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monitoring my application if is open or not.

Posted on 2006-07-04
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Last Modified: 2010-04-05
so, I'm trying to build a application to my cybercafe, so I have a client application in my clients computer, but sometimes happening that, somebody try to close this client application to denny my server to monitoring this machine.

what I want to do is create other application that monitoring this client application if is open or not, if is not then open it.
by the way, this application have to be hide from taskbar.

this way, my clients is not going to be abble to denny my application to close the pc when him time is done. So they have to pay for more time.
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Question by:rafaelrgl
8 Comments
 
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Expert Comment

by:TheRealLoki
Comment Utility
what about making your monitoring application a service instead?
it's less obvious, and unless the logged on user has the rights, they cannot close it
at the very least, you could make your "check if my app is running" a simple service, thatruns your app if it is not running.
(much like the Firebird Guardian Service and Interbase Guardian services do)
all you would need to do for example is :-
if FindWindow('TfWMonitorApplication', 'Cyer monitor') = nil then
  winexec('c:\myapp.exe'); // runi t because it is not running

1 other method would be to not let your application close
e.g you need a password to close it

in the Form's "OnCloseQuery" event you could add
CanClose := (inputbox('Close', 'Password', '') = 'secret');

you would then just need to catch the wm_queryendsession message so that windows could close your app if it needed to shut down.
but if you manually close the machines down you can just enter the password
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Author Comment

by:rafaelrgl
Comment Utility
if FindWindow('TfWMonitorApplication', 'TEST') = nil then
begin
   showmessage('program is not running');
end;

I try to do like this above and show this error:   Operator not applicable to this operand type
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Expert Comment

by:TheRealLoki
Comment Utility
sorry
if FindWindow('TfWMonitorApplication', 'TEST') = 0 then
...
it returns a handle
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Author Comment

by:rafaelrgl
Comment Utility
well, my application on trayicon and hide. When I try to test the function if my application is open or not, the function shows the message, something is wrong.

if FindWindow('TfWMonitorApplication', 'TEST') = 0 then
begin
   showmessage('is running');
end;
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Assisted Solution

by:TheRealLoki
TheRealLoki earned 200 total points
Comment Utility
ahh ok, because it is hidden you will need to look for it another way

try this

function IsProcessRunning(ExeFileName: string): boolean;
    const
        PROCESS_TERMINATE=$0001;
    var
        ContinueLoop: BOOL;
        FSnapshotHandle: THandle;
        FProcessEntry32: TProcessEntry32;
    begin
        result := False;
        FSnapshotHandle := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
        FProcessEntry32.dwSize := Sizeof(FProcessEntry32);
        ContinueLoop := Process32First(FSnapshotHandle, FProcessEntry32);
        while (not Result) and (integer(ContinueLoop) <> 0) do
        begin
            if (StrIComp(PChar(ExtractFileName(FProcessEntry32.szExeFile)), PChar(ExeFileName)) = 0)
              or (StrIComp(FProcessEntry32.szExeFile, PChar(ExeFileName)) = 0)  then
                Result := True;
            ContinueLoop := Process32Next(FSnapshotHandle, FProcessEntry32);
        end;
        CloseHandle(FSnapshotHandle);
    end;

procedure TForm1.Button1Click(Sender: TObject);
    begin
        if IsProcessRunning('Notepad.exe') then ShowMessage('yes'); // replace notepad.exe with the path and filename of your tray application
    end;
0
 
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Author Comment

by:rafaelrgl
Comment Utility
Build
  [Error] FrmMonitor.pas(34): Undeclared identifier: 'TProcessEntry32'
  [Error] FrmMonitor.pas(37): Undeclared identifier: 'CreateToolhelp32Snapshot'
  [Error] FrmMonitor.pas(37): Undeclared identifier: 'TH32CS_SNAPPROCESS'
  [Error] FrmMonitor.pas(38): Missing operator or semicolon
  [Error] FrmMonitor.pas(39): Undeclared identifier: 'Process32First'
  [Error] FrmMonitor.pas(42): ')' expected but identifier 'szExeFile' found
  [Error] FrmMonitor.pas(60): Record, object or class type required
  [Error] FrmMonitor.pas(62): 'END' expected but end of file found
 
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Accepted Solution

by:
CodedK earned 300 total points
Comment Utility
Hi... TheRealLoki  why "TfWMonitorApplication" ? (This is the handle for Mozzilla ?)

FindWindow(class name : string, window name : string)

So because you dont have the handle just do this:

if  FindWindow(nil, 'The caption of your application')=0 then
run it.... (with ShellExecute or winexec)


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LVL 12

Expert Comment

by:AmigoJack
Comment Utility
you could use code injection to prevent any application from being closed. but thats rather a bomb and should be handled very carefully. do you compile your "watching software" yourself or is it a third party one?

another way to solve the problem is the question "HOW do the users kill your program"? you can disable taskmanagers, only few people know the commandline...
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