c++ serial port

[susuke]

Hello!

I have connected a n6310 to the COM2 through the phone's serial cable and write this code in C++:

-----
...
void* hPort;

hPort=CreateFile("COM2:",GENERIC_READ|GENERIC_WRITE,0, NULL,OPEN_EXISTING,0,NULL);

AnsiString Message;
DWORD dwNumBytesWritten;
Message="atdt+36702636366\n";
WriteFile(hPort,&Message,18,&dwNumBytesWritten,NULL);
CloseHandle(hPort);
----

but it doesn't work. The CreateFile and WriteFile functions return with 0 error code. The AT command on the Message variable is correct, because it works in HyperTerminal.
Can anybody tell what the problem is?

thanx

 

[mrscary]

Are you setting up the port speeds and handshaking correctly?

Hollingside Technologies, Making Technology work for you.

http://www.hollingside.com

 

[susuke]

In the source code i did not set the serial port. I use the default. Should i set? (i thouhgt if it works in hyperterminal then the port settings are correct and the c++ use the windows settings...)

If i'm wrong then please write what should i set.

thanx

 

[mrscary]

I am only guessing here - so I could be wrong, but I think that hyperterminal has default baud rates and hand shaking - and there isn't a default windows setting for this.
I am guessing that your phone probably speaks at 9600 baud - have a look in the phone specs.
Let me know how you get on.

M.

Hollingside Technologies, Making Technology work for you.

http://www.hollingside.com

 

[susuke]

i've add these settings:
----
DCB PortDCB;

PortDCB.DCBlength=sizeof(DCB);
GetCommState(hPort,&PortDCB);

PortDCB.BaudRate=9600;
PortDCB.ByteSize =8;
PortDCB.Parity =NOPARITY;
PortDCB.StopBits =ONESTOPBIT;
SetCommState(hPort,&PortDCB);
----
but it still doesn't work. I know there are more settings (fBinary, fParity...) but i don't know what should i set for these...

I've never programmed serial port and i'm a beginner in c++ too. So, can you tell me what does hand-shaking mean?

 

[mrscary]

By handshaking I mean, establishing comms with the device - ensuring the baud rates etc are correct, and initiating the communications.
For instance, with a modem you might type AT - which stands for attention - then you go DT to get a dialing tone etc.

Your C++ seems to be up to the job - however the info you need seems to be specfic to your phone.

M.

Hollingside Technologies, Making Technology work for you.

http://www.hollingside.com

 

[bcravens]

I have not used the CreateFile command in awhile, however, I thought that the first parameter is simply "COM1" and not "COM1:".

try this for your CreateFile line

hPort=CreateFile(
"COM",
GENERIC_READ|GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL);


Hope this works.

 

[susuke]

Thanx for the help, but i found a component for com port (ComPort Library v2.64). I think it's more useful. But i couldn't use this for comuunication too, because the message was wrong, because the message has to be closed with \r\n not only \n.

Thanx.