I have a problem with my socket program.
I create the client program (my code is below)
I have a problem when i close the socket with the disconnect method.
CFSocketRef s;
-(void)CreaConnessione
{
CFSocketError errore;
struct sockaddr_in sin;
CFDataRef address;
CFRunLoopSourceRef source;
CFSocketContext context = { 0, self, NULL, NULL, NULL };
s = CFSocketCreate(
NULL,
PF_INET,
SOCK_STREAM,
IPPROTO_TCP,
kCFSocketDataCallBack,
AcceptDataCallback,
&context);
memset(&sin, 0, sizeof(sin));
int port = [fieldPorta.text intValue];
NSString *tempIp = fieldIndirizzo.text;
const char *ip = [tempIp UTF8String];
sin.sin_family = AF_INET;
sin.sin_port = htons(port);
sin.sin_addr.s_addr = (long)inet_addr(ip);
address = CFDataCreate(NULL, (UInt8 *)&sin, sizeof(sin));
errore = CFSocketConnectToAddress(s, address, 0);
if(errore == 0){
buttonInvioMess.enabled = TRUE;
fieldMessaggioInvio.enabled = TRUE;
labelTemp.text = [NSString stringWithFormat:#"Connesso al Server"];
CFRelease(address);
source = CFSocketCreateRunLoopSource(NULL, s, 0);
CFRunLoopAddSource(CFRunLoopGetCurrent(),
source,
kCFRunLoopDefaultMode);
CFRelease(source);
CFRunLoopRun();
}
else{
labelTemp.text = [NSString stringWithFormat:#"Errore di connessione. Verificare Ip e Porta"];
switchConnection.on = FALSE;
}
}
//the socket doesn't disconnect
-(void)Disconnetti{
CFSocketInvalidate(s);
CFRelease(s);
}
-(IBAction)Connetti
{
if(switchConnection.on)
[self CreaConnessione];
else
[self Disconnetti];
}
If you're trying to reuse the socket which you have invalidated. I guess you cant use the same socket object again.
because once i remove invalidating socket from my code. the code works pretty good on every single time i try to make connection after disconnecting..
Related
We have following code for connecting to our server. This is part of iPhone App.
Problem is that recv(CFSocketGetNative(inSocketRef), &length, sizeof(length), 0);
call returns 0 after exactly 60 sec. We are not sending anything from server. I want it to wait for data or disconnection (either server or client initiated). However, it always returns after 60 sec.
What am I doing wrong here?
void CallbackHandlerConnectionHandler(CFSocketRef inSocketRef, CFSocketCallBackType inType,
CFDataRef inAddress, const void *inData, void *inInfo)
{
ChatServerConnectionHandler *conHandler = (ChatServerConnectionHandler *)inInfo;
if([conHandler respondsToSelector:#selector(dataRecievedFromServer:)])
{
int res = 0;
SInt32 length;
res = recv(CFSocketGetNative(inSocketRef), &length, sizeof(length), MSG_PEEK);
if(0 >= res || (length < 0))
{
//Disconnect the connection, as some has occcured in the sockets..
[conHandler performSelector:#selector(errorEncountered)];
NSLog(#"Error occured in server!!");
return;
}
printf ("good data")
}
}
-(BOOL) connectToServer:(NSString *)ipAddress Port:(int)portNumber
{
connectionState = eConnectionEstablishInProgress;
self.threadStopped = NO;
CFRunLoopSourceRef source;
int sockfd;
struct sockaddr_in serv_addr;
struct hostent *host;
host = gethostbyname([ipAddress cStringUsingEncoding:NSUTF8StringEncoding]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
struct timeval timeout;
if (sockfd < 0)
{
error("ERROR opening socket");
connectionState = eNoConnection;
return NO;
}
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(portNumber);
serv_addr.sin_addr = *((struct in_addr *)host->h_addr);
bzero(&(serv_addr.sin_zero),8);
/* Creates a CFSocket object for a pre-existing native socket */
CFSocketContext socketContext={0,self,NULL,NULL,NULL};
socketRef = CFSocketCreateWithNative(kCFAllocatorDefault,
sockfd,
kCFSocketReadCallBack,
CallbackHandlerConnectionHandler,
&socketContext);
source = CFSocketCreateRunLoopSource(NULL, socketRef, 0);
CFRunLoopAddSource(CFRunLoopGetCurrent(), source, kCFRunLoopDefaultMode);
CFRelease(source);
source = nil;
InstallSignalHandlers();
CFDataRef socketAddress;
socketAddress = CFDataCreateWithBytesNoCopy(kCFAllocatorDefault, (UInt8 *)&serv_addr, sizeof(serv_addr), kCFAllocatorNull);
CFSocketError result=CFSocketConnectToAddress(socketRef, socketAddress, 0);
CFRelease(socketAddress);
if(kCFSocketSuccess == result)
{
//printf("Socket connection established");
self.serverRunning = YES;
connectionState = eConnectionEstablised;
NSLog(#"\nCall Connection accepted callback.");
if([delegate respondsToSelector:#selector(conectionEstablishedWithTheServer)])
{
[delegate performSelector:#selector(conectionEstablishedWithTheServer)];
}
}
else
{
//printf("Unable to create socket why???***");
connectionState = eNoConnection;
if(socketRef)
CFRelease(socketRef);
socketRef = nil;
return NO;
}
while(FALSE == self.threadStopped)
{
CFRunLoopRunInMode(kCFRunLoopDefaultMode, 1, FALSE);
}
NSLog(#"\nOut of Server socket connection thread.");
self.serverRunning = NO;
if([delegate respondsToSelector:#selector(conectionFinishedWithServer)])
{
[delegate performSelector:#selector(conectionFinishedWithServer)];
}
if(socketRef)
{
if(CFSocketIsValid(socketRef))
CFSocketInvalidate(socketRef);
}
return YES;
}
This looks like a server problem - or rather functionality: closing inactive connections to keep enough free resources.
