Com port

[rsch1973]

Hi,

I would like to realise a string parse of NMEA formated strings to Com1 over RS232. I have not done it before. How can I realise it. Do I have to buy a tool or can I do it with BCB6?

Thank for help.

Regards,
Ronald

 

[Totte]

I take it that You are interrested in the COM-port thing, the parsing should be easily done.

Try

http://www.traverse.com/people/poinsett/bcbcomm.html,

it worked for me.
There are also msdn.microsoft.com/library/tecart/msdn_serial.htm
and

http://www.temporaldoorway.com/programming/cbuilder/windowsapi/openingandsettingtheserialport.htm

Totte

 

[2ffat]

There are also tools (components) that are available. Some are free (e.g., Turbo Power's Async Pro from

http://www.sourceforge.net)

and some that co$t. I've used Async Pro. Once I got it installed, it worked very well. There is a thread somewhere in this forum about installing it.

James P. Cottingham

When a man sits with a pretty girl for an hour, it seems like a minute. But let him sit on a hot stove for a minute and it's longer than any hour. That's relativity.
[tab][tab]Albert Einstein explaining his Theory of Relativity to a group of journalists.

 

[Supernat03]

I posted this recently in a different bulletin board about a similar topic. It might help.

To access the LPT or any COM port from C++ Builder, you need to use MFC functions. Use the following concept and functions:

DWORD
Errors,
dwdBytesSent,
dwdBytesRead;

COMSTAT
Status;

COMMTIMEOUTS
time_outs;

DCB
dcb;

char
chrSomeByte,
ptrSomeMultiBytePointer[400];

HANDLE PortHandle = CreateFile("LPT1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);

GetCommState(PortHandle, &dcb);
SetupComm(PortHandle, 200, 200);

dcb.xxxx = xxxx;
/* Set dcb variables such as baud rate, stop bits, etc */

SetCommState(PortHandle, &dcb);
GetCommTimeouts(PortHandle, &time_outs);

time_outs.xxxx = xxxx;
/* Set comm timeouts for receive and transmit */

SetCommTimeouts(PortHandle, &time_outs);
PurgeComm(PortHandle, PURGE_TXCLEAR | PURGE_RXCLEAR | PURGE_TXABORT | PURGE_RXABORT);
ClearCommError(PortHandle, &Errors, &Status);
ClearCommBreak(PortHandle);

/* Run a separte thread that writes to the port when it's not being read from if you need asynchronous (easy way to do it) */
WriteFile(PortHandle, &chrSomeByte, 1, &dwdBytesSent, NULL);

/* Run a separate thread that reads from the port when it's not being written to (easy way) */
ReadFile(PortHandle, ptrSomeMultiBytePointer, 200, &dwdBytesRead, NULL);

CloseHandle(PortHandle);

This should work. Check out the Microsoft help file included with Borland for further info. Good luck.

Chris