Monday, September 20, 2010
Sunday, September 19, 2010
Dynamically Allocation Multidimensional Arrays
Doing the ASS of my C programing language, I need to dynamically allocation two dimensional arrays.
So the method is as below:
So the method is as below:
int **a; int i,m,n; scanf("%d %d",&m,&n); *a=(int **)malloc(m*sizepf(int *)); for (i=0;i<m;i++) a[i]=(int *)malloc(n*sizeof(int));
//which is just like in C++: int m,n; int a[m][n]; cin>>m>>n;very funny!
Saturday, September 18, 2010
SyntaxHighlighter in Blogger
SyntaxHighlighter is awesome.
if u wanna use it in blogger, do the following steps:
Download and find a place to host the library files for SyntaxHighlighter. A free choice is, of course, google sites
if u wanna use it in blogger, do the following steps:
Download and find a place to host the library files for SyntaxHighlighter. A free choice is, of course, google sites
Use grep to search strings in files
GREP is a powerful tool to search in linux, as there is no good search tools in windows.
A simple example:
Search all subdirectories recursively
-i ignore case
wanna know more things it can do just:
A simple example:
$ grep "some string" /home/steven/*.txt
Search all subdirectories recursively
$ grep "some string" /home/steven
-i ignore case
wanna know more things it can do just:
grep --help
Friday, September 17, 2010
Win7 is very user friendly
There is a lot of things win7 amazed me.
when I use the remote desktop connect to another server, I can just drag the bar.:
when I use the remote desktop connect to another server, I can just drag the bar.:
One thing DropBox Need to Improve
Just fount out one thing that DropBox need to improve:
When I move one folder into another on the web, the DropBox have to download all of the folder from the net. What a wast! Just do the mv operation on the computer.
When I move one folder into another on the web, the DropBox have to download all of the folder from the net. What a wast! Just do the mv operation on the computer.
Friday, September 10, 2010
Thursday, September 9, 2010
Wednesday, September 8, 2010
Gonna Sleep
Java is Powerful. I am not efficiency in writing java code, but that's all right.Finish it tomorrow!
Just try to publish a post through email
Just try to publish a post through email,
Useful Eclipse Shortcut Keys
Ctrl+Shift+T
Find Java Type
Start typing the name and the list gets smaller. Try typing the capital letters of the class only (e.g. type "CME" to find "ConcurrentModificationException")
Ctrl+Shift+R
Find Resource
Use this to look for XML files, text files, or files of any other type. which are in your workspace.
Ctrl+E
Open Editor Drop-Down
Presents a popup window listing currently opened files. Start typing to limit the list or simply use the down arrow key.
Ctrl+O
Quick Outline
Use this to find a method or a member variable in a class. Start typing to limit the choices. Press Ctrl+O a second time to include inherited methods.
Ctrl+Space
Content Assist
Context sensitive content completion suggestions while editing Java code.
Find Java Type
Start typing the name and the list gets smaller. Try typing the capital letters of the class only (e.g. type "CME" to find "ConcurrentModificationException")
Ctrl+Shift+R
Find Resource
Use this to look for XML files, text files, or files of any other type. which are in your workspace.
Ctrl+E
Open Editor Drop-Down
Presents a popup window listing currently opened files. Start typing to limit the list or simply use the down arrow key.
Ctrl+O
Quick Outline
Use this to find a method or a member variable in a class. Start typing to limit the choices. Press Ctrl+O a second time to include inherited methods.
Ctrl+Space
Content Assist
Context sensitive content completion suggestions while editing Java code.