If you didn't write the server code try to contact the author.
The packet you mention [FIN, ACK] is a packet that closes your socket: you should check the IP adresses but the server is most probably the initiator of this packet.
I have just started learning to design iphone apps and I am trying to set up a client server environment. As a starter I would like to first make sure that the service I publish is visible to the client. I have written server and client codes wit help from Apple's Docs. However I find that though my service is getting published (netServiceWillPublish(NSNetService *)sender is called), my client is not identifying this service. At the client's side the delegate function netServiceBrowserWillSearch:(NSNetServiceBrowser *)browser is called making me believe that the client is searching for the service. However the didFindService delegate function is never called. i am stumped as to why this is not working. I have followed the sample codes for the client side from various places and my code matches theirs. Some help on this would be greatly appreciated
Also I have the following questions
Can the service name (that comes along with the transport level protocol) be any string? Or does it have to be specified in http://www.dns-sd.org/ServiceTypes.html. Also what purpose does this solve apart from service discovery.
When I print out the details of the NSNetService object at the server's side (After setting up the socket and starting the service) the hostname is printed as (null) and there are no addresses being displayed. technically when a service is opened shouldn't these be set to values? If yes could someone please tell me where I am going wrong in my code?
I have attached the client and server code blocks of my project where the publishing and browsing of servicing is done. Help is extremely appreciated as I am stuck in my work with this issue.
This is the code snippet at the client side that browses for the services
NSNetServiceBrowser *serviceBrowser;
serviceBrowser = [[NSNetServiceBrowser alloc] init];
[serviceBrowser setDelegate:self];
[serviceBrowser searchForServicesOfType:#"_http._tcp." inDomain:#"local."];
This is the code snippet at the server side that publishes the service
BOOL success;
int fd;
int err;
int junk;
struct sockaddr_in addr;
NSInteger port;
port = 0;
fd = socket(AF_INET, SOCK_STREAM, 0);
success = (fd != -1);
if(success) {
memset(&addr, 0, sizeof(addr));
addr.sin_len = sizeof(addr);
addr.sin_family = AF_INET;
addr.sin_port = 0;
addr.sin_addr.s_addr = INADDR_ANY;
err = bind(fd, (const struct sockaddr*) &addr, sizeof(addr));
success = (err == 0);
}
if (success) {
err = listen(fd, 5);
success = (err == 0);
}
if (success) {
socklen_t addrLen;
addrLen = sizeof(addr);
err = getsockname(fd, (struct sockaddr *) &addr, &addrLen);
success = (err == 0);
if (success) {
assert( addrLen = sizeof(addr));
port = ntohs(addr.sin_port);
}
}
if (success) {
CFSocketContext context = { 0, (__bridge void *) self, NULL, NULL, NULL };
assert(self->_listeningSocket == NULL);
self->_listeningSocket = CFSocketCreateWithNative(NULL, fd, kCFSocketAcceptCallBack, AcceptCallBack, &context);
success = (self->_listeningSocket != NULL);
if (success) {
CFRunLoopSourceRef rls;
fd = -1; //listeningSocket is now responsible for closing the socket
rls = CFSocketCreateRunLoopSource(NULL, self.listeningSocket, 0);
assert(rls != NULL);
CFRunLoopAddSource(CFRunLoopGetCurrent(), rls, kCFRunLoopDefaultMode);
CFRelease(rls);
}
}
if (success) {
self.netService = [[NSNetService alloc] initWithDomain:#"local." type:#"_http._tcp." name:#"test" port:port];
success = (self.netService != nil);
}
if (success) {
self.netService.delegate = self;
[self.netService publishWithOptions:NSNetServiceNoAutoRename];
}
if (success) {
assert(port != 0);
[self serverDidStartOnPort:port];
}
else {
[self stopServer:#"Start Failed"];
if (fd != -1) {
junk = close(fd);
assert(junk == 0);
}
}
This is the code snippet that tells that the service is published and prints out the details of my NSSocket object
- (void)netServiceWillPublish:(NSNetService *)sender {
NSLog(#"This function is getting called");
NSLog(#"sender.name %#",sender.name);
NSLog(#"sender.addresses %#",sender.addresses);
NSLog(#"sender.domain %#",sender.domain);
NSLog(#"sender.hostname %#",sender.hostName);
NSLog(#"sender.type %#",sender.type);
NSLog(#"sender.port %d",sender.port);
}
Thanks
Vivek
I used the following method to get iphone mac address, but sometimes result is null. This problem can occur in what circumstances?
