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Thread: Interface EXCEL-VBA with C-Sharp or C++ DLL

  1. #1
    VBAX Newbie
    Jan 2018

    Post Interface EXCEL-VBA with C-Sharp or C++ DLL

    Hello Everyone,

    I am new in VBA and programming as well
    I am trying to connect/interface data placed in cells in Excel-VBA with C-sharp DLL or C++ DLL file. I have 2 DLL files. One is in C-Sharp and second one in C++.
    Basically, DLL file contains functions/equations, procedures, classes and etc. that are calculating output values based on input values.
    Main idea is to send Input values placed in EXCEL-VBA to DLL file, after that give command DLL to do calculation and finally return output values to excel cells again.

    Firstly, I have only tried to interface function stored in DLL, but it does not work.

    Here is code in VBA that should be able to interface with DLL:
    Private Declare Function cp Lib "C:\calc.dll" (x As Double) As Double

    Function cp_vba(x As Double) As Double

    cp_vba = cp(x)

    End Function

    Here is function writtten in C-Sharp, that should receive x value from Excel and return cp value to Excell as well:

    public static double cp(double x)
    if (x == -1.0)
    throw new DivideByZeroException("x");
    return (1000.0 + x * 1810.0) / (1.0 + x);

    Can someone help why If I insert input value x, the result of cp value is not received?
    I can see in excell cell #HODNOTA. See attachement as well.

    Any advice how to interface VBA with DLL?

    many thanks in advance,
    Attached Files Attached Files

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