1. 临时版本：定时向屏幕中间点击，使程序获取焦点。

fmp_vip_server.cpp

@@ -4,6 +4,7 @@
 #include <QTcpSocket>
 #include <Windows.h>
 #include <QDesktopWidget>
+#include <QTimer>
 #include <QDebug>
 
 FMPVipServer *FMPVipServer::instance()
@@ -21,7 +22,8 @@ FMPVipServer::FMPVipServer() :
     connect(this, &QTcpServer::newConnection, this, &FMPVipServer::onNewConnection);
     isNeedSocketHeader = FMPVipSettings::instance()->getIsNeedSocketHeader();
 
-    _centerPoint = QPoint(qApp->desktop()->width()/2, qApp->desktop()->height()/2);
+    QRect rc = qApp->desktop()->availableGeometry();
+    _centerPoint = QPoint(rc.width()/2, rc.height()/2);
 }
 
 void FMPVipServer::Listen(quint16 port)
@@ -71,6 +73,10 @@ void FMPVipServer::onReadyRead()
         recvData = recvData.mid(sizeof(FMSOCKEHEADER));
     }
 
+    QTimer timer;
+    timer.singleShot(200, this, &FMPVipServer::onWindowShown);
+    timer.start();
+
     QByteArray rspData;
     dispatcher->doTask(recvData, rspData);
 
@@ -80,8 +86,18 @@ void FMPVipServer::onReadyRead()
     socket->close();
     socket->deleteLater();
     socket = nullptr;
+}
+
+void FMPVipServer::onWindowShown()
+{ 
+//    qDebug() << qApp->desktop()->availableGeometry() << _centerPoint;
+    //! WARNING 这是一个临时版本，以解决程序有时获取不到焦点问题。
+    SetCursorPos(_centerPoint.x(), _centerPoint.y());
+    mouse_event(MOUSEEVENTF_LEFTDOWN|MOUSEEVENTF_ABSOLUTE, _centerPoint.x(), _centerPoint.y(),0,0);
+    mouse_event(MOUSEEVENTF_LEFTUP|MOUSEEVENTF_ABSOLUTE, _centerPoint.x(), _centerPoint.y(),0,0);
 
-    //! 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);
+//
+//    qDebug() << PostMessage(NULL, WM_LBUTTONDOWN, 0, 17+34*65536);
+//    mouse_event(MOUSEEVENTF_LEFTDOWN|MOUSEEVENTF_ABSOLUTE, 10, 10, 0,0);
+//    mouse_event(MOUSEEVENTF_LEFTUP|MOUSEEVENTF_ABSOLUTE, 10, 10, 0,0);
 }

fmp_vip_server.h

@@ -23,6 +23,9 @@ public:
     void Write(const QByteArray &data);
 
     void SetPluginContext(ctkPluginContext *ctx);
+
+public slots:
+    void onWindowShown();
 //signals:
 private slots:
     void onNewConnection();