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Thread: Loading DLL to Excel VBA macro

  1. #1

    Thread Starter
    New Member
    Join Date
    Sep 2018

    Loading DLL to Excel VBA macro

    I am trying to integrate a DLL that has provided me with a supplier in a macro of calculation and selection of components.

    The way to load the DLL is (the Start Job function is one that needs to be called and its input and output variables are predefined):

    Public Declare PtrSafe Function StartJob Lib "C: \ Users \ Carlos \ Desktop \ DLL_Calculo_Componentes \ calcdll.dll" (ByRef p1 as double, ByRef p2 as variant, ByRef p3 as variant) As Boolean

    But when I try to run, I get the following errors, depending on whether you enter the full path or just the name of the DLL:

    - Error '48' occurred at runtime: Error loading DLL library
    - Error '53' occurred at runtime: File not found

    I have already reviewed the path indicated in the declare statement and it is the correct one, and the dll is in that folder.
    The dll is in the same directory as the macro that uses it.
    I use the "ptrsafe" instruction because my system is in 64 bits.
    It does not allow loading the DLL through "tools -> references".

    Why is there an error?
    What is another way to load the DLL?

    Thank you very much for the help.

  2. #2
    Join Date
    Dec 2004

    Re: Loading DLL to Excel VBA macro

    with the arguments being passed to the function, looks like 32 bit API, so may not work with 64 bit excel
    i would suggest contacting the people who supplied the dll, for better information
    i do my best to test code works before i post it, but sometimes am unable to do so for some reason, and usually say so if this is the case.
    Note code snippets posted are just that and do not include error handling that is required in real world applications, but avoid On Error Resume Next

    dim all variables as required as often i have done so elsewhere in my code but only posted the relevant part

    come back and mark your original post as resolved if your problem is fixed

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