preventing double application launch

Put Claude · #1 (**permalink**) 10-02-2007, 10:55 AM

Hi,

Can 't find the way preventing a double application launch...
can you help me out...

Great forum guys, never get one like this, all my deep respects...

Put Claude Belgium

Erel · #2 (**permalink**) 10-02-2007, 11:40 AM

The .Net CF does (suppose to) prevent more than single instance.
How do you get more than one instance?

dzt · #3 (**permalink**) 10-02-2007, 12:09 PM

@Erel
I think, he is talking about desktop.

@Put
You can check your Form Title, and if it exists then quit the app.
You can do that using my dzHWdesktop.dll (latest version) posted here http://www.basic4ppc.com/forum/additional-libraries/384-useful-library.html

Code:

<font face="Courier New"><font color="#0000ff">Sub </font></font>Globals
<font color="#0000ff">End Sub
</font><font color="#0000ff"> 
Sub </font>App_Start
  dzhw.New1

<font color="#0000ff">  If</font> dzhw.GetWindowHandle(<font color="#800000">"null"</font>, <font color="#800000">"Form Title"</font>) > <font color="#800080">0</font> <font color="#0000ff">Then
</font><font color="#0000ff">    AppClose
</font><font color="#0000ff">  End</font> <font color="#0000ff">If
</font>  Form1.Show
<font color="#0000ff">End Sub
</font>

Put Claude · #4 (**permalink**) 10-02-2007, 02:52 PM

Hi,

Yes, did get 2 instance on Acer 300 WM5...
Noticed it when my gps-program counted every 2 seconds, I quit the program and get the underlying second same program that counts now every second, so... for some reason, the system did not prevent a second instance at same time.

dz,
did not find that in helpfile: dzhw.GetWindowHandle("null", "Form Title")

Made a little WF.exe in C (window find) that checks if my application already is open, so yes, bring it to front, and cancel the second launch.
My solution: Start this little exe with the shell function as first line in my application...

Put Claude Belgium