You can also create an instance of NSData from the contents of a file. Add two lines to your program:
#import <Foundation/Foundation.h>
int main (int argc, const char * argv[])
{
@autoreleasepool {
NSURL *url = [NSURL URLWithString:
@"http://www.google.com/images/logos/ps_logo2.png"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
NSError *error;
// This method will block until all the data has been fetched
NSData *data = [NSURLConnection sendSynchronousRequest:request
returningResponse:NULL
error:&error];
if (!data) {
NSLog(@"fetch failed: %@", [error localizedDescription]);
return 1;
}
NSLog(@"The file is %lu bytes", [data length]);
BOOL written = [data writeToFile:@"/tmp/google.png"
options:NSDataWritingAtomic
error:&error];
if (!written) {
NSLog(@"write failed: %@", [error localizedDescription]);
return 1;
}
NSLog(@"Success!");
NSData *readData = [NSData dataWithContentsOfFile:@"/tmp/google.png"];
NSLog(@"The file read from the disk has %lu bytes", [readData length]);
}
return 0;
}
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