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How to manage startActivityForResult on Android?
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It feels a bit odd to create a new Intent that only exists to hold a Bundle and doesn't have the normal values like an action or component. But it also feels a bit odd (and potentially dangerous?) to modify the Intent that was used to l...
A good book for learning D3.js [closed]
...isualization with D3 Cookbook that looks promising and appears to assume a bit more of the reader than does Scott Murray's book.
There's also a d3.js intro for people who are still new to HTML and CSS:
Part1: http://nrecursions.blogspot.in/2014/11/getting-your-head-around-d3js.html
Part2: http://...
C++中智能指针的设计和使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ain(void)
{
int *pi = new int(42);
HasPtr *hpa = new HasPtr(pi, 100); // 构造函数
HasPtr *hpb = new HasPtr(*hpa); // 拷贝构造函数
HasPtr *hpc = new HasPtr(*hpb); // 拷贝构造函数
HasPtr hpd = *hpa; // 拷贝构造函数
cout << hpa->get_...
Redis cache vs using memory directly
...lected languages.
Redis can persist the data on disk if needed.
Redis is a bit more than a simple cache: it provides various data structures, various item eviction policies, blocking queues, pub/sub, atomicity, Lua scripting, etc ...
Redis can replicate its activity with a master/slave mechanism in ...
Change type of varchar field to integer: “cannot be cast automatically to type integer”
...on't use it myself, because I find psql much quicker and easier. I wrote a bit of a rant about PgAdmin usability with regards to backup and restore a while ago: blog.ringerc.id.au/2012/05/…
– Craig Ringer
Nov 1 '12 at 4:24
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how do you filter pandas dataframes by multiple columns
...one from @redreamality):
import pandas as pd
import numpy as np
length = 100_000
df = pd.DataFrame()
df['Year'] = np.random.randint(1950, 2019, size=length)
df['Gender'] = np.random.choice(['Male', 'Female'], length)
%timeit df.query('Gender=="Male" & Year=="2014" ')
%timeit df[(df['Gender']=...
How to re-sign the ipa file?
...h the new certificate (--resource-rules has been deprecated OS X Yosemite (10.10), it can safely be removed)
/usr/bin/codesign -f -s "$CERTIFICATE" Payload/*.app
# zip it back up
zip -qr resigned.ipa Payload
Your new signed app is called resigned.ipa
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Why is it common to put CSRF prevention tokens in cookies?
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edited Dec 15 '17 at 10:15
Lutz Prechelt
26.4k55 gold badges4949 silver badges7171 bronze badges
an...
SQL UPDATE SET one column to be equal to a value in a related table referenced by a different column
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10 Answers
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How to automatically crop and center an image
Given any arbitrary image, I want to crop a square from the center of the image and display it within a given square.
7 Ans...