Show a previous instance of app running in system tray
in [Visual Basic]
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From: Norm on 22 Apr 2010 22:12 "Karl E. Peterson" <karl(a)exmvps.org> wrote in message news:urFIeOk4KHA.620(a)TK2MSFTNGP02.phx.gbl... > Norm wrote: >> I have an app that runs in the system tray and you click on the icon to >> use functions within the app. Occasionally I have noticed that for some >> reason the app is running but no icon is showing in the system tray, >> which means you cannot access the app. > > Presumably, you're putting it there properly, using subclassing to monitor > window messages, right? If so, you also need to watch for this one: > > ' Registered message sent when Explorer (re)creates taskbar > Private Const TaskbarCreatedString As String = "TaskbarCreated" > > ' Determine value for "new taskbar" message. > m_msgNewTaskbar = RegisterWindowMessage(TaskbarCreatedString) > > When you get it, just recreate your taskbar icon with another call to > ShellNotifyIcon. > >> When I start a new instance of the app it tells me that the app is >> already running and then shuts down the new instance. I have tried the >> following code, but since the app is only running in the system tray I >> cannot show the app. >> >> Is there a better way to do this so that I can get the apps icon to >> appear in the system tray? > > IF the disappearance is not related to Windows recreating the taskbar, > you'll have to send a message to the previous instance when it's found, > and tell it it needs to recreate its notification icon. I'm betting the > first trick will do it, though. > > -- > .NET: It's About Trust! > http://vfred.mvps.org > > Karl, Nobody, Thanks for the information I will play around with both of those and see what I come up with. It does not happen very often, but I seem to be able to cause it by using task manager to stop the explorer process. Not very elegant, but usually when you do this not all the icons will be displayed when explorer restarts. I probably did not explain this very well, but the problem does seem to be related to explorer having a problem and restarting. I do have all the icons displayed on my taskbar, none of them are hidden. It may be awhile before I get back, I have been playing around with trying to make a CD to run all my old dos floppies off of. Thanks, Norm
From: Karl E. Peterson on 26 Apr 2010 16:45 Norm wrote: > "Karl E. Peterson" <karl(a)exmvps.org> wrote... >> Norm wrote: >>> I have an app that runs in the system tray and you click on the icon to >>> use functions within the app. Occasionally I have noticed that for some >>> reason the app is running but no icon is showing in the system tray, which >>> means you cannot access the app. >> >> Presumably, you're putting it there properly, using subclassing to monitor >> window messages, right? If so, you also need to watch for this one: >> >> ' Registered message sent when Explorer (re)creates taskbar >> Private Const TaskbarCreatedString As String = "TaskbarCreated" >> >> ' Determine value for "new taskbar" message. >> m_msgNewTaskbar = RegisterWindowMessage(TaskbarCreatedString) >> >> When you get it, just recreate your taskbar icon with another call to >> ShellNotifyIcon. > > Thanks for the information I will play around with both of those and see what > I come up with. It does not happen very often, but I seem to be able to cause > it by using task manager to stop the explorer process. Not very elegant, but > usually when you do this not all the icons will be displayed when explorer > restarts. > > I probably did not explain this very well, but the problem does seem to be > related to explorer having a problem and restarting. Yeah, that's what I thought, from your description. In that case, watching for that TaskbarCreated message is *exactly* what you need to do. When you get that, just recreate your icon. :-) -- ..NET: It's About Trust! http://vfred.mvps.org
From: Norm on 27 Apr 2010 01:33 "Karl E. Peterson" <karl(a)exmvps.org> wrote in message news:eC$$kFY5KHA.4888(a)TK2MSFTNGP06.phx.gbl... > Norm wrote: >> "Karl E. Peterson" <karl(a)exmvps.org> wrote... >>> Norm wrote: >>>> I have an app that runs in the system tray and you click on the icon to >>>> use functions within the app. Occasionally I have noticed that for some >>>> reason the app is running but no icon is showing in the system tray, >>>> which means you cannot access the app. >>> >>> Presumably, you're putting it there properly, using subclassing to >>> monitor window messages, right? If so, you also need to watch for this >>> one: >>> >>> ' Registered message sent when Explorer (re)creates taskbar >>> Private Const TaskbarCreatedString As String = "TaskbarCreated" >>> >>> ' Determine value for "new taskbar" message. >>> m_msgNewTaskbar = RegisterWindowMessage(TaskbarCreatedString) >>> >>> When you get it, just recreate your taskbar icon with another call to >>> ShellNotifyIcon. >> >> Thanks for the information I will play around with both of those and see >> what I come up with. It does not happen very often, but I seem to be able >> to cause it by using task manager to stop the explorer process. Not very >> elegant, but usually when you do this not all the icons will be displayed >> when explorer restarts. >> >> I probably did not explain this very well, but the problem does seem to >> be related to explorer having a problem and restarting. > > Yeah, that's what I thought, from your description. In that case, > watching for that TaskbarCreated message is *exactly* what you need to do. > When you get that, just recreate your icon. :-) > > -- > .NET: It's About Trust! > http://vfred.mvps.org > > Thanks Karl, I will be trying that in a few days, I am still playing around with trying to create a bootable CD that will give the message to hit any key to boot from CD and then have available all the utilities that I used to use from DOS, which will allow me to archive a whole lot of floppy disk's. :-) Norm
From: Nobody on 27 Apr 2010 07:36 "Norm" <NormF4(a)spoof.com> wrote in message news:29D06F1F-0CB9-4B1F-90BB-84450C34FE97(a)microsoft.com... > Thanks Karl, I will be trying that in a few days, I am still playing > around with trying to create a bootable CD that will give the message to > hit any key to boot from CD and then have available all the utilities that > I used to use from DOS, which will allow me to archive a whole lot of > floppy disk's. :-) Off topic: You can use the free MS Virtual PC and install DOS on it so you don't have to reboot to test a bootable CD. It supports ISO files, so there is no need to burn CD's, it also includes BIOS and you can change the boot sequence, just like if you had a second PC. http://www.microsoft.com/windows/virtualpc/default.mspx http://en.wikipedia.org/wiki/Windows_Virtual_PC
From: Norm on 27 Apr 2010 12:00
"Nobody" <nobody(a)nobody.com> wrote in message news:OqXt53f5KHA.4740(a)TK2MSFTNGP06.phx.gbl... > "Norm" <NormF4(a)spoof.com> wrote in message > news:29D06F1F-0CB9-4B1F-90BB-84450C34FE97(a)microsoft.com... >> Thanks Karl, I will be trying that in a few days, I am still playing >> around with trying to create a bootable CD that will give the message to >> hit any key to boot from CD and then have available all the utilities >> that I used to use from DOS, which will allow me to archive a whole lot >> of floppy disk's. :-) > > Off topic: You can use the free MS Virtual PC and install DOS on it so you > don't have to reboot to test a bootable CD. It supports ISO files, so > there is no need to burn CD's, it also includes BIOS and you can change > the boot sequence, just like if you had a second PC. > > http://www.microsoft.com/windows/virtualpc/default.mspx > > http://en.wikipedia.org/wiki/Windows_Virtual_PC > > Nobody, That is exactly what I am doing, but as with regular software the virtual pc's do not always act the same as a real pc, since they are using what is now considered to be antique hardware. :-) I was playing around with extracting the boot sectors of CD's and making an ISO and then creating a CD that should have been bootable, but was not recognized by my Virtual PC, but when I accidentally left it in my regular PC when I shut down, it did boot into it. Thanks for the information though. Norm |