Title: File Exist loop
Hi Stuart,
VB had a DoEvents construct that allows control to pass back to other
running processes, so one process doesn't hang the system. MapBasic
doesn't include that statement, unfortunately. A loop in MapBasic will
thus always be active.
And an active loop that queries for the existence of a file will hog
too many cpu cycles, and therefore it's not a good idea.
Besides, a file exist from when it's created, before it's ready to be
read, so there's also some syncronization issues to handle as well.
What you're doing is waiting for is an external program, so why not let
the external program itself tell the MapBasic app that the file is
ready ?
This is how a VB program would do that (oMIPro is the object reference
to MIPro) :
oMIPro.MBApplications("yourname.mbx").Do "I am ready to rock"
The MapBasic RemoteMsgHandler will be invoked, and
CommandInfo(CMD_INFO_MSG) will return the sent command string, here
it's "I am ready to rock".
HTH
Best regards / Med venlig hilsen
Lars I. Nielsen
GisPro
Gibb, Stuart wrote:
Hi all,
I have an external program which I
call from MI. The result of this is a text file being created which I
then read in for input into MI. Does anyone know how to tell MI to wait
until the external file has been created before trying to open it ?
I'm guessing I need a FileExists Loop
of some sorts but am banging my head against a wall to get it to work.
Many thanks for all your help
previously.
Stu
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