Objective-C

Duplicate Python websockets

See more WebSocket Examples

Demonstrates how to duplicate the following Python client-side websocket snippet:

async with websockets.connect('ws://192.168.1.35/websocket') as websocket:
await websocket.send("http.controller_login:username=xxx&password=xxxxx")
response = await websocket.recv()

Objective-C

#import <CkoRest.h>
#import <CkoWebSocket.h>
#import <NSString.h>

BOOL success = NO;

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// In Python, the following line of code does more than just connect:
// 
//      websockets.connect('ws://192.168.1.35/websocket')
// 
// It is connecting to 192.168.1.35 without using TLS.  If the URI starts with "wss://", then TLS should be used.
// But this URI begins with just "ws:/", so no TLS.

// Also, after connecting, a GET request is sent to the /websocket endpoint.
// In summary, the websockets.connect function is establishing the connection and it sends a GET request.

// First establish the connection.
// No TLS, use the default HTTP port 80.
CkoRest *rest = [[CkoRest alloc] init];
success = [rest Connect: @"192.168.1.35" port: [NSNumber numberWithInt: 80] tls: NO autoReconnect: NO];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

CkoWebSocket *ws = [[CkoWebSocket alloc] init];

// Tell the WebSocket to use this connection.
success = [ws UseConnection: rest];
if (success != YES) {
    NSLog(@"%@",ws.LastErrorText);
    return;
}

// Add the standard WebSocket open handshake headers that will be needed.
// (This adds the required HTTP request headers to the rest object.)
[ws AddClientHeaders];

// Now send the GET request to /websockets.
NSString *responseBody = [rest FullRequestNoBody: @"GET" uriPath: @"/websockets"];
if (rest.LastMethodSuccess != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// If successful, the HTTP response status code should be 101,
// and the response body will be empty. (If it failed, we'll have a look
// at the response body..)
int statusCode = [rest.ResponseStatusCode intValue];
NSLog(@"%@%d",@"Response status code: ",statusCode);

if (statusCode != 101) {
    NSLog(@"%@",responseBody);
    NSLog(@"%@",@"-- Failed because of unexpected response status code.");
    return;
}

// We have the expected 101 response, so let's now validate the 
// contents of the response.
success = [ws ValidateServerHandshake];
if (success != YES) {
    NSLog(@"%@",ws.LastErrorText);
    return;
}

NSLog(@"%@",@"WebSocket connection successful.");

// The application may now begin sending and receiving frames on the WebSocket connection.

// The 1st frame sent by the Python snippet is:
// 
//     websocket.send("http.controller_login:username=xxx&password=xxxxx")
// 

// Send the same using Chilkat, and get the response.
BOOL finalFrame = YES;
success = [ws SendFrame: @"http.controller_login:username=xxx&password=xxxxx" finalFrame: finalFrame];
if (success != YES) {
    NSLog(@"%@",ws.LastErrorText);
    return;
}

// Read an incoming frame.
success = [ws ReadFrame];
if (success != YES) {
    NSLog(@"%@",@"Failed to receive a frame");
    NSLog(@"%@%d",@"ReadFrame fail reason = ",[ws.ReadFrameFailReason intValue]);
    NSLog(@"%@",ws.LastErrorText);
    return;
}

// Show the string that was received.
NSString *receivedStr = [ws GetFrameData];
NSLog(@"%@%@",@"Received: ",receivedStr);

// Continue with whatever additional communications are desired...
// ....
//