将图像从swift上传到php服务器时出错

Question

I have a problem trying to upload an image in swift to a PHP server. Everything looks good till the php processes the file. In that moment I get the error.

The relevant part of the swift code is:

func myImageUploadRequest(image: UIImage, realfilename: String)
{

    let myUrl = NSURL(string: "http://www.ignistudios.com/boda/postImage.php");

    let request = NSMutableURLRequest(URL:myUrl!);
    request.HTTPMethod = "POST";

    let param = [
        "firstName"  : "username",
        "lastName"    : "lastname",
        "userId"    : "9"
    ]

    let boundary = generateBoundaryString()

    request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")


    let imageData = UIImageJPEGRepresentation(image, 1)
    print(imageData.debugDescription)

    if(imageData==nil)  { return; }

    request.HTTPBody = createBodyWithParameters(param, filePathKey: "file", realfilename: realfilename, imageDataKey: imageData!, boundary: boundary)

    let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
        data, response, error in

        if error != nil {
            print("error=\(error)")
            return
        }

        // You can print out response object
        print("******* response = \(response)")

        // Print out reponse body
        let responseString = NSString(data: data!, encoding: NSUTF8StringEncoding)
        print("****** response data = \(responseString!)")



    }

    task.resume()

}


func createBodyWithParameters(parameters: [String: String]?, filePathKey: String?, realfilename: String?, imageDataKey: NSData, boundary: String) -> NSData {
    var body = NSMutableData();

    if parameters != nil {
        for (key, value) in parameters! {
            body.appendString("--\(boundary)\r\n")
            body.appendString("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n")
            body.appendString("\(value)\r\n")
        }
    }

    let filename = realfilename

    let mimetype = "image/jpg"

    body.appendString("--\(boundary)\r\n")
    body.appendString("Content-Disposition: form-data; name=\"\(filePathKey!)\"; filename=\"\(filename)\"\r\n")
    body.appendString("Content-Type: \(mimetype)\r\n\r\n")
    body.appendData(imageDataKey)
    body.appendString("\r\n")



    body.appendString("--\(boundary)--\r\n")

    return body
}




func generateBoundaryString() -> String {
    return "Boundary-\(NSUUID().UUIDString)"
}

And the php is

<?php
$uploaddir = '/fotos/';
$uploadfile = $uploaddir . basename($_FILES['file']['name']);
echo "<p>";
if (move_uploaded_file($_FILES['file']['tmp_name'], $uploadfile)) {
  echo "File is valid, and was successfully uploaded.\n";
} else {
  echo "Upload failed";
}
echo "</p>";
echo '<pre>';
echo 'Here is some more debugging info:';
print_r($_FILES);
print "</pre>";
?>

And last, the error I get is:

****** response data =

Upload failed

Here is some more debugging info:Array
(
    [file] => Array
        (
            [name] => Optional(\"boda20160428_135709.jpg\")
            [type] => 
            [tmp_name] => 
            [error] => 1
            [size] => 0
        )


)

Any tip would be very much appreciated.

Answer 1

It looks like Marc B has commented with the answer which is that it is a PHP file upload size issue.

However in cases like this it is worth testing each link in the chain separately. For example testing and reviewing the output of createBodyWithParameters. Create a test and run it there to check that the headers are properly formed. Especially make sure that the string encoding is correct. I'm not familiar with the appendString method on NSMutableData .

It should be possible to feed that output more directly into the server to eliminate other potential issues.

Answer 2

The correct answer is that the image is too big and you need to compress the image before uploading it, using this

 UIImageJPEGRepresentation(image,0.2)

When the image is small enough you will get your tmp name