Upload to PHP server from c sharp client application

Question

Currently i have a c sharp application (Client app). and a web application written php. I want to transfer some files whenever a particular action is performed at client side. Here is the client code to upload the file to php server..

private void button1_Click(object sender, EventArgs e)
{
    System.Net.WebClient Client = new System.Net.WebClient();

    Client.Headers.Add("Content-Type", "binary/octet-stream");

    byte[] result = Client.UploadFile("http://localhost/project1/upload.php", "POST",
                                      @"C:\test\a.jpg");

    string s = System.Text.Encoding.UTF8.GetString(result, 0, result.Length); 
}

Here is the upload.php file to move the file..

$uploads_dir = './files/'; //Directory to save the file that comes from client application.
foreach ($_FILES["pictures"]["error"] as $key => $error) {
  if ($error == UPLOAD_ERR_OK) {
     $tmp_name = $_FILES["pictures"]["tmp_name"][$key];
     $name = $_FILES["pictures"]["name"][$key];
     move_uploaded_file($tmp_name, "$uploads_dir/$name");
 }

I'm not getting any errors from above code. but it does not seem to be working. Why is it? Am i missing something?

@Baba I'm not getting any errors. But my file does not transfer. — Fawzan Izy
– Fawzan Izy, Commented Apr 19, 2012 at 23:36
repllace if ($error == UPLOAD_ERR_OK) { with if ($_FILES["file"]["error"] == UPLOAD_ERR_OK) { — Baba
– Baba, Commented Apr 20, 2012 at 7:13

Community · Accepted Answer · 2017-05-23 10:29:41Z

Your current PHP code is for handling multiple file uploads, but your C# code is only uploading one file.

You need to modify your PHP code somewhat, removing the foreach loop:

<?php
$uploads_dir = './files'; //Directory to save the file that comes from client application.
if ($_FILES["file"]["error"] == UPLOAD_ERR_OK) {
    $tmp_name = $_FILES["file"]["tmp_name"];
    $name = $_FILES["file"]["name"];
    move_uploaded_file($tmp_name, "$uploads_dir/$name");
}
?>

You also need to ensure that the ./files directory exists.

I have tested the above PHP code with your C# code and it worked perfectly.

For more information on handling file uploads, refer to the PHP documentation.
For more information on uploading multiple files with C# and PHP, here are some helpful links:

Upload files with HTTPWebrequest (multipart/form-data)

Use Arrays in HTML Form Variables

PHP: Uploading multiple files

If you want something simple for uploading multiple files, you just just upload one file at a time to upload.php in a C# loop.

grifos · Accepted Answer · 2012-04-19 23:21:05Z

0

Your php code seems right, however you try to access the file using the "picture" key of the $_FILES global. It does not seems to be specified in your csharp code. I don't know how to do it thought. You could try to see how it was named in your php by doing a print_r or vardump of you $_FILE global or using the array_keys function

Regards

Edit: I found this link that could help you to add a "name" to your uploaded file: http://www.bratched.com/en/home/dotnet/69-uploading-multiple-files-with-c.html

answered Apr 19, 2012 at 23:21

grifos

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4 Comments

Fawzan Izy Over a year ago

i have just assigned it as picture. actually what does $_FILES["pictures"]["error"] code mean?

Xenon Over a year ago

This answer is wrong. The PHP code in the question is for handling multiple file uploads, and only works when <input name="pictures[]" type="file" /> is used.

Fawzan Izy Over a year ago

Yes this is wrong. It was not meant to upload mutliple files as @Xenon said.

grifos Over a year ago

I not linked this to show you how to upload, just the quickest thing i could find to show you how to set a name for the uploaded file.Content-Disposition: form-data; name=\"{0}\"{1}{1}" was the only thing i wanted to show you. To explain $_FILE is a global array containing the uploaded file. It is a global array like the $_POST or $_GET ones. When you try to access a value in those arrays you use a key, which is called a 'name'. Like xenon example of html file input, the attribute name is set and that allow you to access the $_FILE array with the same name. Thing that i don't see in your c#.

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