c++ sending ascii 254 through serial communication -

i'm using serial.cpp code arduino's website.

what i'm doing right using r220hprs relay switch. problem sample codes in vb , i'm using c++. so, read through manual , found sending ascii 254 , ascii 1 turn relay 1 switch on

vb example

  mscomm1.output = chr$(254) 'enter command mode    mscomm1.output = chr$(1) 'turn on relay 1  

then found serial.cpp arduino's website , decided try using it. , when did, got connect device (or said did when ran program), don't know how send ascii 254 , ascii 1

here's code serial.cpp

bool serial::writedata(char *buffer, unsigned int nbchar) {     dword bytessend;      //try write buffer on serial port     if(!writefile(this->hserial, (void *)buffer, nbchar, &bytessend, 0))     {         //in case don't work comm error , return false         clearcommerror(this->hserial, &this->errors, &this->status);          return false;     }     else         return true; } 

main

 int _tmain(int argc, _tchar* argv[]) {     printf("welcome serial test app!\n\n");  serial* sp = new serial("\\\\.\\com3");    // adjust needed  if (sp->isconnected())     printf("we're connected");  while(sp->isconnected()) {     char *chr0 = "254";     sp->writedata(chr0, 1);      sp->writedata(chr0, 1);     sleep(500); } return 0; } 

i know chr0 = "254" not ascii, don't have idea how send ascii 254 , ascii 1.

to send single char value 245, need make char:

char chr0 = 254;   sp->writedata(&chr0, 1);