Delphi DLL

Iterate over Files and Directories in Filesystem Directory Tree

Demonstrates how to use the Chilkat DirTree object/class to iterate over the names of files and sub-directories in a directory tree.

This example iterates over a directory tree that contains these files and sub-directories:

a
    images (sub-directory)
        dudeA.gif
        Thumbs.db
    hamlet.xml
    pigs.xml
    Setup.exe
b
    yyy (sub-directory)
    zzz (sub-directory)
        HelloWorld123.txt
        test123.txt
    dude.gif
    dudeC.gif
    hello.txt
    Thumbs.db
test123.txt

The output for the code below looks like this:

(sub-directory)
Relative Path: a
Absolute Path: c:\temp\abc123\a
Absolute UNC Path: \\?\c:\temp\abc123\a
----
(sub-directory)
Relative Path: b
Absolute Path: c:\temp\abc123\b
Absolute UNC Path: \\?\c:\temp\abc123\b
----
Size in bytes: 15
Relative Path: test123.txt
Absolute Path: c:\temp\abc123\test123.txt
Absolute UNC Path: \\?\c:\temp\abc123\test123.txt
----
Size in bytes: 279658
Relative Path: a\hamlet.xml
Absolute Path: c:\temp\abc123\a\hamlet.xml
Absolute UNC Path: \\?\c:\temp\abc123\a\hamlet.xml
----
(sub-directory)
Relative Path: a\images
Absolute Path: c:\temp\abc123\a\images
Absolute UNC Path: \\?\c:\temp\abc123\a\images
----
Size in bytes: 8463
Relative Path: a\pigs.xml
Absolute Path: c:\temp\abc123\a\pigs.xml
Absolute UNC Path: \\?\c:\temp\abc123\a\pigs.xml
----
Size in bytes: 24576
Relative Path: a\Setup.exe
Absolute Path: c:\temp\abc123\a\Setup.exe
Absolute UNC Path: \\?\c:\temp\abc123\a\Setup.exe
----
Size in bytes: 6221
Relative Path: b\dude.gif
Absolute Path: c:\temp\abc123\b\dude.gif
Absolute UNC Path: \\?\c:\temp\abc123\b\dude.gif
----
Size in bytes: 6221
Relative Path: b\dudeC.gif
Absolute Path: c:\temp\abc123\b\dudeC.gif
Absolute UNC Path: \\?\c:\temp\abc123\b\dudeC.gif
----
Size in bytes: 13
Relative Path: b\hello.txt
Absolute Path: c:\temp\abc123\b\hello.txt
Absolute UNC Path: \\?\c:\temp\abc123\b\hello.txt
----
Size in bytes: 10240
Relative Path: b\Thumbs.db
Absolute Path: c:\temp\abc123\b\Thumbs.db
Absolute UNC Path: \\?\c:\temp\abc123\b\Thumbs.db
----
(sub-directory)
Relative Path: b\yyy
Absolute Path: c:\temp\abc123\b\yyy
Absolute UNC Path: \\?\c:\temp\abc123\b\yyy
----
(sub-directory)
Relative Path: b\zzz
Absolute Path: c:\temp\abc123\b\zzz
Absolute UNC Path: \\?\c:\temp\abc123\b\zzz
----
Size in bytes: 6221
Relative Path: a\images\dudeA.gif
Absolute Path: c:\temp\abc123\a\images\dudeA.gif
Absolute UNC Path: \\?\c:\temp\abc123\a\images\dudeA.gif
----
Size in bytes: 6144
Relative Path: a\images\Thumbs.db
Absolute Path: c:\temp\abc123\a\images\Thumbs.db
Absolute UNC Path: \\?\c:\temp\abc123\a\images\Thumbs.db
----
Size in bytes: 6080
Relative Path: b\zzz\HelloWorld123.txt
Absolute Path: c:\temp\abc123\b\zzz\HelloWorld123.txt
Absolute UNC Path: \\?\c:\temp\abc123\b\zzz\HelloWorld123.txt
----
Size in bytes: 15
Relative Path: b\zzz\test123.txt
Absolute Path: c:\temp\abc123\b\zzz\test123.txt
Absolute UNC Path: \\?\c:\temp\abc123\b\zzz\test123.txt
----

Delphi DLL

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, DirTree;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
dirTree: HCkDirTree;
doneIterating: Boolean;

begin
success := False;

dirTree := CkDirTree_Create();

// Specify the root of the directory tree to be traversed.
CkDirTree_putBaseDir(dirTree,'c:/temp/abc123');

// Indicate that we want to recursively traverse the tree.
CkDirTree_putRecurse(dirTree,True);

// Begin the directory tree traversal.
success := CkDirTree_BeginIterate(dirTree);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkDirTree__lastErrorText(dirTree));
    Exit;
  end;

doneIterating := CkDirTree_getDoneIterating(dirTree);
while doneIterating <> True do
  begin

    // Examine the file or directory at the current traversal position:
    if (CkDirTree_getIsDirectory(dirTree) = True) then
      begin
        Memo1.Lines.Add('(sub-directory)');
      end
    else
      begin
        Memo1.Lines.Add('Size in bytes: ' + IntToStr(CkDirTree_getFileSize32(dirTree)));
        // If the file size is larger than 2GB, then get the size as a decimal string.
        // (Chilkat provides a FileSize64 method in *some* programming languages. The FileSizeStr property is added in Chilkat v9.5.0.88)
        Memo1.Lines.Add('Size in bytes: ' + CkDirTree__fileSizeStr(dirTree));
      end;

    Memo1.Lines.Add('Relative Path: ' + CkDirTree__relativePath(dirTree));
    Memo1.Lines.Add('Absolute Path: ' + CkDirTree__fullPath(dirTree));
    Memo1.Lines.Add('Absolute UNC Path: ' + CkDirTree__fullUncPath(dirTree));
    Memo1.Lines.Add('----');

    // Advance to the next file or sub-directory in the tree traversal.
    success := CkDirTree_AdvancePosition(dirTree);
    if (success <> True) then
      begin
        if (CkDirTree_getDoneIterating(dirTree) <> True) then
          begin
            Memo1.Lines.Add(CkDirTree__lastErrorText(dirTree));
            Exit;
          end;
      end;

    doneIterating := CkDirTree_getDoneIterating(dirTree);
  end;

CkDirTree_Dispose(dirTree);

end;