6 Data Access Common Functions

6.1 Deprecated Functions

DAInit and DaThreadInit have both been deprecated. DAInitEx now replaces these two functions. All new implementations should use DAInitEX, although the other two functions will continue to be supported.

6.2 DAInitEx

This function tells the Data Access module to perform any necessary initialization it needs to prepare for document access. This function must be called before the first time the application uses the module to retrieve data from any document. This function supersedes the old DAInit and DAThreadInit functions.

If the ThreadOption parameter is set to something other than DATHREAD_INIT_NOTHREADS, then this function's preparation includes setting up mutex function pointers to prevent threads from clashing in critical sections of the technology's code. The developer must actually code the threads after this function has been called. DAInitEx should be called only once per process and should be called before the developer's application begins the thread.

Prototype

DAERR DAInitEx(VTSHORT ThreadOption, VTDWORD dwFlags);

Parameters

• ThreadOption: can be one of the following values:

  • DATHREAD_INIT_NOTHREADS: No thread support requested.

  • DATHREAD_INIT_PTHREADS: Support for PTHREADS requested.

  • DATHREAD_INIT_NATIVETHREADS: Support for native threading requested. Supported only on Microsoft Windows platforms and Oracle Solaris.

• dwFlags: can be one or more of the following flags OR-ed together:

  • OI_INIT_DEFAULT: Options Load and Save are performed normally.

  • OI_INIT_NOSAVEOPTIONS: The options file will not be saved on exit.

  • OI_INIT_NOLOADOPTIONS: The options file will not be read during initialization.

Return Values

• DAERR_OK: If the initialization was successful. Otherwise, one of the other DAERR_ values in sccda.h or one of the SCCERR_ values in sccerr.h is returned.

6.3 DADeInit

This function tells the Data Access module that it will not be asked to read additional documents, so it should perform any cleanup tasks that may be necessary. This function should be called at application shutdown time, and only if the module was successfully initialized with a call to DAInitEx.

Prototype

DAERR DADeInit();

Return Values

• DAERR_OK: If the de-initialization was successful. Otherwise, one of the other DAERR_ values in sccda.h or one of the SCCERR_ values in sccerr.h is returned..

6.4 DAOpenDocument

Opens a source file to make it accessible by one or more of the data access technologies. If DAOpenDocument succeeds, DACloseDocument must be called regardless of any other API calls.

For IO types other than IOTYPE_REDIRECT, the subdocument specification may be specified as part of the file's path. This is accomplished by appending a question mark delimiter to the path, followed by the subdocument specification. For example, to specify the third item within the file c:\docs\file.zip, specify the path c:\docs\file.zip?item.3 in the call to DAOpenDocument. DAOpenDocument always attempts to open the specification as a file first. In the unlikely event there is a file with the same name (including the question mark) as a file plus the subdocument specification, that file is opened instead of the archive item.

To take advantage of this feature when providing access to the input file using redirected IO, a subdocument specification must be provided via a response to an IOGetInfo message, IOGETINFO_SUBDOC_SPEC. To specify an item in an archive, first follow the standard redirected IO methods to provide a BASEIO pointer to the archive file itself. To specify an item within the archive, a redirected IO object must respond to the IOGETINFO_SUBDOC_SPEC message by copying to the supplied buffer the subdocument specification of the archive item to be opened. This message is received during the processing of DAOpenDocument.

Prototype

DAERR DAOpenDocument(
   VTLPHDOC   lphDoc,
   VTDWORD    dwSpecType,
   VTLPVOID   pSpec,
   VTDWORD    dwFlags);

Parameters

• lphDoc: Pointer to a handle that will be filled with a value uniquely identifying the document to data access. The developer uses this handle in subsequent calls to data access to identify this particular source file. This is not an operating system file handle.

• dwSpecType: Describes the contents of pSpec. Together, dwSpecType and pSpec describe the location of the source file.

