Re: Big picture relationships between NSConnection, NSInputStream, NSOutputStream etc
Re: Big picture relationships between NSConnection, NSInputStream, NSOutputStream etc
- Subject: Re: Big picture relationships between NSConnection, NSInputStream, NSOutputStream etc
- From: Ken Tozier <email@hidden>
- Date: Thu, 4 Dec 2008 19:39:08 -0500
OK. After reading the docs on NSStream, here's what I came up with.
- (BOOL) openStreamsWithMode:(MySQLConnectMode) inMode
{
[NSStream getStreamsToHost: host port: port inputStream: &inStream
outputStream: &outStream];
if ((inStream != nil) && (outStream != nil))
{
connectMode = inMode;
[inStream retain];
[outStream retain];
[inStream setDelegate: self];
[outStream setDelegate: self];
[inStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:
NSDefaultRunLoopMode];
[outStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:
NSDefaultRunLoopMode];
[inStream open];
[outStream open];
NSLog(@"inputStream: %@, outputStream: %@", inStream, outStream);
return YES;
}
else
NSLog(@"Failed to open inputStream: %@, outputStream: %@", inStream,
outStream);
return NO;
}
- (void) stream:(NSStream *) inSender
handleEvent:(NSStreamEvent) inEvent
{
NSLog(@"Entered: stream:handleEvent: with sender: %@", inSender);
if (inSender == inStream)
{
switch (inEvent)
{
case NSStreamEventHasBytesAvailable:
NSLog(@"NSStreamEventHasBytesAvailable");
[self readInputStreamData];
break;
case NSStreamEventErrorOccurred:
NSLog(@"NSStreamEventErrorOccurred: %@", [inStream streamError]);
break;
case NSStreamEventEndEncountered:
NSLog(@"NSStreamEventEndEncountered");
[self processStreamData];
break;
}
}
}
I tried it out and got the following printout to the console
> inputStream: <NSCFInputStream: 0x13d170>, outputStream:
<NSCFOutputStream: 0x13d1e0>
> connection: <MySQLConnection: 0x824800>
> Entered: stream:handleEvent: with sender: <NSCFInputStream: 0x13d170>
> NSStreamEventErrorOccurred: Error Domain=NSPOSIXErrorDomain Code=61
"Operation could not be completed. Connection refused"
> Entered: stream:handleEvent: with sender: <NSCFOutputStream:
0x13d1e0>
Which seems to make sense because MySQL requires a handshake and
NSSocket doesn't know how to respond to that handshake. To perform the
handshake, it seems I need to descend into BSD sockets.
Looking at the "Picture browser" example project shows how to set up a
socket for listening, but not how to set one up to send the initial
connect request to a remote process
int fdForListening;
struct sockaddr_in serverAddress;
socklen_t namelen = sizeof(serverAddress);
// In order to use NSFileHandle's acceptConnectionInBackgroundAndNotify
// method, we need to create a file descriptor that is itself a socket,
// bind that socket, and then set it up for listening. At this point,
// it's ready to be handed off to acceptConnectionInBackgroundAndNotify.
if((fdForListening = socket(AF_INET, SOCK_STREAM, 0)) > 0)
{
memset(&serverAddress, 0, sizeof(serverAddress));
serverAddress.sin_family = AF_INET;
serverAddress.sin_addr.s_addr = htonl(INADDR_ANY);
serverAddress.sin_port = 0; // allows the kernel to choose the port
for us.
if(bind(fdForListening, (struct sockaddr *) &serverAddress,
sizeof(serverAddress)) < 0)
{
close(fdForListening);
return;
}
// Find out what port number was chosen for us.
if(getsockname(fdForListening, (struct sockaddr *) &serverAddress,
&namelen) < 0)
{
close(fdForListening);
return;
}
chosenPort = ntohs(serverAddress.sin_port);
if(listen(fdForListening, 1) == 0)
{
handshakeSocket = [[NSFileHandle alloc] initWithFileDescriptor:
fdForListening closeOnDealloc: YES];
}
}
I gather from that, I need to set the following serverAddress fields
differently but after looking at "in.h" none of the "INADDR_xxx" modes
jump out at me
serverAddress.sin_family = AF_INET;
serverAddress.sin_addr.s_addr = htonl(INADDR_ANY);
serverAddress.sin_port = 0; // allows the kernel to choose the port
for us.
Which should I use "IN_CLASSA_HOST," "IN_CLASSB_HOST," other?
How does one set up a file descriptor for an initial connect request
to a remote process?
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| References: | |
| | >Big picture relationships between NSConnection, NSInputStream, NSOutputStream etc (From: Ken Tozier <email@hidden>) |
| | >Re: Big picture relationships between NSConnection, NSInputStream, NSOutputStream etc (From: John Pannell <email@hidden>) |
| | >Re: Big picture relationships between NSConnection, NSInputStream, NSOutputStream etc (From: Ken Tozier <email@hidden>) |
| | >Re: Big picture relationships between NSConnection, NSInputStream, NSOutputStream etc (From: "Michael Ash" <email@hidden>) |
| | >Re: Big picture relationships between NSConnection, NSInputStream, NSOutputStream etc (From: Ken Tozier <email@hidden>) |
| | >Re: Big picture relationships between NSConnection, NSInputStream, NSOutputStream etc (From: "Michael Ash" <email@hidden>) |