<div class="codebody" id="code56110">
var
mss:TMemoryStream;
zip:TDeCompressionStream;
zip1:TCompressionStream;
fs:TFileStream;
fBuf:Array[0..16383]ofByte;
flen:Integer;
//从数据库中取出图片
//...写出sql语句以取得有图片的记录，此处从略
mss:=TMemoryStream.Create;
fs:=TFileStream.Create('filename.jpg',fmCreateorfmOpenWrite);
try
TBlobField(Que.FieldByName('pic')).SaveToStream(mss);
zip:=TDeCompressionStream.Create(fs);
try
flen:=zip.Read(fbuf,SizeOf(fBuf));
whileflen>0dobegin
fs.Write(fbuf,flen);
flen:=zip.Read(fbuf,SizeOf(fBuf));
end;
finally
FreeAndNil(zip);
end;
finally
mss.Free;
fs.Free;
end;
//将文件filename.jpg中的图片保存到数据库
//...写出sql语句，打开Que，并定位到要保存图片的记录，此处从略
fs:=TFileStream.Create('filename.jpg',fmOpenRead);
mss:=TMemoryStream.Create;
try
zip1:=TCompressionStream.Create(clDefault,mss);
try
flen:=fs.Read(fbuf,SizeOf(fBuf));
whileflen>0dobegin
zip1.Write(fbuf,flen);
flen:=fs.Read(fbuf,SizeOf(fBuf));
end;
//保存到数据库
TBlobField(Que.FieldByName('pic')).LoadFromStream(mss);
Que.UpdateBatch();
//...
finally
zip1.Free;
end;
finally
fs.Free;
mss.Free;
end;