  Note:

  The values used within IOTYPE_ARCHIVEOBJECT, IOTYPE_LINKEDOBJECT, and IOTYPE_OBJECT may change if different options are applied, with different versions of the technology, or after patches are applied.

  Must be one of the following values:

  • IOTYPE_ANSIPATH: Windows only. pSpec points to a NULL-terminated full path name using the ANSI character set and FAT 8.3 (Win16) or NTFS (Win32 and Win64) file name conventions.

  • IOTYPE_UNICODEPATH: Windows only. pSpec points to a NULL-terminated full path name using the Unicode character set and NTFS (Win32 and Win64) file name conventions.

  • IOTYPE_UNIXPATH: UNIX platforms only. pSpec points to a NULL-terminated full path name using the system default character set and UNIX path conventions. Unicode paths can be accessed on UNIX platforms by using a UTF-8 encoded path with IOTYPE_UNIXPATH.

  • IOTYPE_REDIRECT: All platforms. pSpec points to a developer-defined struct that allows the developer to redirect the IO routines used to read the file. See Chapter 8, "Redirected IO" for more information.

  • IOTYPE_ARCHIVEOBJECT: All platforms. Opens an embedded archive object for data access. pSpec points to a structure IOSPECARCHIVEOBJECT (see "IOSPECARCHIVEOBJECT Structure" for details) that has been filled with values returned in a SCCCA_OBJECT content entry from Content Access.

  • IOTYPE_LINKEDOBJECT: All platforms. Opens an object specified by a linked object for data access. pSpec points to a structure IOSPECLINKEDOBJECT (see "IOSPECLINKEDOBJECT Structure") that has been filled with values returned in an SCCCA_BEGINTAG or SCCCA_ENDTAG with a subtype of SCCCA_LINKEDOBJECT content entry from Content Access.

• pSpec: File location specification.

• dwFlags: The low WORD is the file ID for the document (0 by default). If you set the file ID incorrectly, the technology fails. If set to 0, the file identification technology determines the input file type automatically. The high WORD should be set to 0.

Return Values

• DAERR_OK: Returned if the open was successful. Otherwise, one of the other DAERR_ values in sccda.h or one of the SCCERR_ values in sccerr.h is returned.

typedef struct IOSPECLINKEDOBJECTtag
   {
   VTDWORD    dwStructSize;
   VTSYSPARAM hDoc;
   VTDWORD    dwObjectId;  /* Object identifier. */
   VTDWORD    dwType;      /* Linked Object type */
                           /* (SO_LOCATORTYPE_*) */
   VTDWORD    dwParam1;    /* parameter for DoSpecial call */
   VTDWORD    dwParam2;    /* parameter for DoSpecial call */
   VTDWORD    dwReserved1; /* Reserved. */
   VTDWORD    dwReserved2; /* Reserved. */
} IOSPECLINKEDOBJECT,  * PIOSPECLINKEDOBJECT;

typedef struct IOSPECARCHIVEOBJECTtag
   {
   VTDWORD dwStructSize;
   VTDWORD hDoc;        /* Parent Doc hDoc */
   VTDWORD dwNodeId;    /* Node ID */
   VTDWORD dwStreamId; 
   VTDWORD dwReserved1; /* Must always be 0 */
   VTDWORD dwReserved2; /* Must always be 0 */
} IOSPECARCHIVEOBJECT,  * PIOSPECARCHIVEOBJECT;

6.5 DAOpenSubdocumentById

Allows an embedding to be opened using the integer value of the object_id attribute from the locator element.

Prototype

DAERR DAOpenSubdocumentById(
   VTHDOC     hDoc,
   VTLPHDOC   lphDoc,
   VTDWORD    dwSubdocumentId,
   VTDWORD    dwFlags);

Parameters

• hDoc: The document handle for the document containing the locator.

• lphDoc: Receives the document handle for the embedding.

• dwSubdocumentId: The integer value of the object_id attribute from the locator.

• dwFlags: Must be set to 0.

6.6 DACloseDocument

This function is called to close a file opened by the reader that has not encountered a fatal error.

