消息问题

Question

一般消息发过来我们怎么来区分消息那些的数据那些是命令?

Answer 1

数据一般放在wParam和lParam里，消息放在Msg参数里

Answer 2

数据放在wParam和lParam
消息Msg结构内

Answer 3

问个弱弱的问题
WParam是什么?

Answer 4

数据放在wParam和lParam 而消息存在Msg结构内

Answer 5

typedef struct _ipHeader
{
UCHAR VersionHLen;
UCHAR TOS;
USHORT Length;
USHORT Ident;
USHORT FlagsOffset;
UCHAR TTL;
UCHAR Protocol;
USHORT CheckSum;
UINT SrcAddr;
UINT DesAddr;
}IpHeader,*PIpHeader;这个是IP首部的定义，这些是必须有的
接在这个后面就是数据
比如传输层传下来的TCP报文

Answer 6

    ----------------------------------------------
    | ip header | tcp header(or x header) | data | 
    ----------------------------------------------    IP header structure:
             4        8        16                                       32 bit
    |--------|--------|----------------|--------------------------------|
    |  Ver   |  IHL   |Type of service |          Total length          | 
    |--------|--------|----------------|--------------------------------|
    | Identification  |      Flags     |         Fragment offset        |
    |--------|--------|----------------|--------------------------------|
    |  Time to live   |    Protocol    |         Header checksum        | 
    |--------|--------|----------------|--------------------------------|
    |                         Source address                            | 
    |--------|--------|----------------|--------------------------------|
    |                       Destination address                         | 
    |--------|--------|----------------|--------------------------------|
    |                        Option + Padding                           | 
    |--------|--------|----------------|--------------------------------|
    |                                Data                               |
    |--------|--------|----------------|--------------------------------|    TCP header structure:
                                    16                                32 bit
    |--------------------------------|--------------------------------|
    |          Source port           |        Destination port        | 
    |--------------------------------|--------------------------------|
    |                         Sequence number                         |
    |--------------------------------|--------------------------------|
    |                      Acknowledgement number                     | 
    |--------------------------------|--------------------------------|
    |  Offset  | Resrvd  |U|A|P|R|S|F|            Window              | 
    |--------------------------------|--------------------------------|
    |           Checksum             |        Urgent pointer          | 
    |--------------------------------|--------------------------------|
    |                         Option + Padding                        | 
    |--------------------------------|--------------------------------|
    |                              Data                               |
    |--------------------------------|--------------------------------|