Question

I want to convert a UIImage to an NSOutputStream and send it to a server through socket.

 #import 'Connection.h'  @implementation Connection  -(void) open: (NSString *) h : (int) p {     strHost = h;     intPort = p;      [NSStream getStreamsToHost:objHost                 port:intPort             inputStream:&receiveStream             outputStream:&sendStream];      [receiveStream retain];     [sendStream retain];      [receiveStream setDelegate:self];     [sendStream setDelegate:self];      [receiveStream scheduleInRunLoop:[NSRunLoop currentRunLoop]                 forMode:NSDefaultRunLoopMode];     [sendStream scheduleInRunLoop:[NSRunLoop currentRunLoop]                forMode:NSDefaultRunLoopMode];      [receiveStream open];     [sendStream open];      printf('Open.\n'); }   - (void) stream: (NSStream *) stream handleEvent: (NSStreamEvent) eventCode {     printf('EVENT: Start.\n');      switch(eventCode)     {         case NSStreamEventOpenCompleted:         {             printf('EVENT: Open completed.\n');              if(stream == receiveStream)             {                 printf('Receiving...\n');             }              if(stream == sendStream)             {                 printf('Sending...\n');                  NSString * strBuffer = [NSString stringWithFormat:@'GET / HTTP/1.0\r\n\r\n'];                 const uint8_t * rawstring = (const uint8_t *)[strBuffer UTF8String];                  [sendStream write:rawstring maxLength:strlen(rawstring)];             }              break;         }         case NSStreamEventEndEncountered:         {             printf('EVENT: End encountered.\n');             break;         }         case NSStreamEventHasSpaceAvailable:         {             printf('EVENT: Has space available.\n');             break;         }         case NSStreamEventHasBytesAvailable:         {             printf('EVENT: Has bytes available.\n');             break;         }         case NSStreamEventErrorOccurred:         {             printf('EVENT: Error occurred.\n');             break;         }         case NSStreamEventNone:         {             printf('EVENT: None.\n');             break;         }     }      printf('EVENT: End.\n'); }  -(void) close {     [receiveStream close];     [sendStream close];      printf('Closed.\n'); }  @end   

My question is where can I add code like ‘sendStream = …’?

Another question is that I can convert UIImage to NSData using:

NSData *imageData = UIImageJPEGRepresentation(imageView.image, 90);

But how to convert the imageData to NSOutputStream’s instance?

Answer 1

My question is where can I add code like ‘sendStream = …’?

You’re already assigning sendStream with the getStreamsToHost:port:inputStream:outputStream: message. That method returns the two streams by reference.

… how to convert the imageData to NSOutputStream’s instance?

You don’t need to convert the data to a stream, you need to tell a stream to write the data.

Try NSOutputStream’s write:maxLength: method. You’ll need to pass the bytes and length from the data object.