7-zip Delphi API

• Author: Henri Gourvest hgourvest@progdigy.com
• Licence: MPL1.1
• Date: 2011-11-29
• Version: 1.2
• Original source at Google Code
• Extended version by Daniel Marschall 2024-05-15 with a lot of changes (see sevenzip.pas header for changelog)
• Example usage Demo added by Geoffrey Smith

This API use the 7-zip dll (7z.dll) to read and write all 7-zip supported archive formats. The latest 32-bit and 64-bit version of the 7z.dll is included in the repository (currently 24.08). According to the documentation, file formats listed below are supported, although many may only support decompression/extraction and not creation/compression.

• zip
• bz2
• rar
• arj
• z
• lzh
• 7z
• cab
• nsis
• lzma
• lzma86
• xz
• ppmd
• squashFS
• cramFS
• apm
• mslz
• flv
• swf
• swfc
• ntfs
• fat
• mbr
• vhd
• pe
• elf
• macho
• udf
• xar
• mub
• hfs
• dmg
• compound doc
• wim
• iso
• bkf
• chm
• split
• rpm
• deb
• cpio
• tar
• gzip

7-Zip Demo

This demo currently allows you to locate archives on your hard disk and list the contents of archive. It uses VirtualTree that you can get in the GetIt package manager in Delphi.

Reading archive:

Extract to path:

var
  archive : I7zInArchive;
begin
  archive := CreateInArchive(CLSID_CFormatZip);
  archive.OpenFile('c:\test.zip');
  archive.ExtractTo('c:\test');
end;

Get file list:

var
  archive : I7zInArchive;
  i : Integer;
begin
  archive := CreateInArchive(CLSID_CFormat7z);
  archive.OpenFile('c:\test.7z');
  for i := 0 to archive.NumberOfItems - 1 do
    if not archive.ItemIsFolder[i] then
      Writeln(archive.ItemPath[i]);
end;

Extract to stream

 with CreateInArchive(CLSID_CFormat7z) do
 begin
   OpenFile('c:\test.7z');
   for i := 0 to NumberOfItems - 1 do
     if not ItemIsFolder[i] then
       ExtractItem(i, stream, false);
 end;

Extract "n" Items

function GetStreamCallBack(sender: Pointer; index: Cardinal;
  var outStream: ISequentialOutStream): HRESULT; stdcall;
begin
  case index of ...
    outStream := T7zStream.Create(aStream, soReference);
  Result := S_OK;
end;

procedure TMainForm.ExtractClick(Sender: TObject);
var
  archive : I7zInArchive;
  i: integer;
  items: array[0..2] of Cardinal;
begin
  archive := CreateInArchive(CLSID_CFormat7z);
  archive.OpenFile('c:\test.7z');
    // items must be sorted by index!
  items[0] := 0;
  items[1] := 1;
  items[2] := 2;
  archive.ExtractItems(@items, Length(items), false, nil, GetStreamCallBack);
end;

Open stream

var
  archive : I7zInArchive;
begin
  archive := CreateInArchive(CLSID_CFormatZip) do
  archive.OpenStream(T7zStream.Create(TFileStream.Create('c:\test.zip', fmOpenRead), soOwned));
  archive.OpenStream(aStream, soReference);
   ...
end;

Progress bar

function ProgressCallback(sender: Pointer; total: boolean; value: int64): HRESULT; stdcall;
begin
  if total then
    Mainform.ProgressBar.Max := value 
  else
    Mainform.ProgressBar.Position := value;
  Result := S_OK;
end;

procedure TMainForm.ExtractClick(Sender: TObject);
var
  archive : I7zInArchive;
begin
  archive := CreateInArchive(CLSID_CFormatZip);
  archive.OpenFile('c:\test.zip');
  archive.SetProgressCallback(nil, ProgressCallback);
  ...
end;

Password

function PasswordCallback(sender: Pointer; var password: WideString): HRESULT; stdcall;
begin
  // call a dialog box ...
  password := 'password';
  Result := S_OK;
end;

procedure TMainForm.ExtractClick(Sender: TObject);
var
  archive : I7zInArchive;
begin
  archive := CreateInArchive(CLSID_CFormatZip);
  // using callback
  archive.SetPasswordCallback(nil, PasswordCallback);
  // or setting password directly
  archive.SetPassword('password');
  archive.OpenFile('c:\test.zip');
     ...
end;

Writing archive

 procedure TMainForm.PackFilesClick(Sender: TObject);
var
  Arch: I7zOutArchive;
begin
  Arch := CreateOutArchive(CLSID_CFormat7z);
  // add a file
  Arch.AddFile('c:\test.bin', 'folder\test.bin');
  // add files using willcards and recursive search
  Arch.AddFiles('c:\test', 'folder', '*.pas;*.dfm', true);
  // add a stream
  Arch.AddStream(aStream, soReference, faArchive, CurrentFileTime, CurrentFileTime, 'folder\test.bin', false, false);
  // compression level
  SetCompressionLevel(Arch, 5);
  // compression method if <> LZMA
  SevenZipSetCompressionMethod(Arch, m7BZip2);
  // add a progress bar ...
  Arch.SetProgressCallback(...);
  // set a password if necessary
  Arch.SetPassword('password');
  // Save to file
  Arch.SaveToFile('c:\test.zip');
  // or a stream
  Arch.SaveToStream(aStream);
end;