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I want to stop opening the software many times

 
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gavrielsinvani
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PostPosted: Sat Mar 28, 2020 8:58 am    Post subject: I want to stop opening the software many times Reply with quote
i have lua trianer And I want it to be open only once no multiple.


please help , thanks..
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Corroder
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PostPosted: Sat Mar 28, 2020 10:43 am    Post subject: Reply with quote
Easy, just open it once, right?
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mindoff
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PostPosted: Wed Apr 01, 2020 8:57 pm    Post subject: Reply with quote
I know there is a Win32 API called CreateMutex can do this with C++ in my own win32 app.

That can prevent openning multiple instance,keep only one instance.

But I don't know how to do this in lua.

Want to see how lua version written.

Here is my C++ code

Code:

#include <windows.h>

HANDLE win32Mutex = NULL;

...

win32Mutex = CreateMutex(NULL, FALSE, "MyWin32Mutex");
if (GetLastError() == ERROR_ALREADY_EXISTS)
{
   CloseHandle(win32Mutex);
   win32Mutex = NULL;
   MessageBoxA(NULL, "Only 1 instance works", "Only 1 instance works", MB_OK);
   return;//exit app
}


And I think there may be other way to check same instance,something like window title string if you give it an unique name.
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Corroder
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PostPosted: Thu Apr 02, 2020 6:41 am    Post subject: Reply with quote
First, if ported C++ code by @mindoff, maybe something like this in CE Lua:

Code:
function CreateMutex(lpMutexAttributes, bInitialOwner, lpName)
 return  executeCodeLocalEx("kernel32.CreateMutex",lpMutexAttributes, bInitialOwner, lpName)
end

function ReleaseMutex(hMutex)
 return  executeCodeLocalEx("kernel32.ReleaseMutex",hMutex)
end

function GetLastError(SetLastError, flag)
 SetLastError = true
 return  executeCodeLocalEx("kernel32.GetLastError", SetLastError)
end

function CloseHandle(hObject)
 return  executeCodeLocalEx("kernel32.CloseHandle", hObject)
end

ERROR_ALREADY_EXISTS    = 183
win32Mutex = nil
win32Mutex = CreateMutex(nil, false, "MyWin32Mutex")

if (GetLastError() == ERROR_ALREADY_EXISTS)
   CloseHandle(win32Mutex)
   win32Mutex = nil
   showMessage("Only 1 instance works")
   return
end



But the code above seems not to work or need to modify. So, for me, if I want to prevent open multi instances for the same apps, I will use this:

Code:
list = createStringlist()
myprocess = "notepad.exe"

WM_SYSCOMMAND = 0x112
SC_MAXIMIZE = 0xF030
SC_MINIMIZE = 0xF020
SC_CLOSE = 0xF060

function closewindow(hWnd, msg, wParam, lParam)
 return  executeCodeLocalEx("user32.SendMessageA", hWnd, msg, wParam, lParam)
end

function avoidMultiInstances()
 getProcesslist(list)
 local count = 0

 for i=0,list.count-1 do
    if list[i]:find(myprocess) then
       count = count + 1
    end
 end

 if count > 1 then
   --t.Enabled = false
   local w = GetForegroundWindow()
   if w ~= 0 then closewindow(w, WM_SYSCOMMAND, SC_CLOSE, 0) end
   showMessage('Only one instance allowed')
   return
 end
 list.clear()
end

t = createTimer(nil)
t.OnTimer = avoidMultiInstances
t.Interval = 200
t.Enabled = true


Tested and works.
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Dark Byte
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PostPosted: Thu Apr 02, 2020 6:55 am    Post subject: Reply with quote
sharedMemory is easier:
Code:

l=allocateSharedMemoryLocal('MyTrainer',15) --allocates 4096 anyhow
if readStringLocal(l,11)=='DO NOT LOAD' then
  showMessage('already loaded')
  return -- or closeCE()
end
writeStringLocal(l,"DO NOT LOAD")
showMessage('First one')


as long as one process is open with the shared memory object called "MyTrainer" it will exist. Once the last process with it closes, it gets destroyed as well
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daspamer
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PostPosted: Thu Apr 02, 2020 7:24 am    Post subject: Reply with quote
Personally been using createPipe to prevent duplicates for some time, great alternatives tho

Code:
local pipeExists = createPipe('unique_pipe_name');
if (not pipeExists) then
   return showMessage('duplicated');
end

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Corroder
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PostPosted: Thu Apr 02, 2020 8:33 am    Post subject: Reply with quote
Dark Byte wrote:
sharedMemory is easier:
Code:

l=allocateSharedMemoryLocal('MyTrainer',15) --allocates 4096 anyhow
if readStringLocal(l,11)=='DO NOT LOAD' then
  showMessage('already loaded')
  return -- or closeCE()
end
writeStringLocal(l,"DO NOT LOAD")
showMessage('First one')


as long as one process is open with the shared memory object called "MyTrainer" it will exist. Once the last process with it closes, it gets destroyed as well


DB this is very slick. So simple. Cool
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