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Don't let twice running

Dear Experts

I wanna write an application if it runs, and user run it again (click on it icon), it doesn't create again and just show previous application as some programs, for example winamp, word and .... u cann't run winamp twice.it should check if it has runned previousely, don't run again
PLZ help me.

Regards

ASKER CERTIFIED SOLUTION

sun4sunday

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sun4sunday

also check the PAQ answerd

https://www.experts-exchange.com/questions/21653129/I-need-a-function-to-check-if-my-program-is-already-open.html

sun4sunday

Wim ten Brink

TJvAppInstances from the Jedo components (http://homepages.borland.com/jedi/jvcl/) will allow you to limit your application to a specific number of instances. It will also activate the running process if required and is just the simplest way. It also provides you some additional functionality that you might like to use. For example, it can transfer the commandline parameters from the second process to the first one.

Kyle Foster

Not sure where I downloaded this freeware control.

ADP Instance control. Just drop it on the main form and tell it how many instances are allowed.

www.certss.com\downloads\expertexchange\adp.zip

saravananvg

Hello Sir,

You could do as follows.

program Project1;

uses
Windows, Messages, Forms,
Unit1 in 'Unit1.pas' {MainWindow};

{$R *.res}

begin
if CreateMutex(nil, true, 'MyAppIsAlreadyOpened') <> 0 then
if GetLastError = ERROR_ALREADY_EXISTS then begin
// app is already opened
SetForegroundWindow(FindWindow('TMainWindow', 'MainWindow'));
end else begin
// app is not opened
Application.Initialize;
Application.CreateForm(TMainWindow, MainWindow);
Application.Run;
end;
end.

with regards,
padmaja.