dlltestdlg.cpp

C++编程实践与技巧一书各章节的源码

// dlltestDlg.cpp : implementation file
//

#include "stdafx.h"
#include "dlltest.h"
#include "dlltestDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CDlltestDlg dialog

CDlltestDlg::CDlltestDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CDlltestDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CDlltestDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CDlltestDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CDlltestDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CDlltestDlg, CDialog)
	//{{AFX_MSG_MAP(CDlltestDlg)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDlltestDlg message handlers

BOOL CDlltestDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CDlltestDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CDlltestDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CDlltestDlg::OnButton1() 
{
typedef int (DemoAddFunc)(int,int);
HINSTANCE hDLL;               // Handle to DLL
DemoAddFunc *lpfnDllFunc1;    // Function pointer
int sum;

hDLL = LoadLibrary("d:\\dlldemo");
if (hDLL != NULL)
{
   lpfnDllFunc1 = (DemoAddFunc *)GetProcAddress(hDLL,
                                           "IntAdd");
   if (!lpfnDllFunc1)
   {
      // handle the error
      FreeLibrary(hDLL);       
      AfxMessageBox("DLL调用错误");
   }
   else
   {
      // call the function
      sum=lpfnDllFunc1(4,5);
	  CString sMsg;
	  sMsg.Format("4+5=%d",sum);
	  AfxMessageBox(sMsg);

   }
}

}