zebra barcode printer in vb.net Socket Connections in Objective-C

Printing QR Code ISO/IEC18004 in Objective-C Socket Connections

Socket Connections
QR Code ISO/IEC18004 Generator In Objective-C
Using Barcode creator for iPhone Control to generate, create QR Code 2d barcode image in iPhone applications.
www.OnBarcode.com
Create Data Matrix ECC200 In Objective-C
Using Barcode encoder for iPhone Control to generate, create Data Matrix ECC200 image in iPhone applications.
www.OnBarcode.com
You can use socket connections to provide an open connection between a device and a server, thereby removing the need to create a connection from scratch each time something needs to be sent or retrieved. When using sockets, a remote open socket is required for you to connect to, which to be of any use would have to be attached to an application that handles the gaming messages. To handle the gaming messages required in Swipe Interactive s Quick Draw and Pole2Pole games, I built a multiuser server, so in this chapter I will describe the socket connections as being between the device and a server. Developing one of these servers from scratch can be quite a difficult task and is not a subject that I can cover in this chapter. If you find yourself needing a multiuser server, then you can find many resources available on the topic online. Creating socket connections on the iPhone requires some more involved code than was needed for the previous methods of communicating, and as such, there are some concepts and functions included in this chapter for which you will need to look further than the iPhone SDK documentation to find detailed explanations of. The result of this extra work, however, will mean that you can communicate your gaming messages quickly and easily, resulting in much faster gaming. You can start by creating a socket connection to a known address and port using the Core Foundation CFSocket class, as shown in the SocketController class in Listing 8-4.
Barcode Creator In Objective-C
Using Barcode encoder for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
Draw EAN13 In Objective-C
Using Barcode generation for iPhone Control to generate, create GTIN - 13 image in iPhone applications.
www.OnBarcode.com
Listing 8-4. Connecting a Socket
Encode GS1 - 12 In Objective-C
Using Barcode generation for iPhone Control to generate, create UPC-A Supplement 2 image in iPhone applications.
www.OnBarcode.com
Barcode Maker In Objective-C
Using Barcode drawer for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
#import <netinet/in.h> #import <sys/socket.h> #import <arpa/inet.h>
Code 39 Full ASCII Generation In Objective-C
Using Barcode generator for iPhone Control to generate, create Code 39 image in iPhone applications.
www.OnBarcode.com
GTIN - 12 Creator In Objective-C
Using Barcode drawer for iPhone Control to generate, create UPC - E0 image in iPhone applications.
www.OnBarcode.com
CHAPTER 8: Networked Games: Choosing the Right Option
Quick Response Code Recognizer In .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Scanning QR Code JIS X 0510 In VB.NET
Using Barcode recognizer for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
@implementation SocketController -(CFSocketRef)initSocket { CFSocketContext context = { .version = 0, .info = self, .retain = NULL, .release = NULL, .copyDescription = NULL }; CFSocketRef socket = CFSocketCreate( kCFAllocatorDefault, PF_INET, SOCK_STREAM, IPPROTO_TCP, kCFSocketDataCallBack^kCFSocketConnectCallBack, // callBackTypes socketCallBack, // callBack function &context ); uint16_t port = 12345; 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 = "12.34.56.78"; inet_aton(ipaddress, &addr4.sin_addr); NSData *address = [NSData dataWithBytes:&addr4 length:sizeof(addr4)]; CFSocketConnectToAddress(socket, (CFDataRef)address, -1); CFRunLoopSourceRef source; source = CFSocketCreateRunLoopSource(NULL, socket, 1); CFRunLoopAddSource(CFRunLoopGetCurrent(), source, kCFRunLoopDefaultMode); CFRelease(source); return socket; } @end
Painting Matrix Barcode In Visual Studio .NET
Using Barcode creation for VS .NET Control to generate, create 2D image in .NET applications.
www.OnBarcode.com
Code 3 Of 9 Encoder In VS .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create Code 3/9 image in VS .NET applications.
www.OnBarcode.com
CHAPTER 8: Networked Games: Choosing the Right Option
EAN-13 Drawer In .NET
Using Barcode generation for Visual Studio .NET Control to generate, create EAN 13 image in .NET applications.
www.OnBarcode.com
PDF-417 2d Barcode Generator In Java
Using Barcode printer for BIRT Control to generate, create PDF 417 image in BIRT applications.
www.OnBarcode.com
The initSocket method in Listing 8-4 sets up the socket connection to a remote port (in this case I m using the address 12.34.56.78 and port 12345) and assigns a callback function called socketCallback to handle socket events. An important feature of the callback function is that you can choose which socket events will result in the callback function being called. You can see that I have chosen to have the callback function called when events of type kCFSocketDataCallBack or kCFSocketConnectCallBack occur, which (respectively) correspond to data being received by the socket and a new connection being made by the socket. You can find further details on these types, and the others available, in the iPhone SDK documentation. You now need to set up the callback function to handle the socket s connection status and incoming data callbacks. Note that in order to be able to call SocketController class methods from within socketCallback, .info is set as self in the socket context in Listing 8-4. This means that the SocketController property self is always passed to socketCallBack as the info parameter, allowing access back to the class methods. Listing 8-5 shows an example of a socket callback function.
Recognize Barcode In Visual C#
Using Barcode recognizer for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Generate Data Matrix In Visual Basic .NET
Using Barcode creator for .NET Control to generate, create DataMatrix image in VS .NET applications.
www.OnBarcode.com
Listing 8-5. Socket Callback Function to Deal with Socket Connection and Incoming Data
Reading PDF 417 In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
EAN13 Creation In Java
Using Barcode generation for BIRT Control to generate, create EAN 13 image in Eclipse BIRT applications.
www.OnBarcode.com
static void socketCallBack( CFSocketRef s, CFSocketCallBackType type, CFDataRef address, const void *dataIn, void *info ) { SocketController *socketController = (SocketController *) info; if(type==kCFSocketConnectCallBack) { if(dataIn) { SInt32 error = *((SInt32*)dataIn) ; printf("error code %d\n",error); } return; } if(type == kCFSocketDataCallBack) { unsigned char *dataBytes; dataBytes = [(NSMutableData *)dataIn mutableBytes]; [socketController dealWithData:dataBytes]; // deal with data in dataBytes } }
Painting Barcode In Java
Using Barcode creator for Android Control to generate, create Barcode image in Android applications.
www.OnBarcode.com
Making Code 128 Code Set C In C#.NET
Using Barcode generator for Visual Studio .NET Control to generate, create Code 128 image in Visual Studio .NET applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.