$PBExportHeader$uo_pbcomm.sru
$PBExportComments$串口访问对象
forward
global type uo_pbcomm from nonvisualobject
end type
type commprop from structure within uo_pbcomm
end type
type commtimeouts from structure within uo_pbcomm
end type
type dcb from structure within uo_pbcomm
end type
end forward

type commprop from structure
	integer		wPacketLength
	integer		wPacketVersion
	long		dwServiceMask
	long		dwReserved1
	long		dwMaxTxQueue
	long		dwMaxRxQueue
	long		dwMaxBaud
	long		dwProvSubType
	long		dwProvCapabilities
	long		dwSettableParams
	long		dwSettableBaud
	integer		wSettableData
	integer		wSettableStopParity
	long		dwCurrentTxQueue
	long		dwCurrentRxQueue
	long		dwProvSpec1
	long		dwProvSpec2
	character		wcProvChar[1]
end type

type commtimeouts from structure
	long		ReadIntervalTimeout
	long		ReadTotalTimeoutMultiplier
	long		ReadTotalTimeoutConstant
	long		WriteTotalTimeoutMultiplier
	long		WriteTotalTimeoutConstant
end type

type dcb from structure
	long		DCBlength
	long		RaudRate
	long		fBinary
	long		fParity
	long		fOutxCtsFlow
	long		fOutxDsrFlow
	long		fDtrControl
	long		fDsrSensitivity
	long		fTXContinueOnXoff
	long		fOutX
	long		fInX
	long		fErrorChar
	long		fNull
	long		fRtsControl
	long		fAbortOnError
	long		fDummy2
	integer		wReserved
	integer		XonLim
	integer		XoffLim
	character		ByteSize
	character		Parity
	character		StopBits
	character		XonChar
	character		XoffChar
	character		ErrorChar
	character		EofChar
	character		EvtChar
	character		wReserved1
end type

global type uo_pbcomm from nonvisualobject
event ue_thread ( )
end type
global uo_pbcomm uo_pbcomm

type prototypes
Function Boolean CloseHandle(ulong  hObject )  Library "kernel32.dll" 
FUNCTION boolean ReadFile(ulong fhand, ref string lpbuffer, ulong numbyte, ref ulong bytesread, ulong lpover) LIBRARY "kernel32.dll" alias for "ReadFile;Ansi"
FUNCTION ulong CreateFileA(ref string fname, ulong f_access,  ulong f_share, ulong f_sec, ulong f_create, ulong f_flag, ulong f_attrib) LIBRARY "kernel32.dll" alias for "CreateFileA;Ansi"
Function Boolean WriteFile(uLong handle,ref string lpbuffer,ulong numbytes, ref ulong bytesread, ulong lpOverLaped) Library "Kernel32.dll" alias for "WriteFile;Ansi"
Function Boolean GetCommProperties(ulong  hFile,ref COMMPROP  lpCommProp ) Library "Kernel32.dll" alias for "GetCommProperties;Ansi"
Function Boolean BuildCommDCBA(ref string lpDef,ref  DCB  lpDCB ) Library "Kernel32.dll" alias for "BuildCommDCBA;Ansi"
Function Boolean SetCommState(ulong  hCommDev,ref DCB  lpdcb ) Library "Kernel32.dll" alias for "SetCommState;Ansi"
Function Boolean GetCommState(ulong  hCommDev,ref DCB  lpdcb ) Library "Kernel32.dll" alias for "GetCommState;Ansi"
Function ulong GetLastError() Library "Kernel32.dll"
Function Boolean SetCommTimeouts(ulong hCommDev, ref COMMTIMEOUTS  lpctmo ) Library "Kernel32.dll" alias for "SetCommTimeouts;Ansi"
Function Boolean PurgeComm(ulong  hCommDev, ulong  fdwAction ) Library "Kernel32.dll"

end prototypes

type variables
ulong iu_file          //句柄
boolean ib_lock        //锁
window iw_parent            //父对象
uo_thread uo_thread_pbcomm   //线程对象

string input,output          //数据缓冲
boolean PortOpen         //端口打开状态
long InputLen,OutputLen //数据缓冲长度
string CommPort             //端口名称
string CommSettings       //端口参数
long CommError                       //错误代码
end variables

forward prototypes
public function boolean of_open (string ls_com, string ls_commset)
public subroutine of_close ()
public function string of_read ()
public subroutine of_setparent (window arg_parent)
end prototypes

event ue_thread();if CommError=0 and PortOpen and (not ib_lock) then
	ulong lu_bytesread, lu_numbytes
	string ls_buff
	ulong lstr_locstruct 
	ls_buff = space(4096)
	setnull(lstr_locstruct)
	lu_numbytes = 4096
	if (not readfile ( iu_file,  ls_buff, lu_numbytes, lu_bytesread,  lstr_locstruct)) then
		CommError=getlasterror ( )
	else
		input+=left(ls_buff,lu_bytesread)
		inputlen=len(input)
		if lu_bytesread > 0 then 
			iw_parent.postevent("ue_recieve")
      else
		end if 
	end if

end if
end event

public function boolean of_open (string ls_com, string ls_commset);dcb lst_dcb
PortOpen = true
//打开串口
iu_file = CreateFileA(ls_com,3221225472,0,0,3,128,0)
if (iu_file < 0) then
	if PortOpen then closehandle(iu_file)
	PortOpen=false
	goto ext
end if

//初始化DCB
if (Not BuildCommDcbA ( ls_commset, lst_dcb )) then
	if PortOpen then closehandle(iu_file)
	PortOpen=false
	goto ext
end if

//设置串口
if (Not setcommstate ( iu_file, lst_dcb )) then
	if PortOpen then closehandle(iu_file)
	PortOpen=false
	goto ext
end if

//设置超时
commtimeouts lst_to
lst_to.readintervaltimeout =  4294967295  //MAXDWORD
SetCommTimeouts(iu_file, lst_to)
CommError=0

ext: 
return PortOpen
end function

public subroutine of_close ();//uo_thread_pbcomm.ins_stopflag=1
if PortOpen then 
	closehandle(iu_file)
	PortOpen=false
end if
end subroutine

public function string of_read ();if not PortOpen then
	messagebox("错误","端口未打开",StopSign!)
	return ""
end if
string ls_input_temp
ib_lock=true	//加锁
ls_input_temp=input
input=""
inputlen=0
ib_lock=false	//解锁
return ls_input_temp

end function

public subroutine of_setparent (window arg_parent);iw_parent = arg_parent
end subroutine

on uo_pbcomm.create
call super::create
TriggerEvent( this, "constructor" )
end on

on uo_pbcomm.destroy
TriggerEvent( this, "destructor" )
call super::destroy
end on

event constructor;PortOpen=false
ib_lock=false


SharedObjectRegister("uo_thread","pbcommobject") //将uo—thread对象注册为pbcommobject
SharedObjectGet("pbcommobject",uo_thread_pbcomm) //用uo—thread引用共享对象uo_thread_pbcomm 
uo_thread_pbcomm.of_setparent(this)  
uo_thread_pbcomm.Post of_start()

end event

event destructor;of_close()
SharedObjectUnRegister("pbcommobject")
//destroy uo_thread_pbcomm

end event