How to determine the size (in bytes) of a file upload using NSURLConnection?

Question

I need to know the size of the file that I upload (in bytes) to my application using NSURLConnection (GET). Here is my code obtained below if that helps. I need to know how to get the file size in bytes so that I can use it to display a UIProgressView.

- (void)connection:(NSURLConnection *)theConnection didReceiveData:(NSData *)data
// A delegate method called by the NSURLConnection as data arrives.  We just 
// write the data to the file.
{
#pragma unused(theConnection)
    NSInteger       dataLength;
    const uint8_t * dataBytes;
    NSInteger       bytesWritten;
    NSInteger       bytesWrittenSoFar;

    assert(theConnection == self.connection);

    dataLength = [data length];
    dataBytes  = [data bytes];

    bytesWrittenSoFar = 0;
    do {
        bytesWritten = [self.fileStream write:&dataBytes[bytesWrittenSoFar] maxLength:dataLength - bytesWrittenSoFar];
        assert(bytesWritten != 0);
        if (bytesWritten == -1) {
            [self _stopReceiveWithStatus:@"File write error"];
            break;
        } else {
            bytesWrittenSoFar += bytesWritten;

    } while (bytesWrittenSoFar != dataLength);
}

Answer 1

[data length] returns the size of the data in bytes, which should give you the number you are looking for.

NSData -writeToFile: atomically: and -writeToFile: options: , , -.

Answer 2

, SimpleURLConnections Apple. Apple NSURLConnection "connection: didReceiveData:"

" URL."

NSData , , , NSOutputStream, fileStream, . dataLength , NSURLConnection, "connection: didReceiveData:" , . :

@property (nonatomic, assign)   long long dataWrittenForWholeConnection;
@property (nonatomic, assign)   long long dataLengthOfWholeConnection;

: didReceiveResponse: NSURLResponse expectedContentLength .

self.dataWrittenForWholeConnection = 0;
self.dataLengthOfWholeConnection = [httpResponse expectedContentLength];

: didReceiveData: :

// bytes written for current "connection:didReceiveData:" call
bytesWrittenSoFar += bytesWritten;
// cumulative data written for connection so far
self.dataWrittenForWholeConnection += bytesWritten;

// also update the progress bar
if (self.dataLengthOfWholeConnection != NSURLResponseUnknownLength) {
    self.progressView.progress =
        ((float)self.dataWrittenForWholeConnection / (float)self.dataLengthOfWholeConnection);
}

:

assert(dataWrittenForWholeConnection == dataLengthOfWholeConnection);

SimpleURLConnections , , :

connection:didReceiveResponse:
Full size of data is 8789 bytes

connection:didReceiveData:
Data has 1408 bytes
Progress bar is at: 0.160200
1408 bytes of data were written, 1408 bytes so far

connection:didReceiveData:
Data has 1408 bytes
Progress bar is at: 0.320401
1408 bytes of data were written, 2816 bytes so far

connection:didReceiveData:
Data has 1408 bytes
Progress bar is at: 0.480601
1408 bytes of data were written, 4224 bytes so far

connection:didReceiveData:
Data has 1408 bytes
Progress bar is at: 0.640801
1408 bytes of data were written, 5632 bytes so far

connection:didReceiveData:
Data has 1408 bytes
Progress bar is at: 0.801001
1408 bytes of data were written, 7040 bytes so far

connection:didReceiveData:
Data has 1749 bytes
Progress bar is at: 1.000000
1749 bytes of data were written, 8789 bytes so far

connectionDidFinishLoading:
Connection Finished. 8789/8789 bytes of data were written.

, NSOutputStream "write: maxLength:" " ", - "connection: didReceiveData:" , , do/while . do/while.

, NSFileHandle , , : didReceiveData: call, . , , writeData: .

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    // write data to file handler
    unsigned long long dataLength = [data length];

    NSLog(@"Writing %qu bytes at %qu bytes", dataLength, [self.fileHandle offsetInFile]);
    [self.fileHandle writeData:data];
    NSLog(@"Wrote %qu bytes, now at %qu bytes", dataLength, [self.fileHandle offsetInFile]);
}