SWU_listToCArray

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SWU_listToCArray

SWU_listToCArray is a library procedure which allows users to convert Tcl list to a C array of type long, integer, float or double. The input data is a Tcl list's name and a C array type.

package require SWU

SWU_listToCArray Tcl_list C_array_type

Tcl_list: Tcl list, which elements are to be assigned to the elements of the C array. See Tcl documentation regarding Tcl lists.
C_array_type: See C documentation regarding numeric types.

Return Value

If the procedure succeeds then it returns the ID of a C array of type C_array_type filled with values of the Tcl list's elements, otherwise an error message string is returned on the Tk console's command line.

Side Effects

None.

Examples

set varList [list 2.34 3.12 5.34 567.98 456.3]

2.34 3.12 5.34 567.98 456.3

set arrayID [SWU_listToCArray $varList float]

FloatArray1

set arrayID

FloatArray1

puts [access $arrayID 3]

567.98

This example sets the Tcl list varList to the list of numbers, converts varList to a C array of type float, and prints out the fourth element of the C array.