Summary of traversing the Layer Method in mapcontrol

You can use get_layers () in IMAP to traverse the current layer in mapcontrol. This method can filter or classify layers by specifying the UID.

1. Traverse vector layers

Public ienumlayer getfeaturelayers ()
{
UID uid = new uidclass ();
UID. value = "{40a9e885-5533-11d0-98be-00805f7ced21}"; // featurelayer
Ienumlayer layers = frmmap. m_mapctrl.map.get_layers (UID, true );
Return layers;
}

2. traverse the raster layer

Public ienumlayer getrasterlayers ()
{
UID uid = new uidclass ();
UID. value = "{D02371C7-35F7-11D2-B1F2-00C04F8EDEFF}"; // rasterlayer
Ienumlayer layers = frmmap. m_mapctrl.map.get_layers (UID, true );
Return layers;
}

3. Traverse other layers

You only need to modify the UID. Common data types include:

{6ca416b1-e160-11d2-9f4e-00c04f6bc78e} idatalayer (including all types of layers)
{40a9e885-5533-11d0-98be-00805f7ced21} ifeaturelayer
E156D7E5-22AF-11D3-9F99-00C04F6BC78E} igeofeaturelayer
{34b2ef81-f4ac-11d1-a245-080009b6f22b} igraphicslayer
{5ceae408-4c0a-437f-9db3-054d83919850} ifdographicslayer
{0c22a4c7-dafd-11d2-9f46-00c04f6bc78e} icoverageannotationlayer
{EDAD6644-1810-11D1-86AE-0000F8751720} igrouplayer

4. Obtain the layer interface using the layer name

This is a common feature in AE development. It is easy to implement it in combination with the above method.

// Obtain the vector layer interface
Public ifeaturelayer getfeaturelayer (string layername)
{
// Get the layers from the maps
Ienumlayer layers = getfeaturelayers ();
Layers. Reset ();
Ilayer layer = NULL;
While (layer = layers. Next ())! = NULL)
{
If (layer. Name = layername)
Return layer as ifeaturelayer;
}
Return NULL;
}

// Obtain the raster layer interface
Public irasterlayer getrasterlayer (string layername)
{
// Get the layers from the maps
Ienumlayer layers = getrasterlayers ();
Layers. Reset ();
Ilayer layer = NULL;
While (layer = layers. Next ())! = NULL)
{
If (layer. Name = layername)
Return layer as irasterlayer;
}
Return NULL;
}
 

Obtain other layer interfaces, similar to this. This article from 3sdn reprinted please in the form of links to indicate the source URL: http://www.3sdn.net/gis2dev/ AE /2009-08-29/454.html