Prototype

DAERR DACloseDocument(
   VTHDOC hDoc);

Parameters

• hDoc: Identifier of open document. Must be a handle returned by the DAOpenDocument function.

Return Value

• DAERR_OK: Returned if close succeeded. Otherwise, one of the other DAERR_ values in sccda.h or one of the SCCERR_ values in sccerr.h is returned.

6.7 DARetrieveDocHandle

This function returns the document handle associated with any type of Data Access handle. This allows the developer to only keep the value of hItem, instead of both hItem and hDoc.

Prototype

DAERR DARetrieveDocHandle(
   VTHDOC     hItem,
   VTLPHDOC   phDoc);

Parameters

• hItem: Identifier of open document. May be the subhandle returned by the DAOpenDocument or DAOpenTreeRecord functions in the data access submodule. Passing in an hDoc created by DAOpenDocument for this parameter results in an error.

• phDoc: Pointer to a handle to be filled with the document handle associated with the passed subhandle.

Return Value

• DAERR_OK: Returned if the handle in phDoc is valid. Otherwise, one of the other DAERR_ values in sccda.h or one of the SCCERR_ values in sccerr.h is returned.

6.8 DASetOption

This function is called to set the value of a data access option.

Prototype

DAERR DASetOption(
   VTHDOC      hDoc,
   VTDWORD     dwOptionId,
   VTLPVOID    pValue,
   VTDWORD     dwValueSize);

Parameters

• hDoc: Identifier of open document. May be a VTHDOC returned by the DAOpenDocument function, or the subhandle returned by the DAOpenDocument or DAOpenTreeRecord functions (VTHCONTENT, VTHTEXT, etc.). Setting an option for a VTHDOC affects all subhandles opened under it, while setting an option for a subhandle affects only that handle.

  If this parameter is NULL, then setting the option affects all documents opened thereafter. Once an option is set using the NULL handle, this option becomes the default option thereafter. This parameter should only be set to NULL if the option being set can take that value.

• dwOptionId: The identifier of the option to be set.

• pValue: Pointer to a buffer containing the value of the option.

• dwValueSize: The size in bytes of the data pointed to by pValue. For a string value, the NULL terminator should be included when calculating dwValueSize.

Return Value

• DAERR_OK: Returned if DASetOption succeeded. Otherwise, one of the other DAERR_ values in sccda.h or one of the SCCERR_ values in sccerr.h is returned.

6.9 DAGetOption

This function is called to retrieve the value of a data access option. The results of a call to this option are only valid if DASetOption has already been called on the option.

Prototype

DAERR DAGetOption(
   VTHDOC    hItem,
   VTDWORD   dwOptionId,
   VTLPVOID  pValue,
   VTLPDWORD pSize);

Parameters

• hItem: Identifier of open document. May be a VTHDOC returned by the DAOpenDocument function, or the subhandle returned by the DAOpenDocument or DAOpenTreeRecord functions (VTHCONTENT, VTHTEXT, etc.). Getting an option for a VTHDOC gets the value of that option for that handle, which may be different than the subhandle's value.

• dwOptionId: The identifier of the option to be returned.

• pValue: Pointer to a buffer containing the value of the option.

• pSize: This VTDWORD should be initialized by the caller to the size of the buffer pointed to by pValue. If this size is sufficient, the option value is copied into pValue and pSize is set to the actual size of the option value. If the size is not sufficient, pSize is set to the size of the buffer needed for the option and an error is returned.

Return Value

• DAERR_OK: Returned if DAGetOption was successful. Otherwise, one of the other DAERR_ values in sccda.h or one of the SCCERR_ values in sccerr.h is returned.

6.10 DAGetFileId

This function allows the developer to retrieve the format of the file based on the technology's content-based file identification process. This can be used to make intelligent decisions about how to process the file and to give the user feedback about the format of the file they are working with.

Note: in cases where File ID returns a value of FI_UNKNOWN, then this function will apply the Fallback Format before returning a result.

