|
I am working with an equipment that only can be configuration through local Network! It use SNMP protocol (with UDP for parsing data). Anyone knows how to work with it? 
Note: I did try the ServerSocket_Demo in this site, but it not the same. Because it only try to send information in TCP (or UDP) ... but not in SNMP. The result is: The equipment rejected both ways
Thanks to any help 
|
|
|
|
|
|
I have learned about it, but the problem for me now is: Even I understand smome thing about it:
. Packet Info: (ie: packet length ...)
. Ethernet - II (ie: IPv4)
. IP (ie: version, source, destination, protocol ... checksum)
. UDP (ie: source, destination, protocol ... checksum)
. Extra data (...)
. FCS (...)
I still does not know how to imply in my VC++ program in order to link correctly with the equipment (Send/Receive SNMP packets)
Can you help?
|
|
|
|
|
I have never used the protocol but since it works over tcp/ip I would imagine you can send/recv
SNMP packets using sockets.
Do you need to know how to use sockets from C++?
Mark
|
|
|
|
|
In VC++ ... yes, if it can send SNMP packets as I described
Thanks
|
|
|
|
|
It looks like you have some studying to do...
Windows Sockets 2[^]
Maybe look around MSDN or Google and see if there's higher-level APIs or libraries for working
with SNMP. EVerything you need to know is documented somewhere 
|
|
|
|
|
Hi Mark,
Thanks for the usefull links. I will work on it immediately 
|
|
|
|
|
Ive been using Sleep() alot, but now i need something with smaller units, like microseconds or something. Ive used while loops that count a couble hundred, but there must be some more cpu friendly way to sleep a few microseconds?
any ideas?
maybe i could use timer? does it go down to that unit? if so how would i use that?
thanks
/Johannes
/Johannes
|
|
|
|
|
Johpoke wrote: Ive been using Sleep() alot...
Why? What is it about your application that requires the (over)use of this function?
"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15
"Judge not by the eye but by the heart." - Native American Proverb
|
|
|
|
|
Look up "Multimedia timers" in MSDN for more high-resolution timers. But I agree with DC's post... It might be worth looking into why you are using Sleep(...) so much. Excessive use of Sleep(...) is often (although not always) a sign of a larger problem.
Peace!
-=- James
If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
DeleteFXPFiles & CheckFavorites (Please rate this post!)
|
|
|
|
|
My program draws fireworks, no sleep and they whiiiz by abit fast,
Ille look into the multimedia timers!
thanks
/Johannes
|
|
|
|
|
Work out how much time has passed since your last frame, then you can scale up your animation to update accordingly
|
|
|
|
|
Um?
it uses SetPixel for everything..
/Johannes
|
|
|
|
|
You need to correctly use loops, timers and counters.
It sounds like you are doing all of your drawing directly to the screen, and you have an uncontrolled loop, you should instead be trying draw to an offscreen bitmap. Set a timer, on each timer event bitblt the bitmap to the screen.
|
|
|
|
|
WalderMort wrote: ...you should instead be trying draw to an offscreen bitmap.
Hey, wait a sec. Didn't you state not too long ago that double buffering "is for little girls" or
something like that? 
Cheers!
|
|
|
|
|
oh.. err... mm...
NO, that was Voldemort, my evil twin 
|
|
|
|
|
Mark Salsbery wrote: double buffering "is for little girls"
|
|
|
|
|
well the loop is kinda controlled, but i came up with a way to fix it, i do the sleep(1); less often, every fourth time..
but now i have another problem, i created a second thread, and both main and the second thread generate exactly the same random numbers using rand()%1000, how can i get a more random random??
lol :P
/Johannes
|
|
|
|
|
You have to seed the random number generator with a random number. Use GetTickCounts or something like that. Otherwise, they always start out the same, so that you can actually 'test' the generator.
|
|
|
|
|
hu??? how?? wht? GetTickCounts?
:/
/Johannes
|
|
|
|
|
the common method is to seed the random number generator with the number of seconds elapsed since 1970 or something, can't remember exactly. Anyway use the time() function which returns this number and pass it directly into the srand() function.
srand( (unsigned)time( NULL ) );
|
|
|
|
|
Before using rand() in either thread, call this, straight from MSDN:
srand( (unsigned)time( NULL ) );
You should NOT be getting same random value sequences from each thread, then.
I just sometimes do this:
srand( LOWORD( GetTickCount() ) );
|
|
|
|
|
Just to make sure we are on the same wavelength here, you do know that all the sleep(1) call is doing is releasing CPU cycles to other processes. If you look at your app in the task manager it will still be hitting the 80-90% which is a bad thing really. You really shouldn't be using a loop for such a lengthy process.
Drawing a single scene of your animation takes a split second, you only need to draw that to the screen about 30 times a second ( less if the animation doesn't change often ). You should work out how often you need to draw a new scene and set a timer for that value. Handle the WM_TIMER to draw the scene but do not draw it to the screne. Instead, create a counter. So for example if you draw a scene 100 times a second, each time increase your counter, when the counter is 30/100 bitblt to the screen then reset the counter.
You may also find that using SetPixel() is incredibly slow. It may be a better idea to use a DIB and manipulate the pixels directly. Also to further increase your speed, create an offscreen bitmap to the same resolution as the screen.
|
|
|
|
|
How rename files and folders in a tree control?
Jus by editing labels in tree control....
-- modified at 10:45 Thursday 30th November, 2006
|
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
