WIA Scan

The following code sample needed to be rehashed a little as A.I. couldn’t quite get there with it but I eventually made it work. A simple scan command line with Windows image Acquisition API.

import argparse
import os
import sys
import win32com.client


def main():
    parser = argparse.ArgumentParser(description='Scan images from a WIA scanner.')
    parser.add_argument('--colour', action='store_true', help='scan in colour (default is black and white)')
    parser.add_argument('--output', required=True, help='output file path')
    parser.add_argument('--y', action='store_true', help='overwrite output file without warning')
    args = parser.parse_args()

    # Check if output file already exists
    if os.path.isfile(args.output):
        if args.y:
            os.remove(args.output)
        else:
            print(f"File '{args.output}' already exists. Use --y to overwrite.", file=sys.stderr)
            sys.exit(1)

    wia = win32com.client.Dispatch('WIA.CommonDialog')
    scanner = wia.ShowSelectDevice()

    img_type = 'Color' if args.color else 'Grayscale'
    item = scanner.Items(1)
    img_file = item.Transfer()
    file_path = os.path.abspath(args.output)
    img_file.SaveFile(file_path)

    print(f'Successfully saved scanned image to {file_path}')


if __name__ == '__main__':
    main()

The command line options are
–colour
–y
–output

If you omit –colour then you get greyscale
To force overwrite a jpeg file (JPG) use –y
And –output should be in quotes its the full file path you want to save