🚀 go-pugleaf

"Bob Gonder" <notbg@notmindspring.invalid> wrote in message
news:in88g21pd7ivvo44c2no7a54kl7ii2sic0@4ax.com...
> Morosh wrote:
>
> >I have two modems: one internal connected to com3, and one usb external
> >connected to com4
>
> >if(!(comport=fopen("COM3:","w+")))
> >    perror("COM3 not open.");
> >
> >COM3 not open.: No such file or directory
> >
> >(I tried both "com3" and "com3:" ), the same thing happens to com4
>
> "COM3" is correct
>
> You might try using
> HANDLE  h;
> h = CreateFile( "COM3", GENERIC_WRITE, 0, 0,
> OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0 );
> if( h != INVALID_HANDLE_VALUE )
> { DWORD byteswritten;
> WriteFile( h,"ATDT01555444333\r",
> sizeof("ATDT01555444333\r")-1, &byteswritten, 0 )
> /*  also notice the change to \r  */
> CloseHandle( h );
> }else{
> //handle the error
> };
>
>

Hello:
thanks for clarifications
But which header file should be included in the beginning?
I tried "io.h", it didn't work.
I use always the free command line compiler.
that's what I've tried:

*******************************************
#include "stdio.h"
#include "io.h"
void main()
{
HANDLE  h;
h = CreateFile( "COM3", GENERIC_WRITE, 0, 0,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0 );
if( h != INVALID_HANDLE_VALUE )
   { DWORD byteswritten;
   WriteFile( h,"ATDT01555444333\r",
   sizeof("ATDT01555444333\r")-1, &byteswritten, 0 )
   /*  also notice the change to \r  */
   CloseHandle( h );
   }else{
   //handle the error
   };
}

Thanks
Maurice