存取遠端電腦

您可以使用 Windows 事件記錄檔 API 來存取本機電腦或遠端電腦上的資料。 若要存取遠端電腦上的資料，您必須呼叫 EvtOpenSession 函式 來建立遠端會話內容。 當您呼叫此函式時，您可以指定要連線的遠端電腦名稱稱、用來建立連線的使用者認證，以及用來驗證使用者的驗證類型。 若要指定目前的使用者，請將 [網域]、[使用者] 和 [密碼] 成員設定為 Null。

當您呼叫 Windows 事件記錄檔 API 時，您會將控制碼傳遞至 EvtOpenSession 函式 傳回的遠端會話內容。 (若要存取本機電腦上的資料，請傳遞 Null 以指定預設會話。) 若要存取遠端電腦上的資料，遠端電腦必須啟用「遠端事件記錄檔管理」Windows 防火牆例外狀況;否則，當您嘗試使用會話控制碼時，呼叫將會發生錯誤，並出現RPC_S_SERVER_UNAVAILABLE。 您要連線的電腦必須執行 Windows Vista 或更新版本。

下列範例示範如何連線到遠端電腦。

#include <windows.h>
#include <stdio.h>
#include <winevt.h>

#pragma comment(lib, "wevtapi.lib")

EVT_HANDLE ConnectToRemote(LPWSTR lpwszRemote);
void EnumProviders(EVT_HANDLE hRemote);

void main(void)
{
    EVT_HANDLE hRemote = NULL;
    LPWSTR pwsComputerName = L"<name of the remote computer goes here>";
    

    // Enumerate the registered providers on the local computer.
    wprintf(L"Registered providers on the local computer\n\n");
    EnumProviders(hRemote);

    hRemote = ConnectToRemote(pwsComputerName);
    if (NULL == hRemote)
    {
        wprintf(L"Failed to connect to remote computer. Error code is %d.\n", GetLastError());
        goto cleanup;
    }

    // Enumerate the registered providers on the remote computer.
    // To access a remote computer, the remote computer must enable 
    // Remote Event Log Management as an exception in the firewall;
    // otherwise, the remote call fails with RPC_S_SERVER_UNAVAILABLE.
    wprintf(L"\n\nRegistered providers on the remote computer\n\n");
    EnumProviders(hRemote);

cleanup:

    if (hRemote)
        EvtClose(hRemote);
}

// Create a session conext for the remote computer. Set the 
// Domain, User, and Password member to NULL to specify
// the current user.
EVT_HANDLE ConnectToRemote(LPWSTR lpwszRemote)
{
    EVT_HANDLE hRemote = NULL;
    EVT_RPC_LOGIN Credentials;

    RtlZeroMemory(&Credentials, sizeof(EVT_RPC_LOGIN));
    Credentials.Server = lpwszRemote;
    Credentials.Domain = NULL; 
    Credentials.User = NULL; 
    Credentials.Password = NULL; 
    Credentials.Flags = EvtRpcLoginAuthNegotiate; 

    // This call creates a remote session context; it does not actually
    // create a connection to the remote computer. The connection to
    // the remote computer happens when you use the context.
    hRemote = EvtOpenSession(EvtRpcLogin, &Credentials, 0, 0);

    SecureZeroMemory(&Credentials, sizeof(EVT_RPC_LOGIN));

    return hRemote;
}

// Enumerate the registered providers on the computer.
void EnumProviders(EVT_HANDLE hRemote)
{
    EVT_HANDLE hPublishers = NULL;
    WCHAR wszPublisherName[255 + 1];
    DWORD dwBufferUsed = 0;
    DWORD status = ERROR_SUCCESS;

    hPublishers = EvtOpenPublisherEnum(hRemote, 0);
    if (NULL == hPublishers)
    {
        wprintf(L"EvtOpenPublisherEnum failed with %d\n", GetLastError());
        goto cleanup;
    }

    while (true)
    {
        if (EvtNextPublisherId(hPublishers, sizeof(wszPublisherName)/sizeof(WCHAR), wszPublisherName, &dwBufferUsed))
        {
            wprintf(L"%s\n", wszPublisherName);
        }
        else
        {
            status = GetLastError();
            if (ERROR_NO_MORE_ITEMS == status)
            {
                break;
            }
            else
            {
                wprintf(L"EvtNextPublisherId failed with 0x%ud\n", GetLastError());
            }
        }
    }

cleanup:

    if (hPublishers)
        EvtClose(hPublishers);
}