個串列埠通訊的類
/**/
#ifndef _commutils_h__
#define _commutils_h__
class commutils
;#endif
/**/
#include "stdafx.h"
#include "commutils.h"
#include "stdio.h"
const int read_timeout = 500;
commutils::commutils()
commutils::~commutils()
bool commutils::opencom(int port)
char szport[10];
sprintf(szport,"com%d",port);
hcomm = createfile( szport,
generic_read|generic_write,
0,null,
open_existing,
null);
if (hcomm == invalid_handle_value) return false;
if (!setupcomm(hcomm, 1024, 512)) return false;
commtimeouts commtimeouts;
commtimeouts.readintervaltimeout = maxdword;
commtimeouts.readtotaltimeoutconstant =0;
commtimeouts.readtotaltimeoutmultiplier =0;
commtimeouts.writetotaltimeoutconstant =0;
commtimeouts.writetotaltimeoutmultiplier=0;
if (!setcommtimeouts(hcomm, &commtimeouts)) return false;
readovready.hevent = createevent(null,true,false,null);
writeovready.hevent =createevent(null,true,false,null);
security_attributes sa;
sa.nlength=sizeof(security_attributes);
sa.lpsecuritydescriptor=null;
sa.binherithandle=true;
dcb dcb;
getcommstate(hcomm, &dcb);
dcb.fbinary = true;
dcb.fparity = true;
dcb.baudrate = cbr_9600; // 波特率 9600
dcb.bytesize = 8; // 8 位資料位
dcb.parity = noparity; // 無奇偶校驗
dcb.stopbits = onestopbit; // 1 個停止位
if (!setcommstate(hcomm, &dcb )) return false;
bopencom = true;
return bopencom;
}bool commutils::writecom(unsigned char *sendchar, int sendsize)
else
switch(resd)
default:
return false;
break;}}
return true;
}void commutils::closecom()
bool commutils::readcom(unsigned char * receivedata, dword& receivelength)
if(receivelength == 0) return false;
receivedata[receivelength] = 0;
dword dwread;
dword dwres = waitforsingleobject(readovready.hevent, read_timeout);
switch(dwres)
return true;
}以下為使用方法：
// 1. 包含標頭檔案，定義變數
#include "commutils.h"
commutils thecomm;
unsigned char data[1024];
unsigned long len = 0;
// 2. 開啟串列埠，設定接收定時器
thecomm.opencom(1); // 開啟com1口
settimer(1, 50, 0);
// 3. 傳送資料
thecomm.writecom(data, len);
// 4. 接收資料處理
void cuartdlg::ontimer(uint nidevent) }}
cdialog::ontimer(nidevent);
}
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