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Open file into an already running program

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  • 4 Offline
    4 Offline
    4oh4
    wrote on last edited by
    #1

    I've got a program setup to work with file opens (eg, movie.avi -> rightclick -> open with -> myprogram.exe) by reading the command line args when the program starts...

    doesn't seem to extend to a way to open a file into the running instance of a program if i 'open with' while the program is already running, it just opens another copy of that program.

    Does QT have a standardised way to handle this?

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    • hskoglundH Offline
      hskoglundH Offline
      hskoglund
      wrote on last edited by
      #2

      Hi, I had a similar problem, when a 2nd instance of my program is launched, I exit that and switch focus back to the 1st instance.

      I solved it by using the QSharedMemory class in Qt to communicate between the 2 instances of the same .exe file.

      4 1 Reply Last reply
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      • Christian EhrlicherC Offline
        Christian EhrlicherC Offline
        Christian Ehrlicher
        Lifetime Qt Champion
        wrote on last edited by
        #3

        See QtSingleApplication

        Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
        Visit the Qt Academy at https://academy.qt.io/catalog

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        • hskoglundH hskoglund

          Hi, I had a similar problem, when a 2nd instance of my program is launched, I exit that and switch focus back to the 1st instance.

          I solved it by using the QSharedMemory class in Qt to communicate between the 2 instances of the same .exe file.

          4 Offline
          4 Offline
          4oh4
          wrote on last edited by
          #4

          @hskoglund Thanks, finally got a chance to implement it and QSharedMemory was exactly what I needed <3

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