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How to generate random SHA1 hash to use as ID in node.js?
..."random".
var id = crypto.randomBytes(20).toString('hex');
//=> f26d60305dae929ef8640a75e70dd78ab809cfe9
The resulting string will be twice as long as the random bytes you generate; each byte encoded to hex is 2 characters. 20 bytes will be 40 characters of hex.
Using 20 bytes, we have 256^20...
Java: Difference between the setPreferredSize() and setSize() methods in components
...setSize().
– Sbodd
Nov 23 '09 at 16:05
8
My recommendation is to always use a layout manager. Se...
400 vs 422 response to POST of data
... not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing).
However, prior to that re-wording (or if you want to quibble about RFC 7231 only being a proposed standard right now),...
json_encode is returning NULL?
...
If you have at least PHP 5.5, you can use json_last_error_msg(), which will return a string describing the problem.
If you don't have 5.5, but are on/above 5.3, you can use json_last_error() to see what the problem is.
It will return an integer, that you can use to identify ...
Write a number with two decimal places SQL server
...r 2008 R2
– SKCS Kamal
Apr 21 at 15:05
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How to fix “Incorrect string value” errors?
... application tended to discard random emails due to incorrect string value errors, I went though and switched many text columns to use the utf8 column charset and the default column collate ( utf8_general_ci ) so that it would accept them. This fixed most of the errors, and made the application s...
error C2664: “std::list::list(const std::allocator &)”: 不能将参数 1...
error C2664: “std::list::list(const std::allocator &)”: 不能将参数 1 从 “std::vector”转换为“const std::allocator &”错误日志：error C2664: std::list<_Ty>::list(const std::allocator<_Ty> &): 不能将参数 1 从std::vector<_Ty>转换为const std::...错误日志：
error ...
conflicting types for \'dev_t\'的原因 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...这貌似是一个Linux历史遗留问题:
/usr/include/sys/types.h:62: error: conflicting types for ‘dev_t’
/usr/include/linux/types.h:13: error: previous declaration of ‘dev_t’ was here
/usr/include/sys/types.h:67: error: conflicting types for ‘gid_t’
/usr...
TortoiseSVN允许修改日志的方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...::::::::::::::::::::::::::::::::::
if /I not '%propname%'=='svn:log' goto ERROR_PROPNAME
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:: Only allow modifications to svn:log (no addition/overwrite or deletion)
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::...
App Inventor 2 解决一个编译报错DX failed - App Inventor 2 中文网 - 清...
...not* an inner class.
[java] Uncaught translation error: java.lang.IllegalArgumentException: already added: Lorg/eclipse/paho/client/mqttv3/BufferedMessage;
[java] Uncaught translation error: java.lang.IllegalArgumentException: already added: Lorg/e...