Fix N3ME crash in CMainFrame::OnDestroy.

Added safeguards getters for `CSliderCtrl` usages by verifying the
handle's availability before retrieving its position. This prevents
crashes related to access violation.

src/tool/N3ME/DlgBar.cpp

@@ -211,9 +211,7 @@ void CDlgBar::OnReleasedcaptureSliderLight(NMHDR * pNMHDR, LRESULT * pResult) {
         return;
     }
     if (pFrm->GetMapMng()) {
-        int   val = m_sld_Light.GetPos();
-        float lgt = (float)val / 100.0f;
-        pFrm->GetMapMng()->SetLight(lgt);
+        pFrm->GetMapMng()->SetLight(GetLight() / 100.0f);
     }
 
     *pResult = 0;

src/tool/N3ME/DlgBar.h

@@ -15,6 +15,10 @@ class CDlgBar : public CDialog {
     BOOL m_bUpdateingNow;
     CDlgBar(); // standard constructor
 
+    float GetLight() { return m_sld_Light.GetSafeHwnd() ? static_cast<float>(m_sld_Light.GetPos()) : 0.0f; }
+    int   GetTileRegion() { return m_TileRegion_Slider.GetSafeHwnd() ? m_TileRegion_Slider.GetPos() : 0; }
+    float GetFP() { return m_FP_Slider.GetSafeHwnd() ? static_cast<float>(m_FP_Slider.GetPos()) : 0.0f; }
+
     // Dialog Data
     //{{AFX_DATA(CDlgBar)
     enum {

src/tool/N3ME/MainFrm.h

@@ -57,8 +57,8 @@ class CMainFrame : public CFrameWnd {
 
     // Implementation
   public:
-    float GetFP() { return (float)m_wndDlgBar.m_FP_Slider.GetPos(); }
-    int   GetTileRegion() { return m_wndDlgBar.m_TileRegion_Slider.GetPos(); }
+    float GetFP() { return m_wndDlgBar.GetFP(); }
+    int   GetTileRegion() { return m_wndDlgBar.GetTileRegion(); }
     void  UpdateTransformInfo();
     virtual ~CMainFrame();
 #ifdef _DEBUG