VC6 DLL exports

//filename : Dll1.h #ifndef _DLL1_H_  #define  _DLL1_H_   #ifdef DLL1_API #else #define DLL1_API extern "C" _declspec(dllimport) #endif // DLL1_API  DLL1_API int _stdcall add(int a,int b); DLL1_API int _stdcall substract(int a,int b);   #endif

//filename:Dll1.cpp #define DLL1_API extern "C" _declspec(dllexport) #include "Dll1.h"  int _stdcall add(int a,int b) {  return a+b; }  int _stdcall substract(int a,int b) {  return a-b; }

//MyPoint.h   // MyPoint.h: interface for the MyPoint class. // //////////////////////////////////////////////////////////////////////   #include <windows.h> #include <stdio.h>  #if !defined(AFX_MYPOINT_H__0FB85FE1_A0BB_4FF3_B780_79E133776F44__INCLUDED_) #define AFX_MYPOINT_H__0FB85FE1_A0BB_4FF3_B780_79E133776F44__INCLUDED_  #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000  #ifdef DLL2_API #else #define DLL2_API _declspec(dllimport) #endif // DLL2_API  class DLL2_API MyPoint   { public:  void output();   MyPoint();  virtual ~MyPoint();   public:   int y;  int x; };  #endif // !defined(AFX_MYPOINT_H__0FB85FE1_A0BB_4FF3_B780_79E133776F44__INCLUDED_)

// MyPoint.cpp: implementation of the MyPoint class. // //////////////////////////////////////////////////////////////////////  #define DLL2_API _declspec(dllexport) #include "MyPoint.h"  ////////////////////////////////////////////////////////////////////// // Construction/Destruction //////////////////////////////////////////////////////////////////////  MyPoint::MyPoint() {  x=0;  y=0; }  MyPoint::~MyPoint() {   }  void MyPoint::output() {  HWND hWnd = GetForegroundWindow();  HDC hdc = GetDC(hWnd);  char buf[40];  memset(buf,0,40);  sprintf(buf,"x=%d,y=%d",x,y);  TextOut(hdc,0,0,buf,strlen(buf));  ReleaseDC(hWnd,hdc); }

Dll1.def

LIBRARY Dll1  EXPORTS  add substract

void CDllTestDlg::OnBtnLoadLibrary()  {  HMODULE hModule = LoadLibrary("Dll1.dll");  if(!hModule)  {   MessageBox("未能加载DLL");   return;  }  typedef  int  (_stdcall *ADDPROC) (int,int);  ADDPROC add=(ADDPROC) GetProcAddress(hModule,"substract");  if(!add){   MessageBox("未找到指定函数");   return;  }  int result=add(1,22);  CString str;  str.Format("%d",result);  MessageBox(str); }