Share memory throuth DLL

// TestApp2Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "TestApp2.h"
#include "TestApp2Dlg.h"
#include ".\testapp2dlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CTestApp2Dlg dialog
//typedef UINT (CALLBACK* SETBUFFER)(char *); 
typedef UINT (CALLBACK* GETBUFFER)(char *);
typedef UINT (CALLBACK* SETBUFFER)(char *);



CTestApp2Dlg::CTestApp2Dlg(CWnd* pParent /*=NULL*/)
	: CDialog(CTestApp2Dlg::IDD, pParent)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CTestApp2Dlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CTestApp2Dlg, CDialog)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
	ON_BN_CLICKED(IDC_BUTTON1, OnBnClickedButton1)
	ON_BN_CLICKED(IDC_BUTTON2, OnBnClickedButton2)
END_MESSAGE_MAP()


// CTestApp2Dlg message handlers

BOOL CTestApp2Dlg::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 CTestApp2Dlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<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 function to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CTestApp2Dlg::OnQueryDragIcon()
{
	return static_cast<HCURSOR>(m_hIcon);
}

void CTestApp2Dlg::OnBnClickedButton1()
{
	
HINSTANCE hDLL;               // Handle to DLL
SETBUFFER SetBuffer;    // Function pointer

hDLL = LoadLibrary  ("..\\..\\TheDLL\\Debug\\TheDLL.dll");
if (hDLL != NULL)
{
   SetBuffer = (SETBUFFER)GetProcAddress(hDLL, "SetBuffer");

   if (!SetBuffer)
   {
      // handle the error
      FreeLibrary(hDLL);
      return;
   }
   else
   {
      // call the function
      SetBuffer("test by app2");
   }
}

}

void CTestApp2Dlg::OnBnClickedButton2()
{
HINSTANCE hDLL;               // Handle to DLL
GETBUFFER GetBuffer;    // Function pointer

hDLL = LoadLibrary("..\\..\\TheDLL\\Debug\\TheDLL.dll");
if (hDLL != NULL)
{
	char buffer[1024];
   GetBuffer = (GETBUFFER)GetProcAddress(hDLL, "GetBuffer");
   if (!GetBuffer)
   {
      // handle the error
      FreeLibrary(hDLL);
      return;
   }
   else
   {
      // call the function
	   GetBuffer((char *) buffer);
		MessageBox(buffer);
   }
}
}