Qprocess-add commands to a running executable

[Milardo]

Hi,

If i have a .exe file running from that was started by QProcess commandProcess, how can I send additional commands to that running .exe file? Like if it was a media player that was playing some media (the .exe file) and I want to have a button on the gui pause it, what exact line of code could I use for that? Pause would be an argument probably. Thanks in advance.

[tbscope]

You use inter process communication.
There's a website about this on the qt documentation site.

Example: dbus or sockets

[e8johan]

The QProcess class can only send and receive information via stdin/out/err. You cannot use it to press buttons or such in another application.

[Milardo]

Can I get some complete examples? If I already have a exe file started by qprocess, what example code can I use to add additional commands or args to that exe file? Thanks

[Urthas]

I may very well be wrong here, but my understanding is that in order to "virtually" use a product (like a media player) that product has to expose an API. For example, Apple's iTunes API, which I have used to program a stripped-down iTunes interface in PyQt. I'd love to hear more about this however.

[tbscope]

http://doc.qt.nokia.com/4.6/intro-to-dbus.html

[Talei]

Although DBus is ATM available (at least officially) only on NIX, not on the windows - assuming that Milardo uses Windows and i.e. WMP.
Also I don't think (I can be wrong on this one) you can do what You want with QProcess either. If Your player don't support action like stop/pause/play from the CLI (this is really rare on win), then You can only (and again this is AFAIK, I can be wrong on this one) do a hook and override functionality directly.

For nix go with dbus.

[tbscope]

http://msdn.microsoft.com/en-us/libr...74(VS.85).aspx

You can always use sockets of course.

But indeed, if the program you want to interface with doesn't have a public api or doesn't expose an ipc option, then you don't have a lot to work with.

There is of course reverse engineering. You can always automate software from another one, but you need to use hooks.

[Milardo]

The exe program is gst-player.exe from gstreamer. It supports typing like pause, play from the command line. It is for windows os. If somebody can, please provide an example using dbus/sockets/hooks

[tbscope]

If the program accepts commands like that from any input then I guess you can just write "pause\n" or "play\n" to std out (for the environment where your process is running).

[Milardo]

Can you post an example of some code for that? That would be helpful thanks. I'm not that knowledgeable at programming but I do know some and I can learn fast.