User`s guide

Optimizing Agilent VEE Programs Chapter 12
VEE User’s Guide 455
VEE automatically configures the Call object with the
function name, and the proper number of input and output
pins. The second, third... output pins map to any parameters
passed by reference to the function. If you have entered the
function name, you can also configure the object by selecting
Configure Pinout in the object menu.
3 (Optional) Click Device ⇒ Delete Library.
While developing the program, you can also select Delete Lib
from the object menu to delete the library programmatically.
Deleting the library after it has been used in the program
reduces load time and conserves memory.
An Example Using a DLL
In this exercise, you will import a DLL and call a function from
the DLL. The DLL used is included with the VEE product on
Windows. (The same program is designed to work on all
platforms.)
Open the manual49.vee file. It is located under:
<installation directory>\EXAMPLES\MANUAL\MANUAL49.
Examine this example closely. It should look like Figure 259.
NOTE
You can also call a DLL function from an expression field, provided the
library has been loaded. When used in this way, you must enclose the
parameters in parentheses after the function name, and the function only
sends back its return value. Any parameters passed by reference can only
be retrieved by using the Call object. For example, you might use the
following expression in a Formula object:
2 * yourFunc(a,b)
The a and the b would refer to two input pins on the Formula object, and
the return value of yourFunc would be multiplied by 2 and placed on the
output pin.