Windows下动态库的编译以及调用

1.MFC下生成动态库

1>显式调用

在.cpp文件里添加接口函数

 int sum(int a,int b)
 {
     return a + b;
 }

 int sub(int a,int b)
 {
     return a - b;
 }

在.def文件里标示导出接口
  sum @; sub @;

编译即可生成动态库

在.exe里调用

在头文件里添加

 #pragma comment(lib,"TestDLL")
 int sum(int a,int b);
 int sub(int a,int b);

 public:
     void InitAll();
     CString decToStr(int dec);

 public:
     CString str1,str2;
     int a,b;

Button事件

 void CTestDlgDlg::OnButtonAdd()
 {
     // TODO: Add your control notification handler code here
     InitAll();
     int c = sum(a,b);
     CString sum1 = decToStr(c);
     SetDlgItemText(IDC_EDIT3,sum1);
 }

 void CTestDlgDlg::OnButtonSub()
 {
     // TODO: Add your control notification handler code here
     InitAll();
     int d = sub(a,b);
     CString Sub = decToStr(d);
     SetDlgItemText(IDC_EDIT4,Sub);
 }

 void CTestDlgDlg::InitAll()
 {
     UpdateData(TRUE);
     GetDlgItemText(IDC_EDIT1,str1);
     GetDlgItemText(IDC_EDIT2,str2);
     a = atoi(str1);
     b = atoi(str2);
 }

 CString CTestDlgDlg::decToStr(int dec)
 {
     CString str;
     str.Format(_T("%d"),dec);
     return str;
 }

然后将相应的.dll和.lib拷贝到相应目录即可。

2>隐式调用

在头文件里添加

typedef int (*PFUNC)(int,int);

HMODULE hDllLib; PFUNC m_pSum; PFUNC m_pSub;

在BOOL CTestDlgDlg::OnInitDialog()里添加

     hDllLib = LoadLibrary("TestDll.dll");
     if (hDllLib == NULL)
     {
         AfxMessageBox("dll load error");
         return FALSE;
     }
     m_pSum = (PFUNC)(GetProcAddress(hDllLib,"sum"));
     m_pSub = (PFUNC)(GetProcAddress(hDllLib,"sub"));

其他相应代码

 void CTestDlgDlg::OnButtonAdd()
 {
     // TODO: Add your control notification handler code here
     InitAll();
     int c= m_pSum(a,b);
     CString sum1 = decToStr(c);
     SetDlgItemText(IDC_EDIT3,sum1);
 }

 void CTestDlgDlg::OnButtonSub()
 {
     // TODO: Add your control notification handler code here
     InitAll();
     int d = m_pSub(a,b);
     CString Sub = decToStr(d);
     SetDlgItemText(IDC_EDIT4,Sub);
 }

 void CTestDlgDlg::InitAll()
 {
     UpdateData(TRUE);
     GetDlgItemText(IDC_EDIT1,str1);
     GetDlgItemText(IDC_EDIT2,str2);
     a = atoi(str1);
     b = atoi(str2);
 }

 CString CTestDlgDlg::decToStr(int dec)
 {
     CString str;
     str.Format(_T("%d"),dec);
     return str;
 }

2.Win32下动态库生成及调用

动态库头文件里添加

 extern "C" WIN32DLL_API int sum(int a,int b);
 extern "C" WIN3
2DLL_API int sub(int a,int b);

.cpp文件里添加

 extern "C" WIN32DLL_API int sum(int a,int b)
 {
     return a + b;
 }

 extern "C" WIN32DLL_API int sub(int a,int b)
 {
     return a - b;
 }

编译即生成动态库

调用

在.exe头文件里添加

 #pragma comment(lib,"Win32DLL")

 extern "C" int sum(int a,int b);
 extern "C" int sub(int a,int b);

其他相应文件

 void CTestDlgDlg::OnButtonAdd()
 {
     // TODO: Add your control notification handler code here
     InitAll();
     int c = sum(a,b);
     CString sum1 = decToStr(c);
     SetDlgItemText(IDC_EDIT3,sum1);
 }

 void CTestDlgDlg::OnButtonSub()
 {
     // TODO: Add your control notification handler code here
     InitAll();
     int d = sub(a,b);
     CString Sub = decToStr(d);
     SetDlgItemText(IDC_EDIT4,Sub);
 }

 void CTestDlgDlg::InitAll()
 {
     UpdateData(TRUE);
     GetDlgItemText(IDC_EDIT1,str1);
     GetDlgItemText(IDC_EDIT2,str2);
     a = atoi(str1);
     b = atoi(str2);
 }

 CString CTestDlgDlg::decToStr(int dec)
 {
     CString str;
     str.Format(_T("%d"),dec);
     return str;
 }

以上代码通过测试！