_CP_read is equivalent to the read, readu and readu locked BASIC statements (depending upon type):
| Type | BASIC Statement |
|---|---|
| _CP_READ | read result from expression,string |
| _CP_READU | readu result from expression,string |
| _CP_READUL | readu result from expression,string locked value = 0 else value = 1 If value is not needed, the user can pass (int*) 0. |
int _CP_read(int type, CPSTR** result, int expression, CPSTR* string, int* value)
The _CP_read call uses the same optimized read routine as BASIC, which is faster than using AQL and BASIC. The expression should be an integer file descriptor returned by the _CP_open call.
This function returns -1 if an error occurs. The error code is contained in _CP_errno.
/* Reads the item "myid"from "myfile". */
CPSTR * s = _CP_mkstr("myfile");
CPSTR * id = _CP_mkstr("myid");
CPSTR * xx = _CP_str_null;
int f;
_CP_open(&f,_CP_str_null,s);
_CP_read(_CP_READ, &xx, f, id, 0);