tuksik / delphi-7-zip-api

A Delphi Wrapper around 7zip.dll

7-zip Delphi API

This API use the 7-zip dll (7z.dll) to read and write all 7-zip supported archive formats.

• Autor: Henri Gourvest [email protected]
• Licence: MPL1.1
• Date: 15/04/2009
• Version: 1.1

Reading archive:

Extract to path:

with CreateInArchive(CLSID_CFormatZip) do
begin
    OpenFile('c:\test.zip');
    ExtractTo('c:\test');
end;

Get file list:

with CreateInArchive(CLSID_CFormat7z) do
begin
OpenFile('c:\test.7z');
for i := 0 to NumberOfItems - 1 do
    if not ItemIsFolder[i] then
    Writeln(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
i: integer;
items: array[0..2] of Cardinal;
begin
with CreateInArchive(CLSID_CFormat7z) do
begin
    OpenFile('c:\test.7z');
    // items must be sorted by index!
    items[0] := 0;
    items[1] := 1;
    items[2] := 2;
    ExtractItems(@items, Length(items), false, nil, GetStreamCallBack);
end;
end;

Open stream

with CreateInArchive(CLSID_CFormatZip) do
begin
OpenStream(T7zStream.Create(TFileStream.Create('c:\test.zip', fmOpenRead), soOwned));
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);
begin
with CreateInArchive(CLSID_CFormatZip) do
begin
    OpenFile('c:\test.zip');
    SetProgressCallback(nil, ProgressCallback);
    ...
end;
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);
begin
with CreateInArchive(CLSID_CFormatZip) do
begin
    // using callback
    SetPasswordCallback(nil, PasswordCallback);
    // or setting password directly
    SetPassword('password');
    OpenFile('c:\test.zip');
    ...
end;
end;

Writing archive

procedure TMainForm.ExtractAllClick(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;