The program compiles and runs without any errors but fails to receive any data from http://www.gutenberg.org/cache/epub/205/pg205.txt
I’m stumped as to why it doesn’t work.
BNRLogger.h:
#import <Foundation/Foundation.h>
@interface BNRLogger : NSObject
<NSURLConnectionDelegate, NSURLConnectionDataDelegate>
{
NSMutableData *incomingData;
}
@property (nonatomic) NSDate *lastTime;
- (NSString *) lastTimeString;
- (void) updateLastTime: (NSTimer *)t;
- (void) connection:(NSURLConnection *)connection didRecieveData:(NSData *)data;
- (void) connectionDidFinishLoading:(NSURLConnection *)connection;
- (void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error;
@endBNRLogger.m
#import "BNRLogger.h"
@implementation BNRLogger
- (NSString *) lastTimeString
{
static NSDateFormatter *dateFormatter = nil;
if (!dateFormatter) {
dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeStyle:NSDateFormatterMediumStyle];
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
NSLog(@"created dateFormatter");
}
return [dateFormatter stringFromDate:self.lastTime];
}
- (void) updateLastTime:(NSTimer *)t
{
NSDate *now = [NSDate date];
[self setLastTime:now];
NSLog(@"Just set time to %@", self.lastTimeString);
}
// Called each time a chunk of data arrives
- (void) connection:(NSURLConnection *)connection didRecieveData:(NSData *)data
{
NSLog(@"received %lu bytes", [data length]);
// Create a mutable data buffer if it doesn't already exist
if (!incomingData) {
incomingData = [[NSMutableData alloc] init];
}
[incomingData appendData:data];
}
// Called when the last chunk of data has been processed
- (void) connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(@"Got it all!");
NSString *string = [[NSString alloc] initWithData:incomingData encoding:NSUTF8StringEncoding];
incomingData = nil;
NSLog(@"string received has %lu characters", [string length]);
// uncomment the next line to see the entire fetched file:
// NSLog(@"The whole string is %@", string);
}main.m
#import <Foundation/Foundation.h>
#import "BNRLogger.h"
int main(int argc, const char * argv[])
{
@autoreleasepool {
BNRLogger *logger = [[BNRLogger alloc] init];
NSURL *url = [NSURL URLWithString:@"http://www.gutenberg.org/cache/epub/205/pg205.txt"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
__unused NSURLConnection *fetchConn = [[NSURLConnection alloc] initWithRequest:request delegate:logger startImmediately:YES];
__unused NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:logger selector:@selector(updateLastTime:) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] run];
}
return 0;
}