What do I describe code of loading dynamic dll by C++/CX?

Question

Hello! I learn describing code of loading dynamic dll by C++/CX. What do I describe code of loading dynamic dll by C++/CX? Please describe sample code.

Answer 1

Hi @nippy ,

UWP C++/CX can load win32 and UWP dynamic DLL. Here are my test steps:

DLL(Win32 or UWP)

1. Create DLL project, name "DllTest".
2. Add extern "C" content in "Pch,h".

extern "C"
{    
   _declspec(dllexport) void mainDll(double a, double b, double* aplusb);
}

3. Add function content in "Pch.cpp".

#include "pch.h"
void mainDll(double a, double b, double* aplusb)
{    
  *aplusb = a + b;
}

4. Rebuild the project, find the dll file in output file, copy it to the AppX file of UWP project. It is recommended to modify the Output Directory.

UWP(C++/CX):

1. Create UWP C++/CX project, its name is App2.
2. Add code about calling the dll.

HINSTANCE hDLL = LoadLibrary(L"DllTest.dll"); 
typedef void (*func)(double a, double b, double* aplusb); 
func callDll = (func)GetProcAddress(hDLL, "mainDll"); 
double a = 1, b = 2, result;
callDll(a, b, &result);

3. Check the value of result, it should be 3.

Thank you.

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