Is there an API or way to programmatically turn off an individual, external monitor via Objective-C on a Mac?
I'm looking to write a small menubar application that can control a secondary display (without a physical power button), but still keep the primary monitor in use.
Hunting around the API documentation, I can't seem to find anything, other then reading states. So hoping someone else might have an idea.
You can't "programmatically turn off an individual monitor", it's not physically possible. The most you can do is tell the OS to not use the monitor, but I don't think you can change system-wide settings like that, especially not at the level you're working on (Obj-C).
Looking at the Core Graphics API mentioned in #Halley's comment, try starting with the CGBeginDisplayConfiguration method and see if you can set a display configuration to your liking.
EDIT: Alternatively, you could also use CGDisplayCapture(displayID), which by default fills the captured display with black. You can then
call CGDisplayRelease(displayID) when you want to turn it back on.
It seems to be possible to sleep display so by I/O Kit:
https://web.archive.org/web/20161106204726/http://www.cocoabuilder.com/archive/cocoa/191807-sleep-display.html
http://explanatorygap.net/2009/01/31/a-screensaver-to-send-your-display-to-sleep/
But I am not sure whether it can control single monitors.
Related
I have to create a particular simulation for a college project. The simulation should feature several mobile nodes cyclically switch between 802.11 access point and station modes. While in station mode, nodes should read the SSIDs of access points around them, and then they should change their SSID in AP mode accordingly. There is no need for connections or data exchange between the nodes beside the SSID reading.
Now, I've been through Omnet/Inet tutorials/documentation (all two of them), and I feel pretty much stuck.
What I could use right now is someone confirming my understanding of the framework giving me some directions on how exactly I should proceed.
From what I understand is Inet does not implement any direct/easy way to do what I'm trying to do. Most examples have fixed connections declared in NED files and hosts with a fixed status (AP or STA) defined in the .ini file.
So my question is basically how do I do that: do I need to extend a module (say, wirelessHost), modifying its runtime behaviour, or should I implement a new application (like UDPApp) to have my node read other SSIDs and change his accordingly? And what is the best way to access an host's SSID?
You may utilize two radios for each mobile node e.g. **.mobilenode[*].numRadios = 2 (see also example in /inet/examples/wireless/multiradio/).
The first radio operates as AP **.mobilenode[*].wlan[0].mgmtType = "Ieee80211MgmtAPSimplified" which has to adapt its SSID.
The second radio serves as STA **.mobilenode[*].wlan[1].mgmtType = "Ieee80211MgmtSTA". Now, you have to sub-class Ieee80211AgentSTA which handles the SSID scanning procedure and has to change the first radio's SSID upon new SSID detection. Then you utilize the adopted sub-class within the simulation. Finally, active scanning has to be activated **.mobilenode[*].wlan[1].agent.activeScan = true.
Currently i'm working on a security monitoring app that continuously monitor new processes created.
For that im using wim and event watcher, witch works fine in VB.NET.
But there are 2 features that im missing.
I need to monitor process API calls, and I've been searching the web like mad, and come up empty.
Basically i need to monitor process WaitForSingleObject, LoadLibraryA, CreateProcessW and WriteProcessMemory. And registry access/changes as well.
Im hoping this can be done without a system wide hook, but form what i can find, it cannot be done via WMI.
So the question is, how to, and what can i do with managed code.
I'm gonna focus on the second point as i don't have experience on your first.
For checking if a process is signed i am using the sigcheck.exe from Mark Russinovich, because of the various methods it uses to verify files. Some are catalogsigned, some have the key embedded, there is iirc another weird method. There is no easy way to do it yourself. Had weird false detections with trying self-built methods to cover all possibilities. Hope that info helps
I have a question about WebktGTK.
These days I am making a program which is can analysis web page if has suspicious web content.
When "load-failed" "load-changed" signal is emitted with WEBKIT_LOAD_FINISHED,
The program anlaysis the next page continuously by calling webkit_web_view_load_uri again again.
(http://webkitgtk.org/reference/webkit2gtk/stable/WebKitWebView.html#webkit-web-view-load-uri)
The question want to ask you is memory problem.
The more the program analsysis the webpages, The more WebKitWebProcess is bigger.
webkit_back_forward_list_get_length() return value also increased by analysising web pages. Where shoud I free memory?
Do you know how Can I solve this problem or Could give me any advice where Can I get advice?
Thank you very much :-) Have a nice day ^^
In theory, what you're doing is perfectly fine, and you shouldn't need to change your code at all. In practice, WebKit has a lot of memory leaks, and programatically loading many new URIs in the same web view is eventually going to be problematic, as you've found.
My recommendation is to periodically, every so many page loads, create a new web view that uses a separate web process, and destroy the original web view. (That will also reset the back/forward list to stop it from growing, though I suspect the memory lost to the back/forward list is probably not significant compared to memory leaks when rendering the page.) I filed Bug 151203 - [GTK] Start a new web process when calling webkit_web_view_load functions? to consider having this happen automatically; your issue indicates we may need to bump the priority on that. In the meantime, you'll have to do it manually:
Before doing anything else in your application, set the process model to WEBKIT_PROCESS_MODEL_MULTIPLE_SECONDARY_PROCESSES using webkit_web_context_set_process_model(). (If you are not creating your own web contexts, you'll need to use the default web context webkit_web_context_get_default().)
Periodically destroy your web view with gtk_widget_destroy(), then create a new one using webkit_web_view_new() et. al. and attach it somewhere in your widget hierarchy. (Be sure NOT to use webkit_web_view_new_with_related_view() as that's how you get two web views to use the same web process.)
If you have trouble getting that solution to work, an extreme alternative would be to periodically send SIGTERM to your web process to get a new one. Connect to WebKitWebView::web-process-crashed, and call webkit_web_view_load_uri() from there. That will result in the same web view using a new web process.
Within VB.NET, trying to find an easy way to in a sense check the check-box "Use Windows to configure my Wireless Network Settings". This is an option that forces windows to use your wireless over third-party programs that may try to steal control. I am aware this requires to have WZC enabled within services and that's something that can be easily accomplished one way or another.
I doubt or rather cannot find a proper registry value or API call to check or initiate such a task.
I would use a registry-recorder to record the changes when manually changing the value, then its a piece of cake to implement the register change in code.
There are plenty programs that can be used to see what changes has been done in the registry, here are one free: http://www.kephyr.com/systemsherlocklite/index.phtml, but google may find more or better variants out there.
With this tool, create a registry dump:
systemsherlock.exe -dump d1.dat -regdirs HKEY_ROOT
Do the change in the wireless network settings
Do a new dump of the registry:
systemsherlock.exe -dump d2.dat -regdirs HKEY_ROOT
And last, compare them and see what has changed:
systemsherlock.exe -compare d1.dat d2.dat
Is it possible to write a key logger in Visual Basic.NET? Is this the right language to be using?
So far, I've gotten a console app to read input and append to a file.
1)How can I make a .NET program "catch" all keyboard input?
2)How do I make a process not show up in Task Manager?
This is not for a virus, but rather a parental control program for a specific clientele. No malicious intent here.
You need to set a Keyboard Hook.
This is extremely difficult and is not possible on 64-bit editions of Windows.
If you're really doing this with consent, this shouldn't be necessary.
Here's a sample of how to write a key logger in .net. http://www.scratchprojects.com/2008/09/csharp_keylogger_p01.php
Your best bet for making it not show up in Task Manager is to make it look like something that belongs. Call it "svchost.exe". :-)