MIB_TCPTABLE2 結構 (tcpmib.h)

發行項
03/08/2023

MIB_TCPTABLE2結構包含本機電腦上的 IPv4 TCP 連線資料表。

語法

typedef struct _MIB_TCPTABLE2 {
  DWORD       dwNumEntries;
  MIB_TCPROW2 table[ANY_SIZE];
} MIB_TCPTABLE2, *PMIB_TCPTABLE2;

成員

dwNumEntries

資料表中的專案數。

table[ANY_SIZE]

實作為 MIB_TCPROW2 結構陣列之 TCP 連線資料表的指標。

備註

GetTcpTable2函式會擷取本機電腦上的 IPv4 TCP 連線資料表，並在MIB_TCPTABLE2結構中傳回這項資訊。 MIB_TCPROW2結構的陣列包含在MIB_TCPTABLE2結構中。

MIB_TCPTABLE2結構可能包含dwNumEntries成員與資料表成員中第一個MIB_TCPROW2陣列專案之間的對齊填補。表格成員中MIB_TCPROW2陣列專案之間也可能有對齊的填補。任何對 MIB_TCPROW2 陣列專案的存取都應該假設填補可能存在。

範例

下列範例會擷取 IPv4 的 TCP 連接資料表做為 MIB_TCPTABLE2 結構，列印以 MIB_TCPROW2 結構表示的每個線上狀態。

#include <winsock2.h>
#include <ws2tcpip.h>
#include <iphlpapi.h>
#include <stdio.h>

// Need to link with Iphlpapi.lib and Ws2_32.lib
#pragma comment(lib, "iphlpapi.lib")
#pragma comment(lib, "ws2_32.lib")

#define MALLOC(x) HeapAlloc(GetProcessHeap(), 0, (x))
#define FREE(x) HeapFree(GetProcessHeap(), 0, (x))
/* Note: could also use malloc() and free() */

int main()
{

    // Declare and initialize variables
    PMIB_TCPTABLE2 pTcpTable;
    ULONG ulSize = 0;
    DWORD dwRetVal = 0;

    char szLocalAddr[128];
    char szRemoteAddr[128];

    struct in_addr IpAddr;

    int i;

    pTcpTable = (MIB_TCPTABLE2 *) MALLOC(sizeof (MIB_TCPTABLE2));
    if (pTcpTable == NULL) {
        printf("Error allocating memory\n");
        return 1;
    }

    ulSize = sizeof (MIB_TCPTABLE);
// Make an initial call to GetTcpTable2 to
// get the necessary size into the ulSize variable
    if ((dwRetVal = GetTcpTable2(pTcpTable, &ulSize, TRUE)) ==
        ERROR_INSUFFICIENT_BUFFER) {
        FREE(pTcpTable);
        pTcpTable = (MIB_TCPTABLE2 *) MALLOC(ulSize);
        if (pTcpTable == NULL) {
            printf("Error allocating memory\n");
            return 1;
        }
    }
// Make a second call to GetTcpTable2 to get
// the actual data we require
    if ((dwRetVal = GetTcpTable2(pTcpTable, &ulSize, TRUE)) == NO_ERROR) {
        printf("\tNumber of entries: %d\n", (int) pTcpTable->dwNumEntries);
        for (i = 0; i < (int) pTcpTable->dwNumEntries; i++) {
            printf("\n\tTCP[%d] State: %ld - ", i,
                   pTcpTable->table[i].dwState);
            switch (pTcpTable->table[i].dwState) {
            case MIB_TCP_STATE_CLOSED:
                printf("CLOSED\n");
                break;
            case MIB_TCP_STATE_LISTEN:
                printf("LISTEN\n");
                break;
            case MIB_TCP_STATE_SYN_SENT:
                printf("SYN-SENT\n");
                break;
            case MIB_TCP_STATE_SYN_RCVD:
                printf("SYN-RECEIVED\n");
                break;
            case MIB_TCP_STATE_ESTAB:
                printf("ESTABLISHED\n");
                break;
            case MIB_TCP_STATE_FIN_WAIT1:
                printf("FIN-WAIT-1\n");
                break;
            case MIB_TCP_STATE_FIN_WAIT2:
                printf("FIN-WAIT-2 \n");
                break;
            case MIB_TCP_STATE_CLOSE_WAIT:
                printf("CLOSE-WAIT\n");
                break;
            case MIB_TCP_STATE_CLOSING:
                printf("CLOSING\n");
                break;
            case MIB_TCP_STATE_LAST_ACK:
                printf("LAST-ACK\n");
                break;
            case MIB_TCP_STATE_TIME_WAIT:
                printf("TIME-WAIT\n");
                break;
            case MIB_TCP_STATE_DELETE_TCB:
                printf("DELETE-TCB\n");
                break;
            default:
                wprintf(L"UNKNOWN dwState value: %d\n", pTcpTable->table[i].dwState);
                break;
            }

            IpAddr.S_un.S_addr = (u_long) pTcpTable->table[i].dwLocalAddr;
            strcpy_s(szLocalAddr, sizeof (szLocalAddr), inet_ntoa(IpAddr));
            printf("\tTCP[%d] Local Addr: %s\n", i, szLocalAddr);

            printf("\tTCP[%d] Local Port: %d \n", i,
                   ntohs((u_short)pTcpTable->table[i].dwLocalPort));

            IpAddr.S_un.S_addr = (u_long) pTcpTable->table[i].dwRemoteAddr;
            strcpy_s(szRemoteAddr, sizeof (szRemoteAddr), inet_ntoa(IpAddr));
            printf("\tTCP[%d] Remote Addr: %s\n", i, szRemoteAddr);

            printf("\tTCP[%d] Remote Port: %d\n", i,
                   ntohs((u_short)pTcpTable->table[i].dwRemotePort));
                   
            printf("\tTCP[%d] Owning PID: %d\n", i, pTcpTable->table[i].dwOwningPid);

            printf("\tTCP[%d] Offload State: %ld - ", i,
                   pTcpTable->table[i].dwOffloadState);
            switch (pTcpTable->table[i].dwOffloadState) {
            case TcpConnectionOffloadStateInHost:
                printf("Owned by the network stack and not offloaded \n");
                break;
            case TcpConnectionOffloadStateOffloading:
                printf("In the process of being offloaded\n");
                break;
            case TcpConnectionOffloadStateOffloaded:
                printf("Offloaded to the network interface control\n");
                break;
            case TcpConnectionOffloadStateUploading:
                printf("In the process of being uploaded back to the network stack \n");
                break;
            default:
                printf("UNKNOWN Offload state value\n");
                break;
            }
                   
        }
    } else {
        printf("\tGetTcpTable2 failed with %d\n", dwRetVal);
        FREE(pTcpTable);
        return 1;
    }

    if (pTcpTable != NULL) {
        FREE(pTcpTable);
        pTcpTable = NULL;
    }

    return 0;    
}

需求


最低支援的用戶端	Windows Vista [僅限傳統型應用程式]
最低支援的伺服器	Windows Server 2008 [僅限傳統型應用程式]
標頭	tcpmib.h (包含 Iphlpapi.h)