Uploading a File to the Image Library with a custom form

To upload a file from a form:

An Example form:

<form method="post" enctype="multipart/form-data">
  <input type="file" name="thefile"/>
  <input type="submit">
</form>

Example 1:

Code to process the form:

<?php

  // get the node to store the file under
  $images = $GLOBALS["WT"]->getNode("/File/Images");

  // store the uploaded file by giving the name of the file control

  $file = $images->createChild("wtFile", Array("Field Name" => "thefile"));
?>

Example 2:

You can also limit the types of files that can be uploaded:

<?php

  // get the node to store the file under
  $images = $GLOBALS["WT"]->getNode("/Files/Images");

  $file = $images->createChild("wtFile", Array("Field Name" => "thefile", "Allowed Extensions" => "jpg,jpeg,gif,png"));

  if(!$file) {
    print "file type not allowed";
  }

?>

Example 3:

if the file is an image, you can also resize it on upload:

<?php

  $images = $GLOBALS["WT"]->getNode("/Files/Images");

  // resize images that are over 200px wide
  $file = $images->createChild("wtFile", Array("Field Name" => "thefile", "Allowed Extensions" => "jpg,jpeg,gif,png", "Max Width" => 200));
?>