Conoscere il mime-type di un file mediante le funzioni esterne del API di libmagic
Da Gambas-it.org - Wikipedia.
Versione del 1 giu 2017 alle 20:39 di Vuott (Discussione | contributi)
E' possibile conoscere il Mime-Type di un file mediante alcune risorse della libreria Libmagic.
Sarà necessario avere installata nel proprio sistema e richiamare in Gambas la libreria (nella sua attuale versione): libmagic.so.1.0.0
Mostriamo un semplice esempio:
Library "libmagic:1.0.0"
Private MAGIC_MIME_TYPE As Integer = &10
Private MAGIC_MIME_ENCODING As Integer = &400
Private MAGIC_MIME As Integer = MAGIC_MIME_TYPE Or MAGIC_MIME_ENCODING
' magic_t magic_open(int)
' Creates a magic cookie pointer and returns it.
Private Extern magic_open(mg As Integer) As Pointer
' int magic_load(magic_t, const char *)
' Loads the the colon separated list of database files passed in as file name.
Private Extern magic_load(magic_t As Pointer, filename As String) As Integer
' const char *magic_file(magic_t, const char *)
' Returns a textual description of the contents of the file.
Private Extern magic_file(magic_t As Pointer, filename As String) As String
' void magic_close(magic_t)
' Closes the magic database and deallocates any resources used.
Private Extern magic_close(magic_t As Pointer)
Public Sub Main()
Dim magic As Pointer
Dim err As Integer
magic = magic_open(MAGIC_MIME)
If magic = 0 Then Error.Raise("Impossibile inizializzare la libreria 'magic' !")
err = magic_load(magic, Null)
If err <> 0 Then
ChiudeMagic(magic)
Error.Raise("Impossibile caricare il database di 'magic' !")
Endif
Print magic_file(magic, "/percorso/del/file")
ChiudeMagic(magic)
End
Private Procedure ChiudeMagic(mgc As Pointer)
magic_close(mgc)
End
