experiment : 字符串分解 on drv

需求:  分解字符串, 提取分隔符之间的内容

字符串输入: \\MY-DEV2\MyShareDir\test.txt

分解成3部分: MY-DEV2 + MyShareDir + test.txt

    switch(ulCtrlCode)    {    case IO_CTRL_CODE_UNC_QUERY:        DbgPrint("IO_CTRL_CODE_UNC_QUERY\r\n");        sRc = fnUncFileQuery(pInputBuffer, ulinputSize, &UncFileQueryInfo);        pIrp->IoStatus.Status = sRc;        pIrp->IoStatus.Information = (STATUS_SUCCESS == sRc) ? sizeof(TAG_UNC_FILE_QUERY_INFO) : 0;        if (STATUS_SUCCESS == sRc)        {            if (*pulOutputSize >= sizeof(TAG_UNC_FILE_QUERY_INFO))            {                RtlCopyMemory(pOutputBuffer, (PVOID)(&UncFileQueryInfo), sizeof(TAG_UNC_FILE_QUERY_INFO));            }            else            {                pIrp->IoStatus.Status = STATUS_BUFFER_TOO_SMALL;                pIrp->IoStatus.Information = 0;            }        }        break;    default:        DbgPrint("Unknown ulCtrlCode\r\n");        pIrp->IoStatus.Status = STATUS_SUCCESS;        pIrp->IoStatus.Information = 0;        break;    }

NTSTATUS fnUncFileQuery(PVOID pcUncPathName, ULONG ulLenUncPathName, TAG_UNC_FILE_QUERY_INFO * pUncFileQueryInfo){    /// ulLenUncPathName 是字节长度    ULONG   dwRc    =   E_SUCCESS;    if (PASSIVE_LEVEL != KeGetCurrentIrql())    {        DbgPrint("PASSIVE_LEVEL != KeGetCurrentIrql()\r\n");        return KfRaiseIrql(PASSIVE_LEVEL);    }    if (        (NULL == pcUncPathName)        || (NULL == pUncFileQueryInfo)        || (ulLenUncPathName <= 0))    {        return STATUS_INVALID_PARAMETER;    }    /// 从UncPathName中取出 主机名, 共享文件夹名称, 剩下的内容(共享文件中的子文件夹+共享文件名称)    dwRc = fnParseUncPathName((wchar_t *)pcUncPathName, pUncFileQueryInfo);    if (E_SUCCESS != dwRc)    {        DbgPrint("fnParseUncPathName(%S) = %d\r\n", pcUncPathName, dwRc);        return STATUS_INVALID_PARAMETER;    }    /// 判断主机名是否是本机    /// 判断共享文件夹 是否为本地的共享文件夹    /// 重组UNC文件全路径名 => 实际的文件名, 写入输出参数    return STATUS_SUCCESS;}DWORD fnParseUncPathName(wchar_t * pszUncPathName, TAG_UNC_FILE_QUERY_INFO * pUncFileQueryInfo){    //     \\MY-DEV2\MyShareDir\test.txt///< \\主机名称\共享文件夹名称\共享子文件夹\共享文件名称    //     \\Localhost\MyShareDir\test.txt///< \\Localhost\共享文件夹名称\共享子文件夹\共享文件名称    //     \\192.168.1.60\MyShareDir\test.txt///< \\IP地址\共享文件夹名称\共享子文件夹\共享文件名称        ULONG       dwRc            =   E_SUCCESS;    wchar_t *   pszFindBegin    =   NULL;    wchar_t *   pszFindEnd      =   NULL;    const wchar_t * pszUncFileNameHead      =   L"\\\\";    ///< UNC 文件名以 L"\\\\" 起头    const wchar_t * pszUncFileNameSeparator =   L"\\";    ///< UNC 文件名 元素间的分隔符    if (PASSIVE_LEVEL != KeGetCurrentIrql())    {        DbgPrint("PASSIVE_LEVEL != KeGetCurrentIrql()\r\n");        return KfRaiseIrql(PASSIVE_LEVEL);    }    RtlZeroMemory(pUncFileQueryInfo, sizeof(TAG_UNC_FILE_QUERY_INFO));    DbgPrint("pszUncPathName = %S\r\n", pszUncPathName);    RtlCopyMemory(pUncFileQueryInfo->szUncFilePathName,         pszUncPathName,         wcslen(pszUncPathName) * sizeof(wchar_t));    /// 查找主机名称    pszFindBegin = wcsstr(pUncFileQueryInfo->szUncFilePathName, pszUncFileNameHead);    if ((NULL == pszFindBegin)        || (pszFindBegin != pUncFileQueryInfo->szUncFilePathName))  ///< 字符串开头就是引导符号    {        return E_PARAM;    }    pszFindBegin += wcslen(pszUncFileNameHead);   ///< 指向引导符号后的字符串    pszFindEnd = wcsstr(pszFindBegin, pszUncFileNameSeparator);    if (NULL == pszFindEnd)    {        return E_PARAM;    }    RtlCopyMemory(pUncFileQueryInfo->szHostName,         pszFindBegin,         (pszFindEnd - pszFindBegin) * sizeof(wchar_t));    /// 查找共享文件夹名称    pszFindBegin = pszFindEnd + 1;    pszFindEnd = wcsstr(pszFindBegin, pszUncFileNameSeparator);    if (NULL == pszFindEnd)    {        return E_PARAM;    }    RtlCopyMemory(pUncFileQueryInfo->szShareDir,         pszFindBegin,         (pszFindEnd - pszFindBegin) * sizeof(wchar_t));    /// 查找 共享文件名, 包含子文件夹    pszFindBegin = pszFindEnd + 1;    RtlCopyMemory(pUncFileQueryInfo->szShareFileName,         pszFindBegin,         wcslen(pszFindBegin) * sizeof(wchar_t));    return  dwRc;}