怎样将一个文件夹压缩成一个文件？

Question

我要将一个文件夹压缩成一个文件，需要的时候再解压缩，请问在程序中如何实现？

Answer 1

//参考如下代码～～
unit Unit1;interfaceuses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls, Buttons;type
  TForm1 = class(TForm)
    ButtonCompression: TButton;
    ButtonDecompression: TButton;
    EditFileName: TEdit;
    EditDirectory: TEdit;
    SpeedButtonFileName: TSpeedButton;
    SpeedButtonDirectory: TSpeedButton;
    OpenDialog1: TOpenDialog;
    procedure ButtonCompressionClick(Sender: TObject);
    procedure ButtonDecompressionClick(Sender: TObject);
    procedure SpeedButtonFileNameClick(Sender: TObject);
    procedure SpeedButtonDirectoryClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;var
  Form1: TForm1;implementation{$R *.dfm}(*//
标题:压缩和解压目录
说明:利用ZLib单元;不处理空目录
设计:Zswang
日期:2003-09-06
支持:[email protected]
//*)///////Begin Source
uses ZLib, FileCtrl;const cBufferSize = $4096;function FileCompression(mFileName: TFileName; mStream: TStream): Integer;
var
  vFileStream: TFileStream;
  vBuffer: array[0..cBufferSize]of Char;
  vPosition: Integer;
  I: Integer;
begin
  Result := -1;
  if not FileExists(mFileName) then Exit;
  if not Assigned(mStream) then Exit;
  vPosition := mStream.Position;
  vFileStream := TFileStream.Create(mFileName, fmOpenRead or fmShareDenyNone);
  with TCompressionStream.Create(clMax, mStream) do try
    for I := 1 to vFileStream.Size div cBufferSize do begin
      vFileStream.Read(vBuffer, cBufferSize);
      Write(vBuffer, cBufferSize);
    end;
    I := vFileStream.Size mod cBufferSize;
    if I > 0 then begin
      vFileStream.Read(vBuffer, I);
      Write(vBuffer, I);
    end;
  finally
    Free;
    vFileStream.Free;
  end;
  Result := mStream.Size - vPosition; //增量
end; { FileCompression }function FileDecompression(mFileName: TFileName; mStream: TStream): Integer;
var
  vFileStream: TFileStream;
  vBuffer: array[0..cBufferSize]of Char;
  I: Integer;
begin
  Result := -1;
  if not Assigned(mStream) then Exit;
  ForceDirectories(ExtractFilePath(mFileName)); //创建目录
  
