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POBonjour Networking Help on iPhone WiTap sample
 

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  1. POBonjour Networking Help on iPhone WiTap sample
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    <p>I can follow most of Apple's WiTap sample, but am sort of stumped on this bit in the send method:</p> <pre><code>- (void) send:(const uint8_t)message { if (_outStream &amp;&amp; [_outStream hasSpaceAvailable]) if([_outStream write:(const uint8_t *)&amp;message maxLength:sizeof(const uint8_t)] == -1) [self _showAlert:@"Failed sending data to peer"]; } - (void) activateView:(TapView*)view { NSLog(@"ACTIVATE TAG: %d", [view tag]); //[self send:[view tag] | 0x80]; [self send:[view tag]]; } - (void) deactivateView:(TapView*)view { NSLog(@"DEACTIVATE TAG: %d", [view tag]); //[self send:[view tag] &amp; 0x7f]; [self send:[view tag]]; } </code></pre> <p>Note that I have changed the send: argument to just the tag of the views, which are numbered 1-9. Originally the code had the bitwise AND and OR adjustments.</p> <p>WHY?</p> <p>I get the fact that the send method needs a <code>uint8_t</code>, but is that why the bitwise stuff is there? To turn a NSInteger into a unint8_t?</p> <p>The code doesn't work with my changes above. It will log fine and visually the client will function correctly, but the messages aren't being sent/received correctly from client to client.</p> <p>Can someone explain in small words what the bitwise stuff is doing? Or am I correct?</p> <p>Thanks! This is my first question to SO so please be kind. </p> <hr> <p>thanks for the response. I am still puzzled a bit. Get it?</p> <p>Basically, why?</p> <p>Is this just a geeky way of passing an identifier? Each of those views have a tag #, why not just pass that, and toggle the state (up/down) from the view class?</p> <p>Is this just a case of "this is how the person who wrote it did it", or am I missing a crucial piece of the puzzle in that this is how I should also be structuring my code.</p> <p>I would just want to pass a tag # and then have that tag decide what to do in a clearly readable function like <code>toggleUpOrDownState</code> or something.</p> <p>This bitwise stuff always makes me feel stupid I guess, unless it is necessary, etc. Then I feel stupid but manage to muddle through somehow anyway. : )</p>
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