C / C++ / MFC

FILE *fp=fopen("student.txt","wb+");

strcpy(s.name, "dilip");

const int NAME_LEN = 20;

struct student                        
{
   char name[NAME_LEN];
   long int phone;
                   
};

char myLongName [] = "this_is_a_very_long_name_largerthan_20_chars";

strncpy(s.name, myLongName, NAME_LEN);
s.name[NAME_LEN - 1] = '\0';

• Read the file content into memory.
• modify it
• Write the modified content to another file (say "output").
• delete the original file and rename the "output" file you produced with the original filename.

//  The filename, directory name, or volume label syntax is incorrect.

COMportName[0] = ' ';
     while (COMportName[0] == ' ') {
         printf("\nEnter the %s port number the PTU is attached to: ", COMportPrefix);
         scanf("%d", &COMportNum);
         printf("You selected %s%d. Is this OK? (enter 'y' or 'n'): ", COMportPrefix, COMportNum);
         tmpChar = 'f';
         while ( (tmpChar != 'y') && (tmpChar != 'n') )
               tmpChar = ((char) tolower(getchar()));
         if ( tmpChar == 'y' )
            sprintf(COMportName, "%s%d", COMportPrefix, COMportNum);
     }
     tmpChar = 'f';
     while (tmpChar != 'y') {
         printf("\nEnter the baud rate the ptu is communicate at (default: 9600): ");
         scanf("%d", &BaudRate);
         printf("You selected %d. Is this OK? (enter 'y' or 'n'): ", BaudRate);
         tmpChar = 'f';
         while ( (tmpChar != 'y') && (tmpChar != 'n') )
               tmpChar = ((char) tolower(getchar()));
     }


     /* initialize the serial port */
     set_baud_rate(BaudRate);
     COMstream = open_host_port(COMportName);

     if ( COMstream == PORT_NOT_OPENED )
         { printf("\nSerial Port setup error.\n");
           goto abnormal_exit;  }
     printf("\nSerial port %s initialized\n", COMportName);

jawadali477 wrote:

COMstream = open_host_port(COMportName);