failed to open stream

[zhq]

Hi,

I got the following error message. I don't know what cause this problem. Please help. Thanks a lot in advance.

zhq

***
Warning:  file_get_contents(http://localhost/uploadfiles/Process.pdf) [function.file-get-contents]: failed to open stream: HTTP request failed! HTTP/1.1 400 Bad Request
in c:\inetpub\wwwroot\vlsi\forward.php on line 18

Warning:  fopen(http://zhenghq/uploadfiles/Process.pdf) [function.fopen]: failed to open stream: HTTP request failed! HTTP/1.1 400 Bad Request
in c:\inetpub\wwwroot\forward.php on line 66

Warning:  fread(): supplied argument is not a valid stream resource in c:\inetpub\wwwroot\forward.php on line 26

Warning:  fclose(): supplied argument is not a valid stream resource in c:\inetpub\wwwroot\forward.php on line 68
***

the code is here:
***
<?php
include("download_header.php");
header("Cache-control: no-cache");

$filedir = "http://" . $HTTP_SERVER_VARS['HTTP_HOST'] . "/";

$tempdir = $filedir . "temp/";
$filedir = $filedir . "uploadfiles/";


$redirect = "http://" . $HTTP_SERVER_VARS['HTTP_HOST'] . "/";

$redirect = $redirect . "download_main.php";

function RemoteFileSize($remote_file)
{
echo "<pre>"; var_dump($remote_file); 
$file = file_get_contents($remote_file);
 
  return strlen($file);
}

function Longfread($handle, $size){
$contents = "";
do {
  $data = fread($handle, $size);
  if (strlen($data) == 0) {
  break;
  }
  $contents .= $data;
} while(true);
return $contents;
}



if (isset($_GET['page'])){
$page=$_GET['page'];

mysql_connect("localhost","root","") or die ("Unable to connect to MySQL server.");
$db = mysql_select_db("nus") or die ("Unable to select requested database.");
$sql = "SELECT f_name from file WHERE f_ID=\"$page\"";
$result = mysql_query($sql);

if($result){
if (mysql_num_rows($result) == 0){
echo "This file may not exist in database. Please enter your administrator name

correctly.
<a href=$redirect>BACK</a>.<br>";
exit();
} else{
$row_array = mysql_fetch_row($result);
$filename = $row_array[0];
//$filename ="logout.pdf";
//$tempdir=$tempdir.$filename;
echo"<pre>"; var_dump($filename);

$filedir=$filedir.$filename;
echo"<pre>"; var_dump($filedir);
$filesize=RemoteFileSize($filedir);

//header("Content-Type: application/pdf");
//header("Content-Length: ".$filesize);
//header("Content-Disposition: inline; filename=$filename");


$fp = fopen($filedir, 'rb');
$pdf_buffer = Longfread($fp, 8192);
fclose ($fp);
print $pdf_buffer;
exit();

//header("Location: $filedir");
//exit();

}
}

}else{
header("Location: $redirect");
}