c++ windows服务，当服务停止时，将停止信息写入日志

在 C++ 中，可以使用 Windows API 来编写 Windows 服务。当服务停止时，可以使用 `ReportEvent()` 函数将停止信息写入 Windows 日志。

下面是一个简单的示例：

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

#define SERVICE_NAME "MyService"

SERVICE_STATUS        g_ServiceStatus = {0};
SERVICE_STATUS_HANDLE g_StatusHandle = NULL;
HANDLE                g_ServiceStopEvent = INVALID_HANDLE_VALUE;

void WriteToLog(const char* pszMessage) {
    HANDLE hEventSource = NULL;
    LPCSTR lpszStrings[2] = {NULL, NULL};

    hEventSource = RegisterEventSource(NULL, SERVICE_NAME);
    if (hEventSource) {
        lpszStrings[0] = SERVICE_NAME;
        lpszStrings[1] = pszMessage;

        ReportEvent(hEventSource,        // event log handle
                    EVENTLOG_INFORMATION_TYPE, // event type
                    0,                   // event category
                    0,                   // event ID
                    NULL,                // current user's SID
                    2,                   // strings in lpszStrings
                    0,                   // no bytes of raw data
                    lpszStrings,         // array of strings
                    NULL);               // no raw data

        DeregisterEventSource(hEventSource);
    }
}

void WINAPI ServiceMain(DWORD argc, LPSTR* argv);
void WINAPI ServiceCtrlHandler(DWORD);
void StartService();
void StopService();

int main(int argc, char* argv[]) {
    SERVICE_TABLE_ENTRY ServiceTable[] = {
        {SERVICE_NAME, (LPSERVICE_MAIN_FUNCTION)ServiceMain},
        {NULL, NULL}
    };

    if (StartServiceCtrlDispatcher(ServiceTable) == FALSE) {
        return GetLastError();
    }

    return 0;
}

void WINAPI ServiceMain(DWORD argc, LPSTR* argv) {
    DWORD Status = E_FAIL;

    g_StatusHandle = RegisterServiceCtrlHandler(SERVICE_NAME, ServiceCtrlHandler);

    if (g_StatusHandle == NULL) {
        return;
    }

    g_ServiceStatus.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
    g_ServiceStatus.dwServiceSpecificExitCode = 0;

    SetServiceStatus(g_StatusHandle, &g_ServiceStatus);

    StartService();

    WaitForSingleObject(g_ServiceStopEvent, INFINITE);

    StopService();

    g_ServiceStatus.dwCurrentState = SERVICE_STOPPED;
    SetServiceStatus(g_StatusHandle, &g_ServiceStatus);
}

void WINAPI ServiceCtrlHandler(DWORD CtrlCode) {
    switch (CtrlCode) {
        case SERVICE_CONTROL_STOP:
            g_ServiceStatus.dwCurrentState = SERVICE_STOP_PENDING;
            SetServiceStatus(g_StatusHandle, &g_ServiceStatus);

            SetEvent(g_ServiceStopEvent);
            break;

        default:
            break;
    }
}

void StartService() {
    g_ServiceStopEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
    if (g_ServiceStopEvent == NULL) {
        WriteToLog("Could not create service stop event.");
        return;
    }

    g_ServiceStatus.dwCurrentState = SERVICE_RUNNING;
    SetServiceStatus(g_StatusHandle, &g_ServiceStatus);

    WriteToLog("MyService started.");
}

void StopService() {
    WriteToLog("MyService stopped.");

    if (g_ServiceStopEvent != NULL) {
        CloseHandle(g_ServiceStopEvent);
        g_ServiceStopEvent = NULL;
    }
}

在上面的例子中，`WriteToLog()` 函数使用 `RegisterEventSource()` 函数注册一个 Windows 日志事件源，并使用 `ReportEvent()` 函数将事件写入日志。在服务停止时，`StopService()` 函数调用 `WriteToLog()` 函数写入停止信息。

注意：在使用 `RegisterEventSource()` 函数注册事件源时，需要管理员权限才能成功。