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数据存储组件 · App Inventor 2 中文网
...摘要（MD5、SHA1、SHA256）、HMAC-SHA256 签名、AES 加解密、Base64 编解码和随机字符串。
调用各家接口时的参数签名、提交前把密码转成摘要、把敏感数据加密后再保存，都用它。
所有方法直接返回结果文本；文本一律按 UTF-8 处理...
How can I make a TextArea 100% width without overflowing when padding is present in CSS?
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84
The answer to many CSS formatting problems seems to be "add another <div>!"
So, in that ...
How to count the number of set bits in a 32-bit integer?
...all enough counts) that this doesn't produce carry into that top 8 bits.
A 64-bit version of this can do 8x 8-bit elements in a 64-bit integer with a 0x0101010101010101 multiplier, and extract the high byte with >>56. So it doesn't take any extra steps, just wider constants. This is what GCC...
“Failed to load platform plugin ”xcb“ ” while launching qt5 app on linux without qt installed
...the /usr/bin/platforms dir created. Solved with: sudo ln -sf /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/ /usr/bin/
– gipsh
Mar 13 '17 at 17:31
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What are bitwise shift (bit-shift) operators and how do they work?
... of two that added together makes 320:
(row * 320) = (row * 256) + (row * 64)
Now we can convert that into left shifts:
(row * 320) = (row << 8) + (row << 6)
For a final result of:
memoryOffset = ((row << 8) + (row << 6)) + column
Now we get the same offset as before...
Unable to execute dex: GC overhead limit exceeded in Eclipse
... @MuhammadRiyaz It depends on your OS and whether you're using a 32-bit or 64-bit JVM. If you're on a 64 bit JVM, you can safely set it to anything smaller than your RAM size minus overhead for OS/other applications. On a 32 bit VM, you'll want to keep it smaller than about 1500M (on Linux) or 110...
Is there a concurrent List in Java's JDK?
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84
Note it copies the whole list on every insert, so it is often inefficient.
– dfrankow
Mar 28 '13 at ...
How do I find which rpm package supplies a file I'm looking for?
...d that yum would install the mod_files.sh file with the php-devel x86_64 5.1.6-23.2.el5_3 package, but the file appears to not to be installed on my filesystem.
...
What is the difference between “Form Controls” and “ActiveX Control” in Excel 2010?
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96
Google is full of information on this. As Hans Passant said, Form controls are built in to Exce...
How to JSON serialize sets?
...isappeared
updated the call to the parents' default with super()
using base64 to serialize the bytes type into str (because it seems that bytes in python 3 can't be converted to JSON)
from decimal import Decimal
from base64 import b64encode, b64decode
from json import dumps, loads, JSONEncoder
imp...