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accepting HTTPS connections with self-signed certificates
...mportant parts from my blog article here:
Grab all required certificates (root and any intermediate CA’s)
Create a keystore with keytool and the BouncyCastle provider and import the certs
Load the keystore in your android app and use it for the secured connections (I recommend to use the Apache H...
浅析为什么char类型的范围是 -128~+127 - C/C++ - 清泛网 - 专注C/C++及内核技术
...变为1 1000 0000 这样才能转化为
-128输出，不然1000 0000 如何输出？这当然是我的一种推断，具体怎么实现还得问CPU的设计者了。。。。
再看一个例子：
char a=-129;
printf("%d",a) ; 会输入多少？？ 结果为127 ，为...
How do I set up DNS for an apex domain (no www) pointing to a Heroku app?
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(Note: root, base, apex domains are all the same thing. Using interchangeably for google-foo.)
Traditionally, to point your apex domain you'd use an A record pointing to your server's IP. This solution doesn't scale and isn't viabl...
How can “while (i == i) ;” be a non-infinite loop in a single threaded application?
...magic value within a calculation. Because a calculation failed - eg square root of a negative, divide by zero etc - it makes no sense in comparing them against anything else. After all if divide by zero is a nan is it equivalent to the square root of -2 or square root of -3 ?
Nan allows a calculati...
Java: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification
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this hasn't worked for me. I have the root and the chain cert installed, but Tomcat-7 still reports validatorException caused by "unable to find valid certification path to requested target" any way to debug this?
– Cheruvim
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How should you build your database from source control?
.../setup_db.sql
proj/sql/dummy_data.sql
proj/sql/mssql_specific.sql
proj/sql/mysql_specific.sql
And then I abstract out all my SQL queries so that I can build the entire project for MySQL, Oracle, MSSQL or anything else.
Build and test automation uses these build-scripts as they are as important as...
Rails.env vs RAILS_ENV
...ewise, you can use RAILS_DEFAULT_LOGGER to get the current logger or RAILS_ROOT to get the path to the root folder.
Starting from Rails 2.x, Rails introduced the Rails module with some special methods:
Rails.root
Rails.env
Rails.logger
This isn't just a cosmetic change. The Rails module offers ...
'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine
...E.O"
even in the upcoming office 2016
c:\Program Files\Microsoft Office\root\VFS\ProgramFilesCommonX64\Microsoft Shared\OFFICE16\MSO.DLL
c:\Program Files\Microsoft Office\root\VFS\ProgramFilesCommonX86\Microsoft Shared\OFFICE16\MSO.DLL
you will find the strings
Microsoft.ACE.OLEDB
Microsoft....
Get folder name from full file path
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See DirectoryInfo.Name:
string dirName = new DirectoryInfo(@"c:\projects\roott\wsdlproj\devlop\beta2\text").Name;
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How can I programmatically create a new cron job?
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The best way if you're running as root, is to drop a file into /etc/cron.d
if you use a package manager to package your software, you can simply lay down files in that directory and they are interpreted as if they were crontabs, but with an extra field for t...