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GIF Animated 扩展：可点击透明背景动画GIF播放器 · App Inventor 2 中文网
... 交互式GIF菜单
当 GifAnimated1.点击
如果 点击区域 = "左侧" 则
显示通知 "选择了左菜单项"
否则如果 点击区域 = "右侧" 则
显示通知 "选择了右菜单项"
否则
显示通知 "点击了中心区域"
文件路径说...
Freeing up a TCP/IP port?
...tening for http requests on port 80 (run as root or use sudo):
# fuser 80/tcp
If you want to kill them, then just add the -k option.
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Can't connect to localhost on SQL Server Express 2012 / 2016
... If not, start it.
You need to make sure that SQL Server is allowed to use TCP/IP or named pipes. You can turn these on by opening the SQL Server Configuration Manager in Start > Programs > Microsoft SQL Server 2012 > Configuration Tools (or SQL Server Configuration Manager), and make sure ...
Keep-alive header clarification
...this info kept ("this connection is between computer A and server F")?
A TCP connection is recognized by source IP and port and destination IP and port. Your OS, all intermediate session-aware devices and the server's OS will recognize the connection by this.
HTTP works with request-response: cli...
Who is listening on a given TCP port on Mac OS X?
On Linux, I can use netstat -pntl | grep $PORT or fuser -n tcp $PORT to find out which process (PID) is listening on the specified TCP port. How do I get the same information on Mac OS X?
...
Can two applications listen to the same port?
... differs depending on what OS is being considered. In general though:
For TCP, no. You can only have one application listening on the same port at one time. Now if you had 2 network cards, you could have one application listen on the first IP and the second one on the second IP using the same port ...
App Inventor 2开发计步器与定位器 - App Inventor 2 中文网 - 清泛IT论坛，有思想、有深度
...顶部设置显示步数、距离、计时、位置等关键信息的显示区域；
在显示区域下面，设置开始、停止、保存等按钮，用于启动程序的计步、计时功能；
在页面最底部设置历史信息的保存信息显示区域，用来保存历史数据，同时...
fstream默认不支持中文路径和输出整数带逗号的解决办法 - C/C++ - 清泛网 -...
...中文操作系统下，调用locale::global(std::locale(""))，将全局区域设置为中文，如下例：
#include <iostream>
#include <fstream>
#include <string>
#include <direct.h>
using namespace std;
void main()
{
locale::global(std::locale("")); //将全局区域设为...
linux 通过bind下搭建DNS Server - 更多技术 - 清泛网 - 专注C/C++及内核技术
...1.理论普及
DNS服务器分为:
master（主DNS服务器）：拥有区域数据的文件，并对整个区域数据进行管理。
slave(从服务器或叫辅助服务器）：拥有主DNS服力器的区域文件的副 本，辅助主DNS服务器对客户端进行解析，当主DNS服务器...
When is TCP option SO_LINGER (0) required?
...TIME_WAIT state, tying up all the available resources on a server.
When a TCP connection is closed cleanly, the end that initiated the close ("active close") ends up with the connection sitting in TIME_WAIT for several minutes. So if your protocol is one where the server initiates the connection c...