Com port programming through c on same pc

Question

1.00/5 (1 vote)

See more:

i am searching for a sample program in which there would be code to open the com port send data to com port then show the send data on the screen of my computer and that can be able to run in visual studio 2010 and not using MFC,i want the com port communication on my PC,i mean i don't have any other PC to send data.

Posted 15-Aug-12 21:46pm

Tarun Batra

Add a Solution

Comments

Sergey Alexandrovich Kryukov 16-Aug-12 4:14am

What, broken Google? Or Bing? Both? -- oh, no! :-)
--SA

Tarun Batra 16-Aug-12 4:17am

i didn't find any code which ran successfully on VS 2010 in which we are sending and receiving data from same machine

Hawkfuture 16-Aug-12 4:44am

i remember that com ports can be open and read/writed by win32 apis. Such as CreateFile / ReadFile / WriteFile. pls see MSDN for detail.

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Answer 1 · 2012-08-15T22:13:00

Solution 1

Please see, for example: www.robbayer.com/files/serial-win.pdf[^].

If you need better help, please use some search engine.

—SA

Posted 15-Aug-12 22:13pm

Sergey Alexandrovich Kryukov

Jochen Arndt · Answer 2 · 2012-08-15T23:24:00

To receive data on the same PC you need a loopback plug on your serial port (without using hardware flow control this plug just connects the TXD line to the RXD line).

Use the Windows API function CreateFile() to open the port and WriteFile() / ReadFile() to write and read (untested example):

C++

HANDLE hCom = ::CreateFile(_T("COM1"),
    GENERIC_READ | GENERIC_WRITE,
    0,
    NULL,
    OPEN_EXISTING,
    0,
    NULL);
if (hCom != INVALID_HANDLE_VALUE)
{
    DWORD dwWritten;
    ::WriteFile(hCom, "Test", strlen("Test"), &dwWritten, NULL);
    DWORD dwRead;
    char pBuf[32];
    ::ReadFile(hCom, pBuf, sizeof(pBuf), &dwRead, NULL);
    pBuf[min(dwRead, sizeof(pBuf)-1)] = '\0';
    ::MessageBox(NULL, pBuf, _T("Received text"), MB_OK);
    ::CloseFile(hCom);
}