How to save downloaded data to device's filesystem - iphone

Question

I'm downloading pdf documents from the server:
- (void)downloadSingleDocument:(NSURL *)url
{
[pdfData release];
pdfData = [[NSMutableData alloc] init];
NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url];
[req addValue:#"Basic **************=" forHTTPHeaderField:#"Authorization"];
downloadConnection = [[NSURLConnection alloc] initWithRequest:req delegate:self startImmediately:YES];
}
- (void)connection:(NSURLConnection *)conn didReceiveData:(NSData *)data
{
NSLog(#"Connection did receive data");
[pdfData appendData:data];
}
On connectionDidFinishLoading I want to save downloaded pdf file to filesystem in Documents directory with the same filename as it was on the server.
What is the best way to do it?

Answer 1

Use this methods if you have large file:
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse*)response
{
filepath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:save_name];
[[NSFileManager defaultManager] createFileAtPath:filepath contents:nil attributes:nil];
file = [[NSFileHandle fileHandleForUpdatingAtPath:filepath] retain];// Here file is object of NSFileHandle and its declare in .h File
[file seekToEndOfFile];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[file seekToEndOfFile];
[file writeData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection*)connection
{
[file closeFile];
// After you download your data. you can copy your data from here to filesystem. and remove from here
}

Answer 2

Use NSURLDownload.
Sorry, that is only available on the Mac, not for iOS.
Create a temporary file, and append the received data to it in connection:didReceiveData:. In connectionDidFinishLoading:, move the file to the correct place, and in connection:didFailWithError:, remove the temporary file.

Answer 3

This should do it
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSString *documentsDirectory = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
NSString *filename = [con.originalRequest.URL lastPathComponent];
NSString *path = [documentsDirectory stringByAppendingString:filename];
NSFileManager *fileManager = [NSFileManager defaultManager];
[fileManager createFileAtPath:path contents:pdfData attributes:nil];
}