  vFileStream := TFileStream.Create(mFileName, fmCreate or fmShareDenyWrite);  with TDecompressionStream.Create(mStream) do try
    repeat
      I := Read(vBuffer, cBufferSize);
      vFileStream.Write(vBuffer, I);
    until I = 0;
    Result := vFileStream.Size;
  finally
    Free;
    vFileStream.Free;
  end;
end; { FileDecompression }function StrLeft(const mStr: string; mDelimiter: string): string;
begin
  Result := Copy(mStr, 1, Pos(mDelimiter, mStr) - 1);
end; { StrLeft }function StrRight(const mStr: string; mDelimiter: string): string;
begin
  if Pos(mDelimiter, mStr) > 0 then
    Result := Copy(mStr, Pos(mDelimiter, mStr) + Length(mDelimiter), MaxInt)
  else Result := '';
end; { StrRight }type
  TFileHead = packed record
    rIdent: string[3]; //标识
    rVersion: Byte; //版本
  end;const
  cIdent: string[3] = 'zsf';
  cVersion = $01;
  cErrorIdent = -1;
  cErrorVersion = -2;function DirectoryCompression(mDirectory, mFileName: TFileName): Integer;
var
  vFileInfo: TStrings;
  vFileInfoSize: Integer;
  vFileInfoBuffer: PChar;
  vFileHead: TFileHead;  vMemoryStream: TMemoryStream;
  vFileStream: TFileStream;  procedure pAppendFile(mSubFile: TFileName);
  begin
    vFileInfo.Append(Format('%s|%d',
      [StringReplace(mSubFile, mDirectory + '\', '', [rfReplaceAll, rfIgnoreCase]),
        FileCompression(mSubFile, vMemoryStream)]));
    Inc(Result);
  end; { pAppendFile }  procedure pSearchFile(mPath: TFileName);
  var
    vSearchRec: TSearchRec;
    K: Integer;
  begin
    K := FindFirst(mPath + '\*.*', faAnyFile, vSearchRec);
    while K = 0 do begin
      if (vSearchRec.Attr and faDirectory > 0) and
        (Pos(vSearchRec.Name, '..') = 0) then
        pSearchFile(mPath + '\' + vSearchRec.Name)
      else if Pos(vSearchRec.Name, '..') = 0 then
        pAppendFile(mPath + '\' + vSearchRec.Name);
      K := FindNext(vSearchRec);
    end;
    FindClose(vSearchRec);
  end; { pSearchFile }
begin
  Result := 0;
  if not DirectoryExists(mDirectory) then Exit;
  vFileInfo := TStringList.Create;
  vMemoryStream := TMemoryStream.Create;
  mDirectory := ExcludeTrailingPathDelimiter(mDirectory);  vFileStream := TFileStream.Create(mFileName, fmCreate or fmShareDenyWrite);
  try
    pSearchFile(mDirectory);
    vFileInfoBuffer := vFileInfo.GetText;
    vFileInfoSize := StrLen(vFileInfoBuffer);    { DONE -oZswang -c添加 : 写入头文件信息 }
    vFileHead.rIdent := cIdent;
    vFileHead.rVersion := cVersion;
    vFileStream.Write(vFileHead, SizeOf(vFileHead));    vFileStream.Write(vFileInfoSize, SizeOf(vFileInfoSize));
    vFileStream.Write(vFileInfoBuffer^, vFileInfoSize);
    vMemoryStream.Position := 0;
    vFileStream.CopyFrom(vMemoryStream, vMemoryStream.Size);
  finally
    vFileInfo.Free;
    vMemoryStream.Free;
    vFileStream.Free;
  end;
end; { DirectoryCompression }function DirectoryDecompression(mDirectory, mFileName: TFileName): Integer;
var
  vFileInfo: TStrings;
  vFileInfoSize: Integer;
  vFileHead: TFileHead;  vMemoryStream: TMemoryStream;
  vFileStream: TFileStream;
  I: Integer;
begin
  Result := 0;
  if not FileExists(mFileName) then Exit;
  vFileInfo := TStringList.Create;
  vMemoryStream := TMemoryStream.Create;
  mDirectory := ExcludeTrailingPathDelimiter(mDirectory);
  vFileStream := TFileStream.Create(mFileName, fmOpenRead or fmShareDenyNone);
  try
    if vFileStream.Size < SizeOf(vFileHead) then Exit;
    { DONE -oZswang -c添加 : 读取头文件信息 }
    vFileStream.Read(vFileHead, SizeOf(vFileHead));
    if vFileHead.rIdent <> cIdent then Result := cErrorIdent;
    if vFileHead.rVersion <> cVersion then Result := cErrorVersion;
    if Result <> 0 then Exit;    vFileStream.Read(vFileInfoSize, SizeOf(vFileInfoSize));
    vMemoryStream.CopyFrom(vFileStream, vFileInfoSize);
    vMemoryStream.Position := 0;
    vFileInfo.LoadFromStream(vMemoryStream);    for I := 0 to vFileInfo.Count - 1 do begin
      vMemoryStream.Clear;
      vMemoryStream.CopyFrom(vFileStream,
        StrToIntDef(StrRight(vFileInfo[I], '|'), 0));
      vMemoryStream.Position := 0;
      FileDecompression(mDirectory + '\' + StrLeft(vFileInfo[I], '|'),
        vMemoryStream);
    end;
    Result := vFileInfo.Count;
  finally
    vFileInfo.Free;
    vMemoryStream.Free;
    vFileStream.Free;
  end;
end; { DirectoryDeompression }
///////End Source///////Begin Demo
procedure TForm1.ButtonCompressionClick(Sender: TObject);
begin
  Caption := 'DirectoryCompression:' +
    IntToStr(DirectoryCompression(EditDirectory.Text, EditFileName.Text));
end;procedure TForm1.ButtonDecompressionClick(Sender: TObject);
begin
  Caption := 'DirectoryDecompression:' + 
    IntToStr(DirectoryDecompression(EditDirectory.Text, EditFileName.Text));
end;procedure TForm1.SpeedButtonFileNameClick(Sender: TObject);
begin
  if not OpenDialog1.Execute then Exit;
  EditFileName.Text := OpenDialog1.FileName;
end;procedure TForm1.SpeedButtonDirectoryClick(Sender: TObject);
var
  vDirectory: string;
begin
  vDirectory := EditDirectory.Text;
  if not SelectDirectory('Select', '', vDirectory) then Exit;
  EditDirectory.Text := vDirectory;
end;
///////End Demoend.

Answer 2

zswangII(伴水清清)(职业清洁工) 
  多谢了！还有一个问题能在帮一下吗？怎样用sql中的in子句连接带密码的access数据库？

Answer 3

//try
SELECT [Test].* INTO [C:\Test.mdb;pwd=1234].[test] FROM [Test] 
SELECT * FROM [C:\Test.mdb;pwd=1234].[test]