IBCPSession::BCPWriteFmt (Native Client OLE DB Provider)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
Important
The SQL Server Native Client (often abbreviated SNAC) has been removed from SQL Server 2022 (16.x) and SQL Server Management Studio 19 (SSMS). Both the SQL Server Native Client OLE DB provider (SQLNCLI or SQLNCLI11) and the legacy Microsoft OLE DB Provider for SQL Server (SQLOLEDB) are not recommended for new development. Switch to the new Microsoft OLE DB Driver (MSOLEDBSQL) for SQL Server going forward.
Writes format information for each column to the format file.
Syntax
HRESULT BCPWriteFmt(
const wchar_t *pwszFormatFile);
Remarks
The format file specifies the data format of a data file created by bulk copy. Calls to the IBCPSession::BCPColumns and IBCPSession::BCPColFmt methods define the format of the data file. The BCPWriteFmt method saves this definition in the file referenced by the pwszFormatFile argument.
The BCPWriteFmt method can save the format files in either xml or text format. This must be indicated by using the BCP_OPTION_XML control option with the IBCPSession::BCPControl method.
To load a saved format file, use the IBCPSession::BCPReadFmt method.
Arguments
pwszFormatFile[in]
The path and file name of the file containing the format values for the data file.
Return Code Values
S_OK
The method succeeded.
E_FAIL
A provider-specific error occurred; for detailed information, use the ISQLServerErrorInfo interface.
E_OUTOFMEMORY
Out-of-memory error.
E_UNEXPECTED
The call to the method was unexpected. For example, the IBCPSession::BCPInit method was not called before calling this method.