C++:检查计算机是否被锁定

Question

我想弄清楚计算机是否已锁定。

我看过LockWorkStation函数，但我希望找到的函数是 IsWorkStationLocked。

---

我需要支持所有 windows 版本 >= XP

Answer 1

对于 Windows 7 和更高版本，可以使用 WTS API:

bool IsSessionLocked() {
    typedef BOOL (PASCAL * WTSQuerySessionInformation)(HANDLE hServer, DWORD SessionId, WTS_INFO_CLASS WTSInfoClass, LPTSTR* ppBuffer, DWORD* pBytesReturned);
    typedef void (PASCAL * WTSFreeMemory)( PVOID pMemory);

    WTSINFOEXW * pInfo = NULL;
    WTS_INFO_CLASS wtsic = DW_WTSSessionInfoEx;
    bool bRet = false;
    LPTSTR ppBuffer = NULL;
    DWORD dwBytesReturned = 0;
    LONG dwFlags = 0;
    WTSQuerySessionInformation pWTSQuerySessionInformation = NULL;
    WTSFreeMemory pWTSFreeMemory = NULL;

    HMODULE hLib = LoadLibrary( _T("wtsapi32.dll") );
    if (!hLib) {
        return false;
    }
    pWTSQuerySessionInformation = (WTSQuerySessionInformation)GetProcAddress(hLib, "WTSQuerySessionInformationW" );
    if (!pWTSQuerySessionInformation) {
        goto EXIT;
    }

    pWTSFreeMemory = (WTSFreeMemory)GetProcAddress(hLib, "WTSFreeMemory" );
    if (pWTSFreeMemory == NULL) {
        goto EXIT;
    }

    if(pWTSQuerySessionInformation(WTS_CURRENT_SERVER_HANDLE, g_dwSessionID, wtsic, &ppBuffer, &dwBytesReturned)) {
        if(dwBytesReturned > 0) {
            pInfo =  (WTSINFOEXW*)ppBuffer; 
            if (pInfo->Level == 1) {
                dwFlags = pInfo->Data.WTSInfoExLevel1.SessionFlags;
            }
            if (dwFlags == WTS_SESSIONSTATE_LOCK) {
                bRet = true;
            }
        }
        pWTSFreeMemory(ppBuffer);
        ppBuffer = NULL;
    }
EXIT:
    if (hLib != NULL) {
        FreeLibrary(hLib);
    }
    return bRet;
}

请查看以下文章以了解支持 WTSINFOEX 结构的平台: https://technet.microsoft.com/ru-ru/sysinternals/ee621017