ios - UIImage from UIImagePickerControllerSourceTypeCamera has no filename -

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i using imagepickercontroller take picture both gallery , using device camera.

my problem if image selected gallery can "filename", if instead use camera acquire image "filename" equal "(null)".

i need "filename" because uploading picture server , .php file using requires filename uploaded image.

this code using 

- (ibaction)addpicture:(id)sender {     [[[uiactionsheet alloc] initwithtitle:@"select from:"                                  delegate:self                         cancelbuttontitle:@"cancel"                    destructivebuttontitle:nil                         otherbuttontitles:@"gallery", @"camera", nil] showinview:self.view]; }  - (void)actionsheet:(uiactionsheet *)actionsheet diddismisswithbuttonindex:(nsinteger)buttonindex {     if (buttonindex == 0) {         uiimagepickercontroller *picker = [[uiimagepickercontroller alloc] init];         picker.mediatypes = [[nsarray alloc] initwithobjects: (nsstring *)kuttypeimage,  nil];         picker.delegate = self;         picker.allowsediting = yes;         picker.sourcetype = uiimagepickercontrollersourcetypephotolibrary;          [self presentviewcontroller:picker animated:yes completion:null];     }     else if (buttonindex == 1)     {         if (![uiimagepickercontroller issourcetypeavailable:uiimagepickercontrollersourcetypecamera]) {             [[[uialertview alloc] initwithtitle:@"error"                                         message:@"device has no camera."                                        delegate:nil                               cancelbuttontitle:@"ok"                               otherbuttontitles: nil] show];         }         else         {             uiimagepickercontroller *picker = [[uiimagepickercontroller alloc] init];             picker.mediatypes = [[nsarray alloc] initwithobjects: (nsstring *)kuttypeimage,  nil];             picker.delegate = self;             picker.allowsediting = yes;             picker.sourcetype = uiimagepickercontrollersourcetypecamera;              [self presentviewcontroller:picker animated:yes completion:null];         }     } }  - (void)imagepickercontroller:(uiimagepickercontroller *)picker didfinishpickingmediawithinfo:(nsdictionary *)info {     uiimage *chosenimage = [info[uiimagepickercontrollereditedimage] imagewithrenderingmode:uiimagerenderingmodealwaysoriginal];     nsurl *imageurl = [info valueforkey:uiimagepickercontrollerreferenceurl];      [_selectedimageview setimage:chosenimage];     [picker dismissviewcontrolleranimated:yes completion:null];      alassetslibraryassetforurlresultblock resultblock = ^(alasset *myasset)     {         alassetrepresentation *representation = [myasset defaultrepresentation];         nsstring * filename = [representation filename];         selectedimagename = [nsstring stringwithformat:@"%@", filename];         nslog(@"%@", selectedimagename);     };      alassetslibrary* assetslibrary = [[alassetslibrary alloc] init];     [assetslibrary assetforurl:imageurl                    resultblock:resultblock                   failureblock:nil]; }

this output get, image gallery:

img_3383.png

image camera:

(null)

anyone knows how "filename" image taken device camera?


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