Delphi断线重连线程
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Delphi断线重连线程
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作為tcp客戶端,使用TIdTcpClient控件,在與后臺服務(wù)的交互時,如果出現(xiàn)網(wǎng)絡(luò)異常,或者后臺服務(wù)重啟,會導(dǎo)致無法保存數(shù)據(jù)或查詢后臺數(shù)據(jù),這種情況下可以開啟斷線重連線程,自動連接上后臺服務(wù)
unit threadReconnectServer;interfaceusesClasses, SysUtils, ScktComp, windows, ComCtrls, forms, activex, StdCtrls, strutils, IdTCPClient, Global;typeTReconnectServerThread = class(TThread)privateclient: TIdTCPClient;protectedprocedure Execute; override;publicconstructor Create(IdTCPClient1: TIdTCPClient);destructor Destroy; override;end;implementationconstructor TReconnectServerThread.Create(IdTCPClient1: TIdTCPClient); begininherited Create(True);client := IdTCPClient1;FreeOnTerminate := False; end;destructor TReconnectServerThread.Destroy; begininherited destroy; end;procedure TReconnectServerThread.Execute; beginwhile not Terminated dobeginSleep(5000);tryclient.Disconnect;client.Connect;gOnlineSuccess := True;Suspend;excepton e: Exception dobegingOnlineSuccess := False;end;end;end; end;end.在主窗體create中創(chuàng)建線程對象,創(chuàng)建成功后,并不會執(zhí)行線程,在需要的時候,喚醒線程即可
// 聲明 ReconnectServerThread: TReconnectServerThread;// 在create中 // 斷線重連線程 ReconnectServerThread := TReconnectServerThread.Create(IdTCPClient1); function TfrmMain.SendMsgToServer(msg: string): Boolean;procedure ReconnectServer;begingOnlineSuccess := False;// 啟動重連線程ReconnectServerThread.Resume;end;beginResult := false;tryif gOnlineSuccess and IdTCPClient1.Connected thenbegin// 末尾加上分割符,保證數(shù)據(jù)傳輸?shù)椒?wù)器后,能正確按Json解析IdTCPClient1.IOHandler.Write(msg + '&&', IndyTextEncoding(TEncoding.UTF8));Result := true;endelsebeginReconnectServer;end;excepton e: Exception dobeginReconnectServer;end;end; end;總結(jié)
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