弹出颜色选择对话框，让用户选择颜色，默认选择的是当前层的颜色

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1. static int SelColor()
2. {
3. 先获得当前层的ID
4. AcDbObjectId layerId = acdbHostApplicationServices()->workingDatabase()->clayer();
5. 然后获得当前层指针
6. AcDbLayerTableRecordPointer ptLayer(layerId,AcDb::OpenMode::kForRead);
7. 获得当前层的颜色
8. AcCmColor oldColor = ptLayer->color();
9. int nCurColor = oldColor.colorIndex();//当前层的颜色
10. int nNewColor = oldColor.colorIndex();//用户选择的颜色
13. if (acedSetColorDialog(nNewColor,Adesk::kFalse,nCurColor))
14. {
17. return nNewColor;
18. }
19. else
20. {
23. return nCurColor;
24. }
25. }

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