CoreTelephony

2010-08-18T21:21:12Z

Sigmaris: Added example code to listen for incoming SMS messages

CoreTelephony is the iPhone framework used for high-level cell modem interaction. It handles SMS, MMS, phone calls, etc. It is written in C, C++, and in 3.0, Objective-C portions were added.

===Usage===
In order to use CoreTelephony, you need to set up your build environment to link against it. <br>
You also need a set of header files, which can be obtained by using the class-dump tool on the framework.

===C functions/types===

typedef struct __CTSMSMessage CTSMSMessage;

void* CTTelephonyCenterGetDefault();
void CTSMSMessageSend(void*,CTSMSMessage*);
CFStringRef CTSMSMessageCopyAddress(void *, CTSMSMessage *);
CFStringRef CTSMSMessageCopyText(void *, CTSMSMessage *);
CTSMSMessage* CTSMSMessageCreate(void*,CFStringRef number, CFStringRef name);

====Objective-C====
The ObjC parts are much easier to work with because of the magic of class-dump. The only work I've done is getting an SMS message sent out. This can be accomplished in one line of code:
[[CTMessageCenter sharedMessageCenter] sendSMSWithText:message serviceCenter:nil toAddress:number];
where message and number are NSStrings filled with the correct data.

=====Experimental code to listen for incoming SMS=====
<code>
static void callback(CFNotificationCenterRef center, void *observer, NSString* name, const void *object, NSDictionary* info) {
fprintf(stderr, "Notification intercepted: %s\n", [name UTF8String]);
if([name isEqualToString:@"kCTMessageReceivedNotification"] && info)
{
NSNumber* messageType = [info valueForKey:@"kCTMessageTypeKey"];
if([messageType isEqualToNumber:[NSNumber numberWithInt:1/*empirically determined!*/]])
{
NSNumber* messageID = [info valueForKey:@"kCTMessageIdKey"];
CTMessageCenter* mc = [CTMessageCenter sharedMessageCenter];
CTMessage* msg = [mc incomingMessageWithId:[messageID intValue]];
NSObject<CTMessageAddress>* phonenumber = [msg sender];

NSString *senderNumber = (NSString*)[phonenumber canonicalFormat];
NSString *sender = (NSString*)[phonenumber encodedString];
CTMessagePart* msgPart = [[msg items] objectAtIndex:0]; //for single-part msgs
NSData *smsData = [msgPart data];
NSString *smsText = [[NSString alloc] initWithData:smsData encoding:NSUTF8StringEncoding];
fprintf(stderr, "SMS Message from %s / %s: \"%s\"\n",[senderNumber UTF8String],[sender UTF8String],[smsText UTF8String]);
}
}
return;
}

int main(int argc, char **argv)
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

id ct = CTTelephonyCenterGetDefault();
CTTelephonyCenterAddObserver(ct, NULL, callback, NULL, NULL, CFNotificationSuspensionBehaviorHold);

// Start the run loop. Now we'll receive notifications.
[[NSRunLoop currentRunLoop] run];
[pool drain];
printf("Unexpectedly back from CFRunLoopRun()!\n");
[pool release];
}
</code>

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CoreTelephony