6570 add function in VB DLL

[zquan452199]

Hope to add a new function in VB 6570 DLL,detail information as follow

Public Declare Function niDigital_GetTimeSetPeriod Lib "C:\Program Files (X86)\IVI Foundation\IVI\Bin\niDigital_32.dll" ( _

   ByVal vi As Long, _

   ByVal Timeset As String, _

   ByVal period As Double) As long

but run with error "Bad DLL calling convention"? why ?

[dug9000 · Accepted solution]

I'm not super familiar with how to call C functions from VB6, but this function is stdcall. One thing that looks incorrect though with what you have is that the period argument should not be ByVal. It's an output parameter.