bcp_colptr
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
Sets the program variable data address for the current copy into SQL Server.
Syntax
RETCODE bcp_colptr (
HDBC hdbc,
LPCBYTE pData,
INT idxServerCol);
Arguments
hdbc
Is the bulk copy-enabled ODBC connection handle.
pData
Is a pointer to the data to copy. If the bound data type is large value type (such as SQLTEXT or SQLIMAGE), pData can be NULL. A NULL pData indicates long data values will be sent to SQL Server in chunks using bcp_moretext.
If pData is set to NULL and the column corresponding to the bound field is not a large value type, bcp_colptr fails.
For more information on large value types, see bcp_bind.
idxServerCol
Is the ordinal position of the column in the database table to which the data is copied. The first column in a table is column 1. The ordinal position of a column is reported by SQLColumns.
Returns
SUCCEED or FAIL.
Remarks
The bcp_colptr function allows you to change the address of source data for a particular column when copying data to SQL Server with bcp_sendrow.
Initially, the pointer to user data is set by a call to bcp_bind. If the program variable data address changes between calls to bcp_sendrow, you can call bcp_colptr to reset the pointer to the data. The next call to bcp_sendrow sends the data addressed by the call to bcp_colptr.
There must be a separate bcp_colptr call for every column in the table whose data address you want to modify.