GetExitCodeProcess(hHandle,&dwExitCode); // Check for the status of that handle

   if(dwExitCode==STILL_ACTIVE) // if its active terninate the process.
      ::TerminateProcess(hHandle,dwExitCode);
 }

 Initially a Thread is created by CreateProcess

Create A Process:

 BOOL WINAPI CreateProcess(

_in_opt LPCTSTR lpApplicationName, __inout_opt LPTSTR lpCommandLine,
__in_opt LPSECURITY_ATTRIBUTES lpProcessAttributes,
__in_opt LPSECURITY_ATTRIBUTES lpThreadAttributes,
__in BOOL bInheritHandles,
__in DWORD dwCreationFlags,
__in_opt LPVOID lpEnvironment,
__in_opt LPCTSTR lpCurrentDirectory,
__in LPSTARTUPINFO lpStartupInfo,
__out LPPROCESS_INFORMATION lpProcessInformation
);

• lpApplicationName - the Exe which has to be launched. The 9 th and the 10 th parameter must be initialized .
• You can leave all the other parameters  as null and the bool variable bInheritHandles (which allows inheritance) can be set to  FALSE .
• A structure STARTUPINFO has to be passed. Before passing it is memset to zero. The structure's variable cb has to be intialized to the structure size.
• lpProcessInformation has to be passed which stores all the information about the launched exe such as ProcessID ,ThreadID..etc.

Check the Status of Process Created:

• Before Terminating the process its better to check for the exsistence of the process.
• Handle of the process created is recieved from the variable lpProcessInformation.dwProcessId.
• If the process is still active then we can terinate the process.

Terminating the process:
       ::TerminateProcess(hHandle,dwExitCode);

• Just the window handle alone with the status of that handle.