Creating Compressed (Zipped) Folder using Delphi - delphi

Question

Can I create Windows XP's Compressed (Zipped) Folder using Delphi?

Answer 1

If you are using Delphi X2, just use TZipFile from System.Zip:
To Zip a folder, use:
TZipFile.ZipDirectoryContents('ZipFile.zip', 'C:\Zip\this\right\now');
To Zip files, use:
Zip := TZipFile.Create;
try
Zip.Open('ZipFile.zip', zmWrite);
Zip.Add('FileToBeZipped.txt');
Zip.Add('ThisWillBeCompressedAgainForSureAndBecomeSmaller.zip');
finally
Zip.Free;
end

Answer 2

According to a thread in eggheadcafe, you can use CreateFile Function with FILE_FLAG_BACKUP_SEMANTICS to create a Compressed Folder.
For shell extensions route, take a look at Using Windows XP "Compressed Folder" shell extension to work with .zip files by Namespace Edanmo, which is written in VB.
I just found the similar question asked on C++. Take a look at Creating a ZIP file on Windows (XP/2003) in C/C++. I have a feeling the easiest route is buying ZipForge. See Zip a file in Delphi code sample.

Answer 3

Some time ago, I've tried all of the Delphi compression libraries that I could find, and eventually I ended up using KaZip by Kiril Antonov.
My requirements were:
Free;
Open source;
Native Delphi code;
No external dependencies (dll, exe). My most important requirement;
Small memory footprint;
Easy to use;
I use it mainly to turn .kml files into .kmz, and it does that amazingly fast.
Here's an example of how I use it:
uses
KaZip;
...
// replaces a .kml file with a .kmz file
procedure KmlToKmz(const aFileName: string);
var
FS: TFileStream;
KaZip:TKaZip;
KmzFileName:TFileName;
begin
KmzFileName := ChangeFileExt(aFileName, '.kmz');
KaZip := TKaZip.Create(nil);
try
// create an empty zipfile with .kmz extension:
FS := TFileStream.Create(KmzFileName, fmOpenReadWrite or FmCreate);
try
KaZip.CreateZip(FS);
finally
FS.Free;
end;
KaZip.Open(KmzFileName); // Open the new .kmz zipfile
KaZip.Entries.AddFile(aFileName); // add the .kml
KaZip.Close;
DeleteFile(aFileName); // delete the .kml
finally
KaZip.Free;
end;
end;

Answer 4

Take a look at this OpenSource SynZip unit. It's even faster for decompression than the default unit shipped with Delphi, and it will generate a smaller exe (crc tables are created at startup).
No external dll is needed. Works from Delphi 6 up to XE. No problem with Unicode version of Delphi. All in a single unit.
I just made some changes to handle Unicode file names inside Zip content, not only Win-Ansi charset but any Unicode chars. Feedback is welcome.

Answer 5

You could use TurboPower Abbrevia which is now open source.

Answer 6

A "zipped" folder in Windows is nothing more than a .ZIP file compressed using any standard zip library. Compressed folders are a different animal and require an NTFS disk format.
For the "Zip" file, I strongly suggest the Turbo Power Abbrevia, which is open source and works well. You might want to check this alternate site if your using Delphi 2009 as it might be a more recent copy.
If your wanting to use the compressed folders option, you will need to modify the directory flags on the directory handle. This will only impact NEW files added to that directory and will not automatically compress existing files. If you have an existing directory you are trying to compress, then rename each existing file, and load and save it back to the original name deleting the original file when complete with each one. Yozey had a good link to the MSDN documentation. Just remember that this only works with NTFS formatted disks, so you will need to add a check for that in your code.

Answer 7

You can use some command line version of any compressor like 7zip and do the task using ShellExecute, or you can use a free or comercial component like anyone of these.
I had used ZipMaster and it behaves very well for my purpose. I don't know what are your size, space and performance requirements.

Answer 8

Take a look at these:
File Compression
FSCTL_SET_COMPRESSION

Answer 9

The TZipFile.ZipDirectoryContents method did not work for me, so I created my own implementation using TZipFile.add(). I am posting it here if anyone needs it.
procedure CreateZipOfDirectory(directory: string);
var
zip: TZipFile;
Arr: tarray<string>;
str: string;
function GetAllFilesInDir(const Dir: string): tarray<string>;
var
Search: TSearchRec;
procedure addAll(arr: tarray<string>; parent: string);
var
tmp: string;
begin
for tmp in arr do
begin
setlength(result, length(result) + 1);
result[length(result) - 1] := IncludeTrailingBackslash(parent) + tmp;
end;
end;
begin
setlength(result, 0);
if FindFirst(IncludeTrailingBackslash(Dir) + '*.*', faAnyFile or faDirectory, Search) = 0 then
try
repeat
if (Search.Attr and faDirectory) = 0 then
begin
setlength(result, length(result) + 1);
result[length(result) - 1] := Search.Name;
end
else if (Search.Name <> '..') and (Search.Name <> '.') then
addAll(GetAllFilesInDir(IncludeTrailingBackslash(Dir) + Search.Name), Search.Name);
until FindNext(Search) <> 0;
finally
FindClose(Search);
end;
end;
begin
Zip := TZipFile.Create;
try
Zip.Open('Foo.zip', zmWrite);
arr := GetAllFilesInDir(directory); // The Delphi TZipFile.ZipDirectoryContents does not work properly, so let's create our own.
for str in arr do
zip.Add(directory + str, str); // Add the second parameter to make sure that the file structure is preserved.
finally
zip.Free;
end;
end;