man Blt_TreeExists (Fonctions bibliothèques) - Indicates if a tree exists.

NAME

Blt_TreeExists - Indicates if a tree exists.

#include <bltTree.h>

int 
Blt_TreeExists(interp, name)

Interpreter to determine current namespace context. Name of an existing tree data object. Can be qualified by a namespace.

This procedure determines if a C-based tree data object exists by a given name. The arguments are as follows:

interp: Used the determine the current namespace context.
name: Name of an existing tree data object. Name can be qualified by a namespace such as CWfred::myTree. If no namespace qualifier is used, the current namespace is searched, then the global namespace.

A boolean result is returned. If the tree exists 1 is returned, 0 otherwise.

The following example checks if a tree "myTree" exists. if (!Blt_TreeExists(interp, "myTree")) { fprintf(stderr, "can't find tree \"myTree\\n"); }

tree, token Tcl_TreeCreate, Tcl_TreeGetToken, Tcl_TreeReleaseToken