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<H1>Delphi串口通讯的监听</H1>http://tech.163.com/school · 2005-09-07 10:20:56 · 来源: 
Delphi园地</DIV>
<DIV id=TextContent>
<P></P>串口程序我后来研究了好久，写了下面的代码，后台生成一个线程监听串口，不影响前台工作。效果很好，一直用于GPS仪器的数据接收。 
<BR><BR><CODE><B>unit frmComm; <BR>interface <BR>uses <BR>Windows, Messages, 
SysUtils, Classes, Graphics, Controls, Forms, Dialogs, <BR>StdCtrls, 
ComCtrls,GeoUtils,GeoGPS; <BR>const MAXBLOCK = 160; <BR>type <BR>TComm = record 
<BR>idComDev : THandle; <BR>fConnected : Boolean; <BR>end; <BR>TCommForm = 
class(TForm) <BR>ComboBox1: TComboBox; <BR>Button1: TButton; <BR>StatusBar1: 
TStatusBar; <BR>Button2: TButton; <BR>ComboBox2: TComboBox; <BR>procedure 
Button1Click(Sender: TObject); <BR>procedure Button2Click(Sender: TObject); 
<BR>procedure FormClose(Sender: TObject; var Action: TCloseAction); <BR>private 
<BR>{ Private declarations } <BR>public <BR>{ Public declarations } <BR>end; 
<BR>TCommThread = Class(TThread) <BR>protected <BR>procedure Execute;override; 
<BR>public <BR>constructor Create; <BR>end; <BR>var <BR>CommForm: TCommForm; 
<BR>CommHandle : THandle; <BR>Connected : Boolean; <BR>CommThread : TCommThread; 
<BR>implementation <BR>{$R *.DFM} <BR>uses <BR>frmMain,frmMdiMapView; 
<BR>procedure TCommThread.Execute; <BR>var <BR>dwErrorFlags,dwLength : DWORD; 
<BR>ComStat : PComStat; <BR>fReadStat : Boolean; <BR>InChar : Char; <BR>AbIn : 
String; <BR>XX,YY : double; file://经度、纬度 <BR>VID : string; file://车号 <BR>begin 
<BR>while Connected do begin <BR>GetMem(ComStat,SizeOf(TComStat)); 
<BR>ClearCommError(CommHandle, dwErrorFlags, ComStat); <BR>if (dwErrorFlags 
&gt;0) then begin <BR>PurgeComm(CommHandle,(PURGE_RXABORT and PURGE_RXCLEAR)); 
<BR>// return 0; <BR>end; <BR>dwLength := ComStat.cbInQue; <BR>if 
(dwLength&gt;0) then begin <BR>fReadStat := ReadFile(CommHandle, InChar, 
1,dwLength, nil); <BR>if (fReadStat) then begin <BR>if (InChar &lt;&gt;Chr(13)) 
and (Length(abIn) &lt; MAXBLOCK+5 ) then AbIn := AbIn + InChar <BR>else begin 
<BR>... <BR>{接收完毕，} <BR>end;//if (fReadStat&gt;0){ <BR>end; file://if 
(dwLength&gt;0){ <BR>FreeMem(ComStat); <BR>end;{while} <BR>end; <BR>constructor 
TCommThread.Create; <BR>begin <BR>FreeOnTerminate := TRUE; <BR>inherited 
Create(FALSE); file://Createsuspended = false <BR>end; <BR>// <BR>procedure 
TCommForm.Button1Click(Sender: TObject); <BR>var <BR>CommTimeOut : 
TCOMMTIMEOUTS; <BR>DCB : TDCB; <BR>fRetVal : Boolean; <BR>begin 
<BR>StatusBar1.SimpleText := '连接中...'; <BR>CommHandle := 
CreateFile(PChar(ComboBox1.Text),GENERIC_READ,0,nil,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL 
<BR>, 0); <BR>if CommHandle = INVALID_HANDLE_VALUE then begin 
<BR>StatusBar1.SimpleText := '连接失败'; <BR>Exit; <BR>end; 
<BR>StatusBar1.SimpleText := '已同端口 '+ ComboBox1.Text + ' 连接！'; 
<BR>CommTimeOut.ReadIntervalTimeout := MAXDWORD; 
<BR>CommTimeOut.ReadTotalTimeoutMultiplier := 0; 
<BR>CommTimeOut.ReadTotalTimeoutConstant := 0; <BR>SetCommTimeouts(CommHandle, 
CommTimeOut); <BR>GetCommState(CommHandle,DCB); <BR>DCB.BaudRate := 9600; 
<BR>DCB.ByteSize := 8; <BR>DCB.Parity := NOPARITY; <BR>DCB.StopBits := 
ONESTOPBIT; <BR>fRetVal := SetCommState(CommHandle, DCB); <BR>if (fRetVal) then 
begin <BR>Connected := TRUE; <BR>try <BR>CommThread := TCommThread.Create; 
<BR>except <BR>Connected := FALSE; <BR>CloseHandle(CommHandle); <BR>fRetVal := 
FALSE; <BR>StatusBar1.SimpleText := '线程建立失败'; <BR>Exit; <BR>end; <BR>end 
<BR>else begin <BR>Connected := FALSE; <BR>CloseHandle(CommHandle); <BR>end; 
<BR>end; <BR>procedure TCommForm.Button2Click(Sender: TObject); <BR>begin 
<BR>Connected := FALSE; <BR>CloseHandle(CommHandle); <BR>{终止线程} 
<BR>CommThread.Terminate; <BR>StatusBar1.SimpleText := '关闭端口'+ComboBox1.Text; 
<BR>end; <BR>procedure TCommForm.FormClose(Sender: TObject; var Action: 
TCloseAction); <BR>begin <BR>Connected := FALSE; <BR>CloseHandle(CommHandle); 
<BR>StatusBar1.SimpleText := '关闭端口'+ComboBox1.Text; <BR>end; <BR>end. 
</CODE><BR></B>
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