Prototype

DAERR DAGetFileId(
   VTHDOC      hDoc,
   VTLPDWORD   pdwFileId);

Parameters

• hDoc: Identifier of open document. May be a VTHDOC returned by the DAOpenDocument function, a VTHEXPORT returned by the EXOpenExport function, or the subhandle returned by the DAOpenDocument or DAOpenTreeRecord functions (VTHEXPORT, VTHCONTENT, VTHTEXT, etc.).

• pdwFileId: Pointer to a DWORD that receives a file identification number for the file. These numbers are defined in sccfi.h.

Return Value

• DAERR_OK: Returned if DAGetFileId was successful. Otherwise, one of the other DAERR_ values in sccda.h or one of the SCCERR_ values in sccerr.h is returned.

6.11 DAGetFileIdEx

This function allows the developer to retrieve the format of the file based on the technology's content-based file identification process. This can be used to make intelligent decisions about how to process the file and to give the user feedback about the format of the file they are working with. This function has all the functionality of DAGetFileID and adds the ability to return the raw FI value; in other words, the value returned by normal FI, without applying the FallbackFI setting.

Prototype

DAERR DAGetFileIdEx(
   VTHDOC      hDoc,
   VTLPDWORD   pdwFileId,
   VTDWORD     dwFlags);

Parameters

• hDoc: Identifier of open document. May be a VTHDOC returned by the DAOpenDocument function, or the subhandle returned by the DAOpenDocument or DAOpenTreeRecord functions (VTHEXPORT, VTHCONTENT, VTHTEXT, etc.).

• pdwFileId: Pointer to a DWORD that receives a file identification number for the file. These numbers are defined in sccfi.h.

• dwFlags: DWORD that allows user to request specific behavior.

  • DA_FILEINFO_RAWFI: This flag tells DAGetFileIdEx() to return the result of the File Identification operation before Extended File Ident. is performed and without applying the FallbackFI value.

Return Value

• DAERR_OK: Returned if DAGetFileIdEx was successful. Otherwise, one of the other DAERR_ values in sccda.h or one of the SCCERR_ values in sccerr.h is returned. See the following tables for examples of expected output depending on the value of various options.

Values with RAWFI turned off

Values with RAWFI turned on

6.12 DAGetObjectInfo

This function returns information about the document or object pointed to by hDoc. The object may be an embedded object, a linked object, or a compressed file.

DAERR DAGetObjectInfo(
   VTHDOC     hDoc,
   VTDWORD    dwInfoId,
   VTLPVOID   pInfo);

Parameters

• hDoc: The handle returned by DAOpenDocument.

• dwInfoId: The identifier of the requested information. Can be any of the following values:

  • DAOBJECT_NAME_A: Retrieves the name of the object, in 8-bit characters. pInfo points to a buffer of size DA_PATHSIZE.

  • DAOBJECT_NAME_W: Retrieves the name of the object in Unicode characters. pInfo points to a buffer of 16 bit characters of size DA_PATHSIZE.

  • DAOBJECT_FORMATID: Retrieves the file ID of the object. pInfo points to a VTDWORD value.

  • DAOBJECT_COMPRESSIONTYPE: Retrieves an identifier of the type of compression used to store the object, if known. pInfo points to a VTDWORD value.

  • DAOBJECT_FLAGS: Retrieves a bitfield of flags indicating additional attributes of the object. pInfo points to a VTDWORD value. Possible flag values include DAOBJECTFLAG_PARTIALFILE (would not normally exist outside the source document), DAOBJECTFLAG_PROTECTEDFILE (encrypted or password protected), DAOBJECTFLAG_LINKTOFILE (indicates that an OLE object is linked to the file and a corresponding file is not found on the host machine), DAOBJECTFLAG_UNIDENTIFIEDFILE (indicates that an object could not be identified), and DAOBJECTFLAG_UNSUPPORTEDCOMP (compressed with an unsupported compression), and DAOBJECTFLAG_ARCKNOWNENCRYPT (see note below).

