7zip plugin Api

7zip plugin Api
This API use the 7-zip dll (7z.dll) to read and write all 7-zip supported archive formats..
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_CFormatZip) 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” Itemsfunction 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!
A 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;

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