Question about gtk_label_set_justify()

["chao yeaj" <yeajchao@xxxxxxxxx>]

Hello everyone

     You knowe ,there is a function called
gtk_label_set_justify(),which used to modify the label's text'sjustify
mode

      my code as follow
   GtkWidget *label = NULL;
   gtk_label_new(" I am label!");
   gtk_label_set_justify(GTK_LABEL(label),GTK_JUSTIFY_FILL);

    but ,this do not  work,  Why ?
   I need your help
Any comments would be much appreciated,and thanks in advance !
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