• pInfo: Destination of the requested information. The possible types are described in the preceding section about dwInfoId.

Return Values

• DAERR_OK: Returned if the save was successful. Otherwise, one of the other DAERR_ values in sccda.h or one of the SCCERR_ values in sccerr.h is returned.

6.13 DAGetErrorString

This function returns to the developer a string describing the input error code. If the error string returned does not fit the buffer provided, it is truncated.

VTVOID DAGetErrorString(
   DAERR      deError,
   VTLPVOID   pBuffer,
   VTDWORD    dwBufSize);

Parameters

• Error: Error code passed in by the developer for which an error message is to be returned.

• pBuffer: This buffer is allocated by the caller and is filled in with the error message by this routine. The error message will be a NULL-terminated string.

• dwBufSize: Size of what pBuffer points to in bytes.

Return Value

• none

6.14 DAGetTreeCount

This function is called to retrieve the number of records in an archive file.

DAERR DAGetTreeCount(
      VTHDOC      hDoc,
      VTLPDWORD   lpRecordCount);

Parameters

• hDoc: Identifier of open document. May be a VTHDOC returned by the DAOpenDocument function, or the subhandle returned by any of the DAOpenDocument or DAOpenTreeRecord functions (VTHCONTENT, VTHTEXT, etc.).

• lpRecordCount: A pointer to a VTLPDWORD that is filled with the number of stored archive records.

Return Value

• DAERR_OK: DAGetTreeCount was successful. Otherwise, one of the other DAERR_ values in sccda.h or one of the SCCERR_ values in sccerr.his returned.

• DAERR_BADPARAM: The selected file does not contain an archive section, or the requested record does not exist.

6.15 DAGetTreeRecord

This function is called to retrieve information about a record in an archive file.

DAERR DAGetTreeRecord(
      VTHDOC         hDoc,
      PSCCDATREENODE pTreeNode);

Parameters

• hDoc: Identifier of open document. May be a VTHDOC returned by the DAOpenDocument function, or the subhandle by any of the DAOpenDocument or DAOpenTreeRecord functions (VTHCONTENT, VTHTEXT, etc.).

• pTreeNode: A pointer to a PSCCDATREENODE structure that is filled with information about the selected record.

Return Values

• DAERR_OK: DAGetTreeRecord was successful. Otherwise, one of the other DAERR_ values in sccda.h or one of the SCCERR_ values in sccerr.h is returned.

• DAERR_BADPARAM: The selected file does not contain an archive section, or the requested record does not exist.

• DAERR_EMPTYFILE: Empty file.

• DAERR_PROTECTEDFILE: Password protected or encrypted file.

• DAERR_SUPFILEOPENFAILS: Supplementary file open failed.

• DAERR_FILTERNOTAVAIL: The file's type is known, but the appropriate filter is not available.

• DAERR_FILTERLOADFAILED: An error occurred during the initialization of the appropriate filter.

typedef struct SCCDATREENODEtag{
   VTDWORD   dwSize;
   VTDWORD   dwNode;
   VTBYTE    szName[1024];
   VTDWORD   dwFileSize;
   VTDWORD   dwTime;
   VTDWORD   dwFlags;
   VTDWORD   dwCharSet;
   } SCCDATREENODE,  *PSCCDATREENODE;

6.16 DAOpenTreeRecord

This function is called to open a record within an archive file and make it accessible by one or more of the data access technologies.

Search Export Only: Search Export's default behavior is to automatically open and process the contents of an archive. Use DAOpenTreeRecord and SCCOPT_XML_SEARCHML_FLAGS to change the default behavior if discrete processing of each document in an archive is desired.

DAERR DAOpenTreeRecord(
      VTHDOC      hDoc,
      VTLPHDOC    lphDoc,
      VTDWORD     dwRecord);

lphDoc is not a file handle.

Parameters

• hDoc: Identifier of open document. May be a VTHDOC returned by the DAOpenDocument function, or the subhandle returned by the DAOpenDocument or DAOpenTreeRecord functions (VTHCONTENT, VTHTEXT, etc.).

