# FindAllFiles

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Unit: Lazarus fileutil

procedure FindAllFiles(AList: TStrings; const SearchPath: String;
SearchMask: String = ''; SearchSubDirs: Boolean = True; DirAttr: Word = faDirectory);

function FindAllFiles(const SearchPath: String; SearchMask: String = '';
SearchSubDirs: Boolean = True): TStringList;

FindAllFiles looks for files matching the searchmask in the SearchPath directory and if specified its children and populates a stringlist with the resulting filenames.

The mask can be a single mask like you can use with the FindFirst/FindNext functions, or it can consist of a list of masks, separated by a semicolon (;).
Spaces in the mask are treated as literals.

There are two overloaded versions of this routine. The first one is a procedure and assumes that the receiving stringlist already has been created. The second one is a function which creates the stringlist internally and returns it as a function result. In both cases the stringlist must be destroyed by the calling procedure.

Example:

uses
..., FileUtil, ...
var
PascalFiles: TStringList;
begin
PascalFiles := TStringList.Create;
try
FindAllFiles(PascalFiles, LazarusDirectory, '*.pas;*.pp;*.p;*.inc', true); //find e.g. all pascal sourcefiles
ShowMessage(Format('Found %d Pascal source files', [PascalFiles.Count]));
finally
PascalFiles.Free;
end;

// or

begin
//No need to create the stringlist; the function does that for you
PascalFiles := FindAllFiles(LazarusDirectory, '*.pas;*.pp;*.p;*.inc', true); //find e.g. all pascal sourcefiles
try
ShowMessage(Format('Found %d Pascal source files', [PascalFiles.Count]));
finally
PascalFiles.Free;
end;

IMPORTANT NOTE: The function "FindAllFiles" creates the stringlist internally. This may look very convenient at first sight, but it is very easy to create memory leaks that way:

  // DON'T EVER DO THIS !!!! - There is no way to destroy the stringlist created by FindAllFiles.
Listbox1.Items.Assign(FindAllFiles(LazarusDirectory, '*.pas;*.pp;*.p;*.inc', true);

Note: If you want to use this function in command line programs, add a project requirement for LCLBase, which will not pull in the entire LCL