Solved

Reopening: Serial Port Programming

Posted on 2000-03-30
2
356 Views
Last Modified: 2013-12-27
For one of my application I need to access the serial port of the PPC(I have a Compaq Aero 2180 having win CE 2.11) .I tried opening the port using the CreateFile statement, but it gave me an error saying
INVALID_HANDLE_VALUE. I tried running the program on the device as well as in emulation . It failed on both. In emulation I did kill  the NT serial drivers and started the CE ones(i.e NET STOP SERIAL and then NET START WCEEMULD), but that didnt help either. I used GetLastError() and the value it returned was 2(i.e The system cannot find the file specified).the code goes something like this.
                  .....
                  .....
                  LPCTSTR comport;
                  HANDLE h;
                  comport =TEXT("COM1:");
                  // open port for I/O
                  h = CreateFile(comport,
                                       GENERIC_READ|GENERIC_WRITE,
                                       0,NULL,
                                       OPEN_EXISTING,0,NULL);
Also tried writng it as
 h = CreateFile(TEXT("COM1:"),
                                       GENERIC_READ|GENERIC_WRITE,
                                       0,NULL,
                                       OPEN_EXISTING,0,NULL);
 After this, the h is simply "INVALID_HANDLE_VALUE", which means it failed to open the port. Can anyone suggest where I am doing it  wrong. Do I need to make any changes in the registry settings? Any help will be greatly appreciated .
Thanks
0
Comment
Question by:nthota
2 Comments
 

Accepted Solution

by:
alesp earned 100 total points
ID: 2729490
Hello,

I am using serial port on Palm-sizePC Casio E-105 and I use next code for opening COM port:

....
CString comport = "COM1:";
HANDLE h;

h = CreateFile((LPCTSTR)comport,
                GENERIC_READ | GENERIC_WRITE,
                0, NULL,
                OPEN_EXISTING,
                0, NULL);

....
 I hope this will help you solve you problem.

Best regards
0
 

Author Comment

by:nthota
ID: 2731144
Thanks for the suggestion.I guess there was some problem with my device then. I used the same code that I posted  and it worked well

regrads
Neelima
0

Featured Post

Better Security Awareness With Threat Intelligence

See how one of the leading financial services organizations uses Recorded Future as part of a holistic threat intelligence program to promote security awareness and proactively and efficiently identify threats.

Join & Write a Comment

I recently asked a question (http://www.experts-exchange.com/Programming/Smartphones/Android/Q_28684946.html) about Computer Inventory applications for Mobile Devices.  I was specifically interested in an app I could use on my android phone.  The be…
As the title indicates, I have done this before. It chills me everytime I update the OS on my phone, (http://www.experts-exchange.com/articles/18084/Upgrading-to-Android-5-0-Lollipop.html) because one time I did this and I essentially had a bricked …
Sending a Secure fax is easy with eFax Corporate (http://www.enterprise.efax.com). First, Just open a new email message.  In the To field, type your recipient's fax number @efaxsend.com. You can even send a secure international fax — just include t…
This video demonstrates how to create an example email signature rule for a department in a company using CodeTwo Exchange Rules. The signature will be inserted beneath users' latest emails in conversations and will be displayed in users' Sent Items…

760 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

18 Experts available now in Live!

Get 1:1 Help Now