UDP close causing error #1

[Kreuters]

hey

i have written a simple VI to stream data acquired from a DAQ card over a network using UDP packets. it is working fine, but when i terminate the program the UDP Close VI is causing error #1 to occur. does anyone know how i can solve this problem?

i have attached a gif of most of the block diagram.

[Ben]

Try replacing the tunnels that bring the UDP conncetion reference in and out of the For loop in the bottom loop with a shift register.

If the For loop iterates "zero" times the contents of its output tunnel will be the default value.

That would in turn pass a null refnum to the close.

Trying to help,

Ben

[altenbach]

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@Ben wrote:

Try replacing the tunnels that bring the UDP conncetion reference in and out of the For loop in the bottom loop with a shift register.

If the For loop iterates "zero" times the contents of its output tunnel will be the default value.

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Just to clarify what Ben just said:

1. Using Tunnel (your code): If the FOR loop iteration count is zero, the UDP reference output from the loop is reset to default.
2. Using Shift register:  If the FOR loop iteration count is zero, the UDP reference is output unchanged from the shift register input and is thus valid.