Tuesday, September 7, 2010
windows netsh command
netsh interface ipv4 show interfaces
Example result:
Idx Met MTU State Name
--- --- ----- ----------- -------------------
1 50 4294967295 connected Loopback Pseudo-Interface 1
9 20 1500 connected Local Area Connection
netsh interface ipv4 show interface 9
Example result:
Interface Local Area Connection Parameters
----------------------------------------------
IfLuid : ethernet_7
IfIndex : 9
Compartment Id : 1
State : connected
Metric : 20
Link MTU : 1500 bytes
Reachable Time : 19000 ms Base Reachable Time : 30000 ms Retransmission Interval : 1000 ms
DAD Transmits : 3 Site Prefix Length : 64 Site Id : 1 Forwarding : disabled
Advertising : disabled Neighbor Discovery : enabled Neighbor Unreachability
Detecion : enabled Router Discovery : dhcp Managed Address Configuration :
enabled Other Stateful Configuration : enabled Weak Host Sends : disabled Weak
Host Receives : disabled Use Automatic Metric : enabled Ignore Default routes :
disabled
Example result:
Idx Met MTU State Name
--- --- ----- ----------- -------------------
1 50 4294967295 connected Loopback Pseudo-Interface 1
9 20 1500 connected Local Area Connection
netsh interface ipv4 show interface 9
Example result:
Interface Local Area Connection Parameters
----------------------------------------------
IfLuid : ethernet_7
IfIndex : 9
Compartment Id : 1
State : connected
Metric : 20
Link MTU : 1500 bytes
Reachable Time : 19000 ms Base Reachable Time : 30000 ms Retransmission Interval : 1000 ms
DAD Transmits : 3 Site Prefix Length : 64 Site Id : 1 Forwarding : disabled
Advertising : disabled Neighbor Discovery : enabled Neighbor Unreachability
Detecion : enabled Router Discovery : dhcp Managed Address Configuration :
enabled Other Stateful Configuration : enabled Weak Host Sends : disabled Weak
Host Receives : disabled Use Automatic Metric : enabled Ignore Default routes :
disabled
Why is there no ARP reply in the packet trace
>Hello
> I'm having a situation concerning Arp where i am seeing no Arp
>reply's to many arp requests on my network when i evaluate with a
>protocol analyzer. I think the arp traffic may be at a level where it
>is disrupting traffic on the network and nodes are dropping off as a
>result. It is a microsoft 2000/xp network running active directory.
>The sniffs show alot of whois arp traffic and i see little or no arp
>reply's with the mac address. I'm wondering what this could be due
>too. It is a flat network with 175 nodes running a class b subnet.
>Wins and Dns are configured. The workstation nodes are mixed
>win2k/xp(majority being 2k), The servers are win2k. Is this high
>amount of arp traffic(between 60 to 90 percent at a server)normal and
>if not what could i do to facilitate the arp reply's. Thanks
How is your protocol analyzer connected to the network? If you're on a
switch, it would be logical that you don't see ARP reply's.
The ARP requests are in the fowm of a broadcast, so sent to every
port. However, the reply is sent as an unicast to the host which made
the ARP request.
Unless you configured a SPAN por, you won't see this traffic on a
switched network. This would also explain why you see such a high
percentage of ARP requests: the unicast traffic isn't captured by your
protocol analyzer.
With kind regards,
Patrick
> I'm having a situation concerning Arp where i am seeing no Arp
>reply's to many arp requests on my network when i evaluate with a
>protocol analyzer. I think the arp traffic may be at a level where it
>is disrupting traffic on the network and nodes are dropping off as a
>result. It is a microsoft 2000/xp network running active directory.
>The sniffs show alot of whois arp traffic and i see little or no arp
>reply's with the mac address. I'm wondering what this could be due
>too. It is a flat network with 175 nodes running a class b subnet.
>Wins and Dns are configured. The workstation nodes are mixed
>win2k/xp(majority being 2k), The servers are win2k. Is this high
>amount of arp traffic(between 60 to 90 percent at a server)normal and
>if not what could i do to facilitate the arp reply's. Thanks
How is your protocol analyzer connected to the network? If you're on a
switch, it would be logical that you don't see ARP reply's.
The ARP requests are in the fowm of a broadcast, so sent to every
port. However, the reply is sent as an unicast to the host which made
the ARP request.
Unless you configured a SPAN por, you won't see this traffic on a
switched network. This would also explain why you see such a high
percentage of ARP requests: the unicast traffic isn't captured by your
protocol analyzer.
With kind regards,
Patrick
The ARP Command -s
arp -s InetAddr EtherAddr
allows you to manually add an entry to the ARP cache that resolves the IP address InetAddr to the physical address EtherAddr.
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