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Certificate in PEM Format
This section describes what is certificate PEM (Privacy Enhanced Mail) format - A format uses PEM idea to convert a certificate in DER format to a message of printable characters. The conversion uses the Base64 encoding.
2020-02-23, 6763👍, 4💬

💬 2020-02-23 Herong: Mark, if your certificate is signed by your own CA, put it on the Apache server together with the CA certificate to test. Other ...

💬 2020-02-17 mark scorfield: Hi i have a pem certificate x509 that i would like to share against my own certificate signing authority , what is the best way ...

💬 2016-03-30 Herong: Bcbin, why don't you post your question here? Maybe others can help you too. Or send me an email directly.

💬 2016-03-27 bcbin: my name is bcbin, my email is bcbin@yahoo.com. please connecting me. i need you help ):

Windows 8: Modify UEFI Boot Order in BIOS
This section provides a tutorial example on how to modify UEFI boot order in BIOS in order to boot from Windows 8 repair disc directly.
2017-03-24, 6746👍, 2💬

💬 2017-03-24 pros: I've been looking for this. thanks,

💬 2016-04-23 dan: Finally someone explained this so i can understand it. Thank you so much for getting me where i needed to go.

XSD Validation and Error List
This section provides a tutorial example on how to perform XSD validation and view error list using XML Tools Plugin in Notepad++.
2017-05-27, 6700👍, 7💬

💬 2017-05-27 Herong: No problem. Have a good weekend!

💬 2017-05-27 Greg: Me again - false alarm, the error message I saw was caused by xsi:schemaLocation that was specified in the file. Sorry to troubl...

💬 2017-05-26 Greg: Hi, this was working fine, but now when I click Validate Now, I get an error message: Following error occurred during schema ...

💬 2015-12-23 Herong: Mat2001uk, That is better than the version I was testing. Thanks for sharing this information with us.

💬 2015-12-22 Mat2001uk: In v6.8.6 I see only one error:"XML Parsing error at line 16: StartTag: invalid element name" ...just FYI.

(More comments ...)

Removing IE Addon "Skype Browser Helper"
This section provides a tutorial example on how to disable and remove 'Skype Browser Helper' addon from Internet Explorer.
2019-05-27, 6693👍, 7💬

💬 2019-05-27 Daniel Parker: Hi Herongyang.com, How are you doing today? I'm sure you have been reached regarding this before but our value proposition is ve...

💬 2018-05-07 Daniel Parker: Hi Herongyang.com, How are you doing today? I'm sure you have been contacted regarding this before but our value proposition is ...

💬 2017-07-15 Herong: Thomas, "Skype Browser Helper" add-on is part of the "Skype Click to Call" installed program. So uninstall "Skype Click to Call"...

💬 2017-07-14 Thomas: I also notice that these programs DO NOT APPEAR under Windows Programs and Features. Thus, your suggestion to go there and remov...

💬 2017-07-14 Thomas: Firstly, you mention how to disable the add-on, NOT how to REMOVE IT. Secondly, why are you talking about PDF Link Helper at all...

(More comments ...)

Main Features of XML
This section provides a quick description of XML features and advantages. The power of XML comes from its simplicity and extensibility.
2017-11-26, 6643👍, 2💬

💬 2017-11-26 Abhishek: Thanks!

Java Compilation and Execution Processes
This section provides a quick introduction of Java compilation and execution process.
2020-04-30, 6581👍, 10💬

💬 2020-04-30 Abdul Razzaq from Pakistan: Thanks Yiu

💬 2016-12-04 ak: Thx

💬 2016-09-22 rodriguesss: thanks

💬 2016-03-05 Shohel: THanks lot

💬 2016-01-05 Rishika: THANK U

(More comments ...)

新冠疫苗一览表
全世界有哪些新冠疫苗? 到2021年1月为止,全世界有5款新冠疫苗获得不同国家批准上 市。下面是全世界新冠疫苗一览表: 代号 种类 公司 阶段 获批国家 Ad26.COV2.5 载体 强生(杨森)-美国 III期 欧盟,美国 Ad5-nCoV 载体 康希诺-中国 III期 中国,巴基斯坦,墨西哥 AZD1222 载体 阿斯利康-英国 III期 印度,阿根廷,墨西哥,英国,欧盟,… BBIBP-CorV 灭活 中国生物-中国...
2021-05-04, 6558👍, 0💬

Illustration of DSA Algorithm: p,q=7,3
This section provides a tutorial example to illustrate how DSA digital signature algorithm works with small prime modulus p=7 and prime divisor q=3.
2018-04-24, 6508👍, 5💬

💬 2016-03-22 Herong: Peter, I see the issue now. This example needs to be reviewed and updated. Thanks for the feedback.

