jhbbunch
Joined: 21 Feb 2006
Posts: 220
Helped: 16
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 08 Aug 2008 23:03 Re: Command Line Interface (CLI) using C |
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If you are using a console on Windows this will work:
| Code: |
#include <stdlib.h>
#include <windows.h>
HANDLE GetSerialPort(char *);
int main(void)
{
HANDLE h1, h2;
char h1_buffer[] = ("Hello from Com1:");
char h2_buffer[24];
DWORD byteswritten = 0, bytesread = 0;
char c1[] = {"COM3"};
char c2[] = {"COM4"};
h1 = GetSerialPort(c1);
h2 = GetSerialPort(c2);
WriteFile(h1, h1_buffer, 17, &byteswritten, NULL);
ReadFile(h2, h2_buffer, strlen(h1_buffer) + 1, &bytesread, NULL);
if (bytesread)
printf("%s\n", h2_buffer);
else
printf("Nothing read\n");
CloseHandle(h1);
CloseHandle(h2);
getch();
}
HANDLE GetSerialPort(char *p)
{
HANDLE hSerial;
hSerial = CreateFile(p,
GENERIC_READ | GENERIC_WRITE,
0,
0,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
0);
DCB dcbSerialParams = {0};
dcbSerialParams.DCBlength=sizeof(dcbSerialParams);
dcbSerialParams.BaudRate=CBR_19200;
dcbSerialParams.ByteSize=8;
dcbSerialParams.StopBits=ONESTOPBIT;
dcbSerialParams.Parity=NOPARITY;
SetCommState(hSerial, &dcbSerialParams);
return hSerial;
}
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I imnprovised this from : http://www.robbayer.com/files/serial-win.pdf
He also shows how to set timeouts and how to do it in an event driven manner. Obviusly this example uses polling, which should be fine.
Obviously you need to check for valid handles and valid returns from the functions.
Com3 and Com4 might seem strange but those are the virtual serial ports I was using.
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