P_ENV

Syntax P_ENV (#ch)
Location MULTI

This function detects whether the given channel is running under the Pointer Environment and returns:

  • 0 if the Pointer Environment is not connected to that channel, or no parameter was used, or #ch is not a screen channel;
  • 1 if the Pointer Interface (ptr_gen) is active in that channel;
  • 2 if the Pointer Interface and the Window Manager (wman) are present for that channel.

Example

All programs which need the Pointer Environment to work, should check to see if it is present. This short program does so:

100 ch=FOPEN(con_2x2a0x0): p=P_ENV(#ch): CLOSE#ch
110 IF p<2 THEN
120   PRINT "This program does not run without the P.E.,"
130   PRINT "so program execution has to stop here."
140   PRINT " Press any key...": PAUSE 400
150   STOP
160 END IF

CROSS-REFERENCE

WMAN$ finds the version of the Window Manager and QRAM$ the version of the Pointer Interface. These functions can also be used to detect the presence of the Pointer Environment (=Window Manager & Pointer Interface).