寻找特定串口C++

#include "Setupapi.h"
#include "DEVGUID.H"
#pragma comment(lib,"setupapi")


void CAutopressDlg::OnBTNStart() 
{
	// TODO: Add your control notification handler code here

if(m_Type.GetCheck()==FALSE && m_Btype.GetCheck()==FALSE && m_Ctype.GetCheck()==FALSE)
{
MessageBox("Please Choose Type!");
return;
}
else
 hThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE )PALY, 0, 0, (LPDWORD)&ThreadID);
m_Start.EnableWindow(FALSE);
m_Stop.EnableWindow(TRUE);
//接收com信息
HDEVINFO hDevInfo;						
SP_DEVINFO_DATA	DeviceInfoData;						
DWORD	DeviceIndex;						
//	Create	a	HDEVINFO	with	all	present	devices.
hDevInfo=SetupDiGetClassDevs((LPGUID) &GUID_DEVCLASS_PORTS,0,0,DIGCF_PRESENT);
if	(hDevInfo	==	INVALID_HANDLE_VALUE)				
{						
DWORD	ErrorCode	=	GetLastError();			
}				
DeviceInfoData.cbSize	=	sizeof(SP_DEVINFO_DATA);
for	(DeviceIndex=0;SetupDiEnumDeviceInfo(hDevInfo,DeviceIndex,&DeviceInfoData);DeviceIndex++)						
{	

DWORD	DataPropertyType;						
LPTSTR	buffer	=	NULL;				
DWORD	buffersize	=	0;
while	(!SetupDiGetDeviceRegistryProperty(						
hDevInfo,							
&DeviceInfoData,							
SPDRP_FRIENDLYNAME,							
&DataPropertyType,							
(PBYTE)buffer,							
buffersize,							
&buffersize))							
{							
	DWORD	ErrorCode=GetLastError();						
	if	(ErrorCode==						
	ERROR_INSUFFICIENT_BUFFER)							
	{							
	//	Change	the	buffer	size.			
	if	(buffer)	LocalFree(buffer);					
	buffer	=	(LPTSTR)LocalAlloc(LPTR,buffersize);					
	}							
	else							
	{							
	//	Insert	error	handling	here.			
	break;							
	}							
}	
			
CString	FriendlyPortName=buffer;	/*Extract	Serial	Port	Name*/		
int	pos=FriendlyPortName.Find('(');						
CString	SerialPortName=FriendlyPortName.Right(FriendlyPortName.GetLength()-pos-1-3);						
SerialPortName.TrimRight(')');
		if(FriendlyPortName.Left(7)=="USB-SER")//特定串口
		{							
								
		Getport=SerialPortName;
		}
		if(buffer)							
		{							
		LocalFree(buffer);							
		}							
}							
if	(GetLastError()!=NO_ERROR						
&&GetLastError()!=ERROR_NO_MORE_ITEMS	)						
{							
					
}							
//	Cleanup						
SetupDiDestroyDeviceInfoList(hDevInfo);	
						

if(Getport=="0")
{

MessageBox("No Com Port");
return;
}
	if(m_port.GetPortOpen())
	m_port.SetPortOpen(FALSE);
	//if(Getport=="0")
	//return;

	m_port.SetCommPort(atoi(Getport));
	m_port.SetInBufferSize(1024);
	m_port.SetOutBufferSize(1024);

	m_port.SetSettings("9600,n,8,1");
	m_port.SetInputMode(1);
	m_port.SetRThreshold(1);
	m_port.SetInputLen(0);

	if(!m_port.GetPortOpen())
	m_port.SetPortOpen(TRUE);	
	m_port.GetInput();

}


void CAutopressDlg::OnOnCommMscomm1() //接收
{
VARIANT variant_inp;
    COleSafeArray safearray_inp;
    LONG len,k;
    BYTE rxdata[2048]; //设置BYTE数组 An 8-bit integerthat is not signed.
    CString strtemp;
    if(m_port.GetCommEvent()==2) //事件值为2表示接收缓冲区内有字符
    {             ////////以下你可以根据自己的通信协议加入处理代码
        variant_inp=m_port.GetInput(); //读缓冲区
        safearray_inp=variant_inp; //VARIANT型变量转换为ColeSafeArray型变量
        len=safearray_inp.GetOneDimSize(); //得到有效数据长度
        for(k=0;k<len;k++)
            safearray_inp.GetElement(&k,rxdata+k);//转换为BYTE型数组
        for(k=0;k<len;k++) //将数组转换为Cstring型变量
        {
            BYTE bt=*(char*)(rxdata+k); //字符型
            strtemp.Format("%c",bt); //将字符送入临时变量strtemp存放
            //m_EditRxData+=strtemp; //加入接收编辑框对应字符串 
			if(strtemp.GetLength()>0 && atoi(strtemp)>0)
			{
			autopress=1;
			
			CString cstimes;
			cstimes.Format("%d Times",times);
			m_show.SetWindowText(cstimes);
			}
		
        }
    }
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