Difference between revisions of "paszlib"
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====Zip files==== | ====Zip files==== | ||
− | Create a zip file named as parameter 1. Treats all other parameters as filenames to add. | + | Create a zip file named as parameter 1. Treats all other parameters as filenames to add, so you can specify e.g. |
− | <syntaxhighlight>uses | + | <syntaxhighlight language="dos">zipper newzip.zip autoexec.bat config.sys</syntaxhighlight> |
+ | |||
+ | <syntaxhighlight> | ||
+ | uses | ||
Zipper; | Zipper; | ||
var | var | ||
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OurZipper.Free; | OurZipper.Free; | ||
end; | end; | ||
− | end.</syntaxhighlight> | + | end. |
+ | </syntaxhighlight> | ||
====Unzip files==== | ====Unzip files==== |
Revision as of 13:39, 23 January 2014
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paszlib is a Pascal conversion of the standard zlib library: you don't need any external dependencies. It was implemented by Jacques Nomssi Nzali (his old homepage is dead, see a continuation of the project here). It is used in the FCL to implement the TCompressionStream class.
This class lets you compress and decompress .zip files.
The main unit of this package is paszlib. There are other, auxiliary units, but the only unit that needs to be included in a typical program is this one.
TZipper
TZipper implements support for compressing and decompressing .zip files, but does not support all zip compression methods.
Documentation
See official FPC documentation for Zipper
Examples
Zip files
Create a zip file named as parameter 1. Treats all other parameters as filenames to add, so you can specify e.g.
zipper newzip.zip autoexec.bat config.sys
uses
Zipper;
var
OurZipper: TZipper;
I: Integer;
begin
OurZipper := TZipper.Create;
try
OurZipper.FileName := ParamStr(1);
for I := 2 to ParamCount do
OurZipper.Entries.AddFileEntry(ParamStr(I), ParamStr(I));
OurZipper.ZipAllFiles;
finally
OurZipper.Free;
end;
end.
Unzip files
Unzip all files in archive c:\test.zip into directory c:\windows\temp\
uses
Zipper;
var
UnZipper: TUnZipper;
begin
UnZipper := TUnZipper.Create;
try
UnZipper.FileName := 'c:\test.zip';
UnZipper.OutputPath := 'c:\windows\temp';
UnZipper.Examine;
UnZipper.UnZipAllFiles;
finally
UnZipper.Free;
end;
end.
More examples can be found in the FPC source directory:
Unzip file to a stream
In Lazarus, drop a TMemo, TButton, TEdit and TFileNameEdit on a form. Clicking the button will read the zip file in FileNameEdit, extract the file specified in the Edit box, and display the content in Memo.
uses
Zipper;
...
procedure TForm1.Button1Click(Sender: TObject);
begin
ExtractFileFromZip(FileNameEdit1.FileName,Edit1.Text);
end;
procedure TForm1.DoCreateOutZipStream(Sender: TObject; var AStream: TStream;
AItem: TFullZipFileEntry);
begin
AStream:=TMemorystream.Create;
end;
procedure TForm1.DoDoneOutZipStream(Sender: TObject; var AStream: TStream;
AItem: TFullZipFileEntry);
begin
AStream.Position:=0;
Memo1.lines.LoadFromStream(Astream);
Astream.Free;
end;
procedure TForm1.ExtractFileFromZip(ZipName, FileName: string);
var
ZipFile: TUnZipper;
sl:TStringList;
begin
sl:=TStringList.Create;
sl.Add(FileName);
ZipFile := TUnZipper.Create;
try
ZipFile.FileName := ZipName;
ZipFile.OnCreateStream := @DoCreateOutZipStream;
ZipFile.OnDoneStream:=@DoDoneOutZipStream;
ZipFile.UnZipFiles(sl);
finally
ZipFile.Free;
sl.Free;
end;
end;
See also
Go back to Packages List