用一个函数即实现流的压缩和解压,使用方法: ZIP(源流,目标流,True/False)TRUE为压缩,FALSE为解压 函数如下: 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表示压缩级别,可以更改,值是下列参数之一: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 ); //关键代码:写入流 finally if Compress then TCS.Free else TDS.Free; FreeMem(p); end; result:=true; end;
转换成 JPG 格式就可以压缩了
多谢!
ZIP(源流,目标流,True/False)TRUE为压缩,FALSE为解压
函数如下:
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表示压缩级别,可以更改,值是下列参数之一: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 ); //关键代码:写入流
finally
if Compress then TCS.Free else TDS.Free;
FreeMem(p);
end;
result:=true;
end;