源于iOS App开发时，控制台日志混乱，不便于分析的需要，产生了这篇文章。
基础票
说说NSLog
- 调用NSLogv ＝> Logs an error message to the Apple System Log facility.
- Output from NSLogv is serialized, in that only one thread in a process can be doing the writing/logging described above at a time.
- STDERR_FILENO
- ASL
iOS日志重定向到文件
{
//to log to document directory
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsPath = [paths objectAtIndex:0];
NSString *loggingPath = [documentsPath stringByAppendingPathComponent:@"/mylog.log"];
NSLog(@"%@", loggingPath);
//redirect NSLog
freopen([loggingPath cStringUsingEncoding:NSASCIIStringEncoding], "a+", stderr);
}
这样我们就可以在电脑上面直接tail -f这个文件，配合grep等命令进行日志分析了。
不进行日志重定向
iOS模拟器的日志其实是输出到系统中某个文件中了，好像是定时压缩一个保存起来，我们只要找到那个文件就可以tailf了。
system.log文件在哪儿.png
根据当前模拟器的identifier(windows-devices菜单)按图示找到当前模拟器腺癌的system.log文件，右键finder显示，然后直接tailf就可以啦。
如何更方便呢？
To give yourself faster access to logs via terminal, you can add an alias to your .bash_profile file by typing:
echo "alias simulatorlog='tail -f ~/Library/Logs/iOS\ Simulator/7.0/system.log'" >> ~/.bash_profile
After it you can simply type simulatorlog into terminal window to access the logs.
像我自己的电脑，是这样配的(查看iPhone6的日志)：
alias mylog6='tail -f /Users/test/Library/Logs/CoreSimulator/0A5E599A-D202-4502-8E3C-B6E97840E7ED/system.log'
查看日志时，直接mylog6 | grep something
Enjoy.
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分享篇
下面是组内分享时用的md文件，是一个大概的总结性的东西，虽然没有详细的展开（分享时口说呗，写起来好累赘的样子），但感觉对于理思路还是挺好的。
Basic Loggers Related（主要是Logger分类）
- Apple System Logger
- Standard output
- standard error
- File Logger
- HTTP Server Logger
- Telnet Server Logger
- Telnet协议是TCP/IP协议族中的一员，是Internet远程登陆服务的标准协议和主要方式。它为用户提供了在本地计算机上完成远程主机工作的能力。在终端使用者的电脑上使用telnet程序，用它连接到服务器。终端使用者可以在telnet程序中输入命令，这些命令会在服务器上运行，就像直接在服务器的控制台上输入一样。
- TCP Server Logger
- UDP Server Logger
- TCP Client Logger
- UDP Client Logger
- Onscreen Logging Overlay
- Custom Loggers
- Custom Logger fomatters
Basic Libraries Related（理清这几个库的关系）
- _
-
_
- XLFacility
-
GCDNetworking
- GCDNetworking is a networking framework based on GCD available under a friendly New BSD License.
-
GCDWebServer
- GCDWebServer is a modern and lightweight GCD based HTTP 1.1 server designed to be embedded in OS X & iOS apps.
-
GCDTelnetServer
- GCDTelnetServer is a drop-in embedded Telnet server for iOS and OS X apps.
-
_
-
CocoaAsyncSocket
- CocoaAsyncSocket provides easy-to-use and powerful asynchronous socket libraries for Mac and iOS. The classes are described below.
- GCDAsyncSocket is a TCP/IP socket networking library built atop Grand Central Dispatch.
- GCDAsyncUdpSocket is a UDP/IP socket networking library built atop Grand Central Dispatch.
- 日志实现用了CocoaLumberjack
-
CocoaHTTPServer（FMock工具用的这个）
- CocoaHTTPServer is a small, lightweight, embeddable HTTP server for Mac OS X or iOS applications.
- 底层实现用了CocoaAsyncSocket
-
RoutingHTTPServer
- A routing API for CocoaHTTPServer
- 底层实现用了CocoaHTTPServer
-
CocoaAsyncSocket
Guide（演示内容）
- XLFacility --> HTTPServer
http://127.0.0.1:8080
- XLFacility --> TelnetServer
telnet localhost 2323
- XLFacility --> Onscreen Logging Overlay
- CocoaLumberjack --> UDPClient
start udp server- test udp client logger
- 下面是一个简单的udp server代码：
#!/usr/bin/env python
# UDP Echo Server - udpserver.py
# code by www.cppblog.com/jerryma
import socket, traceback
host = '127.0.0.1'
port = 8888
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind((host, port))
while 1:
try:
message, address = s.recvfrom(8192)
print "Got data from", address, ": ", message
s.sendto(message, address)
except (KeyboardInterrupt, SystemExit):
raise
except:
traceback.print_exc()
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