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Exception.Message vs Exception.ToString()
... on the inner exception, and the result of calling Environment.StackTrace. If any of these members is a null reference (Nothing in Visual Basic), its value is not included in the returned string.
If there is no error message or if it is an empty string (""), then no error message is returned. The na...
Is the “struct hack” technically undefined behavior?
...
As the C FAQ says:
It's not clear if it's legal or portable, but it is rather popular.
and:
... an official interpretation has deemed that it is not strictly conforming with the C Standard, although it does seem to work under all known implementations. ...
Convert a JSON String to a HashMap
...p<String, Object> retMap = new HashMap<String, Object>();
if(json != JSONObject.NULL) {
retMap = toMap(json);
}
return retMap;
}
public static Map<String, Object> toMap(JSONObject object) throws JSONException {
Map<String, Object> map = new HashMap&l...
How do I remove a substring from the end of a string in Python?
...nds of x.
Instead, you could use endswith and slicing:
url = 'abcdc.com'
if url.endswith('.com'):
url = url[:-4]
Or using regular expressions:
import re
url = 'abcdc.com'
url = re.sub('\.com$', '', url)
share
...
Test if string is a guid without throwing exceptions?
...return will contain the Guid</param>
/// <returns>Returns true if successful, otherwise false</returns>
public static Boolean TryStrToGuid(String s, out Guid value)
{
//ClsidFromString returns the empty guid for null strings
if ((s == null) || (s == ""))
{
...
One-liner to check whether an iterator yields at least one element?
...
any won't go beyond the first element if it's True. In case the iterator yields something false-ish you can write any(True for _ in iterator).
share
|
improve th...
c++提取复数的实部和虚部 - C/C++ - 清泛网 - 专注C/C++及内核技术
.../ 结尾的i的位置
for (int i = len-1; i >-1; i--)
{
if ('i' == strCplx[i])
iPos = i;
else if ('+' == strCplx[i] || '-' == strCplx[i])
{
signPos = i;
break;
}
}
if (0 == iPos) // 纯虚数i
{
...
PHPCMS判断首页列表页内页分类 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...时，经常会遇到否栏目，比如首页，就可以这样来判断 {if !$catid}首页{/if} ，判断很简单，比如首页没有 catid 的值，而其它页面有，哪么就可以通过这样的标签来判断，是个省事的判断方法。
下面是相同的一些标签判断，原理...
Clearing localStorage in javascript?
... I call localStorage.clear() when my app starts up, but even if I close the browser, clear cache, etc., the data are still there. I know this because I have set an "instance" property on my model to a random number on initialize, and, for a given id, the instance property is always th...
Hash Map in Python
... depending on his input I am retrieving some information from the HashMap. If the user enters a key of the HashMap, I would like to retrieve the corresponding value.
...