Alex Hall wrote: > > Anyway, onto the problem. I am working on a simple resource monitor (I > have never found one that works well with screen readers, so I am > writing one). I am using python2.6 with all the win32 libs installed. > My monitor will use wmi to get all of its information, and it was > going pretty well until a few hours ago, when I started receiving > seemingly random errors. I can call my functions, such as getFreeRam > or getLoad, with no problem as long as the call is hard-coded into the > script. However, when I try to call said functions from a function > monitoring keyboard input (using pyHooks), I get an error and the > program crashes (at least it did until I put a try/except in there, > but hitting the hotkey over and over always gives me an error).
Windows hooks run in a unique environment. When you install a Windows hook, you are actually injecting a DLL into every process in the system. (It's not a low overhead operation!) The code in the keyboard hook runs as part of another processs. Now, I have not looked into the pyHooks code to see if they are managing that, by using some kind of inter-process communication. If they are not, then you are very limited in what you can do in your callback. "print" wouldn't work, because that process has a different standard output. You would need to send a signal back to your own process. Further, COM will not have been initialized in that other thread, so you wouldn't be able to use a COM object, like "Say.Tools". You can try calling pythoncom.CoInitialize() in every callback, I suppose. > I will paste the entire file below. It is not very commented yet, so > if something does not make sense, please let me know. My questions are: > > 1. Why am I getting these errors? What errors do you get? I don't think you told us that. > 2. The getLoad function only returns one number (the counter is there > to double check that the loop really only runs once). I have a dual > core AMD, so I expected two numbers, a LoadPercentage for each core, > not just one number. How do I get the load per core, not per physical > processor? Well, it only returns one value because you overwrite the value of "load" every time through the loop. If you want to return multiple values, you should add each new value to a list, and return the list. > 3. Regarding pyHook: I press my win-` hotkey on the desktop and get > something to happen in my script, which is good. However, I also get a > Windows error sound. Is there a way to grab that keystroke before > Windows can get it to avoid what seems to be passing the keystroke to > the active app before my script can get it? I tried returning False in > my keyUp function but that made no difference. This shouldn't be an issue. The hotkeys are handled by Explorer, which sucks up the key after it launches your program. I don't understand who would trigger the sound. -- Tim Roberts, t...@probo.com Providenza & Boekelheide, Inc. _______________________________________________ python-win32 mailing list python-win32@python.org http://mail.python.org/mailman/listinfo/python-win32
