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Determining 32 vs 64 bit in C++
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#if _WIN32 || _WIN64 … #elif __GNUC__ … #else # error "Missing feature-test macro for 32/64-bit on this compiler."?
– Davislor
Nov 29 '15 at 20:24
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Difference between null and empty (“”) Java String
...:
System.out.println(a.length()); // 0
System.out.println(b.length()); // error; b is not an object
"" is still a string, meaning you can call its methods and get meaningful information. null is an empty variable - there's literally nothing there.
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Why must a lambda expression be cast when supplied as a plain Delegate parameter
...gnature, but that's rarely useful and you end up with less opportunity for error checking.
If you want to make it easy to call Control.Invoke with an Action the easiest thing to do is add an extension method to Control:
public static void Invoke(this Control control, Action action)
{
control.I...
How do I find out which keystore was used to sign an app?
...:78:24:DC:CA:92:36:FF:AE:8C:17:DB
SHA1: 16:59:E7:E3:0C:AA:7A:0D:F2:0D:05:20:12:A8:85:0B:32:C5:4F:68
Signature algorithm name: SHA1withRSA
Then use the keytool again to print out all the aliases of your signing keystore:
keytool -list -keystore my-signing-key.keystore
You will get a li...
How do you sign a Certificate Signing Request with your Certification Authority?
...ivate key:
Sign the certificate? [y/n]:Y
failed to update database
TXT_DB error number 2
So unique_subject = no is perfect for testing.
If you want to ensure the Organizational Name is consistent between self-signed CAs, Subordinate CA and End-Entity certificates, then add the following to you...
Multiple glibc libraries on a single host
...he pieces is ld-linux.so.2, and it must match libc.so.6, or you'll see the errors you are seeing.
The absolute path to ld-linux.so.2 is hard-coded into the executable at link time, and can not be easily changed after the link is done.
To build an executable that will work with the new glibc, do th...
Read an Excel file directly from a R script
...ta (i.e., not comma-formatted numbers, dates, formulas with divide-by-zero errors, missing values, etc. etc. ..) I generally have no problem with this process.
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实战Nginx与PHP（FastCGI）的安装、配置与优化 - 更多技术 - 清泛网 - 专注...
...版本的不确定性，读者也可以在安装PHP过程中，根据错误提示信息，安装对应的软件库。
3.开始编译安装PHP和PHP-FPM
编译安装PHP和PHP-FPM很简单，下面是安装过程：
[root@localhost local]#tar zxvf php-5.2.13.tar.gz
[root@localhost local]#g...
Undefined reference to `pow' and `floor'
...ts symbols from object file. You can see that this was compiled without an error, but pow, floor, and printf functions have undefined references, now if I will try to link this to executable:
$ gcc fib.o
fib.o: In function `fibo':
fib.c:(.text+0x57): undefined reference to `pow'
fib.c:(.text+0x84):...
PostgreSQL: Modify OWNER on all tables simultaneously in PostgreSQL
...d to a database that I created (i.e. not a system database), it says this: ERROR: cannot reassign ownership of objects owned by role postgres because they are required by the database system
– thnee
Mar 8 '13 at 23:19
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