CODEWITHSUNDEEP
iphoneioscocoa-touchnsurlconnection
mrugen munshi
mrugen munshi

Reputation: 3593

How to get document size before downloading that

I want to download a document which i do it by following code 

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:str] cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:500];

   [request setHTTPMethod:@"GET"]; 


NSData *returnData =[[NSURL alloc]init];
    returnData=[NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

and depending on the data downloaded i want to show progress bar , is there any way how i can do that.

Thanks in advance.

Upvotes: 0

Views: 619

Answers (3)

Nekto
Nekto

Reputation: 17877

In your delegate of NSURLConnection implement method - (void)connection:(NSURLConnection *)theConnection didReceiveResponse:(NSURLResponse *)response. In this method you can call 

long long expLength = [response expectedContentLength];

In expLength you will have expected document size.

But be caution:

Some protocol implementations report the content length as part of the response, but not all protocols guarantee to deliver that amount of data. Clients should be prepared to deal with more or less data.

Upvotes: 2

Manoj
Manoj

Reputation: 1003

You can do it in either ways using Synchronous/Asynchronous call. For Asynchronous there delegate methods are there which you need to implement in your class and for Synchronous you can call it within your method scope.

Upvotes: 0

Maulik
Maulik

Reputation: 19418

The NSURLConnection calls its delegate with

- (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;

Well, we need to look inside the NSURLResponse, to find the expectedContentLength

- (long long)expectedContentLength   

Return Value The receiver’s expected content length,
or NSURLResponseUnknownLength if the length can’t be determined.

Upvotes: 1

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