Notes by Dr. Xi

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Created by Dr. Xi on February 13, 2013 19:40:08    Last update: February 13, 2013 19:40:08
According to MSDN : On Windows 7 and on Windows Server 2008 R2 with the Wireless LAN Service installed, the operating system installs a virtual device if a Hosted Network capable wireless adapter is present on the machine. This virtual device normally shows up in the "Network Connections Folder" as "Wireless Network Connection 2" with a Device Name of "Microsoft Virtual WiFi Miniport adapter" if the computer has a single wireless network adapter. This virtual device is used exclusively for performing software access point (SoftAP) connections. The lifetime of this virtual device is tied to the physical wireless adapter. If the physical wireless adapter is disabled, this virtual device will be removed as well. On Windows 7, there's no UI to start or stop SoftAP....
Created by Dr. Xi on May 25, 2012 15:47:34    Last update: May 25, 2012 15:49:33
Steps to configure SSL for Apache HTTPD server on Windows: In Apache2.2/conf/httpd.conf , load mod_ssl and include httpd-ssl.conf : LoadModule ssl_module modules/mod_ssl.so ... In Apache2.2/conf/extra/httpd-ssl.conf , make sure the paths for the cert files point to the cert and key you want to use: # Server Certificate: # Point SSLCertificat... Start up Apache. If it fails, use the command line to see what the error is. There won't be any log in error.log if there are errors in the conf files: C:\Program Files (x86)\Apache Software Foundation\... I corrected the previous error by using the alternative line for SSLSessionCache : # Inter-Process Session Cache: # Configure ...
Created by Dr. Xi on February 06, 2012 12:14:11    Last update: February 07, 2012 15:39:35
Oracle sqlplus command line tools does not support command line editing out-of-the-box. But on Linux there's a handy utility that enables command line editing with any command line tool: rlwrap - readline wrapper. Install rlwrap: $ sudo apt-get install rlwrap Create a keywords file .sql.dict (optional, but convenient): false null true access add as asc begin by chec... It would be nice to add the tables names also. Create an alias for sqlplus (put it in .bashrc ): alias sqlplus='rlwrap -f $HOME/.sql.dict sqlplus'
Created by Dr. Xi on February 06, 2012 09:19:27    Last update: February 06, 2012 09:19:27
These are the steps to install the Oracle sqlplus command line utility on Ubuntu Linux: Get Oracle instant client packages from Oracle (you'll need basic or basiclite + sqlplus). Install the RPM files with alien : $ sudo alien -i oracle-instantclient11.2-basic-11.... Install Oracle shared libraries: create file /etc/ld.so.conf.d/oracle.conf and add this line: /usr/lib/oracle/11.2/client/lib then run sudo ldconfig
Created by Dr. Xi on January 09, 2012 09:13:38    Last update: January 09, 2012 09:14:18
Unlike CVS, svn does not have a tag command, you create a new tag with copy : $ svn copy http://svn.example.com/repos/calc/trunk... The -r flag may be used to create a tag from an earlier revision: -r [--revision] ARG : ARG (some commands al...
Created by Dr. Xi on July 13, 2011 16:18:05    Last update: July 13, 2011 16:18:05
The goal is to read a file like this: for (String line: textFileReader) { // do s... This is the code: import java.io.*; import java.util.Iterator; ...
Created by Dr. Xi on June 22, 2011 12:14:15    Last update: June 22, 2011 12:15:12
Parsing a CVS file seemed to be a sore spot for software development. It's not simple enough that you can roll your own code in a couple of hours, and yet not deemed big enough for a full-fledged project. As a result, there are multiple libraries, each one with its own quirks. This is a summary of some simple tests I've done with five CSV parsers. Apache commons CSV parser : Does not escape backslash. The backslash is treated as literal if not proceeding a double quote, but then there's no way to have a backslash as the last character before the ending quote (even though it's a rare scenario). IOException thrown for unmatched quotes SuperCSV parser Can't handle escapes inside quotes Throws Exception for...
Created by Dr. Xi on June 22, 2011 07:33:45    Last update: June 22, 2011 11:57:54
Demo code for CSV parsing with OpenCSV . Java code: import java.io.*; import au.com.bytecode.opencs... Test with a simple CSV file: psmith01,CLASS2B,Peter Smith 1,YEAR2,1,N,ADVANCED,... The parser worked correctly: Line 1 has 11 values: |psmith01| |CLASS2B|... Test with a more complicated CSV file: "psmith01 abc", "CLASS2B " , " Peter... Result: Line 1 has 4 values: |psmith01 abc| |CLASS... The parser: Escaped quote and backslash correctly Ignored spaces before the quotation mark - sometimes (see below) Counted spaces after the right quotation mark till the comma as content, including the right quotation mark (bug). Ignored improperly quoted item - silently (third line) Indeed, the OpenCSV parser has a problem with spaces: Input: "Smith, Jack", "210-345-8888" "Smith, J... Result: Line 1 has 2 values: | Smith, Jack| |210-3......
Created by Dr. Xi on June 22, 2011 09:42:35    Last update: June 22, 2011 11:39:40
Demo code for CSV parsing with Skife CSV . Java code: import java.io.*; import java.util.*; import... Test with a simple CSV file: psmith01,CLASS2B,Peter Smith 1,YEAR2,1,N,ADVANCED,... The parser worked correctly: Line 1 has 11 values: |psmith01| |CLASS2B|... Test with a more complicated CSV file: "psmith01 abc", "CLASS2B " , " Peter... Result: Line 1 has 4 values: |psmith01 abc| | CLAS... The parser worked correctly. But notice that it counts the spaces outside of the quotes significant, and doing so consistently. One more test for spaces: "Smith, Jack" , "210-345-8888" "Smith, Jack"... Result: Line 1 has 2 values: | Smith, Jack | | 210... Add a new line in item two: "One", "Two ", "Three" Result: Line 1 has 2 values: |One| | Two| L...
Created by Dr. Xi on June 21, 2011 15:41:51    Last update: June 22, 2011 11:33:36
Demo code for CSV parsing with Apache Commons CSV parser . Java code: import java.io.*; import org.apache.commons.csv... Test with a simple CSV file: psmith01,CLASS2B,Peter Smith 1,YEAR2,1,N,ADVANCED,... Result: Line 1 has 11 values: |psmith01| |CLASS2B|... The parser worked correctly. Test with a more complicated CSV file: "psmith01 abc", "CLASS2B " , " Peter... Result: Line 1 has 4 values: |psmith01 abc| |CLASS... The third line is invalid input, but throwing a Java IOException is a bit grave. Also, the parser is not able to escape a backslash. Add a new line in item two: "One", "Two ", "Three" Result: Line 2 has 3 values: |One| |Two | |...
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