PickBASIC / FlashBASIC

%popen() function

The %popen() function creates a pipe between the calling process and the command to be executed.

Syntax

pointer = (char*)%popen(command, type)

Parameter(s)


`pointer`	Stream pointer that directs a write to the standard input of the command if the I/O mode is `w`, and reads from the standard output of the command if the type is `r`.
`command`	Shell command line.
`type`	I/O mode.
	r	Reading
	w	Writing

Description

A stream opened by %popen() must be closed by %pclose(). The stream is closed automatically at FlashBASIC program termination.

Example(s)

include dm,bp,includes sysid.inc
cfunction unix.builtin
char buffer[128]
if system(38)<sys$imp> = sys$win then
   cmd = "dir"
end else
   cmd = "ls -l"
end
ptr=(char*)%popen(cmd,"r")
if ptr=0 then crt "error" ; stop
loop
   n=(char*)%fgets(buffer,128,(char*)ptr)
   while n # 0 do
   print field(buffer,char(0),1)
repeat
%pclose((char*)ptr)

This example executes a UNIX command, capturing the result.

See also

%fgets() function→%fputs() function→%pclose() function→FlashBASIC C functions overview→cfunction statement→execute statement (UNIX)→