win32

参考这篇教程：Simple Windows Service in C++

安装service需要在管理员权限下运行cmd，并输入下面的命令行

C:>sc create "My Sample Service" binPath= C:SampleService.exe

My Sample Service是service name，可以随意更改。 后面的exe程序是我们需要执行的service，代码如下。

卸载service，输入， 

C:>sc delete "My Sample Service"  

代码样例：

#include <Windows.h>
#include <tchar.h>
#include <wtsapi32.h>

#pragma comment(lib,"Wtsapi32.lib")


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

HANDLE g_hChildStd_Rd = NULL;
HANDLE g_hChildStd_Wr = NULL;

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

#define SERVICE_NAME  _T("My Sample Service")

int _tmain(int argc, TCHAR* argv[])
{
    OutputDebugString(_T("My Sample Service: Main: Entry"));

    SERVICE_TABLE_ENTRY ServiceTable[] =
    {
        {(LPWSTR)SERVICE_NAME, (LPSERVICE_MAIN_FUNCTION)ServiceMain},
        {NULL, NULL}
    };

    if (StartServiceCtrlDispatcher(ServiceTable) == FALSE)
    {
        OutputDebugString(_T("My Sample Service: Main: StartServiceCtrlDispatcher returned error"));
        return GetLastError();
    }

    OutputDebugString(_T("My Sample Service: Main: Exit"));
    return 0;
}


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

    OutputDebugString(_T("My Sample Service: ServiceMain: Entry"));

    g_StatusHandle = RegisterServiceCtrlHandler(SERVICE_NAME, ServiceCtrlHandler);

    if (g_StatusHandle == NULL)
    {
        OutputDebugString(_T("My Sample Service: ServiceMain: RegisterServiceCtrlHandler returned error"));
        goto EXIT;
    }

    // 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 neccesary to start the service here
     */
    OutputDebugString(_T("My Sample Service: ServiceMain: Performing Service Start Operations"));

    // Create stop event to wait on later.
    g_ServiceStopEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
    if (g_ServiceStopEvent == NULL)
    {
        OutputDebugString(_T("My Sample Service: ServiceMain: CreateEvent(g_ServiceStopEvent) returned error"));

        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"));
        }
        goto EXIT;
    }

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

    OutputDebugString(_T("My Sample Service: ServiceMain: Waiting for Worker Thread to complete"));

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

    OutputDebugString(_T("My Sample Service: ServiceMain: Worker Thread Stop Event signaled"));


    /*
     * Perform any cleanup tasks
     */
    OutputDebugString(_T("My Sample Service: ServiceMain: Performing Cleanup Operations"));

    CloseHandle(g_ServiceStopEvent);

    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"));
    }

EXIT:
    OutputDebugString(_T("My Sample Service: ServiceMain: Exit"));

    return;
}


VOID WINAPI ServiceCtrlHandler(DWORD CtrlCode)
{
    OutputDebugString(_T("My Sample Service: ServiceCtrlHandler: Entry"));

    switch (CtrlCode)
    {
    case SERVICE_CONTROL_STOP:

        OutputDebugString(_T("My Sample Service: ServiceCtrlHandler: SERVICE_CONTROL_STOP Request"));

        if (g_ServiceStatus.dwCurrentState != SERVICE_RUNNING)
            break;

        /*
         * Perform tasks neccesary 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;
    }

    OutputDebugString(_T("My Sample Service: ServiceCtrlHandler: Exit"));
}


DWORD WINAPI ServiceWorkerThread(LPVOID lpParam)
{
    OutputDebugString(_T("My Sample Service: ServiceWorkerThread: Entry"));
    WCHAR station[] = L"Winsta0\default";
    SECURITY_ATTRIBUTES saAttr;
    saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
    saAttr.bInheritHandle = TRUE;
    saAttr.lpSecurityDescriptor = NULL;

    CreatePipe(&g_hChildStd_Rd, &g_hChildStd_Wr, &saAttr, 0);

    STARTUPINFO si;
    ZeroMemory(&si, sizeof(STARTUPINFO));
    si.cb = sizeof(STARTUPINFO);
    si.hStdOutput = g_hChildStd_Wr;
    si.hStdError = g_hChildStd_Wr;
    si.lpDesktop = station;
    si.dwFlags = STARTF_USESTDHANDLES;
    PROCESS_INFORMATION pi;

    HANDLE hToken;
    bool err = WTSQueryUserToken(WTSGetActiveConsoleSessionId(), &hToken);
    WCHAR path[] = L"D:\child.exe";
    if (CreateProcessAsUser(hToken, path, NULL, 0, 0, true, CREATE_NO_WINDOW, 0, 0, &si, &pi))
    {
        CloseHandle(g_hChildStd_Wr);
        DWORD ret = WaitForSingleObject(pi.hProcess, 2000); //wait for the child process exit.
        if (ret == 0)
        {
            WCHAR chBuf[100]= L"HELLO WORLD";
            DWORD dwRead, dwWritten,
            err = ReadFile(g_hChildStd_Rd, chBuf, 100, &dwRead, NULL);
            HANDLE hFile = CreateFile(L"123.txt",                // name of the write
                GENERIC_WRITE,          // open for writing
                0,                      // do not share
                NULL,                   // default security
                CREATE_NEW,             // create new file only
                FILE_ATTRIBUTE_NORMAL,  // normal file
                NULL);                  // no attr. template
            WriteFile(
                hFile,           // open file handle
                chBuf,      // start of data to write
                100,  // number of bytes to write
                &dwWritten, // number of bytes that were written
                NULL);            // no overlapped structure
        }
    }
    //  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(3000);
    }

    OutputDebugString(_T("My Sample Service: ServiceWorkerThread: Exit"));

    return ERROR_SUCCESS;
}

在Winsta0default中创建子进程，在service中使用CreateProcessAsUser调用子进程。

文档参考：Window Stations

如果需要service与子进程建立通信，可以使用匿名管道，代码中已经创建了管道，我没有使用它们。 

如果对匿名管道的数据传输有兴趣的，可以参考我的另外一篇文章： win32 - 匿名管道的使用