ping vers un port de serveur à partir de l'iPhone?

Question

Comment puis-je ping à un port serveur à partir d'Objective C (iPhone)? ..

Answer 1

Tout d'abord vous shoud regarder cette question

How to write a simple Ping method in Cocoa/Objective-C

puis

C Sockets Ping Command?

http://en.wikipedia.org/wiki/Internet_Control_Message_Protocol

http://www.kernelthread.com/projects/hanoi/html/icmp.html

http://www.programmersheaven.com/download/2417/download.aspx

Et je trouve ce code ..

How to write a simple Ping method in Cocoa/Objective-C 

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How to write a simple Ping method in Cocoa/Objective-C 

Question: How to write a simple Ping method in Cocoa/Objective-C 
I need to write a simple ping method in Cocoa/Objective-C. It also needs to work on the iPhone. I found an example that uses icmp , will this work on the iPhone? I'm leaning towards a solution using NSNetServices , is this a good idea? The method only needs to ping a few times and return the average and -1 if the host is down or unreachable. 
avatar rjstelling 

Autor: rjstelling 
Utworzono: 28 Apr 2009 
Language: question language en 
Answers: 
1. The code below seems to be working synchronously: const char *hostName = [@"stackoverflow.com" cStringUsingEncoding:NSASCIIStringEncoding]; SCNetworkConnectionFlags flags = 0; if (SCNetworkCheckReachabilityByName(hostName, &flags) && flags > 0) { NSLog(@"Host is reachable: %d", flags); } else { NSLog(@"Host is unreachable"); } Note: SystemConfiguration.framework is required 
2. Let me try this again...this time logging in, and formatting better ;-) StreamSCNetworkCheckReachabilityByName is deprecated and NOT available for the iPhone. bool success = false; const char *host_name = [@"stackoverflow.com" cStringUsingEncoding:NSASCIIStringEncoding]; SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(NULL, host_name); SCNetworkReachabilityFlags flags; success = SCNetworkReachabilityGetFlags(reachability, &flags); bool isAvailable = success && (flags & kSCNetworkFlagsReachable) && !(flags & kSCNetworkFlagsConnectionRequired); if (isAvailable) { NSLog(@"Host is reachable: %d", flags); }else{ NSLog(@"Host is unreachable"); } Note: SystemConfiguration.framework is required 
3. Look into CFHost and in particular CFHostGetReachability . There is sample CFHost code available, as well, which includes a routine to check host availability. 
4. You are not missing anything -- "Reachability" doesn't actually test that the target domain is in fact reachable, it only assesses if there is a pathway out of the machine by which the target domain is potentially reachable. So long as you have some outbound connection (e.g., an active wirless or wired connection), and a routing configuration that leads to the target, then the site is "reachable" as far as SCNetworkReachability is concerned. 
5. i tested with IP address but it not works properly: result is always YES! is it possibile that do not exist a simple echo with timeout class? 
6. Hi, Please take note that there is an difference between the simulator and the actual iPhone. The simulator is not a true simulator like the one supplied by Android, it uses Mac OSX classes for most of the functions. This is particularly hell if there is a difference between the Mac OSX and iPhonew(for example the keychain). 
7. The answer Gene Myers posted works using "SCNetworkReachabilityCreateWithName" for me - but only in the simulator. On my device (iPod w/OS 2.2.1) it always returns "Host is reachable" even for nonsense addresses like "zzz". Am I misunderstanding something? Thanks. Here's my code just in case: From https://stackoverflow.com/questions/798454/how-to-write-a-simple-ping-method-in-cocoa-objective-c - (IBAction) TestReachability:(id)sender { bool success = false; const char *host_name = [ipAddressText.textcStringUsingEncoding:NSASCIIStringEncoding]; NSString *imageConnectionSuccess = @"Connected.png"; NSString *imageConnectionFailed = @"NotConnected.png"; SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(NULL, host_name); SCNetworkReachabilityFlags flags; success = SCNetworkReachabilityGetFlags(reachability, &flags); bool isAvailable = success && (flags & kSCNetworkFlagsReachable) && !(flags & kSCNetworkFlagsConnectionRequired); if (isAvailable) { NSLog([NSString stringWithFormat: @"'%s' is reachable, flags: %x", host_name, flags]); [imageView setImage: [UIImage imageNamed:imageConnectionSuccess]]; } else { NSLog([NSString stringWithFormat: @"'%s' is not reachable", host_name]); [imageView setImage: [UIImage imageNamed:imageConnectionFailed]]; } } 
8. Pinging on the iPhone works a bit different than on other platforms, due to the fact that you don't have root access. See this sample code from Apple. 

Answer 2

réponse simple ..

Utilisez le programme SimplePing pour Mac OS ..

Remplacer le FrameWork CFNetwork pour MAC en cela à l'iPhone CFNetwork FrameWork .....

et exécuter le programme ....

Rappelez-vous, démarrer le projet que l'iPhone, puis Copier SimplePing.h .m et copier les codes de votre MAin View Controller ....

Remplacer cette principale fonction main.m (ci-dessous) (code bootom StartPinging)

enter code here 

int main(int argc, char* argv[]) 
{ 
    #pragma unused(argc) 
    #pragma unused(argv) 
    NSAutoreleasePool * pool; 
    Main *    mainObj; 

    pool = [[NSAutoreleasePool alloc] init]; 
    assert(pool != nil); 

    if (argc == 2) { 
     mainObj = [[[Main alloc] init] autorelease]; 
     assert(mainObj != nil); 

     [mainObj runWithHostName:[NSString stringWithUTF8String:"www.google.com"]]; 
    } else { 
     fprintf(stderr, "usage: %s host\n", getprogname()); 
    } 

    [pool drain]; 

    // On success we loop forever in -runWithHostName:, so the only way to 
    // get here is if something went wrong. 

    return EXIT_FAILURE; 
} 

-(void) startPinging 
{ 

    NSAutoreleasePool * pool; 
    Main *    mainObj; 

    pool = [[NSAutoreleasePool alloc] init]; 
    assert(pool != nil); 


     mainObj = [[[Main alloc] init] autorelease]; 
     assert(mainObj != nil); 

     [mainObj runWithHostName:[NSString stringWithUTF8String:"www.google.com"]]; 
    } 

    [pool drain]; 

    // On success we loop forever in -runWithHostName:, so the only way to 
    // get here is if something went wrong. 


} 

Connectez cette méthode startpinging à votre bouton ..

Answer 3

J'ai eu ce même problème, et a fini par écrire une simple enveloppe autour SimplePing à réaliser ceci, a écrit un blog à ce sujet et il y a tellement moi le code sur github, j'espère aidera quelqu'un ici:

http://splinter.com.au/how-to-ping-a-server-in-objective-c-iphone