How to send multiple files with post request? (obj

I want to sent post request, but i need to send multiple files, how to do this?

tnx

回答1:

Use one of the many resources on how to configure an NSMutableURLRequest for POSTing data. The Content-Type header should be "multipart/form-data", and each file will be concatenated in turn with an appropriate part header. RFC2388 is the relevant standard.

回答2:

You have to create boundaries for different images to be uploaded. Let me explain step by step. 1. Convert your images to NSData and add them to dictionary.

    UIImage *image1 = [UIImage imageNamed:@"imageName"];        
    UIImage *image2 = [UIImage imageNamed:@"imageName"];       
    UIImage *image3 = [UIImage imageNamed:@"imageName"];

    NSMutableDictionary *imageDataDictionary = [[NSMutableDictionary alloc] init];
    [imageDataDictionary setObject:UIImagePNGRepresentation(image1) forKey:@"image"];
    [imageDataDictionary setObject:UIImagePNGRepresentation(image2) forKey:@"image"];
    [imageDataDictionary setObject:UIImagePNGRepresentation(image3) forKey:@"image"];

When you have created the above dictionary its time to create body part for the request.

NSMUtableData *finalPostData = [[NSMutableData alloc] init];
NSString *boundary = @"0xKhTmLbOuNdArY";
NSString *endBoundary = [NSString stringWithFormat:@"\r\n--%@\r\n", boundary];
[finalPostData appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];    
contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];

for(NSString *key in imageDataDictionary)
{
   imageData = [imageDataDictionary objectForKey:key];
   [finalPostData appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
   [finalPostData appendData:[@"Content-Disposition: form-data; name=\"upload\"; filename=\"image.png\"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
   [finalPostData appendData:[@"Content-Type: image/png\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
   [finalPostData appendData:[NSData dataWithData:imageData]];
   [finalPostData appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
}

When all the images are added. We have to end with final boundary.

[finalPostData appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

Now our data is ready. We just have to append this to the body of the request.