Linux message handling?

[DJMaze]

Ok i'm moving to cross-platform coding but i have a question.

In Windows i use PostMessage() and SendMessage() to put a message in the queue for processing.
Is there something similar for X ?

[DJMaze]

i think i got it.
Windows API uses GetMessage() the X API uses XNextEvent().

Am i correct?

[DJMaze]

LOL i am correct and the systems are way different.

Win32 has PeekMessage() and so does Xlib, but Win32 returns 0 and stops where Xlib blocks and waits for the next message to occure.

So to get the same effect as Win32 we must use something like:

PHP Code:

int ProcessQueue()
{
#ifdef WIN32
    MSG message;
    while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE) > 0)
    {
        if (MSG.message == WM_QUIT) { return 0; }
        TranslateMessage(&message);
        DispatchMessage(&message);
    }
#else
    XEvent message;
    while (XEventsQueued(display_connect_id, QueuedAfterReading))
    {
        XNextEvent(display_connect_id, &message);
        MyMessageHandler(message);
    }
    return 1; // all messages handled
#endif
} 


just my $0.02

[teknomage1]

Do you have the option of using a cross platform toolkit like Qt to make things easier?

[DJMaze]

I've tried many including wxWidgets, FLTK and GTK but they will not work for my application.

The issue is that i'm rewriting my music player and it allows to have trayicon and is multi-threaded to prevent racing since some graphical interfaces use heavy painting.
I know multi-threaded applications are in most people their eyes cumbersome and have no real benefit on single CPU's, but on multiple cpu's this is realy great.
Thanks to the multi-threading it also allows me to properly implement video playback over several monitors.

None of the toolkits properly provide me these powers unless i hack the source and recompile the library.

Secondly most widgets used in the toolkits are not used by my application so a 10MB library like wxWidgets is just nuts (unless i compile it staticaly)

My application is also used by many dj's, amusement parks and pubs. It would be nuts to make a less-stable system.
Although FLTK is rock solid and lightweight, it is missing some stuff i need and has default actions i don't want.

That's why i write my own toolkit

[teknomage1]

Fair enough, I was just impressed by Qt's write once/compile most places ease of use. It looks like you're working on something a bit slimmer though.

[AssKoala]

Originally Posted by DJMaze

I know multi-threaded applications are in most people their eyes cumbersome and have no real benefit on single CPU's, but on multiple cpu's this is realy great.

Completely and totally untrue (the bolded part). If a thread blocks on I/O, other threads can execute for the process (assuming you wrote a halfway decent application and you aren't using an OS with a crap scheduler (e.g. Linux pre-2.6 scheduler)).

Good luck with your app, though I thought you could get tray icons with Qt, just by switching to a different execution path depending on the OS.

[DJMaze]

ehm it was ment as:

in most people their eyes: "cumbersome and have no real benefit on single CPU's"

english is not my first language

Originally Posted by AssKoala

Good luck with your app, though I thought you could get tray icons with Qt, just by switching to a different execution path depending on the OS.

Correct, so does wxWidgets.
I do have them all installed since X programming is new to me or else i get realy lost. But for now these toolkits don't benefit my work like i want it.

Googling for "convert win to x" and many more just results in nothing worthwhile to read so i'm digging thru all code and slowly find my way.
Posting questions in here and finding the answers myself is ok in my opinion since it will also help others with the same troublesome.
When we all gathered enough info about the differences in both API's and how to handle/convert code codenewbie could become a great asset for many coders including all the software companies that still only write software for crappy Windows since 80% is still on windows.