>I want to build my first network application. This application will be on
>several computers at my workplace. I want to send NSData objects between
>these computers. Each terminal will create NSData objects and send them to
>one central computer for further processing.
Here are some snippets to get started. Don't complain if they don't compile :-) This gives you the basic stuff you need to handle asynch data downloads.
JR
// Start up the connection
NSString * updateURLStr = @"http://somesite.com";;
NSURL* theURL = [NSURL URLWithString: [updateURLStr stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]];
NSURLRequest *theRequest=[NSURLRequest requestWithURL:theURL cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval: kTimeOutInterval];
myConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
// These methods are called for the connection delegate
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
// release the data object and connection
[self cleanUpConnection];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[self setProgressMax: [response expectedContentLength]]; // set progress bar max....
myConnection = [connection retain];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// append the new data to my file handle
if (myFileHandle != nil)
{
@try{
[myFileHandle writeData:data];
}
@catch(NSException *exception)
{
[self showDiskErr];
}
[self setProgressValue: [myFileHandle offsetInFile]];
}
}
// We done downloading, finish handling the data
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[self cleanUpConnection];
// do something with the file that holds the downloaded data
[[NSWorkspace sharedWorkspace] openFile:mySavedFilePath];
// Let caller know that it completed successfully
[downloadCaller downloadFinished:YES];
}
// _________________________________________________________________
// We done downloading, finish handling the data
- (void)cleanUpConnection
{
[myFileHandle closeFile];
[myFileHandle release];
myFileHandle = nil;
[myConnection release];
myConnection = nil;
}
// _________________________________________________________________
- (IBAction) cancelDownload:(id) sender
{
[myConnection cancel];
[self cleanUpConnection];
[[NSFileManager defaultManager] removeFileAtPath:mySavedFilePath handler:nil];
[[self window] close];
[downloadCaller downloadFinished:NO];
}
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