Library

新建 Library

新建Cpp File

File1.cpp

extern "C" __declspec(dllexport) int add(int a,int b)
{return a+b;}

Build

Project->Build Project1

使用

新建项目

Add New Project

Unit1.cpp

#pragma hdrstop#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
#pragma comment(lib, "Project1.lib")//链接lib,另一种方法是直接加到exe项目里更简单
extern "C" __declspec(dllimport) int add(int a,int b);//引入涵娄
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner): TForm(Owner)
{int c=add(10,20);//使用函数ShowMessage(IntToStr(c));
}
//---------------------------------------------------------------------------

说明：vcl编写的dll的调用也类似