serial.cpp

一个简单的Windows Serial通讯的范例 可接收GPS讯号并解析

// Serial.cpp : Defines the entry point for the DLL application.
//

#include "stdafx.h"
#include "Serial.h"




//GPS call back array
extern FireEvent (GPSCallBack)[MAX_HANDLER];
//serial definition
HANDLE hPort=INVALID_HANDLE_VALUE;;
BOOL bFinish=false;
OVERLAPPED o;
DWORD dwEvtMask;
HANDLE hThread=NULL;
voidfun (SerialCallBack)[MAX_HANDLER];


//Buffer to store GPS and GSM data
char chBuffer[100];
char *chPtr;
int chBufferSize=0;
bool bStringFinish=true;
bool bStopCollectingData=false;
bool bOnCollectingData=false;

//functions forward declaration
DWORD WINAPI ReadThread(PVOID arg);


void OnFinishProgram()
{
	bFinish=true;
	//WaitForSingleObject(hThread,INFINITE);//wait 2 secs to close ReadThread loop
	TerminateThread(hThread,0);
	if (hThread!=NULL) 
	{
		CloseHandle(hThread);
		MessageBox(NULL,L"Close Thread OK",L"Thread status",MB_OK);
	}
	bFinish=false;
	if (hPort!=INVALID_HANDLE_VALUE)
	{
		//MessageBox(NULL,L"Close Success",L"Serial Status",MB_OK);
		CloseHandle(hPort);
	}
}

BOOL APIENTRY DllMain( HANDLE hModule, 
                       DWORD  ul_reason_for_call, 
                       LPVOID lpReserved
					 )
{
    switch (ul_reason_for_call)
	{
		case DLL_PROCESS_ATTACH:
			break;
		case DLL_THREAD_ATTACH:
			break;
		case DLL_THREAD_DETACH:
			break;
		case DLL_PROCESS_DETACH:
			OnFinishProgram();
			break;
    }
    return TRUE;
}


// This is an example of an exported variable
SERIAL_API int nSerial=0;

// This is an example of an exported function.
SERIAL_API int fnSerial(void)
{
	return 42;
}

// This is the constructor of a class that has been exported.
// see Serial.h for the class definition
//CSerial::CSerial()
//{ 
//	return; 
//}



//serial functions

SERIAL_API  void SerialRead()
{
	// TODO: Add your control notification handler code here
	
	DWORD dwThreadID=0;
		    
	if (bOnCollectingData) 
	{
		//MessageBox(NULL,L"Collecting right now",L"Read status",MB_OK);
		return;
	}
	else
	{
		hThread=::CreateThread(NULL,0,ReadThread,NULL,0,&dwThreadID);
		bOnCollectingData=true;
		if (hThread==NULL) MessageBox(NULL,L"Reading Serial Port failed",L"Read status",MB_OK);
	}
}


SERIAL_API  bool SerialOpen(char *COMName,int iBaudRate)
{
	DCB PortDCB;
	COMMTIMEOUTS CommTimeouts;
	BOOL fSuccess;
	TCHAR *tCOMName=NULL;
	
	if (bOnCollectingData)
	{
		bStopCollectingData=false;
		return true;
	}
	
	tCOMName=(TCHAR*)malloc(10*sizeof(TCHAR));
	MultiByteToWideChar(CP_UTF8,0,COMName,-1,tCOMName,10);//convert COMName to wide char
	for (int i=0;i<MAX_HANDLER;i++)
	{
		SerialCallBack[i]=NULL;//initial function callback table
		GPSCallBack[i]=NULL;//initial function GPS callback table
	}
	//MessageBox(NULL,tCOMName,L"111",MB_OK);
	hPort=CreateFile(tCOMName,GENERIC_READ|GENERIC_WRITE, 0,NULL,OPEN_EXISTING,FILE_FLAG_OVERLAPPED,NULL);
	if (hPort==INVALID_HANDLE_VALUE)
	{
		CloseHandle(hPort);
		return false;
		
	}
	else
	{
		//set comm event
		fSuccess = SetCommMask(hPort, EV_RXCHAR);
		if (!fSuccess) 
		{
			return false;
		}
		o.hEvent = CreateEvent(
        NULL,   // default security attributes 
        FALSE,  // auto reset event 
        FALSE,  // not signaled 
        NULL    // no name
		);
   		// Intialize the rest of the OVERLAPPED structure to zero.
		o.Internal = 0;
		o.InternalHigh = 0;
		o.Offset = 0;
		o.OffsetHigh = 0;

		//get current setting
		GetCommState(hPort,&PortDCB); 
		//set dcb structure
		PortDCB.DCBlength=sizeof(PortDCB);
		PortDCB.BaudRate=iBaudRate;
		PortDCB.Parity=NOPARITY; 
		PortDCB.StopBits=ONESTOPBIT;
		PortDCB.ByteSize=8;
		SetCommState(hPort,&PortDCB); 
		//set comm timeout
		GetCommTimeouts(hPort,&CommTimeouts);
		CommTimeouts.ReadIntervalTimeout=MAXDWORD;
		CommTimeouts.ReadTotalTimeoutMultiplier=0; 
		CommTimeouts.ReadTotalTimeoutConstant=0; 
		CommTimeouts.WriteTotalTimeoutConstant=1000;
		CommTimeouts.WriteTotalTimeoutMultiplier=10;
		SetCommTimeouts(hPort,&CommTimeouts);
		SerialRead();
		return true;

	}
	if (tCOMName!=NULL)
	{
		free(tCOMName);
		tCOMName=NULL;
	}
}
SERIAL_API void SerialClose()
{
	// TODO: Add your control notification handler code here
	bStopCollectingData=true;
	
}
SERIAL_API  void RegSerialCallBack(int HookNumber,voidfun regfunc)
{
	SerialCallBack[HookNumber]=regfunc;
}

void CollectGPSBufferData(char ch)
{
	if (chBufferSize>=100)
	{
		chBufferSize=0;
		memset(chBuffer,0,100);
		chPtr=chBuffer;

	}
	if (ch=='$' && bStringFinish)
	{
		chBufferSize=0;
		memset(chBuffer,0,100);
		chPtr=chBuffer;
		memcpy(chPtr,&ch,1);
		chPtr++;
		bStringFinish=false;
		chBufferSize++;
	}
	else if (!bStringFinish && ch=='\n')
	{
		bStringFinish=true;
		memcpy(chPtr,&ch,1);
		GPSParse((unsigned char *)chBuffer);
		
		chBufferSize=0;
		
	}
	else if (!bStringFinish)
	{
		memcpy(chPtr,&ch,1);
		chPtr++;
		chBufferSize++;
	}
}

DWORD WINAPI ReadThread(PVOID arg)
{
	BOOL ReadStatus;
	char ReadByte;
	DWORD BytesRead;
	int i;

	while (!bFinish)
	{
		if (WaitCommEvent(hPort, &dwEvtMask, &o)) 
		{
			if (dwEvtMask & EV_RXCHAR) 
			{
				if (hPort!=INVALID_HANDLE_VALUE)
				{
					ReadStatus=ReadFile(hPort,&ReadByte,1,&BytesRead,NULL);
					
					if (bStopCollectingData) continue;
					CollectGPSBufferData(ReadByte);
					for (i=0;i<MAX_HANDLER;i++)
					{
						
						if (SerialCallBack[i]!=NULL)
							SerialCallBack[i](ReadByte);
					}
			
				}
			}
		}
	}
	return 0;
}