[C++知识库]Windows C++服务调用其他程序

参考：Simple Windows Service in C++

代码

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

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

VOID WINAPI ServiceMain(DWORD argc, LPTSTR *argv);
VOID WINAPI ServiceCtrlHandler(DWORD);
DWORD WINAPI ServiceWorkerThread(LPVOID lpParam);

#undef _T
#define _T (LPCSTR)
#define SERVICE_NAME _T("My Sample Service")

int _tmain(int argc, TCHAR *argv[])
{
    SERVICE_TABLE_ENTRY ServiceTable[] =
        {
            {(LPSTR) "My Sample Service", (LPSERVICE_MAIN_FUNCTION)ServiceMain},
            {NULL, NULL}};

    if (StartServiceCtrlDispatcher(ServiceTable) == FALSE)
    {
        return GetLastError();
    }
    return 0;
}

VOID WINAPI ServiceMain(DWORD argc, LPTSTR *argv)
{
    DWORD Status = E_FAIL;

    // Register our service control handler with the SCM
    g_StatusHandle = RegisterServiceCtrlHandler(SERVICE_NAME, ServiceCtrlHandler);

    if (g_StatusHandle == NULL)
    {
        return;
    }

    // Tell the service controller we are starting
    ZeroMemory(&g_ServiceStatus, sizeof(g_ServiceStatus));
    g_ServiceStatus.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
    g_ServiceStatus.dwControlsAccepted = 0;
    g_ServiceStatus.dwCurrentState = SERVICE_START_PENDING;
    g_ServiceStatus.dwWin32ExitCode = 0;
    g_ServiceStatus.dwServiceSpecificExitCode = 0;
    g_ServiceStatus.dwCheckPoint = 0;

    if (SetServiceStatus(g_StatusHandle, &g_ServiceStatus) == FALSE)
    {
        OutputDebugString(_T(
          "My Sample Service: ServiceMain: SetServiceStatus returned error"));
    }

    /*
     * Perform tasks necessary to start the service here
     */

    // Create a service stop event to wait on later
    g_ServiceStopEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
    if (g_ServiceStopEvent == NULL)
    {
        // Error creating event
        // Tell service controller we are stopped and exit
        g_ServiceStatus.dwControlsAccepted = 0;
        g_ServiceStatus.dwCurrentState = SERVICE_STOPPED;
        g_ServiceStatus.dwWin32ExitCode = GetLastError();
        g_ServiceStatus.dwCheckPoint = 1;

        if (SetServiceStatus(g_StatusHandle, &g_ServiceStatus) == FALSE)
        {
            OutputDebugString(_T(
	      "My Sample Service: ServiceMain: SetServiceStatus returned error"));
        }
        return;
    }

    // Tell the service controller we are started
    g_ServiceStatus.dwControlsAccepted = SERVICE_ACCEPT_STOP;
    g_ServiceStatus.dwCurrentState = SERVICE_RUNNING;
    g_ServiceStatus.dwWin32ExitCode = 0;
    g_ServiceStatus.dwCheckPoint = 0;

    if (SetServiceStatus(g_StatusHandle, &g_ServiceStatus) == FALSE)
    {
        OutputDebugString(_T(
          "My Sample Service: ServiceMain: SetServiceStatus returned error"));
    }

    // Start a thread that will perform the main task of the service
    HANDLE hThread = CreateThread(NULL, 0, ServiceWorkerThread, NULL, 0, NULL);

    // Wait until our worker thread exits signaling that the service needs to stop
    WaitForSingleObject(hThread, INFINITE);

    /*
     * Perform any cleanup tasks 
     */

    CloseHandle(g_ServiceStopEvent);

    // Tell the service controller we are stopped
    g_ServiceStatus.dwControlsAccepted = 0;
    g_ServiceStatus.dwCurrentState = SERVICE_STOPPED;
    g_ServiceStatus.dwWin32ExitCode = 0;
    g_ServiceStatus.dwCheckPoint = 3;

    if (SetServiceStatus(g_StatusHandle, &g_ServiceStatus) == FALSE)
    {
        OutputDebugString(_T(
          "My Sample Service: ServiceMain: SetServiceStatus returned error"));
    }
}

VOID WINAPI ServiceCtrlHandler(DWORD CtrlCode)
{
    switch (CtrlCode)
    {
    case SERVICE_CONTROL_STOP:

        if (g_ServiceStatus.dwCurrentState != SERVICE_RUNNING)
            break;

        /* 
         * Perform tasks necessary to stop the service here 
         */

        g_ServiceStatus.dwControlsAccepted = 0;
        g_ServiceStatus.dwCurrentState = SERVICE_STOP_PENDING;
        g_ServiceStatus.dwWin32ExitCode = 0;
        g_ServiceStatus.dwCheckPoint = 4;

        if (SetServiceStatus(g_StatusHandle, &g_ServiceStatus) == FALSE)
        {
            OutputDebugString(_T(
              "My Sample Service: ServiceCtrlHandler: SetServiceStatus returned error"));
        }

        // This will signal the worker thread to start shutting down
        SetEvent(g_ServiceStopEvent);

        break;

    default:
        break;
    }
}

VOID startup(LPCTSTR lpApplicationName)
{
    // additional information
    STARTUPINFO si;
    PROCESS_INFORMATION pi;

    // set the size of the structures
    ZeroMemory(&si, sizeof(si));
    si.cb = sizeof(si);
    ZeroMemory(&pi, sizeof(pi));

    // start the program up
    CreateProcess(lpApplicationName, // the path
                  NULL,              // Command line
                  NULL,              // Process handle not inheritable
                  NULL,              // Thread handle not inheritable
                  FALSE,             // Set handle inheritance to FALSE
                  0,                 // No creation flags
                  NULL,              // Use parent's environment block
                  NULL,              // Use parent's starting directory
                  &si,               // Pointer to STARTUPINFO structure
                  &pi                // Pointer to PROCESS_INFORMATION structure (removed extra parentheses)
    );
    // Close process and thread handles.
    CloseHandle(pi.hProcess);
    CloseHandle(pi.hThread);
}

DWORD WINAPI ServiceWorkerThread(LPVOID lpParam)
{
    int c = 0;
    //  Periodically check if the service has been requested to stop
    while (WaitForSingleObject(g_ServiceStopEvent, 0) != WAIT_OBJECT_0)
    {
        /*
         * Perform main service function here
         */

        //  Simulate some work by sleeping
        Sleep(1000);
        c += 1;
        if (c == 5)
        {
            c = 0;
            startup("D:\\code\\cpp\\help1\\hello.bat");
        }
    }

    return ERROR_SUCCESS;
}

bat脚本内容：

chcp 65001
@echo OFF
echo %date% %time%>> "D:\\code\\cpp\\help1\\log.txt"

代码中的路径按实际情况进行修改。

测试

编译（MinGW）：

gcc service.c -o service.exe

注册系统服务：
（打开具有管理员权限的CMD）

sc create "My Service" binPath= D:\code\cpp\help1\service.exe

打开系统服务菜单（services.msc），启动服务。可以看到D:\code\cpp\help1\log.txt写入以下内容：

周二 2021/07/27 22:11:53.39
周二 2021/07/27 22:11:58.40
周二 2021/07/27 22:12:03.47
周二 2021/07/27 22:12:08.52
周二 2021/07/27 22:12:13.59
周二 2021/07/27 22:12:18.61
周二 2021/07/27 22:12:23.70

停止服务后，则文件不再更新。

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