用一個函數即實現流的壓縮和解壓,使用方法:

Zip(源流,目標流,True/False)TRUE為壓縮,FALSE為解壓

函數如下:

function ZIP(mInputStream: TStream; mOutputStream: TStream;ComPRess:BOOL): BOOL;
var
  I: Integer;
  p:pchar;
  TCS:TCompressionStream;
  TDS:TDecompressionStream;
begin
 result:=false;
  if not (Assigned(mInputStream) and Assigned(mOutputStream)) then Exit;
 try
  if Compress then TCS:=TCompressionStream.Create(clMax,mOutputStream) else TDS:=TDecompressionStream.Create(mOutputStream);//其中的clMax表示壓縮級別,可以更改,值是下列參數之一:clNone, clFastest, clDefault, clMax
  getMem(p,mInputStream.size);
  mInputStream.ReadBuffer(p^,mInputStream.Size );
  if Compress then TCS.WriteBuffer(p^,mInputStream.Size ) else TDS.WriteBuffer(p^,mInputStream.Size );  //關鍵代碼:寫入流
 finally
  if Compress then TCS.Free else TDS.Free;
  FreeMem(p);
 end;
 result:=true;
end;

一定先uses Zlib這個單元,它提供了DELPHI下的壓縮和解壓功能