EnumerateTraceGuidsEx 函数 (evntrace.h)

项目
08/23/2023

检索有关计算机上当前运行的事件跟踪提供程序的信息。

语法

ULONG WMIAPI EnumerateTraceGuidsEx(
  [in]  TRACE_QUERY_INFO_CLASS TraceQueryInfoClass,
  [in]  PVOID                  InBuffer,
  [in]  ULONG                  InBufferSize,
  [out] PVOID                  OutBuffer,
  [in]  ULONG                  OutBufferSize,
  [out] PULONG                 ReturnLength
);

参数

[in] TraceQueryInfoClass

确定要返回的信息类型。有关可能的值，请参阅 TRACE_QUERY_INFO_CLASS 枚举。

[in] InBuffer

要检索其信息的提供程序或提供程序组的 GUID。仅当 TraceQueryInfoClass 为 TraceGuidQueryInfo 或 TraceGroupQueryInfo 时指定 GUID。

[in] InBufferSize

数据 InBuffer 的大小（以字节为单位）。

[out] OutBuffer

包含枚举信息的应用程序分配的缓冲区。信息的格式取决于 TraceQueryInfoClass 的值。

[in] OutBufferSize

OutBuffer 缓冲区的大小（以字节为单位）。如果函数成功， 则 ReturnLength 参数将接收所用缓冲区的大小。如果缓冲区太小，则函数返回 ERROR_INSUFFICIENT_BUFFER ， ReturnLength 参数接收所需的缓冲区大小。如果输入上的缓冲区大小为零，则缓冲区中不会返回任何数据， 并且 ReturnLength 参数将接收所需的缓冲区大小。

[out] ReturnLength

OutBuffer 中的数据的实际大小（以字节为单位）。

返回值

如果函数成功，则返回值为 ERROR_SUCCESS。

如果函数失败，则返回值为系统错误代码之一。下面是一些常见错误及其原因。

ERROR_INVALID_PARAMETER

其中一个参数无效。
ERROR_INSUFFICIENT_BUFFER

OutBuffer 缓冲区太小，无法接收所有已注册提供程序的信息。使用 ReturnLength 中返回的大小重新分配缓冲区。

注解

此函数返回有关已通过 RegisterTraceGuids 或 EventRegister) (启动但尚未停止的事件跟踪提供程序的信息。

注意

若要获取有关已在系统上注册的提供程序清单的信息， (即通过 wevtutil) 注册的清单，请使用 TdhEnumerateProviders。

如果 TraceQueryInfoClass 是 TraceGuidQueryInfo，则 ETW 返回 TRACE_GUID_INFO 块中的数据，该块是信息的标头。信息块包含使用同一 GUID 的每个提供程序的TRACE_PROVIDER_INSTANCE_INFO 块。每个实例信息块都包含启用提供程序的每个会话的 TRACE_ENABLE_INFO 结构。

示例

以下示例演示如何调用此函数。

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

DWORD GetProviderInfo(GUID ProviderGuid, PTRACE_GUID_INFO& pInfo);

int wmain(void)
{
    ULONG status = ERROR_SUCCESS;
    GUID* pTemp = NULL;
    GUID* pGuids = NULL;
    DWORD GuidListSize = 0;
    DWORD GuidCount = 0;
    DWORD RequiredListSize = 0;
    WCHAR ProviderGuid[50];
    PTRACE_GUID_INFO pInfo = NULL;
    PTRACE_PROVIDER_INSTANCE_INFO pInstance = NULL;
    PTRACE_ENABLE_INFO pEnable = NULL;


    // Get the required buffer size for the query.

    status = EnumerateTraceGuidsEx(TraceGuidQueryList, NULL, 0, pGuids, GuidListSize, &RequiredListSize);

    // The number of registered providers could change between the
    // time you called to get the buffer size and the time you called
    // to get the actual data, so call EnumerateTraceGuidsEx in a loop
    // until you no longer get ERROR_INSUFFICIENT_BUFFER.

    while (ERROR_INSUFFICIENT_BUFFER == status)
    {
        pTemp = (GUID*)realloc(pGuids, RequiredListSize);

        if (NULL == pTemp)
        {
            printf("Error allocating memory for list of provider GUIDs.\n");
            goto cleanup;
        }

        pGuids = pTemp;
        pTemp = NULL;

        GuidListSize = RequiredListSize;

        ZeroMemory(pGuids, GuidListSize);

        status = EnumerateTraceGuidsEx(TraceGuidQueryList, NULL, 0, pGuids, GuidListSize, &RequiredListSize);
    }

    if (ERROR_SUCCESS == status)
    {
        GuidCount = GuidListSize / sizeof(GUID);

        // For each registered provider on the computer, get information
        // about how it was registered. If a session enabled the
        // provider, get information on how the session enabled the provider.

