VC通过函数名调用DLL的标准范例

extern "C" __declspec(dllexport) void GetDefaultPrinterName(char* name);
extern "C" __declspec(dllexport) void GetDefaultPrinterName(char* name)
{
    //
}

#include <iostream>
#include<windows.h>
#include<string>
using namespace std;
#define TEST_DLL_PATH        "D:\\Office-5.0-project\\c\\windows-printer\\Debug\\TPrinter.dll"
#define TEST_FUNCTION_NAME   "GetDefaultPrinterName"
typedef void( *TestFunction)(char*);
int main()
{
  cout << "Start" << endl;
    HINSTANCE hDLL = LoadLibrary(TEST_DLL_PATH);
  if (hDLL == NULL)
  {
     cout << TEST_DLL_PATH << " ERROR: " << GetLastError() << endl;
  return -1;
  }
  cout << TEST_DLL_PATH << " " << hDLL << endl;
  TestFunction function=(TestFunction)GetProcAddress(hDLL,"GetDefaultPrinterName");
    if (function == NULL)
    {
     cout << TEST_DLL_PATH << " ERROR:" << GetLastError() << endl;
  return -1;
    }
  cout << TEST_FUNCTION_NAME << " " << function << endl;
  char name[256] = {0};
    function(name);
    cout<<"RESULT="<< name << endl;
    FreeLibrary(hDLL);//卸载dllTest.dll文件；
  cout << "End" << endl;
    return 0;
}

D:\Office-5.0-project\c\Debug>TaishanDllTest.exe
Start
D:\Office-5.0-project\c\windows-printer\Debug\TPrinter.dll 63B00000
GetDefaultPrinterName 63B012DF
RESULT=Microsoft XPS Document Writer
End