💬 2016-03-21 peter winzell: x is not selected according to 0 < x < q

💬 2015-10-19 Herong: Hi Marian, do you have a question about this tutorial?

💬 2015-10-18 Marian: when q=3 x = 5 # selected: 0 < x < q

Drawing Graphics - Using paint() on Frame
This section provides a tutorial example on how to override the paint() method in the javax.swing.JFrame class to draw graphics (a rectangle) on the frame window. This solution is not recommended.
2021-02-23, 6464👍, 4💬

💬 2016-11-12 SuperSasRabushna: I'm super saiyan!!! rabushna!

💬 2016-11-12 Ciciozxz: I think you are the best eu!

Downloading and Installing JDK 1.7.0 on Windows
This section provides a tutorial example on how to download and install JDK 1.7.0 (Java SE 7) on a Windows XP system. A simple Java program was entered, compiled, and executed with the new JDK installation.
2020-04-28, 6458👍, 6💬

💬 2020-04-28 eeeee: thanks

💬 2017-01-02 sudhanshu: no comments

💬 2016-12-17 tangxy: thk, i just want to learn java

💬 2016-11-22 ankit: THANKS

Table of Contents
This free VBScript tutorial book is a collection of notes and sample codes written by the author while he was learning VBScript himself, an ideal tutorial guide for beginners. Topics include Variant, Array, Function, Error Handling, Regular Expression, Dictionary, File System, Class, Object, IE Brow...
2020-04-25, 6447👍, 2💬

💬 2020-04-25 my name is idiot: Me wants it die

💬 2016-05-23 Herong: James, your email address is not working. Please contact me.

HttpsClient.java - HTTPS Client Test Program
This section provides a tutorial example on how to write a HTTPS client test program, HttpsClient.java. It sends a simple HTTP request page using the HTTPS protocol.
2015-11-20, 6357👍, 6💬

💬 2015-11-20 Herong: Philip, can you run HttpsHello server with SSL debug turned on? My test programs do have issues with newer build of JDK 1.7 and ...

💬 2015-11-19 Philip: java version "1.7.0_80" Java(TM) SE Runtime Environment (build 1.7.0_80-b15) Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11,...

💬 2015-11-19 Herong: Philip, which JDK version are you using?

💬 2015-11-18 Philip: I changed the code, but then reset back to the example. I recreated the jks a few times. The JVM and OS had not changed. It stop...

💬 2015-11-18 Herong: Philip, Was anything changed? Certificates, code, JVM or operating system...

(More comments ...)

Declaring Root Elements - "element" Element
This section describes a tutorial example on how to use the Element Declaration Component to declare the root element for a conforming XML document.
2018-08-29, 6325👍, 6💬

💬 2018-08-29 google: &lt;a href="http://google.com">Google& lt;/a>

💬 2018-08-29 rock: Great

💬 2017-03-19 Jay: Thanks dude...

💬 2016-02-02 Herong: Shashi, XML schema does not support unbounded root elements. Only one single root element is allowed. So your schema example is ...

💬 2016-02-01 Shashi: Can you have a root element, which is unbound? Like as follows? Can you please let me know if it valid?

Adding META-INF/MANIFEST.MF to JAR Files
This section provides a tutorial example on how to add manifest files to JAR files.
2016-05-12, 6255👍, 1💬

💬 2016-05-12 mps: nice..

Perl Tutorials - Herong's Tutorial Examples
This Perl tutorial book is a collection of notes and sample codes written by the author while he was learning Perl language himself. Topics include ActivePerl, data types, subroutines, debug, references, objects, open, binary, file, directory, DBM, MySQL, regular expression, RPC::XML, XML::Simple, S...
2020-11-12, 6222👍, 6💬

💬 2020-11-12 Rajat: Hi Herong sir, I am getting error while doing $mech->post for a request every time.Error looks like this `read timeout at /usr/s...

💬 2017-10-23 guru: That's an issue with the Perl script, not with running the script itself, and it deserves another question (not here, on Stack O...

