新增全域性變數：
handle hcomport;
函式oninitdialog中的**。。。
bool cmycomdlg::oninitdialog()
else
/* msdn
* msdn library
* mobile and embedded development
* windows embedded
* windows embedded ce
* windows ce 5.0
* product documentation
* windows ce features
* core os services
* core os reference
* serial communications reference
* serial communications functions
* setcommmask
*///初始化通訊裝置引數
setupcomm(hcomport, 8, 8);
//初始化資訊緩衝區
purgecomm(hcomport, purge_txclear|purge_rxclear);
getcommstate(hcomport ,&dcb);
/* msdn > msdn library > mobile and embedded development
> shared windows mobile 6 and windows... > core os services
> core os reference > serial communications reference
> serial communications functions > getcommstate */
dcb.baudrate = 9600;
dcb.bytesize = 8;
dcb.stopbits = onestopbit;
dcb.fparity = false;
dcb.parity = noparity;
dcb.foutxctsflow = false;
dcb.foutxdsrflow = false;
dcb.foutx = false;
dcb.finx = false;
dcb.fdtrcontrol = dtr_control_enable;
dcb.frtscontrol = rts_control_enable;
dcb.fdsrsensitivity = false;
dcb.ferrorchar = false;
dcb.fabortonerror = false;
/*msdn > msdn library > mobile and embedded development > windows embedded
> windows embedded ce > windows ce 5.0 > product documentation
> windows ce features > core os services > core os reference
> serial communications reference > serial communications structures
> dcb
*/setcommstate(hcomport, &dcb);
/* msdn > msdn library > mobile and embedded development
> shared windows mobile 6 and windows... > core os services
> core os reference > serial communications reference
> serial communications functions > setcommstate */
getcommtimeouts(hcomport, &timeouts);
timeouts.readintervaltimeout = maxword;
timeouts.readtotaltimeoutmultiplier = 10;
timeouts.readtotaltimeoutconstant = 10;
timeouts.writetotaltimeoutmultiplier = 50;
timeouts.writetotaltimeoutconstant = 100;
/* msdn
* msdn library
* mobile and embedded development
* windows embedded
* windows embedded ce
* windows ce 5.0
* product documentation
* windows ce features
* core os services
* core os reference
* serial communications reference
* serial communications structures
* commtimeouts
*/setcommtimeouts(hcomport, &timeouts);
}return true; // return true unless you set the focus to a control
}新建乙個按鈕，id為「idc_callcenter」，caption為callcenter，雙擊，新建函式名為：oncallcenter。
**如下：
void cmycomdlg::oncallcenter()
}else
}// cstring err;
// err.format(l"writefile = %d", dwwritten);
// messagebox(err, l"error", mb_ok);
/* msdn
* msdn library
* mobile and embedded development
* windows embedded
* windows embedded ce
* windows ce 5.0
* product documentation
* windows ce features
* file systems and data store
* file systems and data store referen...
* file i/o reference
* file i/o functions
* writefile
*//*
char t = 'a';
dword bytes_written;
if (writefile(hcomport, &t, 1, &bytes_written, 0))
else*/}
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