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6570 add function in VB DLL

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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 ?

 

 


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