BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) { return TRUE; }
// gdpfile.c #include <windows.h> #include <stdio.h> #include "gdpfile.h" static char last_error_msg[256];
DLL_API int read_gdp_file(const char* filename, double* data, int max_size) { // Your GDP file reading logic here return 0; // return number of values read } gdpfile.dll
Compile with:
DLL_API int write_gdp_file(const char* filename, const double* data, int count) { // Write GDP data to custom file format return 1; // success } BOOL WINAPI DllMain(HINSTANCE hinstDLL
DLL_API const char* get_last_error(void) { return last_error_msg; }
And the implementation:
cl /LD /DEXPORTING_DLL gdpfile.c /Fe:gdpfile.dll so I can give you a precise, working implementation for your feature.
// gdpfile.h #ifdef EXPORTING_DLL #define DLL_API __declspec(dllexport) #else #define DLL_API __declspec(dllimport) #endif DLL_API int read_gdp_file(const char* filename, double* data, int max_size); DLL_API int write_gdp_file(const char* filename, const double* data, int count); DLL_API const char* get_last_error(void); LPVOID lpvReserved) { return TRUE