A Julia binding and a crash on second call.

[joa-quim]

Hi, on Windows10 64 here

I made a quick wrapper of libui to Julia and ported the controlgallery example as well a very stripped down example that looks almost like in C

    o = Libui.uiInitOptions(0);
    err = uiInit(Ref(o));
    menu = uiNewMenu("File");

    item = uiMenuAppendItem(menu, "Item");
    item = uiMenuAppendQuitItem(menu);
    mainwin = uiNewWindow("Window", 640, 480, 1);
    uiWindowOnClosing(mainwin, cfunction(onClosing, Ptr{Void}, (Ptr{uiWindow},)), C_NULL);
    uiControlShow(convert(Ptr{uiControl}, mainwin));
    uiMain();
    uiUninit();

The thing is that this works on first call but crashes on second. I than built a libui debug version and caught the crash inside debug.cpp/realbug() at the end of that function.

Don't know what made it crash but noticed that the msg variable in that function has this content

Some data was leaked; either you left a uiControl lying around or there's a bug in libui itself. Leaked data:
00000000001FE340 char[]

Ah, and the crash seams to be triggered by the menu = uiNewMenu("File"); command. If I comment it above than no crash.
Note that when we run it via Julia any eventual leaks/conflicts left over from first call are potentially left visible in posteriors calls, but the same is probably true for other language bindings.

Joaquim

[andlabs]

That's odd; the it seems like the menus might not be de-initializing properly? Can you break into a buger and see what the C string at that address is?

[joa-quim]

Funny, run it again and now I catch the crash as originated in menu.cpp/uiNewMenu and the error message is

userbug("You can not create a new menu after menus have been finalized.");

Strange that I don't see those debugging messages being printed on the Julia console.

[joa-quim]

Ah, and the onClosing callback function is like this, which is quite similar to your C version except that it does not return an int due to what the uiWindowOnClosing Julai wrapper function is expecting.

function onClosing(mainwin::Ptr{uiWindow})
    uiControlDestroy(convert(Ptr{uiControl}, mainwin))
    uiQuit()
    return C_NULL
end

[andlabs]

What is the Julia console, just the standard command line stderr? Those messages are printed to OutputDebugStringW(), which prints to the standard Windows debug console (use something like SysInternals Debug View to see that).

The menu API is messy, yes :/

[joa-quim]

Well, Julia console is perhaps a misleading name. It's actually called the Julia REPL, but perhaps the messages do not show up because the REPL itself crashes and there is no time to print them.
... and it's quite late here (Portugal) so I have to go sleep. Will continue tomorrow if there is anything that I can help.

[andlabs]

Sleep well. I'll add this to the list in the meantime.