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Detecting modem installation

Posted on 1998-09-07
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Last Modified: 2010-04-06
Hi,

how can I detect, if the modem is installed?

Thanx.
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Question by:Stern
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Edo082297 earned 50 total points
ID: 1338877
Hi Stern
   You want to intercepyt an event issued by Windows, WM_DEVICECHANGE, that will notify your program of a change in the hardware configuration. Look up Application.HookMainWindow, and use HookWndProc to receive this message. You will specifically be looking for the DBT_DEVICEARRIVAL message. If you would like me to code this for you, let me know and I will, but you may have enough information to go on.

Regards,
Edo
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by:Edo082297
ID: 1338878
Hi Stern
   I don't think I answered your question properly. To detect if a modem is installed on a machine, open each com port using CreateFile and send "AT"<CR>, and listen for an "OK" response. However, any of these ports with CD high should not be disturbed, as it may be in use (probably by the mouse).

HTH
Edo
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Author Comment

by:Stern
ID: 1338879
Sorry, it's not clear for me. Could you, maybe, give some examples?
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