View source for CTIndicators

'''CTIndicators''' is an API in [[CoreTelephony.framework]] that can be used to get the signal strength, voicemail status, etc.

== Getting the cellular signal strength ==
The code below can be used to get the raw strength, graded strength as well as the number of bars (as seen in the status bar).
<source lang=c>
#include <CoreFoundation/CoreFoundation.h>
#include <CoreTelephony/CoreTelephony.h>

static void SignalStrengthDidChange(CFNotificationCenterRef center, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo)
{
	long int raw = 0;
	long int graded = 0;
	long int bars = 0;

	CTIndicatorsGetSignalStrength(&raw, &graded, &bars);

	printf("Signal strength changed! Raw: %li, graded: %li bars: %li\n", raw, graded, bars);
	// Prints something like:
	// Signal strength changed! Raw: -96, graded: 27 bars: 3
}

int main(int argc, char *argv[])
{
	// Register as a listener to the kCTIndicatorsSignalStrengthNotification notification to be notified when the signal strength changed.
	CTTelephonyCenterAddObserver(CTTelephonyCenterGetDefault(), NULL, SignalStrengthDidChange, kCTIndicatorsSignalStrengthNotification, NULL, CFNotificationSuspensionBehaviorCoalesce);

	// Get the initial strength.
	SignalStrengthDidChange();

	CFRunLoopRun();

	return 0;
}

</source>

== External links ==

* Header: https://github.com/Cykey/ios-reversed-headers/blob/master/CoreTelephony/CTIndicators.h

{{occlass|library=CoreTelephony.framework|navbox=1}}