CODEWITHSUNDEEP
iosobjective-cnetwork-programming
user299648
user299648

Reputation: 2789

Cannot write to NSOutputStream immediately after it is open?

I am learning iOS network programming from this tutorial. I tried modifying the code so that a response is sent to the server immediately after a connection is successful. The only part of the code I change is in this function. The problem is that the app stalls and nothing happens on the line [outputStream write:[data bytes] maxLength:[data length]]; Thus NSLog(@"sent test"); does not get executed. What am I doing wrong?

- (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent {       
    NSLog(@"stream event %i", streamEvent);
    switch (streamEvent) {
        case NSStreamEventOpenCompleted:
            NSLog(@"Stream opened");

            //my code
            if (theStream == outputStream) {
                NSLog(@"outputStream");                                
                NSData* data = [NSData dataWithBytes:@"test" length:4];
                [outputStream write:[data bytes] maxLength:[data length]];
                NSLog(@"sent test");
            } //end my code

            break;
        case NSStreamEventHasBytesAvailable:
            if (theStream == inputStream) {
                uint8_t buffer[1024];
                int len;
                while ([inputStream hasBytesAvailable]) {
                    len = [inputStream read:buffer maxLength:sizeof(buffer)];
                    //...
                }
            }
            break;
        case NSStreamEventErrorOccurred:
            NSLog(@"Can not connect to the host!");
            break;
        case NSStreamEventEndEncountered:
            [theStream close];
            [theStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
            [theStream release];
            theStream = nil;
            break;
        default:
            NSLog(@"Unknown event");
    }
}

EDIT: solution found here How to use NSOutputStream's write message?

Upvotes: 3

Views: 5127

Answers (1)

meth
meth

Reputation: 1885

ok while i was working with raw socket connections i have used that code to send data to server. it might be helpful to you

if (theStream == outputStream) {
        NSData* data = [str dataUsingEncoding:NSUTF8StringEncoding];//str is my string to send
        int byteIndex = 0;
        uint8_t *readBytes = (uint8_t *)[data bytes];
        readBytes += byteIndex; // instance variable to move pointer
        int data_len = [data length];
       // NSLog(@"%i",[data length]);
        unsigned int len = ((data_len - byteIndex >= 1024) ?
                            1024 : (data_len-byteIndex));
        uint8_t buf[len];
        (void)memcpy(buf, readBytes, len);
        len = [outputStream write:(const uint8_t *)buf maxLength:len];
        byteIndex += len;

}

Upvotes: 1

Related Questions