Running code when Chrome "opens" on a mac - macos

I'm writing an extension that opens a tab when Chrome first runs, technically means placing code in the background page, which sounds simple enough, and works fine in Windows, and probably Linux as well, though I haven't tested it.
The problem is with Mac, which doesn't actually fully close Chrome when the user clicks the close button at the top left. To fully close Chrome you have to force quit it, which is something people generally do not do.
So this means I'll need to rely on some other event to trigger code when the user first "opens" chrome. Does anyone have idea for which even that could be? I suppose I could add a listener to every tab's create event and check the number of tabs, or something similar, but I'm looking for a light weight solution. Any ideas?
UPDATE: One idea us to use the chrome.windows.onCreated event and just check that there are no other windows open. Is that the best method, or can anyone think of something more efficient?

Use two events and a counter. Because window open/close are relatively rare, this should not be a problem:
onCreated, increase the counter, and validate the value.
onRemoved, decrease the counter.

Related

MFC: GUI freezes, but keeps working

I’ve encountered a problem I can’t solve.
I’m working on a project with MFC in Visual Studio. The problem is, sometimes GUI just stop visibly reacting, but technically it keeps doing the functions it was intended to do. It means, when I press a button, the function OnBnXXXPressed is executing, but the button doesn’t look like it was pressed, as if I’ve pressed on a picture of button, not the button itself. And it’s not just this button — every other element of GUI seems to keep working, but doesn’t show that it is working.
Also, in this state dialog windows don’t show up upon their call. If I call AfxMessageBox, the message box won’t show up, and the thread that called this function, will not be blocked; AfxMessageBox will basically be skipped.
I have absolutely no idea what can possibly cause that behavior. The question is: what should be happening in program for it to behave this way? Especially if it’s built with MFC?
The project consists of 50+ files, and every function responsible for GUI makes changes to the elements it is about. I do not know where the error is, and I ask you, to the very least, where should I look for it.
Thank you for attention!
The answer was originally provided in the comment section. My code indeed has a GDI resource leak that was provoking this behavior.
When a button is clicked, are you doing a bunch of processing, or do you return fast? If you don't return, maybe locking the UI thread. After a user presses on the button, how long is it taking before the OnClick for that finishes running?
If that's it, here's some more info: https://learn.microsoft.com/en-us/windows/desktop/Win7AppQual/preventing-hangs-in-windows-applications
The solution I've generally used for long-running logic on a UI click is to run it a background thread.

Getting memory leaks from Appcelerator Alloy app

I have an Alloy app. It has got 7 windows and opens at same time. When user close a opened window $.removeListener(); $.destroy(); codes runs at window close event. But I am getting memory leaks on Android device. %90 windows has got ListView, every window has got max 2 Listview. What is the right approach for multiple windows?
First of all, why you would want to open 7 windows at same time when user can only see max 1 window at a time.
It's dead simple, open only that window which user should see first, & create a link-flow to other window in previous window.
Can you think of any app on Play Store which does so, if you have, then please send me its link, I would really love to review it?
But if you mean to say that user will see all windows at same time in a scrolling behaviour or like paging, then go to Ti.UI.TabGroup
Are you 100% sure that your event listeners are being removed?
I don't know the function $.removeListener(); is this a custom function?
As a general rule I try and put as many of my event listeners into the xml, as these are automatically removed, and have a custom function destroyMe() that runs onClose which removes any other listeners that I may have used and $.destroy()
Ti.App.addEventListener is a killer too, make sure these are removed if you use them!
ps: i totally understand the 7 windows bit :-)

Replace special character with keyboard shortcut live on input

Is there any way to replace a special character with a keyboard shortcut live?
For instance: Writing $ would actually press ctrl+n or arrow key left
Every help is much appreciated!
This is primarily speculation with a little experience and research mixed in.
This sort of thing is easy enough if you are checking in an application that currently has focus, but creating a universal keypress hook? Not so much.
I built a C#/C++ program in grad school that intercepted keystrokes intended for another application, but I was only able to do it by waiting for the desired application window to open, auto-opening my own pop-up window to receive the input, and then passing keystrokes back to the original window.
I'm not saying it can't be done, period, but my background knowledge (though slightly dated) and a little cursory research isn't turning up anything in the basic scripting world that would satisfy what you appear to be after.
The only way I know how to do it (which is likely wrong) would be to have hooks in every open application, and when a textbox on the application gained focus give focus to your own text-receiving app. Analyze the keypresses, and then pass the desired text/keypresses on to the original app/textbox. This would require prior knowledge of the "windows" (i.e. all objects) in all possible apps on the machine you're working on, so you would know when a textbox received focus.
If I recall, it might be possible to tell when keys are being pressed (if you have hooks in all apps) and re-direct from there, but you might lose the first keystroke, even then.
Again, this is primarily speculative.

