How to call program written in c++ call my DLL written in c -


i have developped dll in c , have called in c++ program method

#include <cstdlib> #include <iostream> #include <windows.h>  #ifdef __cplusplus extern "c" { #endif #include "mydll.h" #ifdef __cplusplus } #endif using namespace std;  int main(int argc, char *argv[]) {     struct myown_struct *ss = null;     int = 0,j = 0, result = 0;     struct myown_struct2 *s = null;     myfunction("string1", "string2", "string3", 1500);     system("pause");     return exit_success; }

mydll.h :

#ifndef _dll_h_ #define _dll_h_  #if building_dll # define dllimport __declspec (dllexport) #else /* not building_dll */ # define dllimport __declspec (dllimport) #endif /* not building_dll */  struct myown_struct {   int fd;   char buf[32];   unsigned int len; } __attribute__((packed));  dllimport void myfunction(char *s1, char* s2, char *s3, int n);  #endif /* _dll_h_ */

i error :

c:\users\user01\desktop\test\main.cpp in function int main(int, char**) c:\users\user01\desktop\test\main.cpp myfunction' undeclared (first use function)

how can fix it?

your header file mydll.h appears missing declaration of myfunction. correct omission , code compile.

on top of need ensure that:

  • the .lib import library created when compiled dll passed linker when link c++ program.
  • the dll can found when attempt run program. best achieved placing dll in same directory executable.

i comment expect see extern "c" in header file rather forcing every single user of header file write extern "c". header file should stand alone.


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