Differenze tra le versioni di "Estrarre con le funzioni del API di libzip i file contenuti da un file compresso .zip"
Da Gambas-it.org - Wikipedia.
Riga 1: | Riga 1: | ||
− | La libreria | + | La libreria ''libzip'' consente di gestire file compressi ''.zip''. |
Per poter fruire in gambas delle risorse della libreria ''libzip'', è necessario installare e richiamare la libreria condivisa: "''libzip.so.5.0'' " | Per poter fruire in gambas delle risorse della libreria ''libzip'', è necessario installare e richiamare la libreria condivisa: "''libzip.so.5.0'' " |
Versione delle 07:47, 18 mag 2023
La libreria libzip consente di gestire file compressi .zip.
Per poter fruire in gambas delle risorse della libreria libzip, è necessario installare e richiamare la libreria condivisa: "libzip.so.5.0 "
Mostriamo un esempio pratico per estrarre uno o più file contenuti in un file compresso .zip:
Library "libzip:5.0" Public Struct zip_stat valid As Long name As Pointer index As Long size As Long comp_size As Long mtime As Long crc As Integer comp_method As Short encryption_method As Short flags As Integer End Struct ' struct zip *zip_open(const char *, int, int *) ' Open zip archive. Private Extern zip_open(path As String, flags As Integer, errorp As Pointer) As Pointer ' zip_int64_t zip_get_num_entries(zip_t *, zip_flags_t) ' Get number of files in archive. Private Extern zip_get_num_entries(archive As Pointer, flags As Integer) As Long ' int zip_stat_index(struct zip *, int, int, struct zip_stat *) ' Get information about file by index. Private Extern zip_stat_index(archive As Pointer, index As Integer, flags As Integer, sb As Zip_stat) As Integer ' struct zip_file * zip_fopen_index(struct zip *, int, int) ' Open file in zip archive for reading by index Private Extern zip_fopen_index(archive As Pointer, index As Integer, flags As Integer) As Pointer ' zip_int64_t zip_fread(struct zip_file *, void *, zip_uint64_t) ' Read from file. Private Extern zip_fread(zfile As Pointer, buf As Byte[], nbytes As Long) As Long ' int zip_fclose(struct zip_file *) ' Close file in zip archive. Private Extern zip_fclose(zfile As Pointer) As Integer ' int zip_close(struct zip *) ' Close zip archive. Private Extern zip_close(archive As Pointer) As Integer Public Sub Main() Dim percorsoZip, decompresso As String Dim z, zf As Pointer Dim i, lun As Integer Dim zs As New Zip_stat Dim l As Long Dim fl As File Dim buf As New Byte[64] percorsoZip = "/percorso/del/file.zip" decompresso = "/percorso/ove/saranno/estratti/i/file" z = zip_open(percorsoZip, 0, 0) If z == 0 Then zip_close(z) Error.Raise("Impossibile aprire un file '.zip' !") Endif For i = 0 To zip_get_num_entries(z, 0) - 1 If zip_stat_index(z, i, 0, zs) = 0 Then lun = Len(String@(zs.name)) Print "Nome: "; String@(zs.name) Print "Dimensione: "; zs.size Print "mtime: "; zs.mtime If Right(String@(zs.name), 1) = "/" Then Continue Else zf = zip_fopen_index(z, i, 0) If zf == 0 Then zip_fclose(zf) Error.Raise("Errore alla funzione 'zip_fopen_index()' !") Endif fl = Open decompresso &/ File.Name(String@(zs.name)) For Create While l < zs.size lun = zip_fread(zf, buf, 64) If lun < 0 Then Error.Raise("Errore nella lettura del file !") buf.Write(fl, 0, lun) l += lun Wend fl.Close zip_fclose(zf) Endif Endif Next zip_close(z) End