前段时间发现项目中的上传FTP软件有可能会在从服务器申请断连时Crash， 所以加了一个Timer。
由于项目代码行数过大， 此处上传部分代码片段。
???timeoutTimer = new QTimer(); ???connect(timeoutTimer, SIGNAL(timeout()), this, SLOT(doTimeout())); ???timeoutTimer->setInterval(4000);
???case QFtp::Closing: ???????// The connection is closing down, but it is not yet closed. (The state will be Unconnected when the connection is closed.) ???????pMain->debug( "Status(%d) = disconnecting from HOST", type ); ???????timeoutTimer->start(); ???????break;
???case QFtp::Unconnected: ???????// There is no connection to the host. ???????pMain->debug( "Status(%d) = disconnected status", type ); ???????if ( communicator->isPerforming() ) { ???????????communicator->abortRequest(); ??// abort performing command, maybe done(ERROR) should be called later ???????} ???????timeoutTimer->stop(); //stop timer ???????break;/** ?*@projectName ??BoeB9Project ??*@author ???????Hasan ?**/ void FtpHelper::doTimeout(){ ???pMain->debug("debug154545 timeout !!!!!!!"); ???pMain->sendProxyMessage("MesUPLOADTimeout", ProxyMessage::Notify); ???timeoutTimer->stop();}在此进程发出MesUPLOADTimeout 信息之后， 项目主进程会从代理Proxy中接受此信息并进行处理。
/** *@projectName ??BoeB9Project *@author ???????Hasan **/void BoeB9QtmCellInlineMain::restartUploader(){ ???QProcess proc; ???QString c = "taskkill /im uploader.exe /f"; ???proc.execute(c); ???proc.close(); ???info("********info terminate uploader"); ???QProcess *proc1 = new QProcess(this); ???proc1->start("cmd.exe", QStringList() <<"/c" << "c:///ORBKwsmcu/bin/start_uploader.bat"); ???delete proc1; ???info("********info start uploader again");}主进程重启上传软件，从而跳过断连。
QT 防止FTP 上传软件在断连处 Crash
原文地址：https://www.cnblogs.com/hasan/p/9161750.html