        for (USHORT i = 0; i < GuidCount; i++)
        {
            StringFromGUID2(pGuids[i], ProviderGuid, sizeof(ProviderGuid));

            printf("Provider: %ls\n", ProviderGuid);

            status = GetProviderInfo(pGuids[i], pInfo);

            if (ERROR_SUCCESS == status)
            {
                pInstance = (PTRACE_PROVIDER_INSTANCE_INFO)((PBYTE)pInfo + sizeof(TRACE_GUID_INFO));

                if (pInfo->InstanceCount > 1)
                {
                    printf("There are %d providers that use the same GUID.\n", pInfo->InstanceCount);
                }

                for (DWORD j = 0; j < pInfo->InstanceCount; j++)
                {
                    printf("\tThe PID of the process that registered the provider is %lu.\n", pInstance->Pid);

                    if ((pInstance->Flags & TRACE_PROVIDER_FLAG_PRE_ENABLE) == TRACE_PROVIDER_FLAG_PRE_ENABLE)
                    {
                        printf("\tThe provider is not registered; however, one or more sessions have enabled the provider.\n");
                    }
                    else
                    {
                        if ((pInstance->Flags & TRACE_PROVIDER_FLAG_LEGACY) == TRACE_PROVIDER_FLAG_LEGACY)
                        {
                            printf("\tThe provider used RegisterTraceGuids to register itself.\n");
                        }
                        else
                        {
                            printf("\tThe provider used EventRegister to register itself.\n");
                        }
                    }

                    if (pInstance->EnableCount > 0)
                    {
                        printf("\tThe provider is enabled to the following sessions.\n");

                        pEnable = (PTRACE_ENABLE_INFO)((PBYTE)pInstance + sizeof(TRACE_PROVIDER_INSTANCE_INFO));

                        for (DWORD k = 0; k < pInstance->EnableCount; k++)
                        {
                            printf("\t\tSession Id: %hu\n", pEnable->LoggerId);
                            printf("\t\tLevel used to enable the provider: %hu\n", pEnable->Level);
                            printf("\t\tMatchAnyKeyword value used to enable the provider: %I64u\n", pEnable->MatchAnyKeyword);
                            printf("\t\tMatchAllKeyword value used to enable the provider: %I64u\n", pEnable->MatchAllKeyword);

                            if (pEnable->EnableProperty > 0)
                            {
                                printf("\t\tThe session requested that the following information be included with each event:\n");

                                if ((pEnable->EnableProperty & EVENT_ENABLE_PROPERTY_SID) == EVENT_ENABLE_PROPERTY_SID)
                                {
                                    printf("\t\t\tThe SID of the user that logged the event\n");
                                }

                                if ((pEnable->EnableProperty & EVENT_ENABLE_PROPERTY_TS_ID) == EVENT_ENABLE_PROPERTY_TS_ID)
                                {
                                    printf("\t\t\tThe terminal session ID\n");
                                }
                            }

                            pEnable++;

                            printf("\n");
                        }
                    }

                    pInstance = (PTRACE_PROVIDER_INSTANCE_INFO)((PBYTE)pInstance + pInstance->NextOffset);

                    printf("\n");
                }

                printf("\n");
            }
            else
            {
                printf("Error retrieving provider info (%lu)\n\n", status);
            }
        }

        printf("\nRegistered provider count is %lu.\n", GuidCount);
    }
    else
    {
        printf("EnumerateTraceGuidsEx(TraceGuidQueryList) failed with %lu.\n", status);
        goto cleanup;
    }

cleanup:

    if (pGuids)
    {
        free(pGuids);
        pGuids = NULL;
    }

    if (pInfo)
    {
        free(pInfo);
        pInfo = NULL;
    }

    return 0;
}


// Get information about the specified provider.

DWORD GetProviderInfo(GUID ProviderGuid, PTRACE_GUID_INFO& pInfo)
{
    ULONG status = ERROR_SUCCESS;
    PTRACE_GUID_INFO pTemp = NULL;
    DWORD InfoListSize = 0;
    DWORD RequiredListSize = 0;

    status = EnumerateTraceGuidsEx(TraceGuidQueryInfo, &ProviderGuid, sizeof(GUID), pInfo, InfoListSize, &RequiredListSize);

    while (ERROR_INSUFFICIENT_BUFFER == status)
    {
        pTemp = (PTRACE_GUID_INFO)realloc(pInfo, RequiredListSize);

        if (NULL == pTemp)
        {
            printf("Error allocating memory for provider info.\n");
            goto cleanup;
        }

        pInfo = pTemp;
        pTemp = NULL;

        InfoListSize = RequiredListSize;

        ZeroMemory(pInfo, InfoListSize);

        status = EnumerateTraceGuidsEx(TraceGuidQueryInfo, &ProviderGuid, sizeof(GUID), pInfo, InfoListSize, &RequiredListSize);
    }

    if (ERROR_SUCCESS != status)
    {
        printf("EnumerateTraceGuidsEx(TraceGuidQueryInfo) failed with %lu.\n", status);
    }

cleanup:

    return status;
}

要求

要求	值
最低受支持的客户端	Windows Vista [桌面应用 \| UWP 应用]
最低受支持的服务器	Windows Server 2008 [桌面应用 \| UWP 应用]
目标平台	Windows
标头	evntrace.h
Library	Advapi32.lib
DLL	Advapi32.dll

另请参阅

TRACE_QUERY_INFO_CLASS

EnumerateTraceGuidsEx 函数 (evntrace.h)

语法

参数

返回值

注解

示例

要求

另请参阅

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