SysUtils.FileDateToDateTime Function

Converts an OS timestamp value to TDateTime value.

Pascal

function FileDateToDateTime(FileDate: Integer): TDateTime;

C++

TDateTime FileDateToDateTime(int FileDate);

File

SysUtils

Description

A timestamp is a signed 32-bit integer, used by the OS to record information such as the date and time a file was modified. The precise format of a timestamp depends on the OS. Use FileDateToDateTime to convert a timestamp to a TDateTime value.

You may need to use FileDateToDateTime to convert the Time field of the TSearchRec type used by the FindFirst and FindNext functions.

C++ Examples:

Copy Code

/*
The following code reads a file's attributes into a set
variable, sets the check boxes in a file-attribute dialog
box to represent the current attributes, then executes the
dialog box. If the user changes and accepts any dialog box
settings, the code sets the file attributes to match the
changed settings:
*/
#include "fattrdlg.h"

void __fastcall TForm1::FileListMouseUp(TObject *Sender, TMouseButton Button,
      TShiftState Shift, int X, int Y)
{

  unsigned short  Attributes;
  unsigned short  NewAttributes;

  FileAttrDlg->FileDirName->Caption = FileList->Items->Strings[FileList->ItemIndex];
  FileAttrDlg->FilePathName->Caption = FileList->Directory;
  FileAttrDlg->ChangeDate->Caption = DateTimeToStr(FileDateToDateTime(FileAge(FileList->FileName)));
  Attributes = FileGetAttr(FileList->Items->Strings[FileList->ItemIndex]);
  FileAttrDlg->ReadOnly->Checked = Attributes & faReadOnly;
  FileAttrDlg->Archive->Checked = Attributes & faArchive;
  FileAttrDlg->System->Checked = Attributes & faSysFile;
  FileAttrDlg->Hidden->Checked = Attributes & faHidden;
  if (FileAttrDlg->ShowModal()!= mrCancel){
     NewAttributes = Attributes;
     if (FileAttrDlg->ReadOnly->Checked)
       NewAttributes = NewAttributes | faReadOnly;
     else
        NewAttributes = NewAttributes & ~faReadOnly;

     if (FileAttrDlg->Archive->Checked)
       NewAttributes = NewAttributes | faArchive;
     else
       NewAttributes = NewAttributes & ~faArchive;

     if (FileAttrDlg->System->Checked)
       NewAttributes = NewAttributes | faSysFile;
     else
       NewAttributes = NewAttributes & ~faSysFile;

     if (FileAttrDlg->Hidden->Checked)
       NewAttributes = NewAttributes | faHidden;
     else
       NewAttributes = NewAttributes  & ~faHidden;
     if (NewAttributes != Attributes)
       FileSetAttr(FileAttrDlg->FileDirName->Caption, NewAttributes);
  }
}

Delphi Examples:

Copy Code

{
The following code reads a file's attributes into a set
variable, sets the check boxes in a file-attribute dialog
box to represent the current attributes, then executes the
dialog box. If the user changes and accepts any dialog box
settings, the code sets the file attributes to match the
changed settings:
}
procedure TForm1.FileListMouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
var
  Attributes, NewAttributes: Word;
begin
  with FileAttrForm do
  begin
    FileDirName.Caption := FileList.Items[FileList.ItemIndex];
    { set box caption }
    FilePathName.Caption := FileList.Directory;
    { show directory name }
    ChangeDate.Caption := DateTimeToStr(FileDateToDateTime(FileAge(FileList.FileName)));
    Attributes := SysUtils.FileGetAttr(FileDirName.Caption);
    { read file attributes }
    ReadOnly.Checked := (Attributes and SysUtils.faReadOnly) = faReadOnly;
    Archive.Checked := (Attributes and faArchive) = faArchive;
    System.Checked := (Attributes and faSysFile) = faSysFile;
    Hidden.Checked := (Attributes and faHidden) = faHidden;
    if ShowModal <> id_Cancel then    { execute dialog box }
    begin
      NewAttributes := Attributes;
      { start with original attributes }
      if ReadOnly.Checked then
        NewAttributes := NewAttributes or SysUtils.faReadOnly
      else
        NewAttributes := NewAttributes and not SysUtils.faReadOnly;
      if Archive.Checked then
        NewAttributes := NewAttributes or faArchive
      else
        NewAttributes := NewAttributes and not faArchive;
      if System.Checked then
        NewAttributes := NewAttributes or faSysFile
      else
        NewAttributes := NewAttributes and not faSysFile;
      if Hidden.Checked then 
        NewAttributes := NewAttributes or faHidden
      else
        NewAttributes := NewAttributes and not faHidden;
      if NewAttributes <> Attributes then { if anything changed... }
        FileSetAttr(FileDirName.Caption, NewAttributes);
         { ...write the new values }
    end;
  end;
end;