Flutter：在 Null 上扫描“路径”

Question

我正在尝试使用 PHP API 将使用图像选择器包拍摄的图像上传到我的 localhost 服务器。 拍摄照片时，调试控制台中会出现一条消息，提示“已扫描（某些路径）为空”，并且图像路径未保存。 如果任何对此有所了解的人告诉我如何解决它，我将不胜感激。 先感谢您！

这是我的相关代码：

-(PHP Backend)inserting an image to the database:

include_once "../../api/patients/create_image.php";
if (
    isset($_POST["id"])
) {

    if (!empty($_FILES["file"]['name']) )
    {
    $image = uploadImage("file", '../images/', 200,600);
   
    $img_image = $image["image"];
    
    }
    else{
        $img_image = "";
    }
    $id = $_POST["id"];
    $insertArray = array();
    
    array_push($insertArray, htmlspecialchars(strip_tags($img_image)));
    array_push($insertArray, htmlspecialchars(strip_tags($id)));
    

    $sql = "insert into patient_images (image, file_id) values (?,?)";
    $result = dbExec($sql, $insertArray);
    
    $resJson = array("result" => "success", "code" => 200, "body" => $insertArray);
    echo json_encode($resJson, JSON_UNESCAPED_UNICODE);
} else {
    //bad request
    $resJson = array("result" => "fail", "code" => "400");
    echo json_encode($resJson, JSON_UNESCAPED_UNICODE);
}

unction uploadImage($inputName, $uploadDir  , $thumbnail_width , $image_width)
{
    $image = $_FILES[$inputName];
    //echo "error " . $image['name'] . $image['tmp_name'] . "end;"; 
    $imagePath = '';
    $thumbnailPath = '';
//  echo "before";
    // if a file is given
    if (trim($image['tmp_name']) != '') {
        $ext = substr(strrchr($image['name'], "."), 1); //$extensions[$image['type']];

        // generate a random new file name to avoid name conflict
        $imagePath = md5(rand() * time()) . ".$ext";
        
        list($width, $height, $type, $attr) = getimagesize($image['tmp_name']); 

        // make sure the image width does not exceed the
        // maximum allowed width
        
        if ($width > $image_width) {
//                  echo "after";
            $result    = createThumbnail($image['tmp_name'], $uploadDir . $imagePath, $image_width);
            $imagePath = $result;
        } else {
            $result = move_uploaded_file($image['tmp_name'], $uploadDir . $imagePath);
        }   
        
        if ($result) {
            // create thumbnail
            $thumbnailPath =  md5(rand() * time()) . ".$ext";
            $result = createThumbnail($uploadDir . $imagePath, $uploadDir . $thumbnailPath, $thumbnail_width);
            
            // create thumbnail failed, delete the image
            if (!$result) {
                unlink($uploadDir . $imagePath);
                $imagePath = $thumbnailPath = '';
            } else {
                $thumbnailPath = $result;
            }   
        } else {
            // the product cannot be upload / resized
            $imagePath = $thumbnailPath = '';
        }
        
    }

    
    return array('image' => $imagePath, 'thumbnail' => $thumbnailPath);
}

• （前端）：

   Future<bool> uploadFile(File imageFile, String id) async { var stream = http.ByteStream(DelegatingStream.typed(imageFile.openRead())); var length = await imageFile.length(); var uri = Uri.parse(path_api + 'patients/insertImage.php'); print(uri.path); var request = http.MultipartRequest('POST', uri); var multiPartFile = http.MultipartFile('file', stream, length, filename: basename(imageFile.path)); request.fields['id'] = id; request.files.add(multiPartFile); var response = await request.send(); if (response.statusCode == 200) { print('ok'); } else { print('nope'); } } Future getImageCamera() async { var image = await picker.pickImage(source: ImageSource.camera); setState( () { if (image != null) { _image = File(image.path); } else { print('no image selected'); } }, ); }