diff --git a/ManagerDbfGdataTable.cpp b/ManagerDbfGdataTable.cpp
index 3ada239..dff64a8 100644
--- a/ManagerDbfGdataTable.cpp
+++ b/ManagerDbfGdataTable.cpp
@@ -37,6 +37,9 @@ bool ManagerDbfGdataTable::AddCol( char* path, char* name, BYTE type,IAddColDbf
 			return false;
 		ic=tb.nColm()-1;
 	}
+
+	dt->size = tb.getSize(ic);
+
 	for(int i=0;i<tb.nRow();i++)
 	{
 		dt->setData(i, tb.get(i,ic));		
diff --git a/ManagerDbfGdataTable.h b/ManagerDbfGdataTable.h
index 020c3bb..0f55e8f 100644
--- a/ManagerDbfGdataTable.h
+++ b/ManagerDbfGdataTable.h
@@ -9,6 +9,7 @@
 class IAddColDbf
 {
 public:
+	int size = 0;
 	virtual void setData(int i, void *data)=0;
 };
 class GdataTable;