- ANGRY IP SCANNER VS NMAP HOW TO
- ANGRY IP SCANNER VS NMAP SOFTWARE
- ANGRY IP SCANNER VS NMAP CODE
- ANGRY IP SCANNER VS NMAP WINDOWS
ANGRY IP SCANNER VS NMAP WINDOWS
Since we just learned how threading in console applications vs windows forms is dealt with differently, this may be why it didn’t work as expected in the latter case. MSDNīased on these method descriptions, it appears that SendAsync() does not guarantee asynchronous operation. Ping.SendPingAsync(): Sends an Internet Control Message Protocol (ICMP) echo message to a computer, and receives a corresponding ICMP echo reply message from that computer as an asynchronous operation. Ping.SendAsync(): Asynchronously attempts to send an Internet Control Message Protocol (ICMP) echo message to a computer, and receive a corresponding ICMP echo reply message from that computer.
Time for a bit of research! Digging Deeper: A Battle of Asynchronous Pingsįor some reason that can only be to confuse inexperienced programmers like myself, there are two different asynchronous ping methods in this class.
ANGRY IP SCANNER VS NMAP CODE
Hm, turns out this problem wasn’t as easy as copying and pasting random code off the internet. In a console app however, the PingCompleted event will be raised on a ThreadPool thread. So it tries to raise the event on the main thread, but that can’t work since the main thread is blocked with the countdown.Wait() call. The problem is that the Ping class makes a best effort to raise the PingCompleted event on the same thread that calls SendAsync(). Winforms has a synchronization provider whereas console apps do not. According to Hans Passant from another Stack Overflow thread, the additional UI thread is the culprit: Lesson learned: Console applications and Windows Forms are different beasts and deadlocks occur with the above code. TimeSpan span = new TimeSpan(sw.ElapsedTicks) Ĭonsole.WriteLine( "Took failed. P.PingCompleted += new PingCompletedEventHandler(p_PingCompleted) However, upon copying the code into Windows Forms, it didn’t seem to work. Instead of using the synchronous Ping.Send(), it harnessed the asynchronous Ping.SendAsync() along with the CountdownEvent class in System.Threading. His console application worked wonderfully and was written in C#, which was great news since I was developing the application using Windows Forms. Thanks to Tim Coker, I thought I was mostly done my application already (knowledge is half the battle, right?). And the search continues… Second Attempt: Jaime LAN-nister, PingslayerĪ few more Googles later and I had what seemed to be the golden solution. Unfortunately, scanning 255 IP addresses this way will be excruciatingly slow (for both the developer and end user). In practice, it seems that ~500ms is about the fastest threshold that can be set. When specifying very small numbers for timeout, the Ping reply can be received even if timeout milliseconds have elapsed. Although Ping.Send has an overload to accept a timeout interval, it appears that setting very low values doesn’t actually change much.
This is great if we only had a few addresses to ping, because unfortunately this method is unacceptably slow for a user waiting to see if any devices are found. Using the namespace, we can easily use the Ping.Send() command to check if a remote address is alive. The Development First Attempt: Some-ping SimpleĪ quick Google search showed that pinging addresses is dead easy in C#.
ANGRY IP SCANNER VS NMAP SOFTWARE
Also if you’re a software engineer reading this, please go easy on my code. The following post outlines the things I tried before arriving to a working solution, which hopefully is at least mildly interesting and/or educational. However, despite this being a relatively well known objective with well-known libraries to accomplish it, my journey to developing a solution was not as easy as I originally thought. Since Google and Stack Overflow are my two best friends, I was able to find (what seemed to be) an off-the-net solution quite quickly.
In my most recent adventures to software land at MistyWest, I needed to write an application in C# that involved doing a ping sweep to find devices that were physically connected through ethernet.
ANGRY IP SCANNER VS NMAP HOW TO
As a mechatronics engineer (in training), sometimes I like to pretend that I also know how to program.
0 kommentar(er)
