Quick Wimp question

Hi all,

When a file is dragged onto an application from the filer and dealt with as per this snippet of code:

SYS “Wimp_Poll”,0,block% TO event%
CASE event% OF
…
WHEN 17,18:PROCmessage
…
ENDCASE
ENDPROC

DEF PROCmessage
CASE block%!16 OF
WHEN 1:PROCreceive
…
ENDCASE
ENDPROC

DEF PROCreceive
size%=block%!36
…

why is size% reported as -1? The PRMs mention that block%!36 gives the (estimated) size of the incoming data so not sure what -1 means. I’m perhaps missing something obvious or do I need an extra line or two of code before the true size% is given?

Thanks :)
Chris.

I should P.S. that I’ve got what I’ve needed by using an OS_File call to get the file’s size but I’m still puzzled by the above behaviour.

I think -1 means that the sender does not know the file’s size.

The information is of dubious trustworthiness at the best of times.

DEF PROCmessage
CASE block%!16 OF
WHEN 1:PROCreceive
…
ENDCASE
ENDPROC

Are you sure that’s correct? The Filer will send Message_DataLoad, which is 3; 1 is Message_DataSave, which would be an app-to-app or app-to-Filer transfer.

Yes sorry Steve you are quite correct, I showed the wrong bit of my code and it should be WHEN 3:PROCreceive instead of WHEN 1:PROCreceive.

App-to-app transfer does give a proper estimated file size at block%!36

but filer-to-app doesn’t, it returns -1