java调用c程序通信示例代码

//===============Client Struct================
#pragma pack(push,4)

#define LOG_SEND 0
#define MSG_SEND 1
#define EXIT_SEND 2
#define BUFFER_MAX_SIZE 512
#define HEADER_LEN  sizeof(Header)
typedef struct HeaderStruct
{
 int OP;//OP : 0--> Login  1--> SendMsg  2--> Exit
 int size;
}Header;

//#define LOG_INFO_TIME_OFFSET   (sizeof(Log) - 2 * sizeof(char *))
#define LOG_INFO_TIME_OFFSET  (sizeof(Log) - 2 * sizeof(int))//Modify 2009年7月15日15:15:14
#define LOG_INFO_USERNAME_OFFSET(pLog)   (LOG_INFO_TIME_OFFSET + pLog->timeLen* 2 )
typedef struct LogStruct
{
 int timeLen;
 int userNameLen;
 char* time;
 char* userName; 
}Log;
//#define SENDMSG_INFO_USERNAME_OFFSET   (sizeof(SendMsg) - 3 * sizeof(char *))
#define SENDMSG_INFO_USERNAME_OFFSET  (sizeof(SendMsg) - 3 * sizeof(int))
#define SENDMSG_INFO_SENDMSG_OFFSET(pSendMsg)   (SENDMSG_INFO_USERNAME_OFFSET + pSendMsg->userNameLen * 2)
#define SENDMSG_INFO_TIME_OFFSET(pSendMsg)   (SENDMSG_INFO_SENDMSG_OFFSET(pSendMsg) + pSendMsg->sendMsgLen * 2)
typedef struct SendMsgStruct
{
 int userNameLen;
 int sendMsgLen;
 int timeLen;
 char* userName;
 char* sendMsg;
 char* time;
}SendMsg;
#pragma pack(pop)