下面这段C++代码什么意思 新手求教

[xzh1995]

typedef
BOOL
(PASCAL FAR * LPFN_TRANSMITPACKETS) (
    SOCKET hSocket,                             
    LPTRANSMIT_PACKETS_ELEMENT lpPacketArray,                               
    DWORD nElementCount,                
    DWORD nSendSize,                
    LPOVERLAPPED lpOverlapped,                  
    DWORD dwFlags                               
    );

[橡木疙瘩]

定义一个函数指针类型的类型别名LPFN_TRANSMITPACKETS

[橡木疙瘩]

BOOL PASCAL FAR my_func1 (
    SOCKET hSocket,                             
    LPTRANSMIT_PACKETS_ELEMENT lpPacketArray,                               
    DWORD nElementCount,                
    DWORD nSendSize,                
    LPOVERLAPPED lpOverlapped,                  
    DWORD dwFlags                               
    );
BOOL PASCAL FAR my_func2 (
    SOCKET hSocket,                             
    LPTRANSMIT_PACKETS_ELEMENT lpPacketArray,                               
    DWORD nElementCount,                
    DWORD nSendSize,                
    LPOVERLAPPED lpOverlapped,                  
    DWORD dwFlags                               
    );

    LPFN_TRANSMITPACKETS call_back;
    call_back = &my_func1;
    call_back( .....);//这时相当于调用my_func1
    call_back = &my_func2;
    call_back( .....);//这时相当于调用my_func2

[苏客达]

定义一个LPFN_TRANSMITPACKETS函数指针类型。 LPFN_TRANSMITPACKETS fn; fn指向一个函数的入口地址。函数的返回类型是 FAR *， 参数表是( SOCKET hSocket, LPTRANSMIT_PACKETS_ELEMENT lpPacketArray, DWORD nElementCount, DWORD nSendSize, LPOVERLAPPED lpOverlapped, DWORD dwFlags );