d

                        int cishu=0;
                        if((dataLength)%1020!=0)
                            cishu=(dataLength)/1020+1;
                        else
                            cishu=(dataLength)/1020;
                        for(int i=0;i<cishu;i++){
                            if((dataLength-1020)>0){
                                sendBuf[3] = (byte)(1020>>24);//小于1020的表示改帧结束，此次发送的长度是datalength
                                sendBuf[2] = (byte)(1020>>16);
                                sendBuf[1]  = (byte)(1020>>8);
                                sendBuf[0] = (byte)1020;
                            }else if((dataLength-1020)<0)
                            {
                                sendBuf[3] = (byte)(dataLength>>24);//1020表示改帧未结束，此次发出的长度是1020
                                sendBuf[2] = (byte)(dataLength>>16);
                                sendBuf[1]  = (byte)(dataLength>>8);
                                sendBuf[0] = (byte)dataLength;
                            }else{
                                sendBuf[3] = (byte)(1021>>24);//1021表示表示改帧是结束帧，此次发出的长度是1020
                                sendBuf[2] = (byte)(1021>>16);
                                sendBuf[1]  = (byte)(1021>>8);
                                sendBuf[0] = (byte)1021;
                            }
                            if((dataLength-1020)>0)
                            {
                                System.arraycopy(buffer, i*1020, sendBuf, 4, 1020);
                                if(xjtuActivity.cv.sendMessage(sendBuf,1024)==false){
                                    xjtuActivity.messageShow.sendEmptyMessage(6);
                                    break;
                                }
                                dataLength=dataLength-1020;
                            }else{
                                System.arraycopy(buffer,(cishu-1)*1020,sendBuf,4,dataLength);
                                if(xjtuActivity.cv.sendMessage(sendBuf,dataLength+4)==false){
                                    xjtuActivity.messageShow.sendEmptyMessage(6);
                                    break;
                                }
                                dataLength=0;
                            }     
                        }