ArcGlobe三维开发之十六——加载和保存3dd文件

ArcEngine提供了加载3dd文件的方法，却没有开放保存3dd文件的接口，通过查找资料，主要是采用二进制段实现了3dd文件的保存和加载，但是用这种方法保存的3dd文件其实是“伪”3dd文件，在ArcGlobe下是打不开的。下面是源代码：

private void button_Open3dd_Click (object sender,EventArgs e)
{
try
{
ClearGlobe();
OpenFileDialog open3ddDialog = new OpenFileDialog();
open3ddDialog.Title = "打开3dd文件";
open3ddDialog.Filter = "3dd文件(*.3dd)|*.3dd";

if(open3ddDialog.ShowDialog() == DialogResult.OK)
{
if(axGlobeControl1.Check3dFile(open3ddDialog.FileName))
{
axGlobeControl1.Load3dFile(open3ddDialog.FileName);

}
else
{
IObjectStream pObjectStream = new ObjectStreamClass();
IMemoryBlobStream pMemoryBlobStream = new MemoryBlobStreamClass();
pMemoryBlobStream.LoadFromFile(open3ddDialog.FileName);
IPersistStream pPersistStream = m_globeControl.Globe as IPersistStream;
pObjectStream.Stream = pMemoryBlobStream;
pPersistStream.Load(pObjectStream);

}

}
else
{
return;
}
}
catch(System.Exception ex)
{
MessageBox.Show(ex.Message);
}
}

private void button_Save3dd_Click (object sender,EventArgs e)
{

try
{
SaveFileDialog save3ddDialog = new SaveFileDialog();
save3ddDialog.Title = "保存3dd文件";
save3ddDialog.Filter = "3dd文件(*.3dd)|*.3dd";
save3ddDialog.FileName = "test.3dd";
if (save3ddDialog.ShowDialog()==DialogResult.OK)
{

IMemoryBlobStream pMemoryBlobStream = new MemoryBlobStream();
IObjectStream pObjectStream = new ObjectStream();
pObjectStream.Stream = pMemoryBlobStream;
IPersistStream pPersistStream = m_globeControl.Globe as IPersistStream;
pPersistStream.Save(pObjectStream,1);
pMemoryBlobStream.SaveToFile(save3ddDialog.FileName);
}
else
{
return;
}
}
catch (System.Exception ex)
{
MessageBox.Show(ex.Message);
}
}

还有需要注意的问题：如果在加载3dd时，当前globecontrol中有图层存在的话，会出现闪退，我在这里只是简单的把当前globe中的所有图层清空（ClearGlobe函数），也可以采用ArcGlobe的方式写一个提示对话框的方式来处理，这样就不会出现闪退了