Title: Fileoperations on a whole tree
Question: How to implement a general function that can be used by other function to manipulate the file system.
Answer:
The function GetAllFiles will be the base function to easily
implement operations that apply to a whole directory tree.
GetAllFiles retrieves in a stringlist all files that match the
criteria. The clou is the recursive call of the function.
procedure GetAllFiles(aPathPlusMask:string;aSubFolders: boolean;
aResultList: TStringList);
var Search: TSearchrec;
hDir: string;
hMask: string;
begin
hMask := aPathPlusMask;
hDir := ExtractFilepath(aPathPlusMask);
if hDir[length(hDir)]'\' then hDir := hDir + '\';
// Attention: FindFirst finds all files in the actual folder
// if hDir is not valid
if not DirectoryExists(hDir) then
EXIT;
if FindFirst(hMask, $23, Search)= 0 then
repeat
aResultList.Add(hDir + Search.Name);
until FindNext(Search)0;
if aSubFolders then
if FindFirst(hDir + '*.*',fadirectory, Search)= 0 then
repeat
if((search.attr and fadirectory)=fadirectory) and
(search.name[1]'.') then
GetAllFiles(hDir+Search.Name+'\'+hMask, aSubFolders,
aResultList);
until FindNext(Search) 0;
end;
Now its easy to implement a function that sets all files attributes:
procedure SetAllFilesAttr(aPathPlusMask: string;
aSubFolders: boolean;
aAttr: Integer);
var i: integer;
hStrList: TStringList;
begin
hStrList:= TStringList.Create;
GetAllFiles(aPathPlusMask,aSubFolders, hStrList);
for i := 0 to hStrlist.Count - 1 do
FileSetAttr(hStrlist[i], aAttr);
hStrList.Destroy;
end;
The call would look like this:
SetAllFilesAttr('*.*', false, faArchive );
Functions like CopyAllFiles or FindInFiles can by realized the
same way !