Sample Code (in VB) for your reference:

• Extract specific block data  from a DWG file

set obj = CreateObject("AutoAttX.ExAtt")

obj.GetAttByBlkName "version1.dwg", "Title Block" 'get drawing att data , input drawing file name and block name 

• Extract Data  By Tag

set obj = CreateObject("AutoAttX.ExAtt")

obj.SetInputDWG "version1.dwg"

obj.GetValueByTag "TITLE"

• Extract data to CSV

set obj = CreateObject("ModifiedAtt.Modify")

obj.GetAttDatatoFile "def.def", "test.dwg","Test.csv"

def.def should be edited with Block Name and Tags (Block Name, Tag1, Tag2)

• Modify data with extracted CSV

set obj = CreateObject("ModifiedAtt.Modify")

obj.WriteAttByFile "test.dwg","test.csv"

• Modify data with Block Name/Tags/Value

set obj = CreateObject("ModifiedAtt.Modify")
obj.DWGFile = "test.dwg"                              'drawing file
obj.SetAttValue "11blk", "111", "value112"     'block name, attribute tag, attribute value
obj.SetAttValue "11blk", "222", "value212"
obj.SetAttValue "22blk", "abc", "value312"
obj.SetAttValue "22blk", "abc1", "value412"
obj.ModifyAtt