c++代码实现Windows后台服务，定时监控多个进程，重启并且能打开界面

以下是一个简单的 Windows 后台服务，它会定时监控指定进程，并在进程关闭时重新启动它们。同时，该服务可以打开指定进程的界面。

#include <Windows.h>
#include <tchar.h>

#define SERVICE_NAME _T("MyService")

SERVICE_STATUS          g_ServiceStatus = { 0 };
SERVICE_STATUS_HANDLE   g_ServiceStatusHandle = NULL;

HANDLE                  g_ServiceStopEvent = INVALID_HANDLE_VALUE;

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

int _tmain(int argc, TCHAR* 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, LPTSTR* argv)
{
    DWORD Status = E_FAIL;

    g_ServiceStatusHandle = RegisterServiceCtrlHandler(SERVICE_NAME, ServiceCtrlHandler);

    if (g_ServiceStatusHandle == NULL)
    {
        return;
    }

    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_ServiceStatusHandle, &g_ServiceStatus) == FALSE)
    {
        return;
    }

    g_ServiceStopEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
    if (g_ServiceStopEvent == NULL)
    {
        g_ServiceStatus.dwCurrentState = SERVICE_STOPPED;
        g_ServiceStatus.dwWin32ExitCode = GetLastError();
        SetServiceStatus(g_ServiceStatusHandle, &g_ServiceStatus);
        return;
    }

    g_ServiceStatus.dwControlsAccepted |= SERVICE_ACCEPT_STOP;
    g_ServiceStatus.dwControlsAccepted |= SERVICE_ACCEPT_SHUTDOWN;
    g_ServiceStatus.dwCurrentState = SERVICE_RUNNING;
    SetServiceStatus(g_ServiceStatusHandle, &g_ServiceStatus);

    HANDLE hThread = CreateThread(NULL, 0, ServiceWorkerThread, NULL, 0, NULL);

    WaitForSingleObject(hThread, INFINITE);

    CloseHandle(g_ServiceStopEvent);

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

VOID WINAPI ServiceCtrlHandler(DWORD CtrlCode)
{
    switch (CtrlCode)
    {
    case SERVICE_CONTROL_STOP:
        if (g_ServiceStatus.dwCurrentState != SERVICE_RUNNING)
            break;

        g_ServiceStatus.dwControlsAccepted = 0;
        g_ServiceStatus.dwCurrentState = SERVICE_STOP_PENDING;
        g_ServiceStatus.dwWin32ExitCode = 0;
        g_ServiceStatus.dwCheckPoint = 4;
        SetServiceStatus(g_ServiceStatusHandle, &g_ServiceStatus);

        SetEvent(g_ServiceStopEvent);
        break;

    case SERVICE_CONTROL_SHUTDOWN:
        g_ServiceStatus.dwControlsAccepted = 0;
        g_ServiceStatus.dwCurrentState = SERVICE_STOP_PENDING;
        g_ServiceStatus.dwWin32ExitCode = 0;
        g_ServiceStatus.dwCheckPoint = 3;
        SetServiceStatus(g_ServiceStatusHandle, &g_ServiceStatus);

        SetEvent(g_ServiceStopEvent);
        break;

    default:
        break;
    }
}

DWORD WINAPI ServiceWorkerThread(LPVOID lpParam)
{
    while (WaitForSingleObject(g_ServiceStopEvent, 0) != WAIT_OBJECT_0)
    {
        // 监控进程并重启
        STARTUPINFO si = { sizeof(si) };
        PROCESS_INFORMATION pi;

        // 进程路径和名称
        TCHAR szProcessPath[] = _T("C:\\Windows\\notepad.exe");

        if (!CreateProcess(szProcessPath, NULL, NULL, NULL, FALSE, NORMAL_PRIORITY_CLASS, NULL, NULL, &si, &pi))
        {
            // 进程启动失败，可以在这里记录日志
        }
        else
        {
            // 进程启动成功，可以在这里记录日志
            // 等待进程结束
            WaitForSingleObject(pi.hProcess, INFINITE);

            // 关闭句柄
            CloseHandle(pi.hProcess);
            CloseHandle(pi.hThread);
        }

        // 等待一段时间后重启
        Sleep(5000);
    }

    return ERROR_SUCCESS;
}

上述代码会定时监控 C:\Windows\notepad.exe 进程，并在进程关闭时重新启动它。你可以将 szProcessPath 改为你所需的进程路径和名称。如果你需要打开进程的界面，可以在 CreateProcess 函数的第一个参数中指定要启动的应用程序路径和名称。

要安装该服务，你需要使用管理员权限打开命令提示符，然后运行以下命令：

sc create MyService binPath= "C:\path\to\MyService.exe"

其中，MyService 是服务名称，C:\path\to\MyService.exe 是服务可执行文件的路径。你需要将该路径改为你自己的可执行文件路径。

要启动该服务，你可以使用以下命令：

net start MyService

要停止该服务，你可以使用以下命令：

net stop MyService

注意：在 Windows 系统中，服务运行时没有桌面交互权限，因此无法直接打开界面。如果你需要打开界面，你可以使用 CreateProcess 函数的第一个参数指定要启动的应用程序路径和名称，该应用程序应具有桌面交互权限。