C: Initialize - LoadLibrary and GetProcAddress

The first step to using the RPC Broker 32-bit DLL in a C program is to load the DLL and get the process addresses for the exported functions.

To initialize access to the Broker DLL functions:

1. Use the Windows API LoadLibrary function to load the DLL.

   HINSTANCE hLib = LoadLibrary("bapi32.dll");
   if((unsigned)hLib<=HINSTANCE_ERROR)
   {
      /* add your error handler for case where library fails to load */
      return 1;
   }

2. If you successfully load the DLL, map function pointers to the addresses of the functions in the DLL that you need for your application.

   RPCBCreate = (void *(__stdcall*)()) GetProcAddress(hLib, "RpcbCreate");
   RPCBFree = (void (__stdcall*)(void *)) GetProcAddress(hLib, "RpcbFree");
   RPCBCall = (char *(__stdcall*)(void *, char *)) GetProcAddress(hLib, "RpcbCall");
   RPCBCreateContext = (bool (__stdcall*)(void *, char *)) GetProcAddress(hLib, "RpcbCreateContext");
   RPCBMultSet = (void (__stdcall*)(void *, int, char *, char *)) GetProcAddress(hLib, "RpcbMultSet");
   RPCBParamGet = (void (__stdcall*)(void *, int, int, char *)) GetProcAddress(hLib, "RpcbParamGet");
   RPCBParamSet = (void (__stdcall*)(void *, int, int, char *)) GetProcAddress(hLib, "RpcbParamSet");
   RPCBPropGet = (void (__stdcall*)(void *, char *, char *)) GetProcAddress(hLib, "RpcbPropGet");
   RPCBPropSet =(void (__stdcall*)(void *, char *, char *)) GetProcAddress(hLib, "RpcbPropSet");
   //
   // GetProcAddress returns null on failure
   //
   if( RPCBCreate == NULL || RPCBFree == NULL || RPCBCall == NULL || RPCBCreateContext == NULL
      || RPCBMultSet == NULL || RPCBParamGet == NULL || RPCBParamSet == NULL || RPCBPropGet == NULL
      || RPCBPropSet == NULL)
   {
   /* add your error handler for case where functions are not found */
      return 1;
   }

Now you can use functions exported in the DLL.