💬 2017-10-06 drhvr: mysql I added root as user and password.in singlequotes. It works great

💬 2014-03-17 Steven Klotz: Hi Herong, I found this web site while looking for PERL examples. Your knowledge and the amount of work you done (docu, tutorial...

💬 2010-11-22 Herong: Kim, Yes, you can prompt the user for a path name, open directory with opendir(), loop through each files, use the -s operator t...

(More comments ...)

Generating Client Side Stub Java Code
This section provides a tutorial example on how to run WSDL2Java to generate client side stub Java code from an existing WSDL document. The generated stub class will have a package name borrowed from the target namespace of the Web service.
2015-11-25, 6197👍, 1💬

💬 2015-11-25 thakur: nice

"keytool" Commands and "keystore" Files
This chapter provides tutorial notes and example codes on the 'keytool' command. Topics include introduction of public key certificates, 'keystore' file, 'keytool' command; generating new keys and self-signed certificates; exporting and importing certificates; cloning certificates to share keys.
2015-11-23, 6119👍, 3💬

💬 2015-08-10 mike: Cool

XSL-FO Tutorials - Herong's Tutorial Examples
This free book is a collection of tutorial notes and sample codes written by the author while he was learning XSL-FO (Extensible Stylesheet Language - Formatting Objects) himself. Topics include XSL, FO, XML, PDF, Formatting, Pagination, Layout, Styling, Header, Footer, Graphics, PDF, Graphics, Font...
2016-06-19, 6110👍, 1💬

💬 2016-06-19 Dell: Great book. Thank you!

What Is SHA1 Message Digest Algorithm?
This section describes what is SHA1 (Secure Hash Algorithm 1) - a message digest algorithm which takes as input a message of arbitrary length and produces as output a 160-bit 'fingerprint'.
2017-12-09, 6083👍, 6💬

💬 2017-12-09 Herong: See the next tutorial: SHA1 Message Digest Algorithm Overview.

💬 2017-12-04 V: where can we find sha-1 formula ?

💬 2016-01-16 raza: i am raza see you latter

💬 2015-10-10 Herong: Ash, the next tutorial may help you understand better: SHA1 Message Digest Algorithm Overview

💬 2015-10-09 Ash: Please can u explain clearly..I dint understood

(More comments ...)

Inputting Chinese Text to MySQL Database in UTF-8
This section describes how to take Chinese text from Web form and store it in MySQL database in UTF-8 encoding.
2017-05-09, 6043👍, 7💬

💬 2017-01-03 wade: 你好

💬 2016-07-22 正繁體字 ñ Jú: 正繁體字 ñ Jú

META-INF Files - Digests, Signature and Certificate
This section describes META-INF files in an .apk package file: MANIFEST.MF - manifest file, CERT.SF - signature file and CERT.RSA - the real signature file with certificate.
2015-09-04, 5949👍, 2💬

💬 2015-09-04 Herong: KariK, thanks for sharing your comments.

💬 2015-08-28 KariK: Step 5. CERT.RSA is not the only file type. There can also be CERT.DSA and CERT.EC files.

First 8336 Hex Digits of PI
This section provides first 8336 hex digits of constant PI, 3.1415927..., needed for Blowfish encryption algorithm.
2019-04-29, 5929👍, 10💬

💬 2019-04-28 Herong: 8336 Hex Digits. Thanks.

💬 2019-04-26 Harry: Do you mean 8336 digits

💬 2016-10-31 Andres: cool

💬 2016-04-07 Tamas Losonczi: This is great

💬 2016-03-15 Bogdan: Thanks!

(More comments ...)

Object Query Language (OQL)
This section describes what is OQL (Object Query Language). OQL statement syntax and examples are also provided.
2016-09-02, 5834👍, 1💬

💬 2016-09-02 Jach: hello world ,I'm Jack!

UserInit - Winlogon Registry Key
This section provides a tutorial example on how to undo changes done by the PWS Trojan on the UserInit registry value under the HKLM\Software\Microsoft\Window sNT\CurrentVersion\Winlogon registry key.
2016-02-25, 5824👍, 2💬

💬 2015-10-22 Herong: Hi John, you are right that we need keep the comma at the end. Tutorial will be updated in the next version. Thanks.

💬 2015-10-21 John: You have left the comma off!! It is important you do not forget the comma or your computer will not boot. Userinit=C:\WINDOWS\sy...

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