Compaq TP DESKTOP CONNECTOR AAPVNFGTE - Manual (Page 13)

Table 1–2 (Cont.) Parameter Data Types
Data Type Description
longword 32-bit unsigned integer
ptr Longword pointer to data buffer
short Synonym for short int
short int 16-bit signed integer
unsigned long int 32-bit unsigned integer
void * Pointer to object of unknown type
1.3.2 Access
Access describes the way in which the called routine accesses the data specified
by the parameter. The access methods are described in Table 1–3.
Table 1–3 Called Routine Access Methods
Access Method Description
Read Data needed by the called routine to perform its operation is read
but not returned.
Write Data that the called routine returns to the calling routine is written
into a location accessible to the calling routine.
Modify Data is both read and returned by the called routine; input data
specified by the parameter is overwritten.
1.3.3 Mechanism
The parameter-passing mechanism is the way in which a parameter specifies
the data to be used by the called routine. The passing mechanisms are
described in Table 1–4.
Service Format 1–3