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MQTT物联网协议完全实践指南 · App Inventor 2 中文网
...源
MQTT扩展下载：
de.ullisroboterseite.ursai2pahomqtt.aix
完整示例项目：
mqtt_demo.aia
MQTT协议深度解析
1. 协议架构与通信模式
MQTT采用客户端-服务器架构，基于发布/订阅（Publish/Subscribe）...
How do I determine if my python shell is executing in 32bit or 64bit?
...("%x" % sys.maxsize, sys.maxsize > 2**32)'
('7fffffff', False)
$ python-64 -c 'import sys;print("%x" % sys.maxsize, sys.maxsize > 2**32)'
('7fffffffffffffff', True)
sys.maxsize was introduced in Python 2.6. If you need a test for older systems, this slightly more complicated test should wor...
Simple way to encode a string according to a password?
...ère cipher
It's quick and easy to implement. Something like:
import base64
def encode(key, string):
encoded_chars = []
for i in xrange(len(string)):
key_c = key[i % len(key)]
encoded_c = chr(ord(string[i]) + ord(key_c) % 256)
encoded_chars.append(encoded_c)
en...
Java 32-bit vs 64-bit compatibility
...de built and compiled against a 32-bit JDK into 32-bit byte code work in a 64-bit JVM? Or does a 64-bit JVM require 64-bit byte code?
...
Base64 length calculation?
After reading the base64 wiki ...
15 Answers
15
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The input is not a valid Base-64 string as it contains a non-base 64 character
...ther console application after converting it to Byte array and then to Base64 string. This part works, but when the same stream is received at the application, it gets manipulated and is no longer a valid Base64 string. Some junk characters are getting introduced into the stream.
...
NodeJS: How to decode base64 encoded string back to binary? [duplicate]
...hashing with salt, so I generated salt as binary, hashed the password, base64 encoded the password and salt then stored them into database.
...
Http Basic Authentication in Java using HttpClient?
...
Have you tried this (using HttpClient version 4):
String encoding = Base64Encoder.encode(user + ":" + pwd);
HttpPost httpPost = new HttpPost("http://host:post/test/login");
httpPost.setHeader(HttpHeaders.AUTHORIZATION, "Basic " + encoding);
System.out.println("executing request " + httpPost.getR...
Link to all Visual Studio $ variables
...
164
Try this MSDN page: Macros for Build Commands and Properties
...
converting a base 64 string to an image and saving it
...with image.Save(...).
public Image LoadImage()
{
//data:image/gif;base64,
//this image is a single pixel (black)
byte[] bytes = Convert.FromBase64String("R0lGODlhAQABAIAAAAAAAAAAACH5BAAAAAAALAAAAAABAAEAAAICTAEAOw==");
Image image;
using (MemoryStream ms = new MemoryStream(bytes...