Downloader

This is a very simple utility written in PLT-Scheme. The program can download a file from a given Web address repeatedly.
The input parameters of the program are:

The Web address
The output file name. The an integer number is added to the file name. For details see below. The file, if it already exists, will be overwritten without question.
An integer number. The number is increased after each download. The number is attached to the given filename before the extension. For example:
- The filename:
```
c:\temp\web_camera.jpg
```
- The number:
```
11
```
- The final output filename:
```
c:\temp\web_camera_11.jpg
```
The time delay in seconds. In general this time elapses between two downloads. However, the program works a little differently. The countdown of the time starts only after the file download has been finished. It means that if the download of a file takes some time then this time is added to the time delay.

To start the file downloading press the "Start" button. While the program is in downloading mode you cannot modify the input parameters. To modify the parameters press the "Stop" button. To quit the program press the "Quit" button.

If there is a network error, for example the Web address is not reachable, then the program gives a warning and it attempts the download again only after the time delay has elapsed. The integer number is not increased in this case.

When the program quits it writes out the current settings. The settings are stored in the "downloader.ini" file. The program will try to load the file and if it exists the user interface will be set to the saved values.

A screenshot

The graphical user interface of the program has been created with MredDesigner.

License

The program is licensed under LGPL.

Download

Source code

downloader.scm : The main file containing the program logic and user interface
sx-file.scm : A file selection dialog derived from PLT-Scheme.
sx-alert.scm : A dialog window for warning messages.