Visual studio extreme lag spikes while debugging

When Im debugging my app in VS2012 and it crashes, the input (mouse and keyboard) starts to lag extremely, the fps drops to about 0.3 or less and I can't even move my mouse without waiting 3 seconds... The only solution is to do Shift-F5 which will end the debugging, and everythng is fine then again.
Whats more interesting, the only lagging thing is the input, the whole background works perfectly fine, text caret is blinking at normal rate and tooltips are nicely animated when mouse gets over a button.
Im compiling the project with allegro 4.2 (I have to use it, it would take too long to explain why).
I have no extensions, a pretty fast pc which should be able to handle debugging...
Im interested in any solution, it may be dirty/hackish... I can of course provide more information if needed.
Thanks for any help.
EDIT: Reading through forums I found some information about the "Auto" window or something like that (don't remember exactly and can't find it anymore), which is doing some "background tasks" and that causes lags... Do you think running it on separate core would fix that?
A tale of multi-second stalls when hitting a breakpoint, related to the raw input API: http://the-witness.net/news/2012/12/finding-and-fixing-a-five-second-stall/ (archived)
It's a very long time since I last saw this sort of thing myself, but I seem to remember that the culprit in my case was DirectInput. (This makes some sense, given the tale above, as DirectInput has long been a wrapper over the raw input API.) And I think the solution was to use the emulated keyboard and mouse devices rather than the default ones, which you do this by passing in one of the emulated device GUIDs to IDirectInput8_CreateDevice. Discussed briefly here: http://msdn.microsoft.com/en-us/library/windows/desktop/ee416845%28v=vs.85%29.aspx
(I don't remember whether cooperative and exclusivity levels made a difference - it might be worth trying changing these too.)
I recently experienced the following similar issues while debugging a game:
Hit a breakpoint, halting the program for debugging.
Pressing any key now takes around 1 second to "process". It will be buffered and sent slowly one after another to whatever window is now active.
In my case, the application installed a low level keyboard hook with SetWindowsHookEx(WH_KEYBOARD_LL, ...). After removing this (for !NDEBUG builds only as you wish), the input lag was gone.
I suppose the hook cannot respond at all while your application is halted, and eventually the system skips it after a timeout, which length can be configured in milliseconds under HKEY_CURRENT_USER\Control Panel\Desktop\LowLevelHooksTimeout:DWORD as mentioned here. In fact, the link in the accepted answer mentions this issue, but I thought I explain the core of it right here, also because the link went dead before I fixed it.
Try to find such a hook in your application or dependencies, and check if removing it helps. Since you mentioned this happens to your mouse too, check for a (low level) mouse hook (WH_MOUSE_LL) aswell. The available hooks are listed on MSDN.

Using PostMessage in Windows Mobile to simulate a menu pick

I'm writing a routine to provide user definable keyboard short-cuts for any menu item in my Windows Mobile 5 application, which is in C++/MFC. To do this I am getting all of the available menu command IDs, and using the CWnd::PostMessage(WM_COMMAND,MyMenuID) to post it to the application. I use this technique to good effect elsewhere for inter-thread comms, but not with menu command IDs. Any ideas why this doesn't work. The app is document view, and I have tried posting to the CMainFrame and CView derived windows. I could write a god awful switch statement but I feel posting a message should work.
Edit: Ok, i've tried a number of things, including suggestions from this post, to no avail. Big ugly switch statement it is for now, I'll update again if i find anything better.
The only reason I can think of is the message is going to the wrong window. Don't forget that not all menu commands are always processed by a particular window. Some menu commands like Cut are usually processed by a view window. Others are processed by frame windows and some possibly by the application object.
Hope this helps.

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