구차니의 잡동사니 모음

#include <stdio.h>

#include <dlfcn.h>

#include "ctest.h"

int main(int argc, char **argv) 

{

   void *lib_handle;

   double (*fn)(int *);

   int x;

   char *error;

   lib_handle = dlopen("/opt/lib/libctest.so", RTLD_LAZY);

   if (!lib_handle) 

   {

      fprintf(stderr, "%s\n", dlerror());

      exit(1);

   }

   fn = dlsym(lib_handle, "ctest1");

   if ((error = dlerror()) != NULL)  

   {

      fprintf(stderr, "%s\n", error);

      exit(1);

   }

   (*fn)(&x);

   printf("Valx=%d\n",x);

   dlclose(lib_handle);

   return 0;

} 

    hInst = LoadLibrary("SmallDll.dll");

    if(hInst == NULL)

        return 1;

    // 호출한 함수를 맵핑

    fAPlusB = (APlusB)GetProcAddress(hInst, "APlusB");

    fAMinusB = (AMinusB)GetProcAddress(hInst, "AMinusB"); 

HMODULE WINAPI LoadLibrary(

  _In_ LPCTSTR lpFileName

);

FARPROC WINAPI GetProcAddress(

  _In_ HMODULE hModule,

  _In_ LPCSTR  lpProcName

);

// MathFuncsDll.h

#ifdef MATHFUNCSDLL_EXPORTS

#define MATHFUNCSDLL_API __declspec(dllexport) 

#else

#define MATHFUNCSDLL_API __declspec(dllimport) 

#endif

// MyExecRefsDll.cpp

// compile with: /EHsc /link MathFuncsDll.lib 

char *dtostrf(double val, signed char width, unsigned char prec, char *s)

Use this method to convert it to a C-Style string and then use sprintf, eg:

char str_temp[6];

/* 4 is mininum width, 2 is precision; float value is copied onto str_temp*/

dtostrf(temp, 4, 2, str_temp);

sprintf(temperature,"%s F", str_temp);