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Bonjour,
MapBasic offre l'ouverture du dialogue et renvoie le choix au format d'une clause CoordSys
Soit (en anglais):
ChooseProjection$( initial_coordsys, get_bounds )

initial_coordsys is a string value in the form of a Coordsys clause. It is used to set which coordinate system is selected when the dialog is first displayed.
If initial_coordsys is empty or an invalid coordsys clause, then the default longitude-latitude coordinate system is used as the initial selection.

get_bounds is a logical value that determines whether the users is prompted for boundary values when a non-earth projection is selected.
If get_bounds is true then the boundary dialog is displayed. If false, then the dialog is not displayed and the default boundary is used

Description

This function displays the Choose Projection dialog and returns the selected coordinate system as a string. The returned string is in the same format as the CoordSys clause. Use this function if you wish to allow the user to set a projection within your application.