fix: 修复 GiDrawUtility 失败路径内存泄漏（L3-L6）

- L3: DrawLoft(曲线版) createRegion 失败时清理三个 clone 及已成功的 region
- L4: DrawBox/DrawSphere 创建失败时释放 pSolid
- L5: DrawMesh loft 失败时释放 pSection 数组与 vecPLs 中各 polyline
- L6: DrawPipe(曲线,半径) ARX 扫掠分支补 DELETE_PTR(pReg)，与 ZWCAD/extrude 分支对齐

SourceCode/Code2026/AecRxBase/GiDrawUtility.cpp

@@ -235,7 +235,15 @@ AECDLLIMPEXP AcDbEntity* GiDrawUtility::DrawLoft(const AcDbCurve *pTop
 	AcDbRegion *pRegT = createRegion(_pTop);
 	AcDbRegion *pRegB = createRegion(_pBottom);
 
-	if (!pRegT || !pRegB) return NULL;
+	if (!pRegT || !pRegB)
+	{
+		DELETE_PTR(pRegT);
+		DELETE_PTR(pRegB);
+		DELETE_PTR(_pTop);
+		DELETE_PTR(_pBottom);
+		DELETE_PTR(_pLine);
+		return NULL;
+	}
 
 	AcDbEntity *p = DrawLoft(pRegT, pRegB, pLine);
 
@@ -367,6 +375,11 @@ AECDLLIMPEXP AcDbEntity* GiDrawUtility::DrawMesh( const Adesk::UInt32 &rows
 	if (pEnt->createLoftedSolid(vecPLs, vecGuides, &line, op) != Acad::eOk)
 	{
 		DELETE_PTR(pEnt);
+		delete [] pSection;
+		for (size_t i = 0; i < vecPLs.length(); ++i)
+		{
+			if (vecPLs[i]) DELETE_PTR(vecPLs[i]);
+		}
 		return NULL;
 	}
 
@@ -430,7 +443,10 @@ AECDLLIMPEXP AcDbEntity* GiDrawUtility::DrawBox(const AcGePoint3d &ptPos
 	AcDb3dSolid *pSolid = new AcDb3dSolid();
 	if (!pSolid) return NULL;
 	if (Acad::eOk != pSolid->createBox(X, Y, Z))
+	{
+		DELETE_PTR(pSolid);
 		return NULL;
+	}
 
 	pSolid->transformBy(
 		RotateAndMove(AcGeVector3d::kZAxis
@@ -447,7 +463,10 @@ AECDLLIMPEXP AcDbEntity* GiDrawUtility::DrawSphere(const AcGePoint3d &ptCenter
 	AcDb3dSolid *pSolid = new AcDb3dSolid();
 	if (!pSolid) return NULL;
 	if (Acad::eOk != pSolid->createSphere(dRadius))
+	{
+		DELETE_PTR(pSolid);
 		return NULL;
+	}
 
 	pSolid->transformBy(
 		RotateAndMove(AcGeVector3d::kZAxis
@@ -827,6 +846,7 @@ AcDbEntity* GiDrawUtility::DrawPipe(const AcDbCurve *pCurve, double dR)
 			acutPrintf(_T("\n拉伸错误:%d."), es);
 			DELETE_PTR(pSolid);
 		}
+		DELETE_PTR(pReg);
 	}
 	else
 	{