1. 临时版本：数据传输完毕后向屏幕发送鼠标点击事件解决POS获取不到焦点问题。

fmp_vip_server.cpp

@@ -2,6 +2,8 @@
 #include "fmvipdispatcher.h"
 #include "fmp_vip_settings.h"
 #include <QTcpSocket>
+#include <Windows.h>
+#include <QDesktopWidget>
 #include <QDebug>
 
 FMPVipServer *FMPVipServer::instance()
@@ -18,6 +20,8 @@ FMPVipServer::FMPVipServer() :
     Listen(23770);
     connect(this, &QTcpServer::newConnection, this, &FMPVipServer::onNewConnection);
     isNeedSocketHeader = FMPVipSettings::instance()->getIsNeedSocketHeader();
+
+    _centerPoint = QPoint(qApp->desktop()->width()/2, qApp->desktop()->height()/2);
 }
 
 void FMPVipServer::Listen(quint16 port)
@@ -76,4 +80,8 @@ void FMPVipServer::onReadyRead()
     socket->close();
     socket->deleteLater();
     socket = nullptr;
+
+    //! WARNING 这是一个临时版本，以解决POS接收消息后获取不到焦点问题。
+    mouse_event(MOUSEEVENTF_LEFTDOWN, _centerPoint.x(), _centerPoint.y(),0,0);
+    mouse_event(MOUSEEVENTF_LEFTUP, _centerPoint.x(), _centerPoint.y(),0,0);
 }

fmp_vip_server.h

@@ -36,6 +36,8 @@ private:
     FMVipDispatcher *dispatcher;
 
     bool isNeedSocketHeader;
+
+    QPoint _centerPoint;
 };
 
 #endif // FMP_VIP_SERVER_H