Cocoa NSOutputStream send to a connection
- by Chuck
Hi,
I am new to Cocoa, but managed to get a connection (to a FTP) up and running, and I've set up an eventhandler for the NSInputStream iStream to alert every response (which also works).
What I manage to get is simply the hello message and a connection timeout 60 sec, closing control connection.
After searching stackoverflow and finding a lot of NSOutputStream write problems (e.g. http://stackoverflow.com/questions/703729/how-to-use-nsoutputstreams-write-message) and a lot of confusion in my google hits, I figured I'd try to ask my own question:
I've tried reading the developer.apple.com doc on OutputStream, but it seems almost impossible for me to send some data (in this case just a string) to the "connection" via the NSOutputStream oStream.
- (IBAction) send_something: sender
{
const char *send_command_char = [@"USER foo" UTF8String];
send_command_buffer = [NSMutableData dataWithBytes:send_command_char length:strlen(send_command_char) + 1];
uint8_t *readBytes = (uint8_t *)[send_command_buffer mutableBytes];
NSInteger byteIndex = 0;
readBytes += byteIndex;
int data_len = [send_command_buffer length];
unsigned int len = ((data_len - byteIndex >= 1024) ?
1024 : (data_len-byteIndex));
uint8_t buf[len];
(void)memcpy(buf, readBytes, len);
len = [oStream write:(const uint8_t *)buf maxLength:len];
byteIndex += len;
}
the above seems not to result in any useable events. typing it under NSStreamEventHasSpaceAvailable sometimes give a response if I spam the ftp by keep creating new connection instances and keep sending some command whenever oStream has free space. In other words, nothing "right" and so I'm still unclear how to properly send a command to the connection. Should I open - write - close every time i want to write to oStream (and thus to the ftp) and can I then expect a reply (hasBytesAvailable event on iStream)?
For some reason I find it very difficult to find any clear tutorials on this matter. Seems like there are more than a few in the same position as me: unclear how to use oStream write?
Any little bit that can help clear this up is greatly appreciated!
If needed I can write the rest of the code.
Chuck
