Http request from C# to Objective C

Question

first of all I am sorry for this kind of questions, I am a little confused with Objective C, the function I am trying to write is to upload image to a server using web service, I have already dine it using C# but it I cann't figuir out what is the problem in my objective-C code

the C# code is:

using(var wb=new WebClient){
var Data=new NameValueCollection();
data["image"]=base64(fileName)/*base64 is a function to convert the image with"file name" to base64 string*/
Uri myUri=new Uri("http://localHost:8080/test2/sss/users/1/uploadImage");
var respose=wb.UploadValues(myUri,"Post",Data)
}

the Objective-C code I am trying to use:

NSData* data = UIImageJPEGRepresentation(theImageView.image, 1.0f);
    [Base64 initialize];
    NSString *strEncoded = [Base64 encode:data];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setHTTPMethod:@"POST"];
    [request setURL:[NSURL URLWithString:@"http://localHost:8080/test2/sss/users/1/uploadImage"]];
   NSData* image=   [strEncoded dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES ];
    NSLog(@"%@",strEncoded);
    [request setHTTPBody:image];
     (void)[NSURLConnection connectionWithRequest:request delegate:self];

sorry again but the problem is that I don't Know if I am matching the parameters right

You can always use a nice third party library like AFNetworking: http://stackoverflow.com/questions/19261481/ios-image-upload-via-afnetworking-2-0 — joao, Dec 03 '13 at 10:08
I personally prefer implementing own stuff, 'cause in most cases you need maybe 10% of the provided code. `AFNetworking` is here, though :) https://github.com/AFNetworking/AFNetworking — Julian F. Weinert, Dec 03 '13 at 10:14
yes there is a reply and I can tell exactly where the problem: the server expect to find a base64 string included in the data of the url but in my case he couldn't find that string which is included in the NSData "image" in the C# case the server find it in the NameValueCollection "Data" I hope I cleared the problem enough — Ammar, Dec 03 '13 at 10:42
it won't fix your problem but [Base64 initialize]; is called automatically, you should remove it. — hooleyhoop, Dec 03 '13 at 14:59

score 1 · Answer 1 · edited May 23 '17 at 12:28

1

You don't have to base64 encode the date, but use the right content type for your request. I didn't understand your problem, but here is my working method:

- (NSURLConnection *)connectionByFormUploadingData:(NSData *)data toURL:(NSURL *)url withFileName:(NSString *)fileName forFieldName:(NSString *)fieldName delegate:(id)delegate {
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
    [request setHTTPMethod:@"POST"];

    NSString *boundary = [[NSProcessInfo processInfo] globallyUniqueString];
    [request addValue:[NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary] forHTTPHeaderField:@"Content-Type"];

    NSMutableData *postData = [[NSMutableData alloc] initWithData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [postData appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\"\r\n\r\n", fieldName, fileName ?: @"empty_file_name"] dataUsingEncoding:NSUTF8StringEncoding]];
    [postData appendData:data];
    [postData appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    [request setHTTPBody:postData];

    return [[NSURLConnection alloc] initWithRequest:request delegate:delegate startImmediately:NO];
}

EDIT

Assumed you use PHP, you save the data like this:

move_uploaded_file($_FILES['fieldName']['tmp_name'], $upload_dir.'/'.$_FILES['fieldName']['name']);

EDIT II

The last boundary in the HTTP body must be terminated using two hyphens as described in RFC1341, thanks to CouchDeveloper for this improvement!

edited May 23 '17 at 12:28

Community

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answered Dec 03 '13 at 10:09

Julian F. Weinert

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unfortunately I am not using PHP, the server was built using java and the web service is restful, i don't exactly know the mechanism of saving data in the server side but I put the C# code to clear the problem as possible – Ammar Dec 03 '13 at 10:16
1

Okay, but your problem was in Obj-C, so I think the server side would be another question. The code above is extracted from a class I wrote and I used it to build a REST client class based on it. So this code will be perfect for usage with REST APIs – Julian F. Weinert Dec 03 '13 at 10:18
thank you very much , I know that the question is not clear enough, but I tried to close it as I can, I hope your code could solve my problem I will give it a try. – Ammar Dec 03 '13 at 10:22
Yea, give it a try and keep us up to date. Actually, if the code does not work, you have an other problem, likely server side. – Julian F. Weinert Dec 03 '13 at 10:24
I think so , I give it a try but the same error happened in the server side, sorry again for talking about the C# but Compelled cause I said It worked so I am wondering if I can make a comparative with the C# code so I can achieve the same functionality – Ammar Dec 03 '13 at 10:35
Compare the code again carefully. In C# you set the data to the POST field "image", in Obj-C you just set the data to the body. You have to assign it to the key. Can you edit the Java server? – Julian F. Weinert Dec 03 '13 at 10:44
ok, if you please @julian is there a way to make the C# code as an objective-C code or convert it, I am really sorry but the time is critical for me and I need solution so I can move on – Ammar Dec 03 '13 at 10:51
@Julian The terminating delimiter must be `CRLF----`. Notice the dashes at the end. – CouchDeveloper Dec 03 '13 at 12:00
@CouchDeveloper of course you'r right! Thanks for the improvement! – Julian F. Weinert Dec 03 '13 at 14:20
And it doesn't have to be followed by `CRLF`, am I right? I didn't find that info in RFC... – Julian F. Weinert Dec 03 '13 at 14:35

score 0 · Answer 2 · answered Dec 03 '13 at 22:52

0

Try encoding your data a bit differently:

[strEncoded dataUsingEncoding:NSUTF8StringEncoding]

answered Dec 03 '13 at 22:52

Rudiger

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Http request from C# to Objective C

2 Answers2