如何使用 php 将 UWP 中的图像保存到 MYsql

Question

这是我第一次在 UWP 上开发，我无法使用 PHP 将图像添加到 Mysql 数据库中，我必须在数据库中添加它的路径。

我不能使用 sqlite 或任何其他数据库，因为我的同事已经开始使用 Mysql。 谁能帮我或举个例子 非常感谢您的帮助（我被困在这里）

所以，这是我用来从我的画廊上传所选图像的 UWP 代码

private Stream stream = new MemoryStream();
        private CancellationTokenSource cts;

    public MainPage()
    {
        this.InitializeComponent();
    }

    private async void buttonUpload_Click(object sender, RoutedEventArgs e)
    {
        FileOpenPicker open = new FileOpenPicker();
        open.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
        open.ViewMode = PickerViewMode.Thumbnail;

        // Filter to include a sample subset of file types
        open.FileTypeFilter.Clear();
        open.FileTypeFilter.Add(".bmp");
        open.FileTypeFilter.Add(".png");
        open.FileTypeFilter.Add(".jpeg");
        open.FileTypeFilter.Add(".jpg");

        // Open a stream for the selected file
        StorageFile file = await open.PickSingleFileAsync();

        // Ensure a file was selected
        if (file != null)
        {
            // Ensure the stream is disposed once the image is loaded
            using (IRandomAccessStream fileStream = await file.OpenAsync(FileAccessMode.Read))
            {
                BitmapImage bitmapImage = new BitmapImage();
                await bitmapImage.SetSourceAsync(fileStream);
                fileStream.AsStream().CopyTo(stream);
                img.Source = bitmapImage;
            }
        }
    }

    private async void submit_Click(object sender, RoutedEventArgs e)
    {         
        Uri uri = new Uri("http://localhost/mydatabase/add.php");
        HttpClient client = new HttpClient();
        HttpStreamContent streamContent = new HttpStreamContent(stream.AsInputStream());
        HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, uri);
        request.Content = streamContent;
        HttpResponseMessage response = await client.PostAsync(uri, streamContent).AsTask(cts.Token);

        `

这是我正在使用的 php

 <?php
 if($_SERVER['REQUEST_METHOD']=='POST'){
  $UserName = $_POST['UserName'];
 $UserImage = $_POST['UserImage'];
 require_once('conn.php');
 $sql ="SELECT  UserId FROM user";
 $res = mysqli_query($connect,$sql);
 $UserId =0 ;
 while($row = mysqli_fetch_array($res)){     
 $UserId = $row['UserId'];
 $UserId = $UserId+1;
 }
 $path = "UserImage/$UserId.png";
 $actualpath = "http://localhost/mydatabase/$path";
 $sql = "INSERT INTO user (UserId,UserName,UserImage) VALUES ('$UserId','$UserName','$actualpath')";
 if(mysqli_query($connect,$sql)){
 file_put_contents($path,base64_decode($UserImage));
 echo "Successfully Uploaded";
 } 
 mysqli_close($connect);
 }else{
 echo "Error";
 }
 ?>

我得到的只是我创建的文件夹中的空图像......显然我在从 UWP 上传图像后遇到了问题，但我不确定。

Answer 1

使用 PHP 读取文件并将其插入数据库。 请记住，图像越大，字符串越长。

$data = file_get_contents('/pics/item.png');

return $data;

这将返回数据（来自图片）