High-throughput, synchronous Objective-C wrapper around BSD sockets for iOS and macOS.
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A high-throughput, synchronous Objective-C wrapper around BSD sockets for iOS and macOS. Send and receive raw bytes over a socket as fast as possible. Includes methods for transferring files while optionally computing a checksum for verification. Swift compatible.

Use this class if fast network communication is what you need. If you want to do something else while your network operations finish, then an asynchronous API might be better.

For more information, please visit the project homepage. FastSocket is also available as a CocoaPod.


Download the latest release of FastSocket or try the nightly version.


Create and connect a client socket.

FastSocket *client = [[FastSocket alloc] initWithHost:@"localhost" andPort:@"34567"];
[client connect];

Send a file.

long sent = [client sendFile:@"/tmp/filetosend.txt"];

Receive a file of a given length.

long received = [client receiveFile:@"/tmp/newlyreceivedfile.txt" length:1024];

Send a string.

NSData *data = [@"test" dataUsingEncoding:NSUTF8StringEncoding];
long count = [client sendBytes:[data bytes] count:[data length]];

Receive a string.

char bytes[expectedLength];
[client receiveBytes:bytes count:expectedLength];
NSString *received = [[NSString alloc] initWithBytes:bytes length:expectedLength encoding:NSUTF8StringEncoding];

Send raw bytes.

char data[] = {42};
long sent = [client sendBytes:data count:1];

Receive available raw bytes up to the given limit.

char data[42];
long received = [client receiveBytes:data limit:42];

Receive the exact number of raw bytes given.

char data[1000];
long received = [client receiveBytes:data count:1000];

Close the connection.

[client close];

Please check out the unit tests for more examples of how to use these classes.


Daniel Reese @dreese


FastSocket is available under the MIT license.