Android Question [Solved] How I can get the date/time a web file before download it?

[asales]

I want to download a file (html/xml) but before the download, I want to check if the file is newer than the last file that I downloaded.

How can I check it?

Thanks in advance for any tip.

 

[DonManfred]

If it is your Webserver and your files then you could use a php script for example which returns the dates of files

http://snapshots.basic4android.de/imagesizes.php

<?php
header("content-type: text/plain");
$result = array();

foreach (glob('/absolute/path/to/images/*.png') as $filename) {
    $thisfile = array();

    $path_parts = pathinfo($filename);

    $thisfile["filename"] = $path_parts['basename'];
    $thisfile["ext"] = $path_parts['extension'];
    #echo $filename." - Größe: " . filesize($filename) . "\n";
    $size = getimagesize( $filename);
  $thisfile["width"] = $size[0];
  $thisfile["height"] = $size[1];
  # echo "Bildbreite: " . $size[0];
  # echo "Bildhöhe: " . $size[1];
  $result[] = $thisfile;
}
echo json_encode($result);
?>

[{"filename":"0024.png","ext":"png","width":407,"height":746},{"filename":"0025.png","ext":"png","width":338,"height":574},{"filename":"zip0029.png","ext":"png","width":238,"height":210},{"filename":"zip0030.png","ext":"png","width":512,"height":254}]

 

[asales]

Thanks @DonManfred.
I was thinking if is possible to use a library like httputils and informe the url and get the timestamp of the file.

 

[DonManfred]

I was thinking if is possible to use a library like httputils and informe the url and get the timestamp of the file.

You can use httputils for this.

BUT the server must implement a method which returns the filedate.

My php above is just an example you can easily adapt to not check the imagessizes but to check the filedate and then return it.

 

[DonManfred]

timestamp of the file

You can add

$fdate = filemtime($filename);
  $thisfile["mtime"] = $fdate;

to the php script above.

See http://snapshots.basic4android.de/imagedates.php as example

 

[asales]

I tried to use the code below, but I get the date = 01/17/1970 in all dates.

Where I am going wrong?
How to fix to display the date of the file?

Thanks for any tips to correct and improve the code.

Sub Activity_Create(FirstTime As Boolean)
    Dim job1 As HttpJob
    job1.Initialize("Job1", Me)
    'Send a GET request
    job1.Download("http://snapshots.basic4android.de/imagedates.php")
End Sub

Sub JobDone (Job As HttpJob)
    Log("JobName = " & Job.JobName & ", Success = " & Job.Success)
    If Job.Success = True Then
           Dim res As String
        res = Job.GetString
               
        Dim parser As JSONParser
        parser.Initialize(res)

        Select Job.JobName
            Case "Job1"
                   Dim ListOfAttributes As List
                Dim FileName As String
                Dim FileDate As Long
               
                ListOfAttributes = parser.NextArray 'returns a list with maps
                               
                For i = 0 To 5
                    Dim MyFiles As Map
                    MyFiles = ListOfAttributes.Get(i)
                                           
                    FileName = MyFiles.Get("filename")
                    FileDate = MyFiles.Get("mtime")
                       
                    Log(FileName & " - " & " - " & DateTime.Date(FileDate))  'date = 01/17/1970       
                Next   
        End Select
    Else
        Log("Error: " & Job.ErrorMessage)
        ToastMessageShow("Error: " & Job.ErrorMessage, True)
    End If
    Job.Release
End Sub

 

[asales]

Forget it!
I found the answer of @DonManfred in this post:
https://www.b4x.com/android/forum/threads/convert-unix-time-to-format-hhmm.39217/#post-232754

Problem solved!
Thanks.