Solved

Security issues with WaitForCommEvent on a laptop?

Posted on 2014-03-12
6
303 Views
Last Modified: 2014-03-18
Have I ever mentioned that I hate computers? ( just kidding of course!) I have a simple WIN32 console program that runs minimized and waits for DSR to be asserted on a com port ( RS232 ), It uses WaitForCommEvent.  When the test instrument sets DSR, the program querys the instrument for several pieces of data and reformats the data then uses INPUT functions from WinUser.h to insert the string in the stream from the keyboard. Like magic the data is inserted into a cell on a spreadsheet...  or at least it is on a desktop. When I try to run the program on a new laptop ( Win 7 ) it opens the com port OK but never gets an event from the WaitForCommEvent function. I've tested the com port using Hyperterminal and all is well. I smell a security setting!!!  Anyone have any ideas on what setting I need to address?

Regards
RonHarsh
0
Comment
Question by:RonHarsh
  • 3
  • 2
6 Comments
 
LVL 37

Expert Comment

by:Bing CISM / CISSP
ID: 39925384
any earlier versions before W7 ever ran the program and got the results as you expected?
0
 

Author Comment

by:RonHarsh
ID: 39925715
No it hasn't been around long enough. But it does work as expected on Windows 7 on any of 4 desktops.  I ran into a similar problem with HIPS ( host intrusion prevention software ) and a wired network connection to a camera ( GigE ) where the HIPS software prevented the camera from sending data.  The com port works normally on this laptop but the detection of DSR using WaitForCommEvent hangs. Yes I have verified that the DSR line is indeed toggling..
0
 

Accepted Solution

by:
RonHarsh earned 0 total points
ID: 39925902
OK, Problem solved ( sort of! ) If I open the port with the OverLapped flag set and use the event to trigger action, it works on the new laptop.  
NOW, Can someone point me a good tutorial on the simplest way to read and write strings to a comport in Overlapped mode?

Thanks
RonHarsh
0
Save on storage to protect fatherhood memories

You're the dad who has everything. This Father's Day, make sure your family memories are protected. My Passport Ultra has automatic backup and password protection to keep your cherished photos and videos safe. With up to 3TB, you have plenty of room to hold the adventures ahead.

 
LVL 19

Expert Comment

by:regmigrant
ID: 39925978
0
 
LVL 37

Expert Comment

by:Bing CISM / CISSP
ID: 39928381
it would be good to accept your own comment as the answer and keep this question as PAQ.
0
 

Author Closing Comment

by:RonHarsh
ID: 39936365
pretty straight forward, just had to go down a road I have not traveled before... OverLapped!
0

Featured Post

New My Cloud Pro Series - organize everything!

With space to keep virtually everything, the My Cloud Pro Series offers your team the network storage to edit, save and share production files from anywhere with an internet connection. Compatible with both Mac and PC, you're able to protect your content regardless of OS.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Laptops' keyboard finger touch sensitivity adjustment 3 46
win 10 not working 12 75
2 in 1 laptop vs regular laptop 4 61
i am cortana ask me anything 5 24
Many of us in IT utilize a combination of roaming profiles and folder redirection to ensure user information carries over from one workstation to another; in my environment, it was to enable virtualization without needing a separate desktop for each…
SHARE your personal details only on a NEED to basis. Take CHARGE and SECURE your IDENTITY. How do I then PROTECT myself and stay in charge of my own Personal details (and) - MY own WAY...
Windows 8 comes with a dramatically different user interface known as Metro. Notably missing from the new interface is a Start button and Start Menu. Many users do not like it, much preferring the interface of earlier versions — Windows 7, Windows X…
With the advent of Windows 10, Microsoft is pushing a Get Windows 10 icon into the notification area (system tray) of qualifying computers. There are many reasons for wanting to remove this icon. This two-part Experts Exchange video Micro Tutorial s…

911 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now