public void Close()
{
_layer.Close();
}
/// <summary>
/// The test edit layer.
/// </summary>
/// <returns>
/// The <see cref="bool" />.
/// </returns>
private static bool TestEditLayer()
{
var layer = new OgrLayer();
layer.GlobalCallback = form;
if (!layer.OpenFromDatabase(CONNECTION_STRING, "buildings", true))
{
Debug.Print("Failed to open layer: " + layer.get_ErrorMsg(layer.LastErrorCode));
return(false);
}
// check if editing is supported for driver
Debug.Print("Driver supports editing: " + layer.TestCapability(tkOgrLayerCapability.olcRandomWrite));
// now check if we can actually do it, as there can be other limitations
if (!layer.get_SupportsEditing(tkOgrSaveType.ostSaveAll))
{
Debug.Print("Can't edit a layer: " + layer.get_ErrorMsg(layer.LastErrorCode));
layer.Close();
return(false);
}
Shapefile sf = layer.GetBuffer();
if (sf != null)
{
// possible types of editing
bool editValue = true;
bool addShape = true;
bool editShape = true;
bool removeShape = true;
if (editValue)
{
int shapeIndex = 0;
int fieldIndex = 2;
object val = sf.get_CellValue(fieldIndex, shapeIndex);
sf.EditCellValue(fieldIndex, shapeIndex, "test_writing");
// this flag will notify the driver that changes should saved back to source
sf.ShapeModified[shapeIndex] = true;
}
if (addShape)
{
int shapeIndex = sf.NumShapes;
Shape shp = sf.get_Shape(0);
shp = shp.Buffer(1, 50);
// modified flag is set automatically in this case
bool result = sf.EditInsertShape(shp, ref shapeIndex);
Debug.Print("Shape was inserted: " + result);
}
if (editShape)
{
// since shapefile is in in-memory mode, geometry of shapes can be changed directly;
// bear in mind that this won't work for file-based shapefiles, in that case get_Shape will
// populate Shape object which will have no futher link with parent shapefile
Shape shp = sf.get_Shape(sf.NumShapes - 1);
for (int i = 0; i < shp.numPoints; i++)
{
double x = 0.0, y = 0.0;
if (shp.get_XY(i, ref x, ref y))
{
shp.put_XY(i, x + 0.01, y + 0.01); // let's move it a little
}
}
}
if (removeShape)
{
bool result = sf.EditDeleteShape(sf.NumShapes - 1);
Debug.Print("Shape was deleted: " + result);
}
// saving it
int count;
tkOgrSaveResult saveResults = layer.SaveChanges(out count);
Debug.Print("Save result: " + saveResults);
Debug.Print("Number of shapes saved: " + count);
// displaying info on errors
for (int i = 0; i < layer.UpdateSourceErrorCount; i++)
{
Debug.Print(
"Error for shape id {0}: {1}",
layer.UpdateSourceErrorShapeIndex[i],
layer.UpdateSourceErrorMsg[i]);
}
return(true);
}
layer.Close();
return(false);
}
