cfunc.readv
Pick/BASIC 'readv' functionality from C.
Syntax
int _CP_readv(int type, CPSTR** result, int expression1, CPSTR* string, int expression2, int* value)
Description
equivalent to the Pick/BASIC statement: readv
Depending upon type, _CP_read acts as the following Pick/BASIC commands:
type Pick/BASIC statement
_CP_READV readv result from expression1, string, expression2
_CP_READVU readvu result from expression1, string, expression2
_CP_READVUL readvu result from expression, string, expression2
The value parameter returns a 1 if the item is locked.
If value is not needed, the user may pass (int*) 0.
The _CP_readv call uses the same optimized read routine as FlashBASIC which, from the 6.1 release onwards, is about 2-5 times faster than that which is used by Access and standard Pick/BASIC.
The expression1 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. If the attribute number is bad, then _CP_errno will contain PE_BADATTR.
Example
/* The following example reads the first attribute of 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_readv(_CP_READV, xx, f, id, 1, 0);
See Also
User Comments
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