perl – 为什么我的unpack打印错误的值?
发布时间:2020-12-16 06:15:18 所属栏目:大数据 来源:网络整理
导读:为什么我得到错误的答案/值? 它应该打印的正确值是1,21775,4但是我总是得到1,3,0? my $data = pack ('C*',map hex,split /s+/,"01 00 00 00 7F 08 03 00 21 04 80 04 FF D7 FB 0C EC 01 44 00 61 1D 00 00 10 3B 00 00 FF D7 FB 0C 00 00 8C 64 00 00 EC
为什么我得到错误的答案/值?
它应该打印的正确值是1,21775,4但是我总是得到1,3,0? my $data = pack ('C*',map hex,split /s+/,"01 00 00 00 7F 08 03 00 21 04 80 04 FF D7 FB 0C EC 01 44 00 61 1D 00 00 10 3B 00 00 FF D7 FB 0C 00 00 8C 64 00 00 EC 45"); ($obj->{Version},$obj->{res1},$obj->{EARFCN},$tmp1,$obj->{res2},$tmp2)=unpack("C C3 v C C V",$data); $obj->{band} = ($tmp1 & 0xfc) >> 2; print "n".$obj->{Version}; # Should print 1 print "n".$obj->{EARFCN}; # Should print 2175 print "n".$obj->{band}; # Should print 4. Note: this is the first 6 bits from MSB of $tmp1. print "n"; 解决方法
调试输出:
DB<1> $data = pack ('C*',"01 00 00 00 7F 08 03 00 21 04 80 04 FF D7 FB 0C EC 01 44 00 61 1D 00 00 10 3B 00 00 FF D7 FB 0C 00 00 8C 64 00 00 EC 45") DB<2> x unpack("C C3 v C C V",$data) 0 1 1 0 2 0 3 0 4 2175 5 3 6 0 7 75498529 模式C3输出三个无符号字节,而不是长度为三的字符串. 我想你想要a3.见Perldoc pack() (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |