Daten schrittweise in Textdatei speichern

[mleyen]

@himi: ja stimmt, diese konvertiererei dieser Urzeitunits macht mich total Kirre...
Aber ich hab hier noch eine andere Variante, die dich bestimmt interessiert

Delphi-Quellcode:

function SetFilePointer(hFile: Cardinal; lDistanceToMove: Longint; lpDistanceToMoveHigh: Pointer;
                        dwMoveMethod: Cardinal): Cardinal; stdcall; external kernel32 name 'SetFilePointer';

function FileExists(const FileName: string; const PFileSize: PInt64 = nil): Boolean; {$IFDEF Inln}inline;{$ENDIF}
var
  myFile: Cardinal;
  myFindData: TWin32FindData;
  TheInt64: Int64;
begin
  myFile := FindFirstFile(@FileName[1], myFindData);
  Result := myFile <> INVALID_HANDLE_VALUE;
  if Result then
  begin
    FindClose(myFile);
    if PFileSize <> nil then
    begin
      TheInt64 := PFileSize^;
      Int64Rec(TheInt64).Lo := myFindData.nFileSizeLow;
      Int64Rec(TheInt64).Hi := myFindData.nFileSizeHigh;
      PFileSize^ := TheInt64;
    end;
  end;
end;

function OpenFile(const FileName: string; var hFile: Cardinal; const PFileSize: PInt64 = nil): Boolean; {$IFDEF Inln}inline;{$ENDIF}
begin
  Result := FileExists(FileName, PFileSize);
  if Result then
  begin
    hFile := CreateFile(@FileName[1], GENERIC_READ or GENERIC_WRITE, 0, nil, OPEN_EXISTING, 0, 0);
    Result := hFile <> INVALID_HANDLE_VALUE;
  end;
end;

function WriteFileStr(const hFile: Cardinal; const AStr: string): Boolean; {$IFDEF Inln}inline;{$ENDIF}
var
  Size, BytesWritten: Cardinal;
begin
  Size := Length(AStr)*SizeOf(Char);
  Result :=
    (WriteFile(hFile, AStr[1], Size, BytesWritten, nil)) and
    (Size = BytesWritten);
end;

function AddTextToFile(const Text, FilePath: string): Boolean; {$IFDEF Inln}inline;{$ENDIF}
var
  hFile: Cardinal;
  fs: UInt64;
begin
  Result := false;
  if not OpenFile(FilePath, hFile, @fs) then
    Exit;
  if SetFilePointer(hFile, fs+Length(Text)*SizeOf(Char), nil, FILE_BEGIN) = fs+Length(Text)*SizeOf(Char) then
  begin
    SetEndOfFile(hFile);
    Result :=
      (SetFilePointer(hFile, fs, nil, FILE_BEGIN)=fs) and
      WriteFileStr(hFile, Text);
  end;
  CloseHandle(hFile);
end;