C / C++ / MFC

// MemMapCppClientDlg.h : header file
//

#if !defined(AFX_MEMMAPCPPCLIENTDLG_H__A51F6AF7_F28D_461D_8FB3_EFC7B929D99C__INCLUDED_)
#define AFX_MEMMAPCPPCLIENTDLG_H__A51F6AF7_F28D_461D_8FB3_EFC7B929D99C__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

/////////////////////////////////////////////////////////////////////////////
// CMemMapCppClientDlg dialog

class CMemMapCppClientDlg : public CDialog
{
// Construction
public:
	static UINT UWM_DATA_READY;
	CMemMapCppClientDlg(CWnd* pParent = NULL);	// standard constructor
         static CString GetContent();

// Dialog Data
	enum { IDD = IDD_MEMMAPCPPCLIENT_DIALOG };
	// ClassWizard generated virtual function overrides
	protected:

// Implementation
protected:
	// Generated message map functions
	//{{AFX_MSG(CMemMapCppClientDlg)
	virtual BOOL OnInitDialog();
//[leave the dialog]	afx_msg void CMemMapCppClientDlg::OnWindowPosChanging(WINDOWPOS FAR* lpwndpos);
	afx_msg LRESULT OnDataReady(WPARAM wParam, LPARAM lParam);
	DECLARE_MESSAGE_MAP()
	static CString m_strContent; 

private:
	//enum { m_dwMemFileSize = 2 * 1024 };
	LPCTSTR m_pszMemMapFileName;
};

	#define UWM_DATA_READY_MSG _T("UWM_DATA_READY_MSG-{7FDB2CB4-5510-4d30-99A9-CD7752E0D680}")

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_MEMMAPCPPCLIENTDLG_H__A51F6AF7_F28D_461D_8FB3_EFC7B929D99C__INCLUDED_)

1>MemMapCppClientDlg.obj : error LNK2001: unresolved external symbol "protected: static class ATL::CStringT<char,class StrTraitMFC_DLL<char,class ATL::ChTraitsCRT<char> > > CMemMapCppClientDlg::m_strContent" (?m_strContent@CMemMapCppClientDlg@@1V?$CStringT@DV?$StrTraitMFC_DLL@DV?$ChTraitsCRT@D@ATL@@@@@ATL@@A)
1>c:\experimental sample\Debug\MFC_DLL_03.dll : fatal error LNK1120: 1 unresolved externals
1>Build log was saved at "file://c:\experimental sample\MFC_DLL_03\Debug\BuildLog.htm"

// MemMapCppClientDlg.h : header file
//

#if !defined(AFX_MEMMAPCPPCLIENTDLG_H__A51F6AF7_F28D_461D_8FB3_EFC7B929D99C__INCLUDED_)
#define AFX_MEMMAPCPPCLIENTDLG_H__A51F6AF7_F28D_461D_8FB3_EFC7B929D99C__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

/////////////////////////////////////////////////////////////////////////////
// CMemMapCppClientDlg dialog

class CMemMapCppClientDlg : public CDialog
{
// Construction
public:
	static UINT UWM_DATA_READY;
	CMemMapCppClientDlg(CWnd* pParent = NULL);	// standard constructor
         static CString CMemMapCppClientDlg::GetContent();

// Dialog Data
	enum { IDD = IDD_MEMMAPCPPCLIENT_DIALOG };
	// ClassWizard generated virtual function overrides
	protected:

// Implementation
protected:
	// Generated message map functions
	//{{AFX_MSG(CMemMapCppClientDlg)
	virtual BOOL OnInitDialog();
//[leave the dialog]	afx_msg void CMemMapCppClientDlg::OnWindowPosChanging(WINDOWPOS FAR* lpwndpos);
	afx_msg LRESULT OnDataReady(WPARAM wParam, LPARAM lParam);
	DECLARE_MESSAGE_MAP()
	static CString CMemMapCppClientDlg::m_strContent; 

private:
	//enum { m_dwMemFileSize = 2 * 1024 };
	LPCTSTR m_pszMemMapFileName;
};

	#define UWM_DATA_READY_MSG _T("UWM_DATA_READY_MSG-{7FDB2CB4-5510-4d30-99A9-CD7752E0D680}")

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_MEMMAPCPPCLIENTDLG_H__A51F6AF7_F28D_461D_8FB3_EFC7B929D99C__INCLUDED_)

e40s wrote:

static CString CMemMapCppClientDlg::m_strContent;

CString CMemMapCppClientDlg::m_strContent = ""; 

e40s wrote:

Do I involve the .cpp in the changes...

