Solved

Reopening: Serial Port Programming

Posted on 2000-03-30
2
368 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 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

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

This article shows how to setup the internet connectivity on Windows Mobile Emulator.   I assume that you already have Microsoft Visual Studio, Microsoft Windows Mobile SDK's and the emulator installed. The emulator is available with Visual Studi…
With Windows Embedded Handheld, called Windows Mobile, Microsoft re-designed the user interface. The Start Icon moved down to the bottom, inside the menu bar area.   If you need to hide the Start Icon and/or the SIP (soft input panel, softwar…
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an antispam), the admini…

730 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