VC通过函数索引调用DLL范例

EXPORTS
GetDefaultPrinterName @1

#include <iostream>
#include<windows.h>
#include<string>
using namespace std;
#define PRINT_DLL_NAME        L"Printer.dll"
#define FUNCTION_INDEX 1
#define FUNCTION_NAME(i) (LPCSTR)MAKEINTRESOURCE(i)
typedef void(WINAPI *TestFunction)(char*);
int main()
{
    HINSTANCE hDLL = LoadLibrary(PRINT_DLL_NAME);
  if (hDLL == NULL)
  {
      cout << PRINT_DLL_NAME << " ERROR: " << hDLL << endl;
    return -1;
  }
    TestFunction function=(TestFunction)GetProcAddress(hDLL, FUNCTION_NAME(FUNCTION_INDEX));
    if (function == NULL)
    {
      cout << FUNCTION_INDEX << " ERROR:" << function << endl;
    return -1;
    }
  char name[256] = {0};
    function(name);
    cout<<"RESULT="<< name << endl;
    FreeLibrary(hDLL);
    return 0;
}