今天要讲的文章接着上一篇讲，第三种获取SW设计结构树的方法。
这个方法的逻辑是通过先获取第一个特征，然后通过循环不断的寻找下一个特征来完成获取所有节点。
1、获取第一个特征的API如下所示：FirstFeature Method (IModelDoc2)
这个API的方法解释为：获取文档中的第一个特性。
返回值的类型为Feature。
使用的例子如下所示：
ModelDoc2 swModel = default(ModelDoc2);
ModelView swModelView = default(ModelView);
PartDoc swPart = default(PartDoc);
AssemblyDoc swAssy = default(AssemblyDoc);
FeatureManager swFeatMgr = default(FeatureManager);
Feature swFeat = default(Feature);
object[] featFace = null;
Face2 swFace = default(Face2);
object rect = null;
string featureName = null;
ArrayList featName = new ArrayList();
string nameString;
int docType = 0;
int i = 0;
int j = 0;
bool status = false;
swModel = (ModelDoc2)swApp.ActiveDoc;
swModelView = (ModelView)swModel.ActiveView;
rect = null;
swFeatMgr = (FeatureManager)swModel.FeatureManager;
swFeat = (Feature)swModel.FirstFeature();
docType = swModel.GetType();
switch (docType)
{
case (int)swDocumentTypes_e.swDocPART:
swPart = (PartDoc)swModel;
break;
case (int)swDocumentTypes_e.swDocASSEMBLY:
swAssy = (AssemblyDoc)swModel;
break;
default:
Debug.Print("Open a part or assembly document, then rerun this macro.");
break;
}
while ((swFeat != null))
{
featureName = swFeat.Name;
featName.Add(featureName);
swFeat = (Feature)swFeat.GetNextFeature();
}
2、获取下一个特征的API为：GetNextFeature Method (IFeature)
这个API的解释为：获取部件中的下一个特性。
使用的例子如下所示：
public void TraverseFeatureFeatures(Feature swFeat, long nLevel)
{
Feature swSubFeat;
Feature swSubSubFeat;
Feature swSubSubSubFeat;
string sPadStr = " ";
long i = 0;
for (i = 0; i <= nLevel; i++)
{
sPadStr = sPadStr + " ";
}
while ((swFeat != null))
{
Debug.Print(sPadStr + swFeat.Name + " [" + swFeat.GetTypeName2() + "]");
swSubFeat = (Feature)swFeat.GetFirstSubFeature();
while ((swSubFeat != null))
{
Debug.Print(sPadStr + " " + swSubFeat.Name + " [" + swSubFeat.GetTypeName() + "]");
swSubSubFeat = (Feature)swSubFeat.GetFirstSubFeature();
while ((swSubSubFeat != null))
{
Debug.Print(sPadStr + " " + swSubSubFeat.Name + " [" + swSubSubFeat.GetTypeName() + "]");
swSubSubSubFeat = (Feature)swSubSubFeat.GetFirstSubFeature();
while ((swSubSubSubFeat != null))
{
Debug.Print(sPadStr + " " + swSubSubSubFeat.Name + " [" + swSubSubSubFeat.GetTypeName() + "]");
swSubSubSubFeat = (Feature)swSubSubSubFeat.GetNextSubFeature();
}
swSubSubFeat = (Feature)swSubSubFeat.GetNextSubFeature();
}
swSubFeat = (Feature)swSubFeat.GetNextSubFeature();
}
swFeat = (Feature)swFeat.GetNextFeature();
}
}
上面的这两个例子只是说怎么用，具体这两个API的配合使用逻辑是要结合 while (feature != null)循环一起使用，才可以获取到所有的节点。
今天这篇文章就介绍这么多，我们下篇文章再见。
