Information about varying-length data

Varying-length information	DataBlade API accessor function
Length of varying-length data	mi_get_varlen()
Data portion	mi_lvarchar_to_string(), mi_var_to_buffer(), mi_var_copy()
Data pointer	mi_get_vardata(), mi_get_vardata_align()

Obtain the data length
The mi_get_varlen() function returns the data length from a varying-length descriptor.

Obtain data as a null-terminated string
The mi_lvarchar_to_string() function obtains the data from a varying-length structure and converts it to a null-terminated string.

Copy data into a user-allocated buffer
The mi_var_to_buffer() function copies the data of an existing varying-length structure into a user-allocated buffer. The function copies data up to the data length specified in the varying-length descriptor. You can obtain the current data length with the mi_get_varlen() function.

Copy data into a new varying-length structure
The mi_var_copy() function copies data from an existing varying-length structure into a new varying-length structure.

Obtain the data pointer
The mi_get_vardata() and mi_get_vardata_align() functions obtain the actual data pointer from the varying-length descriptor. Through this data pointer, you can directly access the varying-length data.