Sapere con le funzioni esterne del API di Rhythmbox se un file contiene dati audio e/o video
Da Gambas-it.org - Wikipedia.
Con alcune funzioni esterne del API di Rhythmbox è possibile sapere se un file contiene dati audio e/o video.
E' necessario avere installata nel sistema e richiamare in Gambas la libreria condivisa: "librhythmbox-core.so.10.0.0 ".
Mostriamo di seguito un esempio pratico:
Library "librhythmbox-core:10.0.0"
' RBMetaData *rb_metadata_new (void)
' Creates a new metadata backend instance.
Private Extern rb_metadata_new() As Pointer
' void rb_metadata_load (RBMetaData *md, const char *uri, GError **error)
' Reads metadata information from the specified URI.
Private Extern rb_metadata_load(md As Pointer, uri As String, gerror As Pointer)
' gboolean rb_metadata_has_audio (RBMetaData *md)
' Retrieves the value of a metadata field extracted from the target URI.
Private Extern rb_metadata_has_audio(md As Pointer) As Boolean
' gboolean rb_metadata_has_video (RBMetaData *md)
' Retrieves the value of a metadata field extracted from the target URI.
Private Extern rb_metadata_has_video(md As Pointer) As Boolean
' void gst_object_unref(gpointer object)
' Decrements the reference count on object.
Private Extern gst_object_unref(gobject As Pointer)
Public Sub Main()
Dim uri as String
Dim met As Pointer
Dim bo as Boolean
uri = "file://"
met = rb_metadata_new()
If met == 0 Then Error.Raise("Errore !")
rb_metadata_load(met, uri & "/percorso/del/file", 0)
bo = rb_metadata_has_audio(met)
Print bo
bo = rb_metadata_has_video(met)
Print bo
gst_object_unref(met)
End
