Programmatically ascertain whether TWAIN scanner is turned on

Question

I am using TWAIN in a C++ program to control an Epson scanner, and have most things working as intended, with one exception:

When the scanner is not turned on, and a scan command is sent I get an error window from Epson Scan: "Cannot communicate with the scanner. Make sure the scanner is turned on (etc)".

Rather than rely on this I would like to check that the scanner is turned on on launch of my program. Is there a way (using TWAIN or not - perhaps a scan of connected, powered-on USB devices?) of achieving this?

score 1 · Answer 1 · edited May 23 '17 at 10:25

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I'm afraid this is not achivable with TWAIN. However, you can check with Epson and see if they provide related API to detect / control the error window in their TWAIN driver, so that you can better manage the error display.

Here is a similar discussion you can check out.

edited May 23 '17 at 10:25

Community

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answered Apr 16 '14 at 06:21

Rachel

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score 0 · Accepted Answer · answered Apr 17 '14 at 10:45

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I found this project:

EnumDevices project

on CodeForge which I was able to cannibalise for my needs. I was able to use the logic to generate a list of CStrings containing device names, then just ran through that looking for "EPSON Scanner".

answered Apr 17 '14 at 10:45

technorabble

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Programmatically ascertain whether TWAIN scanner is turned on

2 Answers2