Copy an object handle.
MCO_RET mco_copy_handle( /*IN*/ mco_db_h db,
/*OUT*/ MCO_Hf * dst,
/*IN*/ MCO_Hf * src );
| db | The database handle |
|
dst |
The address of an object handle to receive the copy |
|
src |
The address of the object handle to copy |
Because object handles cannot be copied as a raw sequence of bytes (using
memcpy()for example), this function is provided for rare occasions when it might be useful to copy an object handle.
| MCO_S_OK | The object handle was successfully copied |
Application snippet: const char * dbname = "SimpleDb"; int main(int argc, char* argv[]) { mco_db_h db; MCO_RET rc; mco_device_t dev; mco_db_params_t db_params; mco_trans_h t; ... if( (rc = mco_runtime_start()) != MCO_S_OK) exit(-1); rc = mco_db_open_dev( dbname, simpledb_get_dictionary(), &dev, 1, &db_params ); if ( MCO_S_OK != rc ) { rc = mco_db_connect( dbname, &db ); ... // Instantiate an object of class A and get its class code rc = mco_trans_start(db, MCO_READ_WRITE, MCO_TRANS_FOREGROUND, &t); if ( MCO_S_OK == rc ) { A a; /* Object handle */ uint2 code; rc = A_new ( t, &a ); rc = mco_trans_commit( t ); A a2; rc = mco_copy_handle( db, &a2, &a ); } } }