passing a filehandle to a function

Blitz3D Forums/Blitz3D Beginners Area/passing a filehandle to a function

DaxTraj

(Posted 2004) [#1]

I know in some other laguages I have to explicity declare the type of variable (string, int, float) I'll be passing to a function

In this case I wish to pass a filehandle to a function
eg. in this example "title_screen" is a filehandle

draw (title_screen)
end

;----------------------------------
Function draw (handle)

drawimage handle,0,0

End Function
;----------------------------------

My question is, is this code ok, or in the function do I have to declare handle as being some type of float or long int or something.

Ross C

(Posted 2004) [#2]

well, you'd say in the function the type of variable you want the passed across parameter to be.

Function draw(handle$)

But i think blitz might automatically do this. But you'd be as well doing it anyway, for clarity :)

ashmantle

(Posted 2004) [#3]

I think it will be ok, but you should declare it just to be on the safe side..

Function Myfunction(file_name$)
..blabla
End Function

soja	(Posted 2004) [#4]

In Blitz, handles are always integers. (There are only a few built-in types in Blitz anyway.)

Also, whenever a variable (or return type) is declared without specifically referencing the type, it is assumed by Blitz to be an integer. In other words, these examples are all the same:

Function draw(img)
    DrawImage img,0,0
End Function

Function draw%(img%)
    DrawImage img,0,0
End Function

Function draw%(img)
    DrawImage img%,0,0
End Function

Function draw(img)
    DrawImage img%,0,0
End Function

...etc

Dax Trajero

(Posted 2004) [#5]

ok great

my code has started to become buggy and I was trying to get to the bottom of it - I guess this isn't the source of the crashes then!