服务器是小端模式, 发送过来前8个字节是 unsigned long long 类型的数据, 我怎么用unpack来读出来呢?
unpack("Q8md5/a10end_str", $recv_body); 这个不行 多谢
回复讨论(解决方案)
拆开两个32位unpack,反正是整型,又不是浮点
直接返回还要看系统会否溢出呢
另外你上面写的都不符合unpack语法
啊 那怎么写呢 能帮我写出来试一下么 多谢
Code Description
a NUL-padded string
A SPACE-padded string
h Hex string, low nibble first
H Hex string, high nibble first
c signed char
C unsigned char
s signed short (always 16 bit, machine byte order)
S unsigned short (always 16 bit, machine byte order)
n unsigned short (always 16 bit, big endian byte order)
v unsigned short (always 16 bit, little endian byte order)
i signed integer (machine dependent size and byte order)
I unsigned integer (machine dependent size and byte order)
l signed long (always 32 bit, machine byte order)
L unsigned long (always 32 bit, machine byte order)
N unsigned long (always 32 bit, big endian byte order)
V unsigned long (always 32 bit, little endian byte order)
f float (machine dependent size and representation)
d double (machine dependent size and representation)
x NUL byte
X Back up one byte
@ NUL-fill to absolute position
没有 Q
那我那个该怎么写呢 能帮我改 一下么? 谢谢
我来猜猜你想干什么
unpack("Q8md5/a10end_str", $recv_body)
应写作
unpack("Qmd5/a10end_str", $recv_body)
虽然32位的php不支持64位整数,但规则还是要的
Q8 表示 8 个64位整数,显然是不合题意的
既然是命名为 md5,那么也可以不作为整数来看待
$a = unpack("amd5/a10end_str", $recv_body);
$a['md5'] 不就是你要的结果吗
不对, amd5只是解出了头一个字节...
这个md5是我自己随便写的, 实际是一个 unsigned long long的数值, 这个类型的数值该怎么解出来呢?
你最好贴出 base64_encode($recv_body) 的结果
有了样例数据才好讨论
??????ALLDATAEND
前8个字节是个8位数字, 后面是文本ALLDATAEND;
unpack("Nn1/a10end_str", $recv_body);
用这个解, n1是负数 -1935870548
正确的应该是441051427183631500才对
你
echo base64_encode($recv_body);
贴出结果
用了原始数据,我才能准确的告诉你该怎么写
recv_body is ====>jJz1rO/tHgZBTExEQVRBRU5E
是这个 麻烦了
$s = base64_decode('jJz1rO/tHgZBTExEQVRBRU5E');$t = unpack('a8n/a10end_str', $s);$t['n'] = rmul($t['n']);print_r($t);function rmul($w) { $n = 0; foreach(array_reverse(unpack('v4', $w)) as $v) $n = bcadd(bcmul($n, 65536), $v); return $n;}Array
(
[n] => 441051427183631500
[end_str] => ALLDATAEND
)
非常感谢 好复杂呀 呵呵 unpack本身不能解码这么长的数字么?
php 都是是 32 位编译器编译的,所以没法处理 64 位的整数
如果你用 64 位编译器编译时,就可支持 64 位整数了
当然 Q 和 q 模式也就可以用了,也就简单了
好的 多谢了 呵呵

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