• lphDoc: Pointer to a handle that is filled with a value uniquely identifying the document to data access. The developer uses this handle in subsequent calls to data access to identify this particular document.

• dwRecord: The record in the archive file to be opened.

Return Value

• DAERR_OK: Returned if DAOpenTreeRecord was successful. Otherwise, one of the other DAERR_ values in sccda.h or one of the SCCERR_ values in sccerr.h is returned.

6.17 DASaveTreeRecord

This function is called to extract a record in an archive file to disk.

DAERR DASaveTreeRecord(
      VTHDOC      hDoc,
      VTDWORD     dwRecord,
      VTDWORD     dwSpecType,
      VTLPVOID    pSpec,
      VTDWORD     dwFlags);

Parameters

• hDoc: Handle that uniquely identifies the document to data access. This is not an operating system file handle.

• dwRecord: The record in the archive file to be extracted.

• dwSpecType: Describes the contents of pSpec. Together, dwSpecType and pSpec describe the location of the source file to which the file will be extracted. Must be one of the following values:

  • IOTYPE_ANSIPATH: Windows only. pSpec points to a NULL-terminated full path name using the ANSI character set and FAT 8.3 (Win16) or NTFS (Win32 and Win64) filename conventions.

  • IOTYPE_REDIRECT: Specifies that redirected I/O will be used to save the file.

  • IOTYPE_UNICODEPATH: Windows only. pSpec points to a NULL-terminated full path name using the Unicode character set and NTFS (Win32 and Win64) file name conventions.

  • IOTYPE_UNIXPATH: UNIX platforms only. pSpec points to a NULL-terminated full path name using the system default character set and UNIX path conventions. Unicode paths can be accessed on UNIX platforms by using a UTF-8 encoded path with IOTYPE_UNIXPATH.

• pSpec: File location specification. See the descriptions for individual dwSpecType values.

• dwFlags: Currently not used. Should be set to 0.

Return Values

• DAERR_OK: Returned if the save was successful. Otherwise, one of the other DAERR_ values in sccda.h or one of the SCCERR_ values in sccerr.h is returned.

• DAERR_UNSUPPORTEDCOMP: Unsupported Compression Encountered.

• DAERR_PROTECTEDFILE: The file is encrypted.

• DAERR_BADPARAM: The request option is invalid. The record is possibly a directory.

Currently, only extracting a single file is supported. There is a known limitation where files in a Microsoft Binder file cannot be extracted.

6.18 DACloseTreeRecord

This function is called to close an open record file handle.

Search Export Only: Search Export's default behavior is to automatically open and process the contents of an archive. Use DACloseTreeRecord and SCCOPT_XML_SEARCHML_FLAGS to change the default behavior if discrete processing of each document in an archive is desired.

DAERR DACloseTreeRecord(
      VTHDOC      hDoc);

Parameters

• hDoc: Identifier of open record document.

Return Value

• DAERR_OK: Returned if DACloseTreeRecord was successful. Otherwise, one of the other DAERR_ values in sccda.h or one of the SCCERR_ values in sccerr.h is returned.

6.19 DASetStatCallback

This function sets up a callback that the technology periodically calls to verify the file is still being processed. The customer can use this with a monitoring process to help identify files that may be hung. Because this function is called more frequently than other callbacks, it is implemented as a separate function.

Use of the Status Callback Function

An application's status callback function will be called periodically by Outside In to provide a status message. Currently, the only status message defined is OIT_STATUS_WORKING, which provides a "sign of life" that can be used during unusually long processing operations to verify that Outside In has not stopped working. If the application decides that it would not like to continue processing the current document, it may use the return value from this function to tell Outside In to abort.

The status callback function has two return values defined:

• OIT_STATUS_CONTINUE: Tells Outside In to continue processing the current document.

• OIT_STATUS_ABORT: Tells Outside In to stop processing the current document.

The following is an example of a minimal status callback function.

