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How to sleep for five seconds in a batch file/cmd [duplicate]
...ait for. If the accuracy of the wait time is important (ie a second or two extra delay is not acceptable), you can use this approach:
powershell -command "$sleepUntil = [DateTime]::Parse('%date% %time%').AddSeconds(5); $sleepDuration = $sleepUntil.Subtract((get-date)).TotalMilliseconds; start-sleep...
App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 · App Inventor 2 中文网
...要弄错以免烧坏硬件）
一般来说，需要接线的端口有以下4个，无论哪款蓝牙硬件，也无论哪种其他硬件，这4个端口都是基本的存在：VCC（正极）、GND（接地负极）、TX、RX 交叉接线，参考接线如图：
2、串...
Apache and Node.js on the Same Server
...writeCond %{REQUEST_URI} ^socket.io [NC]
RewriteCond %{QUERY_STRING} transport=websocket [NC]
RewriteRule /{.*} ws://localhost:3000/$1 [P,L]
RewriteCond %{HTTP:Connection} Upgrade [NC]
RewriteRule /(.*) ws://localhost:3000/$1 [P,L]
ProxyPass /nodejs http://loca...
java.net.ConnectException: localhost/127.0.0.1:8080 - Connection refused
...
in android
Replace: String webServiceUrl = "http://localhost:8080/Service1.asmx"
With : String webServiceUrl = "http://10.0.2.2:8080/Service1.asmx"
Good luck!
share
...
write a shell script to ssh to a remote machine and execute commands
...andard output and standard error as each host completes
-x args: Passes extra SSH command-line arguments
-o option: Can be used to give options in the format used in the configuration file.(/etc/ssh/ssh_config) (~/.ssh/config)
-p parallelism: Use the given number as the maximum number of con...
Predicate Delegates in C#
... can also be assigned to a Predicate delegate type as below:
Predicate<string> isUpper = delegate(string s) { return s.Equals(s.ToUpper());};
bool result = isUpper("Hello Chap!!");
Any best practices about predicates?
Use Func, Lambda Expressions and Delegates instead of Predicates.
...
物联网入门 · App Inventor 2 中文网
...ard 的 1.0.7 版本。注意不要使用更高版本固件。
5. 选择端口
在“工具”→“端口”中选择 Arduino 对应端口：macOS 通常以 /dev/cu.usbmodem 开头，Windows 通常显示为 COMX (Arduino/Genuino 101)。插入开发板后端口可能需要等待一会儿才出...
Can't connect to localhost on SQL Server Express 2012 / 2016
...ify your SQL Server connection authentication mode matches your connection string:
If you're connecting using a username and password, you need to configure SQL Server to accept "SQL Server Authentication Mode":
-- YOU MUST RESTART YOUR SQL SERVER AFTER RUNNING THIS!
USE [master]
GO
DECLARE @SqlS...
How to write a scalable Tcp/Ip based server
...n.ReceiveBuffer.IndexOf('\n', index)) != -1)
{
string s = connection.ReceiveBuffer.GetString(start, index - start - 1);
s = s.Backspace();
LineReceivedEventArgs args = new LineReceivedEventArgs(connection, s);
Delegate[] de...
Security of REST authentication schemes
...APIs, it's better for the client to be passing tokens - randomly generated strings - instead of the password the developer logs into the website with. So the developer should be able to log into your site and generate new tokens that can be used for API verification.
The main reason to use a token ...