Compilation and invocation of dynamic libraries under Windows

Create a dynamic library under 1.MFC

1> explicitly called

Add an interface function to a. cpp file

 1  int  sum ( int  a,int   b)  2  3  return  a + b;  4   5  6  int  Sub (int  a, b)  7  { 8  return  a- b;  9 } 

Marking the export interface in a. def file
1 sum @1; 2 Sub @2;

Compile to generate a dynamic library

Called in the. exe

Add in header file

1 #pragma comment (lib, "Testdll")2int sum (int A,int  b); 3 int Sub (int A,int b);

1  Public : 2     void Initall (); 3     CString dectostr (int  dec); 4 5  Public : 6     CString str1,str2; 7     int A, b;

Button Event

 1  void   Ctestdlgdlg::onbuttonadd ()  2  3  //  Todo:add your control notification Han Dler code here  4   Initall ();  5  int  C = 6  CString sum1 = Dectostr (c);  7   Setdlgitemtext (IDC_EDIT3,SUM1);  8 } 

1 void  2{3     //  Todo:add your control notification handler code here 4     Initall (); 5     int d = Sub (A, b); 6     CString Sub = dectostr (d); 7     Setdlgitemtext (idc_edit4,sub); 8 }

1 voidCtestdlgdlg::initall ()2 {3 UpdateData (TRUE);4 GetDlgItemText (IDC_EDIT1,STR1);5 GetDlgItemText (IDC_EDIT2,STR2);6A =atoi (str1);7b =atoi (str2);8 }9 TenCString Ctestdlgdlg::d ectostr (intDec) One { A CString str; -Str. Format (_t ("%d"), DEC); -     returnstr; the}

Then copy the appropriate. dll and. Lib to the appropriate directory.

2> Implicit invocation

Add in header file

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

1 hmodule hdlllib; 2 PFUNC m_psum; 3 PFUNC m_psub;

Added in bool Ctestdlgdlg::oninitdialog ()

1Hdlllib = LoadLibrary ("TestDll.dll");2     if(Hdlllib = =NULL)3     {4AfxMessageBox ("DLL Load Error");5         returnFALSE;6     }7M_psum = (PFUNC) (GetProcAddress (Hdlllib,"sum"));8M_psub = (PFUNC) (GetProcAddress (Hdlllib,"Sub"));

Other corresponding Code

1 voidCtestdlgdlg::onbuttonadd ()2 {3     //Todo:add your control notification handler code here4 Initall ();5     intC=M_psum (A, b);6CString sum1 =Dectostr (c);7 Setdlgitemtext (IDC_EDIT3,SUM1);8 }9 Ten voidctestdlgdlg::onbuttonsub () One { A     //Todo:add your control notification handler code here - Initall (); -     intD =M_psub (A, b); theCString Sub =Dectostr (d); - Setdlgitemtext (idc_edit4,sub); - } -  + voidCtestdlgdlg::initall () - { + UpdateData (TRUE); A GetDlgItemText (IDC_EDIT1,STR1); at GetDlgItemText (IDC_EDIT2,STR2); -A =atoi (str1); -b =atoi (str2); - } -  -  inCString Ctestdlgdlg::d ectostr (intDec) - { to CString str; +Str. Format (_t ("%d"), DEC); -     returnstr; the}

Dynamic library generation and invocation under 2.win32

Add in the dynamic library header file

1 extern " C " int sum (int A,int  b); 2 extern " C " WIN3
int Sub (int A,int b);

Added in the. cpp file

1 extern "C"Win32dll_apiintSumintAintb)2 {3     returnA +b;4 }5 6 extern "C"Win32dll_apiintSubintAintb)7 {8     returnAb;9}

Compile to generate a dynamic library

Call

Add in the. exe header file

1 #pragma comment (lib, "Win32dll")23extern"C"  int sum (int A,int  b); 4 extern " C " int Sub (int A,int b);

Other corresponding files

1 voidCtestdlgdlg::onbuttonadd ()2 {3     //Todo:add your control notification handler code here4 Initall ();5     intc =sum (A, b);6CString sum1 =Dectostr (c);7 Setdlgitemtext (IDC_EDIT3,SUM1);8 }9 Ten voidctestdlgdlg::onbuttonsub () One { A     //Todo:add your control notification handler code here - Initall (); -     intD =Sub (A, b); theCString Sub =Dectostr (d); - Setdlgitemtext (idc_edit4,sub); - } -  + voidCtestdlgdlg::initall () - { + UpdateData (TRUE); A GetDlgItemText (IDC_EDIT1,STR1); at GetDlgItemText (IDC_EDIT2,STR2); -A =atoi (str1); -b =atoi (str2); - } -  -  inCString Ctestdlgdlg::d ectostr (intDec) - { to CString str; +Str. Format (_t ("%d"), DEC); -     returnstr; the}

The above code passes the test!