mac osc platforms Xcode programming, Objective-C to prepare the network communication program

XcodeClientServer
.................\About XcodeClientServer.rtf
.................\CommonBuildSettings.xcconfig
.................\CommonInfoPlistSettings.h
.................\NotificationObserver
.................\....................\English.lproj
.................\....................\.............\MainMenu.nib
.................\....................\.............\............\classes.nib
.................\....................\.............\............\info.nib
.................\....................\.............\............\objects.nib
.................\....................\Info-StockObserver.plist
.................\....................\main.m
.................\....................\NotificationObserve.c
.................\....................\README.rtf
.................\....................\StockObserver.h
.................\....................\StockObserver.m
.................\....................\StockObserver.xcodeproj
.................\....................\.......................\project.pbxproj
.................\NotificationPoster
.................\..................\English.lproj
.................\..................\.............\MainMenu.nib
.................\..................\.............\............\classes.nib
.................\..................\.............\............\info.nib
.................\..................\.............\............\objects.nib
.................\..................\Info-StockMarket.plist
.................\..................\main.m
.................\..................\NotificationPost.c
.................\..................\README.rtf
.................\..................\StockMarket.h
.................\..................\StockMarket.m
.................\..................\StockMarket.xcodeproj
.................\..................\.....................\project.pbxproj
.................\XcodeClientServer
.................\.................\StockMarket.app
.................\.................\...............\Contents
.................\.................\...............\........\Info.plist
.................\.................\...............\........\MacOS
.................\.................\...............\........\.....\StockMarket
.................\.................\...............\........\PkgInfo
.................\.................\...............\........\Resources
.................\.................\...............\........\.........\English.lproj
.................\.................\...............\........\.........\.............\MainMenu.nib
.................\.................\...............\........\.........\.............\............\classes.nib
.................\.................\...............\........\.........\.............\............\info.nib
.................\.................\...............\........\.........\.............\............\objects.nib
.................\.................\...............\........\.........\README.rtf
.................\.................\StockObserver.app
.................\.................\.................\Contents
.................\.................\.................\........\Info.plist
.................\.................\.................\........\MacOS
.................\.................\.................\........\.....\StockObserver
.................\.................\.................\........\PkgInfo
.................\.................\.................\........\Resources
.................\.................\.................\........\.........\English.lproj
.................\.................\.................\........\.........\.............\MainMenu.nib
.................\.................\.................\........\.........\.............\............\classes.nib
.................\.................\.................\........\.........\.............\............\info.nib
.................\.................\.................\........\.........\.............\............\objects.nib
.................\.................\.................\........\.........\README.rtf
.................\XcodeClientServer.xcodeproj
.................\....

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