Upload Multiple Images to Server IOS - ios

Question

I want to know how to upload multiple images to a server using objective C.
Here is the code snippet that I am trying to use.
-(void)uploadImage:(NSMutableArray *)image andMessageBO:(MessageBO *)message
{
NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:#"%#PostImageServlet?",kPostImageUploadWebServiceURL]];
NSMutableURLRequest *postRequest = [NSMutableURLRequest requestWithURL:url];
[postRequest setHTTPMethod:#"POST"];
[postRequest setTimeoutInterval:60.0];
NSString *stringBoundary = #"0xKhTmLbOuNdArY";
NSString *contentType = [NSString stringWithFormat:#"multipart/form-data; boundary=%#",stringBoundary];
[postRequest addValue:contentType forHTTPHeaderField: #"Content-Type"];
NSData *imageData =UIImagePNGRepresentation(image);
NSMutableData *postBody = [[NSMutableData alloc] init];
[postBody appendData:[[NSString stringWithFormat:#"isFormField=true"]dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[[NSString stringWithFormat:#"--%#\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[[NSString stringWithFormat:#"%#",#"Content-Disposition: form-data; name=\"userid\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[[NSString stringWithFormat:#"%d",messageBO.messageId] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[[NSString stringWithFormat:#"\r\n--%#\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[[NSString stringWithFormat:#"Content-Disposition: form-data; name=\"profilepic\"; filename=\"%d_postImage.png\"\r\n",messageBO.messageId] dataUsingEncoding:NSUTF8StringEncoding]];
for (int i = 0; i < [image count]; i++)
{
[postBody appendData:[[NSString stringWithFormat:#"Content-Disposition: form-data; name=\"profilepic\"; filename=\"%d_postImage%d.png\"\r\n",messageBO.messageId,i] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[image objectAtIndex:i]];
}
[postBody appendData:[[NSString stringWithFormat:#"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[postBody appendData:[NSData dataWithData:imageData]];
[postBody appendData:[[NSString stringWithFormat:#"\r\n--%#--\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
[postRequest setHTTPBody:postBody];
NSData *returnData = [NSURLConnection sendSynchronousRequest:postRequest returningResponse:nil error:nil];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
DebugLog(#"IMge:%#",returnString);
// [self removeOfflineImage:expenseBO];
}
Thanks

Answer 1

I personally using this method to communicate and upload staff to server this is a json type of approach:
- (NSURLRequest *)convertToRequest:(NSString *)stringURL withDictionary:(NSDictionary *)dictionary
{
NSError *error = nil;
NSData *JSONData = [NSJSONSerialization dataWithJSONObject:dictionary options:0 error:&error];
NSURL *url = [NSURL URLWithString:stringURL];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:#"POST"];
[request setHTTPBody: JSONData];
[request setValue:#"application/json" forHTTPHeaderField:#"Accept"];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request setValue:#"application/json" forHTTPHeaderField:#"Accept-Encoding"];
[request setValue:[NSString stringWithFormat:#"%lu", (unsigned long)[JSONData length]] forHTTPHeaderField:#"Content-Length"];
return request;
}
The dictionary parameter is filled with something like:
first convert the data to base64String something like:
NSData *data = UIImageJPEGRepresentation(self.userImageView.image, 1.0);
NSData *imageBase64Data = [data base64EncodedDataWithOptions:0];
NSString *imageBase64String = [[NSString alloc] initWithData:imageBase64Data encoding: NSUTF8StringEncoding];
add this to dictionary...
NSDictionary *jsonDictionary = #{
#0 : #{
"name": "file1",
"image" : imageBase64String1
},
#1 : #{
"name": "file2",
"image" : imageBase64String2
} //and so on..
};
//you may want to put that in a loop
[ImplementationClass convertToRequest:YourServerURL withDictionary: jsonDictionary];
and at the server side something like:
decodes the data sent to server (PHP):
// Retrieves data
$handle = fopen('php://input','r');
$jsonInput = fgets($handle);
$json_decoded = json_decode($jsonInput,true);
/*
* I commented this because i'm not sure if this suits my `NSDictionary` above
* but you can always check by logging `$json_decoded` or probably `var_dump()` function of php
*
* $json_decoded[0]['name'];
* $json_decoded[0]['image'];
* $json_decoded[1]['name'];
* $json_decoded[1]['image'];
*/
function upload_image($filename, $uploadedfile) {
$save_file_path = getcwd()."/uploads/";
$save_file_path .= $filename;
$image_file = base64_decode($uploadedfile);
//DELETES EXISTING
if (file_exists($save_file_path)) { unlink($save_file_path); }
//CREATE NEW FILE
file_put_contents($save_file_path, $image_file);
//CHECK FILE IF EXIST
return ((file_exists($save_file_path)) ? true : false );
}
hope this is helpful for you.. cheers..