VTDWORD MyStatusCallback( VTHANDLE hUnique, VTDWORD dwID, VTSYSVAL
pCallbackData, VTSYSVAL pAppData)
{
    if(dwID == OIT_STATUS_WORKING)
    {
        if( checkNeedToAbort( pAppData ) )
            return (OIT_STATUS_ABORT);
    }
  
    return (OIT_STATUS_CONTINUE);
}

Prototype

DAERR DASetStatCallback(DASTATCALLBACKFN pCallback, 
   VTHANDLE hUnique, 
   VTLPVOID pAppData)

Parameters

• pCallback: Pointer to the callback function.

• hUnique: Handle that may either be an hDoc or an hExport.

• pAppData: User-defined data. Outside In never uses this value other than to provide it to the callback function.

The callback function should be of type DASTATCALLBACKFN. This function has the following signature:

(VTHANDLE hUnique, VTDWORD dwID, VTSYSVAL pCallbackData, VTSYSVAL pAppData)

• hUnique: Handle that may either be an hDoc or an hExport

• dwID: Handle that indicates the callback status.

  • OIT_STATUS_WORKING

  • OIT_STATUS_CONTINUE

  • OIT_STATUS_CANCEL

  • OIT_STATUS_ABORT

• pCallbackData: Currently always NULL

• pAppData: User-defined data provided to DASetStatCallback

Return Values

• DAERR_OK: If successful. Otherwise, one of the other DAERR_ values in sccda.h or one of the SCCERR_ values in sccerr.h is returned.

6.20 DASetFileAccessCallback

This function sets up a callback that the technology will call into to request information required to open an input file. This information may be the password of the file or a support file location.

Use of the File Access Callback

When the technology encounters a file that requires additional information to access its contents, the application's callback function will be called for this information. Currently, only two different forms of information will be requested: the password of a document, or the file used by Lotus Notes to authenticate the user information.

The status callback function has two return values defined:

• SCCERR_OK: Tells Outside In that the requested information is provided.

• SCCERR_CANCEL: Tells Outside In that the requested information is not available.

This function will be repeatedly called if the information provided is not valid (such as the wrong password). It is the responsibility of the application to provide the correct information or return SCCERR_CANCEL.

Prototype

DAERR DASetFileAccessCallback (DAFILEACCESSCALLBACKFN pCallback);
   VTHANDLE hUnique, 
   VTLPVOID pAppData)

Parameters

• pCallback: Pointer to the callback function.

Return Values

• DAERR_OK: If successful. Otherwise, one of the other DAERR_ values defined in sccda.h or one of the SCCERR_ values in sccerr.h is returned.

The callback function should be of type DAFILEACCESSCALLBACKFN. This function has the following signature:

typedef VTDWORD (* DAFILEACCESSCALLBACKFN)(VTDWORD dwID, VTSYSVAL pRequestData, VTSYSVAL pReturnData, VTDWORD dwReturnDataSize);

• dwID – ID of information requested:

  • OIT_FILEACCESS_PASSWORD – Requesting the password of the file

  • OIT_FILEACCESS_NOTESID – Requesting the Notes ID file location

• pRequestData – Information about the file.

  typedef struct {
        VTDWORD   dwSize;           /* size of this structure */
        VTWORD    wFIId;            /* FI id of reference file */
        VTDWORD   dwSpecType;       /* file spec type */
        VTVOID   *pSpec;            /* pointer to a file spec */
        VTDWORD   dwRootSpecType;   /* root file spec type */
        VTVOID   *pRootSpec;        /* pointer to the root file spec */
        VTDWORD   dwAttemptNumber;  /* The number of times the callback has */
                                    /* already been called for the currently */
                                    /* requested item of information */
  } IOREQUESTDATA, * PIOREQUESTDATA;
  

• pReturnData – Pointer to the buffer to hold the requested information – for OIT_FILEACCESS_PASSWORD and OIT_FILEACCESS_NOTESID, the buffer is an array of WORD characters.

• dwReturnDataSize – Size of the return buffer.