+(NSString *) macAddress{
int mib[6];
size_t len;
char *buf;
unsigned char *ptr;
struct if_msghdr *ifm;
struct sockaddr_dl *sdl;
mib[0] = CTL_NET;
mib[1] = AF_ROUTE;
mib[2] = 0;
mib[3] = AF_LINK;
mib[4] = NET_RT_IFLIST;
if ((mib[5] = if_nametoindex("en0")) == 0) {
printf("Error: if_nametoindex error/n");
return NULL;
}
if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
printf("Error: sysctl, take 1/n");
return NULL;
}
if ((buf = malloc(len)) == NULL) {
printf("Could not allocate memory. error!/n");
return NULL;
}
if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
printf("Error: sysctl, take 2");
return NULL;
}
ifm = (struct if_msghdr *)buf;
sdl = (struct sockaddr_dl *)(ifm + 1);
ptr = (unsigned char *)LLADDR(sdl);
NSString *outstring = [NSString stringWithFormat:#"%02x%02x%02x%02x%02x%02x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];
free(buf);
return [outstring uppercaseString];
}
bsd socket related functions won't activate iphone device's network capability
*if it is on 3g and has not used network for several minutes.
I had problem with dns retrieval and connect() with c socket call.
If your sometimes is when your phone is on 3g and turned off(no network activity) for a while, then I would guess it's the same problem.
How can i send image over socket in iPhone. I tried with string the code i used is as follows, now i need to send image over socket.
CFWriteStreamRef writeStream = NULL;
CFStringRef host = CFSTR("192.168.1.211");
UInt32 port = 8001;
CFStreamCreatePairWithSocketToHost(kCFAllocatorDefault, host, port, NULL, &writeStream);
CFWriteStreamSetProperty(writeStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
if(!CFWriteStreamOpen(writeStream)) {
NSLog(#"Error Opening Socket");
}
else{
UInt8 buf[] = "Abc";
int bytesWritten = CFWriteStreamWrite(writeStream, buf, strlen((char*)buf));
NSLog(#"Written: %d", bytesWritten);
if (bytesWritten < 0) {
CFStreamError error = CFWriteStreamGetError(writeStream);
}
}
Regards,
The image has to be converted to base64 string and transferred through socket.
Here is the code snippet for base-64 conversion in Objective c
- (NSString *)encodeToBase64String:(UIImage *)image {
return [UIImagePNGRepresentation(image) base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
}
Swift
let strBase64:String = imageData.base64EncodedStringWithOptions(.Encoding64CharacterLineLength)
Here is the reference
Essentially I'm sending data to a Java Socket Server from an iPhone app however something rather strange happens, it doesn't receive the data until the iPhone application is closed! I'm sure there is something I'm missing but I just can't seem to find it, it's all quite odd.
Here is how my connection is created:
-(CFSocketRef)initSocket {
CFSocketContext context = {
.version = 0,
.info = self,
.retain = NULL,
.release = NULL,
.copyDescription = NULL
};
sockety = CFSocketCreate(
kCFAllocatorDefault,
PF_INET,
SOCK_STREAM,
IPPROTO_TCP,
kCFSocketDataCallBack^kCFSocketConnectCallBack,
socketCallBack,
&context
);
uint16_t port = 4444;
struct sockaddr_in addr4;
memset(&addr4, 0, sizeof(addr4));
addr4.sin_family = AF_INET;
addr4.sin_len = sizeof(addr4);
addr4.sin_port = htons(port);
const char *ipaddress = "192.168.1.5";
inet_aton(ipaddress, &addr4.sin_addr);
NSData *address = [NSData dataWithBytes:&addr4 length:sizeof(addr4)];
CFSocketError error = CFSocketConnectToAddress(sockety, (CFDataRef)address, 1);
if(error != kCFSocketSuccess )
{
Faliure = YES;
}
else{
ViewNo = 2;
}
CFRunLoopSourceRef source;
source = CFSocketCreateRunLoopSource(NULL, sockety, 1);
CFRunLoopAddSource(CFRunLoopGetCurrent(), source, kCFRunLoopDefaultMode);
CFRelease(source);
return sockety;
}
Heres how the message is sent:
const char *sendStrUTF = [sentmessage UTF8String];
NSData *dataOut = [NSData dataWithBytes: sendStrUTF length: strlen(sendStrUTF)];
CFSocketSendData(sockety, NULL, (CFDataRef) dataOut, 0);
Any help would be greatly appreciated!
Thanks in advance,
Ozzie
Is your call to CFSocketSendData being done on a (blocked) GUI thread?
I would experiment with wrapping those 3 lines in a performSelectorInBackground / or after delay combinations.
NSData *dat=[stringToSend dataUsingEncoding:NSASCIIStringEncoding];
CFSocketError w =CFSocketSendData(_socket, NULL,(CFDataRef)dat, 0);
if (w==kCFSocketSuccess) {
NSLog(#"success");
}