Member Avatar for ontrix

Hi there i have a big problem i am tring to send asski code out via the serial port. what my code does is look through a saved file and picks out text information then sends it to the serial port. My problem is a wierd one!! it works ok after i open up hyperterminal and write to the lcd but it will not work if i just run the code sraight from visual C++ it outputs a lot of strange charectures im stuck any help will be great my code is attached. I am running windows xp and my compiller is visual C++ cheers

//print file on screen
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define STRICT
#include <tchar.h>
#include <windows.h>

#define THREADCOUNT 4
DWORD dwtlsIndex;
VOID ErrorExit (LPTSTR);
VOID commonFunc (VOID);


//write to the port

BOOL WriteABuffer(HANDLE hComm, char * lpBuf, DWORD dwToWrite)
{
   OVERLAPPED osWrite = {0};
   DWORD dwWritten;
   BOOL fRes;

   // Create this writes OVERLAPPED structure hEvent.
   osWrite.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
   if (osWrite.hEvent == NULL)
      // Error creating overlapped event handle.
      return FALSE;



   // Issue write.
   if (!WriteFile(hComm, lpBuf, dwToWrite, &dwWritten, &osWrite))

   {
      if (GetLastError() != ERROR_IO_PENDING) { 
         // WriteFile failed, but it isn't delayed. Report error and abort.
         fRes = FALSE;
      }
      else {
         // Write is pending.
         if (!GetOverlappedResult(hComm, &osWrite, &dwWritten, TRUE))
            fRes = FALSE;
         else
            // Write operation completed successfully.
            fRes = TRUE;
		 
      }
Sleep (100);
   }
   

   else
      // WriteFile completed immediately.
      fRes = TRUE;

   CloseHandle(osWrite.hEvent);
   
   return fRes;
}




int main () {
  FILE * pFile;
  long lSize;
  char * buffer;

  pFile = fopen ( "LCD.aup" , "rb" );
  if (pFile==NULL) exit (1);

  // obtain file size.
  fseek (pFile , 0 , SEEK_END);
  lSize = ftell (pFile);
  rewind (pFile);

  // allocate memory to contain the whole file.
  buffer = (char*) malloc (lSize);
  if (buffer == NULL) exit (2);

  // copy the file into the buffer.
  fread (buffer,1,lSize,pFile);

  char *pdest = NULL;
   
   char *tmp;
   char Trackname[80];

   char *wavetrackname;

   tmp = buffer;


   memset(&Trackname[0],32,80);
   
// open the port
			char gszPort[18];

	memset(&gszPort[0], 32,18);


HANDLE hComm;

strcpy(gszPort, "COM1");
hComm = CreateFile( gszPort,  
                    GENERIC_READ | GENERIC_WRITE, 
                    0, 
                    0, 
                    OPEN_EXISTING,
					FILE_FLAG_OVERLAPPED,
					0);
if (hComm == INVALID_HANDLE_VALUE)


{

   // error opening port; abort

}


// find wavetrack name in file
   do
   {
	   pdest = strstr( tmp, "wavetrack name" );

	   if(pdest != NULL)
	   {
		   wavetrackname = pdest + 16;
		   tmp = pdest + 1;
    
// find file name up to"
			int  pos;
			pos = strcspn( wavetrackname, "\"" );
//copy track name to new string
			strncpy( Trackname, wavetrackname, pos );

			char *ttmp = &Trackname[0];
			strncpy( ttmp + pos, "\0", 1 );
			strncpy( ttmp + pos + 1, "                  ", 18); 




   WriteABuffer(hComm, ttmp, 18);



//print results on different lines

	//	printf("\n\n\n");
	//		printf(Trackname);
	//		printf("\n");

	   
	   }
   }
   while(pdest != NULL);


  // terminate
  fclose (pFile);
  free (buffer);

  int c = getchar();

  return 0;
}
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  • 22 Hours Discussion Span
  • Latest Post Latest Post by Ancient Dragon
Member Avatar for Ancient Dragon

you probably need to set the baud rate, stop bits, data bits, and parity. See MSDN about how to configure the port.

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