在Perl中，如何将二进制字符串转换为整数？

Question

I have a four-byte string read from a binary file, which is supposed to represent an integer. How do I dervive the integer?

Example:

my $s = '\xa8e2~';
my $i = stoi($s);
printf "%X", $i;  #gives "0x7e3265a8"

The solution in C is simply:

fread(&i,4,1,fp);

Answer 1

$i = unpack("s", $s)可能有效，但它取决于有符号/无符号和字节顺序，所以你可能会在这里结束： http ： //perldoc.perl.org/perlpacktut.html#Integers

Answer 2

看看unpack功能