?
Solved

Serial Port Programming

Posted on 2000-03-29
3
Medium Priority
?
334 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.
.....
.....
TCHAR comport;
HANDLE h;
comport =TEXT("COM1:");
// open port for I/O
h = CreateFile(comport,
                     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
3 Comments
 

Accepted Solution

by:
CharlesDHManning earned 30 total points
ID: 2667343
I think you want
TCHAR *comport instead of TCHAR comport.
0
 

Author Comment

by:nthota
ID: 2669575
There is a little correction I need to make in the code I posted, I defined comport as LPCSTR and not TCHAR. that is the reason I wrote it as
 comport = TEXT("COM1:")
I redefined it as TCHAR *comport, but  that didnt work either. I also tried writing it directly as
h = CreateFile(TEXT("COM1:")                                      GENERIC_READ|GENERIC_WRITE,
                                       0,NULL,
                                       OPEN_EXISTING,0,NULL);
but of no use. Do you have any other suggestions?
Thanks
Neelima
0
 

Author Comment

by:nthota
ID: 2669603
There is a little correction I need to make in the code I posted, I defined comport as LPCTSTR and not TCHAR. that is the reason I wrote it as
 comport = TEXT("COM1:") I redefined it as TCHAR *comport, but  that didnt work either. I also tried writing it directly as
h = CreateFile(TEXT("COM1:"),GENERIC_READ|GENERIC_WRITE, 0,NULL,  OPEN_EXISTING,0,NULL);
but of no use. Do you have any other suggestions?
 Thanks
 Neelima
0

Featured Post

Upgrade your Question Security!

Add Premium security features to your question to ensure its privacy or anonymity. Learn more about your ability to control Question Security today.

Question has a verified solution.

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

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…
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.
Despite its rising prevalence in the business world, "the cloud" is still misunderstood. Some companies still believe common misconceptions about lack of security in cloud solutions and many misuses of cloud storage options still occur every day. …
When cloud platforms entered the scene, users and companies jumped on board to take advantage of the many benefits, like the ability to work and connect with company information from various locations. What many didn't foresee was the increased risk…
Suggested Courses
Course of the Month17 days, 10 hours left to enroll

830 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