?
Solved

Reopening: Serial Port Programming

Posted on 2000-03-30
2
Medium Priority
?
379 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
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 

Accepted Solution

by:
alesp earned 400 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

Introducing Priority Question

Increase expert visibility of your issues by participating in Priority Question, our latest feature for Premium and Team Account holders. Adjust the priority of your question to get emergent issues in front of subject-matter experts for help when you need it most.

Question has a verified solution.

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

In this article we will discuss all things related to StageFright bug, the most vulnerable bug of android devices.
You should read OS supplied guidelines before developing. I can't stress that enough. The guidelines will help you understand the reasons mobile app developers do what they do.  Apple is very particular when they review appstore submissions.
In this brief tutorial Pawel from AdRem Software explains how you can quickly find out which services are running on your network, or what are the IP addresses of servers responsible for each service. Software used is freeware NetCrunch Tools (https…
In this video, Percona Solution Engineer Rick Golba discuss how (and why) you implement high availability in a database environment. To discuss how Percona Consulting can help with your design and architecture needs for your database and infrastr…
Suggested Courses
Course of the Month15 days, 10 hours left to enroll

741 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