I've got a routine that converts a file into a different format and saves it. The original datafiles were numbered, but my routine gives the output a filename based on an internal name found in the original.
I tried to batch-run it on a whole directory, and it worked fine until I hit one file whose internal name had a slash in it. Oops! And if it does that here, it could easily do it on other files. Is there an RTL (or WinAPI) routine somewhere that will sanitize a string and remove invalid symbols so it's safe to use as a filename?
You can use PathGetCharType function, PathCleanupSpec function or the following trick:
function IsValidFilePath(const FileName: String): Boolean;
var
S: String;
I: Integer;
begin
Result := False;
S := FileName;
repeat
I := LastDelimiter('\/', S);
MoveFile(nil, PChar(S));
if (GetLastError = ERROR_ALREADY_EXISTS) or
(
(GetFileAttributes(PChar(Copy(S, I + 1, MaxInt))) = INVALID_FILE_ATTRIBUTES)
and
(GetLastError=ERROR_INVALID_NAME)
) then
Exit;
if I>0 then
S := Copy(S,1,I-1);
until I = 0;
Result := True;
end;
This code divides string into parts and uses MoveFile to verify each part. MoveFile will fail for invalid characters or reserved file names (like 'COM') and return success or ERROR_ALREADY_EXISTS for valid file name.
PathCleanupSpec is in the Jedi Windows API under Win32API/JwaShlObj.pas