1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Does TCC have a hand in this?

Discussion in 'Support' started by vefatica, Feb 27, 2009.

  1. vefatica

    May 20, 2008
    Likes Received:
    I posted the article below in the PowerPro forum ... no replies yet. But I have to wonder if TCC has any part in this (I doubt it) and whether the few PowerPro users in this audience might have any idea what's going on.

    Below is my post to the PowerPro forum.

    I have a PowerPro button:

    Command: d:\tcmd9\tcc.exe
    Start: Hidden
    Parameters: /c start %@regquery["HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\9.0\ProjectMRUList\File1"]

    TCC.EXE is the second-latest version of what was the 4NT command interpreter. My PowerPro button effectively starts Microsoft's DevEnv with my last project active.

    But if there's already an instance of d:\tcmd9\tcc.exe running, and I click the PowerPro button, the running instance becomes hidden (and the desired task gets gone, so I suspect PowerPro is also starting a new, hidden, instance).

    Even stranger, if an instance of d:\tcmd10\tcc.exe, a newer version, is running, the same thing happens.

    I don't think TCC.EXE does any DDE (i.e., you can't give a command to an already running instance). So what's happening? Is PowerPro doing exactly what I said (starting a new instance) and, in the process, hiding every instance of any TCC.EXE it can find?

    In any event, how can I stop that?
  2. rconn

    rconn Administrator
    Staff Member

    May 14, 2008
    Likes Received:
    vefatica wrote:

    TCC does no DDE -- which doesn't work in a console app, nor does it
    check for previous instances. (TCMD does both.)

    Rex Conn
    JP Software
  3. vefatica

    May 20, 2008
    Likes Received:
    On Fri, 27 Feb 2009 19:25:35 -0600, rconn <> wrote:

    |TCC does no DDE -- which doesn't work in a console app, nor does it
    |check for previous instances. (TCMD does both.)

    I was pretty sure of that. And I told PowerPro not to try to use an existing
    instance. More testing shows PowerPro does as I said, starts a new hidden
    instanc (which does the correct thing). So the fault must be that it hides
    every instance of TCC.EXE it can find.

    - Vince
  4. vefatica

    May 20, 2008
    Likes Received:
    Further dialog (Bruce Switzer, author of PowerPro, then me):

    > If you are not using "switch-to-if-active", then I believe that all
    > PowerPro is doing is using the Windows system routine "ShellExecuteEx"
    > to run the command line; the hidden parameter is just passed onto this
    > routine which has an equivalent flag.
    > So as best I can tell what you are seeing is some kind of interaction
    > between the Windows system and tcc (which can sense other instances
    > and take action based on this as part of startup).
    > I am not sure what you are using tcc rather than just running the dev
    > environment or using Windows start command, but all I can suggest is
    > either starting a different way or using a PowerPro script to sense if
    > a tcc instance is running and then doing something different to start.

    I'm using TCC to dig out the last-used project from the registry (via
    TCC's @REGQUERY[] variable function) so DevEnv will automatically
    start with that project open. DevEnv itself, and the windows START
    command can't do that.

    I'm not using "switch to ...".

    I tried ShellExecuteEx() in a variety of ways in my own app and could
    not reproduce this behavior.

    Here's one anyone can try: when I changed the PowerPro button to use
    CMD.EXE to open an explorer window:

    Command: c:\windows\system32\cmd.exe
    Start: Hidden
    Parameters: /c start c:\

    I observed the same problem ... the hidden instance is created (does
    its job, exits) and an already-running instance of CMD is also hidden.

Share This Page