BLOBDirectPut Function |  |
Put data in a BLOB file without referencing a specific field.
Namespace: XSharp.RT
Assembly: XSharp.RT (in XSharp.RT.dll) Version: 2.21
SyntaxRequest Example
View Source
A numeric pointer to the uBLOB data.
Parameters
- nOldPointer (Optional)
- Type: Usual
A reference to previously stored BLOB data.
This reference can be obtained using BLOBDirectPut(), BLOBDirectImport(), or DBFieldInfo(DBS_BLOB_POINTER, nFieldPos).
If other than 0, the data referenced by nOldPointer is replaced by uBLOB; otherwise, uBLOB is added to the current contents of the BLOB file.
Important!
If specified, BLOBDirectPut() releases the space associated with nOldPointer for reuse by other data.
Therefore, it is illegal to use nOldPointer with any of the BLOB functions after passing it as an argument to this function.
Use the function's return value to refer to the newly stored data. - uBlob (Optional)
- Type: Usual
Return Value
Type: UsualA numeric pointer to the uBLOB data.
Remarks
BLOBDirectPut() stores variable length BLOB data without creating a link with a particular memo field in a database file.
After adding data to a BLOB file using BLOBDirectPut(), you should store the function's return value, as this is the only way to access the data from the BLOB file.
It is up to you, the developer, to provide permanent storage for this reference (see BLOBRootPut()). By default, this function operates on the currently selected work area.
It can be made to operate on an unselected work area by specifying it within an aliased expression
It is up to you, the developer, to provide permanent storage for this reference (see BLOBRootPut()). By default, this function operates on the currently selected work area.
It can be made to operate on an unselected work area by specifying it within an aliased expression
Examples
This example illustrates storing setup information in a BLOB file, then selectively retrieving the stored information:
X#
1FUNCTION PutSettings(aColors AS ARRAY,; 2 aPaths AS ARRAY, aPassWords AS ARRAY) AS VOID 3LOCAL aSettings AS ARRAY 4 USE setup NEW VIA DBFBLOB 5 aSettings := {} 6 AADD(aSettings, BLOBDirectPut(0, aColors)) 7 AADD(aSettings, BLOBDirectPut(0, aPaths)) 8 AADD(aSettings, BLOBDirectPut(0, aPassWords)) 9 BLOBRootPut(aSettings) 10 CLOSE 11FUNCTION GetColors() AS ARRAY 12 LOCAL aSettings AS ARRAY 13 LOCAL aColors AS ARRAY 14 USE setup NEW VIA DBFBLOB 15 aSettings := BLOBRootGet() 16 aColors := BLOBDirectGet(aSettings[1]) 17 CLOSE 18 RETURN aColors
See Also