Question

我在Windows 7的Session 0服务下从HID设备读取时遇到问题。在普通的桌面用户下，我可以很好地从设备上读取。但是，当我尝试使用会话0下的重叠I / O读取它时，WaitForSingleObject（）始终返回WAIT_TIMEOUT，而ReadFile的缓冲区从不包含任何有效数据。这对我来说似乎是一个Session 0隔离问题，但我找不到任何关于如何解决这个问题。在会话0下读取HID设备是否无效？

感谢。

Answer 1

void ImpersonateConsoleSession(DWORD dwSessionId)
{
    PROCESSENTRY32 procEntry;
    HANDLE hSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
    procEntry.dwSize = sizeof(PROCESSENTRY32);
    Process32First(hSnap, &procEntry);
    DWORD winlogonPid = 0;
    do {
        if (!wcscmp(procEntry.szExeFile, L"winlogon.exe"))
        {
            DWORD winlogonSessId = 0;
            if (ProcessIdToSessionId(procEntry.th32ProcessID, &winlogonSessId) && winlogonSessId == dwSessionId)
            {
                winlogonPid = procEntry.th32ProcessID;
                break;
            }
        }
    } while (Process32Next(hSnap, &procEntry) != 0);
    CloseHandle(hSnap);
    if (winlogonPid)
    {
        HANDLE hProcess = OpenProcess(MAXIMUM_ALLOWED, 0, winlogonPid);
        HANDLE hPToken;
        OpenProcessToken(hProcess, TOKEN_QUERY | TOKEN_DUPLICATE, &hPToken);
        CloseHandle(hProcess);
        HANDLE hUserTokenDup;
        DuplicateTokenEx(hPToken, MAXIMUM_ALLOWED, 0, SecurityIdentification, TokenPrimary, &hUserTokenDup);
        CloseHandle(hPToken);
        ImpersonateLoggedOnUser(hUserTokenDup);
        CloseHandle(hUserTokenDup);
    }
}

然后使用SQOS参数打开您的设备：

ImpersonateConsoleSession(WTSGetActiveConsoleSessionId());
HANDLE hdevice = CreateFile(..., SECURITY_SQOS_PRESENT | SECURITY_IDENTIFICATION, 0);
RevertToSelf();

从Windows 7服务读取HID设备时出现问题（会话0）

1 个答案: