Unable to download file to app directory in iPhone - iphone

Question

I am new to iPhone,
I am currently developing an iPhone app and would like to implement the ability to download file from the url. I have created the UIWebView, when i click on download link in the webview download will start and i am saving that file to a specified folder in the documents directory. but i am unable to see my downloaded file.
Here is my code snippet,
//CAPTURE USER LINK-CLICK in UIwebView.
- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType {
// Create the request.
NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:DUrl]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
// create the connection with the request and start loading the data
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if (theConnection) {
// Create the NSMutableData to hold the received data.
receivedData = [[NSMutableData data] retain];
} else {
NSLog(#"Inform the user that the connection failed.");
}
return YES;
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[receivedData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data1
{
[receivedData appendData:data1];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(#"Succeeded! Received %d bytes of data",[receivedData length]);
DirPath=[self MyApplicationDocumentDirectory];
[receivedData writeToFile:DirPath atomically:YES];
UIAlertView* Alert = [[UIAlertView alloc] initWithTitle:#"Download Complete !"
message:nil delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[Alert show];
[Alert release];
// release the connection, and the data object
[connection release];
[receivedData release];
}
Any help will be appriciated.
EDIT:
BOOL success =[[NSFileManager defaultManager] fileExistsAtPath:MyDirPath];
if (success)
{
UIAlertView* innerAlert = [[UIAlertView alloc] initWithTitle:#"Already downloaded."
message:#"Do you want to Downlaod again ?" delegate:self
cancelButtonTitle:nil
otherButtonTitles:#"Yes",#"No",nil];
[innerAlert show];
[innerAlert release];
}
where to write this condition ?

Answer 1

EDIT Check whether downloaded file already exits in doc dir before writing(saving) downloaded data like this:
NSArray *dirContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:DirPath error:nil];
BOOL fileExists = NO;
for(NSString *fileName in dirContents)
{
NSString *filePath = [DirPath stringByAppendingPathComponent:fileName];
NSData *fileData = [NSData dataWithContentsOfFile:filePath];
if([receivedData isEqualToData:fileData]) //your receivedData here
{
fileExists = YES;
}
}
if(fileExists)
{
NSLog(#"File exists");
}
else
{
NSLog(#"File does not exists");
}
U forgot provide fileName for writing data:
DirPath=[self MyApplicationDocumentDirectory];
NSString *filePath = [DirPath stringByAppendingPathComponent:#"yourFileName"];
[receivedData writeToFile:filePath atomically:YES];