Fix: MFC remote desktop touchpad two-finger scroll not working

server/2015Remote/ScreenSpyDlg.cpp

@@ -2305,8 +2305,8 @@ BOOL CScreenSpyDlg::PreTranslateMessage(MSG* pMsg)
         MSG wheelMsg = *pMsg;
         wheelMsg.lParam = MAKELPARAM(pt.x, pt.y);
         SendScaledMouseMessage(&wheelMsg, true);
+        return TRUE;  // 已处理，阻止继续分发到 OnMouseWheel
     }
-    break;
     case WM_KEYDOWN:
     case WM_KEYUP:
     case WM_SYSKEYDOWN:
@@ -2682,7 +2682,20 @@ void CScreenSpyDlg::OnLButtonUp(UINT nFlags, CPoint point)
 
 BOOL CScreenSpyDlg::OnMouseWheel(UINT nFlags, short zDelta, CPoint pt)
 {
-    return __super::OnMouseWheel(nFlags, zDelta, pt);
+    // Convert screen coordinates to client coordinates
+    ScreenToClient(&pt);
+
+    // Build MSG structure for SendScaledMouseMessage
+    MSG msg = {};
+    msg.hwnd = m_hWnd;
+    msg.message = WM_MOUSEWHEEL;
+    msg.wParam = MAKEWPARAM(nFlags, zDelta);
+    msg.lParam = MAKELPARAM(pt.x, pt.y);
+    msg.time = GetTickCount();
+    msg.pt = { pt.x, pt.y };
+
+    SendScaledMouseMessage(&msg, true);
+    return TRUE;  // Message handled, don't pass to parent
 }