Excel error linking C++: "A value used in the formula is of the wrong data type" -

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i wrote simple c++ program

source.cpp:

double __stdcall square(double& x) {     return x*x; }

define.def:

library "square"  exports square

then in .xlsm file modules, added module1 imporing:

declare ptrsafe function square _ lib "c:\users\user\documents\athoscode\marek kolman square\square\debug\square.dll" _ (byref x double) double

and in sheet1, put 10 in a1, , =square(a1) in b1.

the error says: "a value used in formula of wrong data type".

what's problem , how fix it?

my environment - windows 7 64-bits - visual studio 2016 community (so it's 32-bits) - excel 2016 64-bits

replying comment, if change passing reference passing value, error same.

i changed source.cpp to

double __stdcall square(double x) {     return x*x; }

and changed module1 as

declare ptrsafe function square _ lib "c:\users\user\documents\athoscode\marek kolman square\square\debug\square.dll" _ (byval x double) double

same error.

due differences in architecture, it's impossible load 32-bit dll in 64-bit process , vice versa

it's possible access 32-bit dlls 64-bit code unless have legacy dlls without 64-bit version, should compile 64-bit project. , 64-bit office doesn't support 32-bit plugin @ all you'll need 64-bit dll.


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