reactos操作系统实现(54)

从函数RunUSetup的循环处理里，可以看到第一个应处理，就是启动页面，也就是调用函数SetupStartPage，它的代码如下：

#001  /*

#002   * Start page

#003   * RETURNS

#004   *   Number of the next page.

#005   */

#006  static PAGE_NUMBER

#007  SetupStartPage(PINPUT_RECORD Ir)

#008  {

#009      SYSTEM_DEVICE_INFORMATION Sdi;

#010      NTSTATUS Status;

#011      WCHAR FileNameBuffer[MAX_PATH];

#012      INFCONTEXT Context;

#013      PWCHAR Value;

#014      UINT ErrorLine;

#015      ULONG ReturnSize;

#016      PGENERIC_LIST_ENTRY ListEntry;

#017 

 

在显示器上显示等待字符串。

#018      CONSOLE_SetStatusText(MUIGetString(STRING_PLEASEWAIT));

#019 

#020 

 

检查是否有一个硬盘可以使用。

#021      /* Check whether a harddisk is available */

#022      Status = NtQuerySystemInformation (SystemDeviceInformation,

#023                                         &Sdi,

#024                                         sizeof(SYSTEM_DEVICE_INFORMATION),

#025                                         &ReturnSize);

#026 

 

如果没有硬盘可以使用，就返回出错。

#027      if (!NT_SUCCESS (Status))

#028      {

#029          CONSOLE_PrintTextXY(6, 15, "NtQuerySystemInformation() failed (Status 0x%08lx)", Status);

#030          MUIDisplayError(ERROR_DRIVE_INFORMATION, Ir, POPUP_WAIT_ENTER);

#031          return QUIT_PAGE;

#032      }

#033 

#034      if (Sdi.NumberOfDisks == 0)

#035      {

#036          MUIDisplayError(ERROR_NO_HDD, Ir, POPUP_WAIT_ENTER);

#037          return QUIT_PAGE;

#038      }

#039 

 

获取源安装目录和根目录路径。

#040      /* Get the source path and source root path */

#041      Status = GetSourcePaths(&SourcePath,

#042                              &SourceRootPath,

#043                              &SourceRootDir);

#044 

#045      if (!NT_SUCCESS(Status))

#046      {

#047          CONSOLE_PrintTextXY(6, 15, "GetSourcePaths() failed (Status 0x%08lx)", Status);

#048          MUIDisplayError(ERROR_NO_SOURCE_DRIVE, Ir, POPUP_WAIT_ENTER);

#049          return QUIT_PAGE;

#050      }

#051  #if 0

#052      else

#053      {

#054          CONSOLE_PrintTextXY(6, 15, "SourcePath: '%wZ'", &SourcePath);

#055          CONSOLE_PrintTextXY(6, 16, "SourceRootPath: '%wZ'", &SourceRootPath);

#056          CONSOLE_PrintTextXY(6, 17, "SourceRootDir: '%wZ'", &SourceRootDir);

#057      }

#058  #endif

#059 

 

准备txtsetup.sif文件路径，以便加载它到内存。txtsetup.sif是一个安装信息文件（sif），主要用于 Reactos 的文本安装模式。

#060      /* Load txtsetup.sif from install media. */

#061      wcscpy(FileNameBuffer, SourcePath.Buffer);

#062      wcscat(FileNameBuffer, L"//txtsetup.sif");

#063 

#064      SetupInf = SetupOpenInfFileW(FileNameBuffer,

#065                                   NULL,

#066                                   INF_STYLE_WIN4,

#067                                   &ErrorLine);

#068 

#069      if (SetupInf == INVALID_HANDLE_VALUE)

#070      {

#071          MUIDisplayError(ERROR_LOAD_TXTSETUPSIF, Ir, POPUP_WAIT_ENTER);

#072          return QUIT_PAGE;

#073      }

#074 

 

查找安装信息文件的版本信息。

#075      /* Open 'Version' section */

#076      if (!SetupFindFirstLineW (SetupInf, L"Version", L"Signature", &Context))

#077      {

#078          MUIDisplayError(ERROR_CORRUPT_TXTSETUPSIF, Ir, POPUP_WAIT_ENTER);

#079          return QUIT_PAGE;

#080      }

#081 

#082      /* Get pointer 'Signature' key */

#083      if (!INF_GetData (&Context, NULL, &Value))

#084      {

#085          MUIDisplayError(ERROR_CORRUPT_TXTSETUPSIF, Ir, POPUP_WAIT_ENTER);

#086          return QUIT_PAGE;

#087      }

#088 

 

检查版本标志是否为ReactOS。

#089      /* Check 'Signature' string */

#090      if (_wcsicmp(Value, L"$ReactOS$") != 0)

#091      {

#092          MUIDisplayError(ERROR_SIGNATURE_TXTSETUPSIF, Ir, POPUP_WAIT_ENTER);

#093          return QUIT_PAGE;

#094      }

#095 

 

启动即插即用事件处理线程。

#096      /* Start PnP thread */

#097      if (hPnpThread != INVALID_HANDLE_VALUE)

#098      {

#099          NtResumeThread(hPnpThread, NULL);

#100          hPnpThread = INVALID_HANDLE_VALUE;

#101      }

#102 

 

检查是否需要自动安装，也就是不需要人为地关注的安装。

#103      CheckUnattendedSetup();

#104 

 

如果自动安装启用，就进行系统默认的配置安装，否则就需要人工地选择后面的安装功能。

#105      if (IsUnattendedSetup)

#106      {

#107          //TODO

#108          //read options from inf

#109          ComputerList = CreateComputerTypeList(SetupInf);

#110          DisplayList = CreateDisplayDriverList(SetupInf);

#111          KeyboardList = CreateKeyboardDriverList(SetupInf);

#112          LayoutList = CreateKeyboardLayoutList(SetupInf, DefaultKBLayout);

#113          LanguageList = CreateLanguageList(SetupInf, DefaultLanguage);

#114             

#115              /* new part */

#116             

#117              wcscpy(SelectedLanguageId,LocaleID);

#118             

#119                           

#120              /* first we hack LanguageList */

#121              ListEntry = GetFirstListEntry(LanguageList);

#122 

#123              while (ListEntry != NULL)

#124              {

#125                     if (!wcscmp(LocaleID, GetListEntryUserData(ListEntry)))

#126                     {

#127                            DPRINT("found %S in LanguageList/n",GetListEntryUserData(ListEntry));

#128                            SetCurrentListEntry(LanguageList, ListEntry);

#129                            break;

#130                     }

#131 

#132                     ListEntry = GetNextListEntry(ListEntry);

#133              }

#134              /* now LayoutList */

#135              ListEntry = GetFirstListEntry(LayoutList);

#136 

#137              while (ListEntry != NULL)

#138              {

#139                     if (!wcscmp(LocaleID, GetListEntryUserData(ListEntry)))

#140                     {

#141                            DPRINT("found %S in LayoutList/n",GetListEntryUserData(ListEntry));

#142                            SetCurrentListEntry(LayoutList, ListEntry);

#143                            break;

#144                     }

#145 

#146                     ListEntry = GetNextListEntry(ListEntry);

#147              }

#148          SetConsoleCodePage();

#149 

#150           return INSTALL_INTRO_PAGE;

#151      }

#152 

 

在这里返回人工安装的下一个功能页面，就是语言选择。

#153      return LANGUAGE_PAGE;

#154  }

#155 

 

通过上面这个函数，就可以打开安装信息文件，然后判断是否自动安装系统，如果是就进入自动安装过程。如果不是自动安装，就进入下一步的人工选项。