PERL打印收到的Socket消息
PERL打印收到的Socket消息利用Perl的Select(),sysread()和syswrite()收到的消息将以二进制的形式存储到$buffer中，因此如果直接打印$buffer的内容将得到乱码。要将二进制内容转换为十六进制数串，则必须使用unpack()函数，即：
my $hexstr=unpack("H*",$buffer);
而此时如果打印$hexstr将得到一系列的十六进制数串（数串的长度是接收到的字节数的两倍），仍然难以阅读。因此，有必要将十六进制数串每两个数字进行拆分并加前缀“0x”以便阅读。此时需要借助正则表达式进行模式匹配，方法为:
my @msg=($hexstr =~ m/../g);
其中.用以匹配一个字符。
示例代码如下：
################################################################### DumpMsg## Dump received message in hex mode.## Format: DumpMsg($type, $msglen, $msg);## input: $type= 'MSC' | 'BSC'# $msglen= msg length# $msg= received msg## output: Print received msg to stderr and log in hex type##################################################################sub DumpMsg {my $type=$_;my $msglen=$_;CoolMisc::coolprint("Received message from $type: $msglen bytes/n" );LogPrint("Received message from $type: $msglen bytes/n");# change the received message from bin to hex string.# my @msg=split(/../,unpack("H*", $_),$msglen);my $tmp = unpack("H*", $_);my @msg = ( $tmp =~ m/../g );# print the message to stdout and log file.for(my $i=0;$i<$msglen;$i++) {print "0x$msg[$i] ";syswrite($ROUTELOG,"0x$msg[$i] ");if ($i%8 ==7) {print "/n";syswrite($ROUTELOG,"/n");}}print "/n";syswrite($ROUTELOG,"/n");}
参考文献：
1. Perl Doc-Data::Numbershttp://perl.active-venture.com/pod/perlfaq4-datanumber.html
2. Perl函数pack/unpack:http://hi.baidu.com/xemoaya/blog/item/7ea20008f8d23ed563d98660.html
3.How can I split a string into chunks of two characters each in Perl?
页:
[1]