AddMITABLayerToWorkspace()

Summary

Adds a MapInfo TAB file layer to an application without it appearing in a map or dataview.

 

Syntax

AddMITABLayerToWorkspace(string layer_name, string file_name, array options)

 

Argument	Contents
layer_name	The desired name for the layer in the map
file_name	The full path and file name of the MapInfo TAB file

 

Option	Type	Contents
Type	String	The type of features to import: "Point", "Line", or "Area" (required)
Read Only	Boolean	"True" to open read only, "False" (default) otherwise
Shared	Boolean	"True" to open shared, "False" (default) otherwise; "False" sets the Exclusive mode
NAD Conversion	3 strings	Input datum, output datum, and conversion file (if needed); the input and output datums should be different
Projection	String, array	The projection name and the array of options
Transform	Array	Array indicating the transformation to apply to coordinates in the file. This can have three forms:1. An array of two or more four-element arrays containing local and world coordinates for control points, for example, {{real localX1, real localY1, real longitude1, real latitude1}, ...}2. An array of four elements - {real X_multiplier, real Y_multiplier, real X_offset, real Y_offset}3. Center and Extent transform {c1_x, c1_y, width_1, c2_x, c2_y, width_2} where center is shifted from (c1_x,c1_y) to (c2_x,c2_y), and vector of length width_1 out of c_1 becomes a vector of length width_2 out of c_2.

 

Returns

A string indicating the actual name of the layer, which is identical to layer_name unless the layer name is already in use.

 

Notes

• The Type option is required.

• For more details on the NAD Conversion option, see Datum Conversions.

• For more details on the Projection option, see Using Projections and Coordinate Systems.

Example

lyr = AddMITABLayerToWorkspace("Centerlines", "c:\\mysample.tab", {

{"Type", "Line"}, 

{"Projection", "utm", {"zone=12", "units=m"}}, 

{"NAD Conversion", "NAD27", "NAD83",} 

}) 

nrecs = GetRecordCount(lyr)

DropLayerFromWorkspace(lyr)

ShowMessage("There are " + String(nrecs) + " centerlines.")

 

Error Codes

Error Type	Meaning
Error	The file is not a valid MapInfo TAB file, or one of the parameters is invalid
NotFound	There is no file with the specified name

 

See Also

Function	Summary
AddMITABLayer()	Adds a layer from a MapInfo TAB file to a map
ImportMIF()	Imports features from an MIF file into a geographic file