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<DIV id=TextTitle>
<H1>Delphi串口通訊的監(jiān)聽</H1>http://tech.163.com/school · 2005-09-07 10:20:56 · 來源:
Delphi園地</DIV>
<DIV id=TextContent>
<P></P>串口程序我后來研究了好久，寫了下面的代碼，后臺(tái)生成一個(gè)線程監(jiān)聽串口，不影響前臺(tái)工作。效果很好，一直用于GPS儀器的數(shù)據(jù)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://經(jīng)度、緯度 <BR>VID : string; file://車號(hào) <BR>begin
<BR>while Connected do begin <BR>GetMem(ComStat,SizeOf(TComStat));
<BR>ClearCommError(CommHandle, dwErrorFlags, ComStat); <BR>if (dwErrorFlags
>0) then begin <BR>PurgeComm(CommHandle,(PURGE_RXABORT and PURGE_RXCLEAR));
<BR>// return 0; <BR>end; <BR>dwLength := ComStat.cbInQue; <BR>if
(dwLength>0) then begin <BR>fReadStat := ReadFile(CommHandle, InChar,
1,dwLength, nil); <BR>if (fReadStat) then begin <BR>if (InChar <>Chr(13))
and (Length(abIn) < MAXBLOCK+5 ) then AbIn := AbIn + InChar <BR>else begin
<BR>... <BR>{接收完畢，} <BR>end;//if (fReadStat>0){ <BR>end; file://if
(dwLength>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 := '連接中...'; <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 := '連接失敗'; <BR>Exit; <BR>end;
<BR>StatusBar1.SimpleText := '已同端口 '+ ComboBox1.Text + ' 連接！';
<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 := '線程建立失敗'; <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>{終止線程}
<BR>CommThread.Terminate; <BR>StatusBar1.SimpleText := '關(guān)閉端口'+ComboBox1.Text;
<BR>end; <BR>procedure TCommForm.FormClose(Sender: TObject; var Action:
TCloseAction); <BR>begin <BR>Connected := FALSE; <BR>CloseHandle(CommHandle);
<BR>StatusBar1.SimpleText := '關(guān)閉端口'+ComboBox1.Text; <BR>end; <BR>end.
</CODE><BR></B>
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