How to know server reply in iPhone?
- (IBAction) uploadImage {
/*
turning the image into a NSData object
getting the image back out of the UIImageView
setting the quality to 100
*/
NSData *imageData = UIImageJPEGRepresentation(image.image, 100);
// setting up the URL to post to
NSString *urlString = @"http://uploadhere.com/photos/iphone.php";
// setting up the request object now
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:@"POST"];
/*
add some header info now
we always need a boundary when we post a file
also开发者_StackOverflow社区 we need to set the content type
You might want to generate a random boundary.. this is just the same
as my output from wireshark on a valid html post
*/
NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
[request addValue:contentType forHTTPHeaderField: @"Content-Type"];
/*
now lets create the body of the post
*/
NSMutableData *body = [NSMutableData data];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"q\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[NSData dataWithData:imageData]];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
NSLog(@"here1");
// setting the body of the post to the reqeust
[request setHTTPBody:body];
NSLog(@"here2");
// now lets make the connection to the web
NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
NSLog(@"here3");
//NSLog(returnString);
//picText = rowZero.pickerLabel.text;
NSLog(@"here4");
rowZero.path = returnString;
//NSLog(rowZero.path);
}
In the connection with web section, this is happening.
I am using this code to upload image on server. However, in this NSLog(@"%@", returnData)
is giving me the value but NSLog(@"%@", returnString)
is returning null value. I mean how would I know that my image is being uploaded on the server or not?
You should make use of the returningResponse
and error
to validate that the request was successful.
...
NSURLResponse *response = nil;
NSError *error = nil;
NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
if (error != nil) {
// Handle error. Response code can be retrieved from NSURLResponse
}
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