How to communicate between applications in iOS? - ios

Question

Before we can use CFMessagePort, but now it's invalid for iOS7 and above, is there any replaced methods? I tried CFMessagePort when hooking the constructor of UIApplication in the jailbreak environment, but in most of the apps, it can't CFMessagePortCreateLocal successfully, it just return NULL.Am I wrong somewhere?
static void setupUIApplicationMessagePort()
{
NSString *identifier = #"com.foo.foo.UIApplication";
CFMessagePortRef local = CFMessagePortCreateLocal(NULL, (__bridge CFStringRef)identifier, callBackForUIApplication, NULL, NULL);
if (local) {
NSLog(#"local OK: %#", local);
CFRunLoopSourceRef source = CFMessagePortCreateRunLoopSource(NULL, local, 0);
CFRunLoopAddSource(CFRunLoopGetCurrent(), source, kCFRunLoopCommonModes);
rocketbootstrap_cfmessageportexposelocal(local);
} else {
NSLog(#"local is NULL"); // in most of the apps it returns NULL
}
}
%ctor {
if(%c(UIApplication)) {
setupUIApplicationMessagePort();
}
}

Answer 1

try CFNotificationCenter using CFNotificationCenterGetDarwinNotifyCenter
#include <CoreFoundation/CFNotificationCenter.h>
/* This function will be called whatever a notification posted with the specified name */
void NotificationCallback(CFNotificationCenterRef center, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo){
}
void addObserver(){
CFStringRef name = CFSTR("NotificationName");
CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(),&NotificationCallback,name,NULL,CFNotificationSuspensionBehaviorDeliverImmediately);
}
This will listen to notifications named NotificationName
To post a notification
void postNotification(){
CFStringRef name = CFSTR("NotificationName");
/* You have to create the userInfo dictionary and add all the keys to it */
CFDictionaryRef userInfo;
CFNotificationCenterPostNotification(CFNotificationCenterGetDarwinNotifyCenter(), name, NULL, userInfo, true);
}