iOS应用程序的PHP is_uploaded_file失败

I'm writing the PHP/webserver side of an image upload for an iOS app. Using an html file I can upload an image to my script just fine. I've even written a Perl LWP script to post an image with no problems.

When the iOS app uploads an image it fails when I call is_uploaded_file. Sending back the $_FILES var in the json response show us what we expect for a file upload. Also I do a file_exists on the tmp_name and that fails as well.

Is there anything else I can look at in the request to determine what is going wrong? I'd like to be able to indicate what's wrong with the post request.

Here's the block of code where it stop processing the image upload:

    //Check for valid upload
    if(!is_uploaded_file($_FILES['photo']['tmp_name'])) {
        $this->errors['upload_2'] = $photoErrorString;
        $this->errors['files'] = $_FILES;
        $this->errors['image_uploaded'] = file_exists($_FILES['photo']['tmp_name']);
        error_log("uploadPhoto: upload_2");
        return false;
    }

As far as i know you cannot upload a image or photo from iOS app directly using PHP scripts.

You have to send 64 bit encode from the iOS app to the script responsible for the file upload as a simple POST. Then that script will firstly decode your photo's string and then PHP script will create the image from the string only to upload.

Code will be something like:

$filedb = $path_to_dir.$file_name_of_the_photo;
$profile_pic = $_POST['profile_pic'];
$profile_pic= base64_decode($profile_pic);
if(($img = @imagecreatefromstring($profile_pic)) != FALSE) 
{
  if(imagepng($img,$filedb))//will create image and save it to the path from the filedb with the name in variable file_name_of_the_photo
  {
imagedestroy($img);// distroy the string of the image after successful upload
// do other updates to database if required
  }
  else //cannot create imagepng Error
  { 
//do what required
  }
}

Hope this will work.

Linked below is a really nice NSData base64 category. If you're unfamiliar with categories in Obj-C, they're basically stock objects that we know and love with some added methods (in this case, base64 encoding/decoding). This class is really simple to drop into an existing project. Enjoy.

http://cocoawithlove.com/2009/06/base64-encoding-options-on-mac-and.html