Backup файла. [D3, Win95/98]
inko © (2002-04-09 17:55:00)
Как создать резервную копию (Backup) файла, в том же каталоге,
где и оригинал?
AFROLOV (2002-04-09 17:59:00) [1]
Скопировать его в этот каталог под другим именем.
Пример из Help по Delphi
The following example uses a button, a string grid, and a
Save dialog box on a form. When the button is clicked, the user is
prompted for a filename. When the user clicks OK, the contents of
the string grid are written to the specified file. Additional
information is also written to the file so that it can be read
easily with the FileRead function.
procedure TForm1.Button1Click(Sender: TObject);
var
BackupName: string;
FileHandle: Integer;
StringLen: Integer;
X: Integer;
Y: Integer;
begin
if SaveDialog1.Execute then
begin
if FileExists(SaveDialog1.FileName) then
begin
BackupName := ExtractFileName(SaveDialog1.FileName);
BackupName := ChangeFileExt(BackupName, ".BAK");
if not RenameFile(SaveDialog1.FileName, BackupName) then
raise Exception.Create("Unable to create backup file.");
end;
FileHandle := FileCreate(SaveDialog1.FileName);
{ Write out the number of rows and columns in the grid. }
FileWrite(FileHandle,
StringGrid1.ColCount, SizeOf(StringGrid1.ColCount));
FileWrite(FileHandle,
StringGrid1.RowCount, SizeOf(StringGrid1.RowCount));
for X := 0 to StringGrid1.ColCount – 1 do
begin
for Y := 0 to StringGrid1.RowCount – 1 do
begin
{ Write out the length of each string, followed by the string
itself. }
StringLen := Length(StringGrid1.Cells[X,Y]);
FileWrite(FileHandle, StringLen, SizeOf(StringLen));
FileWrite(FileHandle,
StringGrid1.Cells[X,Y], Length(StringGrid1.Cells[X,Y]);
end;
end;
FileClose(FileHandle);
end;
end;
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