// MemMapCppClientDlg.cpp : implementation file
//

#include "stdafx.h"
#include "MemMapCppClient.h"
#include "MemMapCppClientDlg.h"

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

UINT CMemMapCppClientDlg::UWM_DATA_READY = RegisterWindowMessage(UWM_DATA_READY_MSG); 
/////////////////////////////////////////////////////////////////////////////
// CMemMapCppClientDlg dialog

CMemMapCppClientDlg::CMemMapCppClientDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CMemMapCppClientDlg::IDD, pParent)
{
	m_pszMemMapFileName = _T("Mem_Map_File-{70122C30-0239-4f98-9D21-36885C8A8121}");
}
CString CMemMapCppClientDlg::m_strContent = "";

BEGIN_MESSAGE_MAP(CMemMapCppClientDlg, CDialog)
//[leave the dialog]	ON_WM_WINDOWPOSCHANGING()
	ON_REGISTERED_MESSAGE(UWM_DATA_READY, OnDataReady)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMemMapCppClientDlg message handlers

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

	return TRUE;  // return TRUE  unless you set the focus to a control
}

LRESULT CMemMapCppClientDlg::OnDataReady(WPARAM, LPARAM) 
{
	HANDLE hMapFile = NULL;
	PVOID pView = NULL;

	hMapFile = OpenFileMapping(FILE_MAP_READ, FALSE, m_pszMemMapFileName);
	if(hMapFile == NULL) {
		MessageBox("Can not open file mapping");
		return 0;
	}

	pView = MapViewOfFile(hMapFile, FILE_MAP_READ, 0, 0, 0);
	if(pView == NULL) {
		MessageBox("Can map view of file");
		CloseHandle(hMapFile);
		return 0;
	}

	LPSTR szContent = reinterpret_cast<LPSTR>(pView);
	int nLen = strlen(szContent);
	CString m_strContent;
	while(nLen > 0) {
		m_strContent += *szContent++;
		--nLen;
	}
	m_strContent += '\0';
	m_strContent.Replace("\n", "\r\n");
////	m_edit.SetWindowText(m_strContent);
    MessageBox(m_strContent);

	if(pView) UnmapViewOfFile(pView);
	if(hMapFile) CloseHandle(hMapFile);

	return 0;
}

CString CMemMapCppClientDlg::GetContent()
{
//    MessageBox(m_strContent, _T("Forget this."));
	return m_strContent;
}

// MemMapCppClientDlg.h : header file
//

#if !defined(AFX_MEMMAPCPPCLIENTDLG_H__A51F6AF7_F28D_461D_8FB3_EFC7B929D99C__INCLUDED_)
#define AFX_MEMMAPCPPCLIENTDLG_H__A51F6AF7_F28D_461D_8FB3_EFC7B929D99C__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

/////////////////////////////////////////////////////////////////////////////
// CMemMapCppClientDlg dialog

class CMemMapCppClientDlg : public CDialog
{
// Construction
public:
	static UINT UWM_DATA_READY;
	CMemMapCppClientDlg(CWnd* pParent = NULL);	// standard constructor
	static CString GetContent();
//	CString GetContent();

// Dialog Data
	enum { IDD = IDD_MEMMAPCPPCLIENT_DIALOG };
	// ClassWizard generated virtual function overrides
	protected:

// Implementation
protected:
	// Generated message map functions
	//{{AFX_MSG(CMemMapCppClientDlg)
	virtual BOOL OnInitDialog();
//[leave the dialog]	afx_msg void CMemMapCppClientDlg::OnWindowPosChanging(WINDOWPOS FAR* lpwndpos);
	afx_msg LRESULT OnDataReady(WPARAM wParam, LPARAM lParam);
	DECLARE_MESSAGE_MAP()
	static CString m_strContent;
//	CString m_strContent;

private:
	//enum { m_dwMemFileSize = 2 * 1024 };
	LPCTSTR m_pszMemMapFileName;
};

	#define UWM_DATA_READY_MSG _T("UWM_DATA_READY_MSG-{7FDB2CB4-5510-4d30-99A9-CD7752E0D680}")

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_MEMMAPCPPCLIENTDLG_H__A51F6AF7_F28D_461D_8FB3_EFC7B929D99C__INCLUDED_)

e40s wrote:

Nothing's showing up in the message box.

e40s wrote:

Isn't m_strContect local to OnDataReady?

e40s wrote:

VARIANT _stdcall SumOneToArray(VARIANT sourceArray)
{
CMemMapCppClientDlg dlg;
CString strContent = dlg.GetContent();
MessageBox(NULL, _T(strContent), _T("Like this:"), MB_OK);

unsigned long ElfHash(unsigned char* c)
{
	unsigned long hash = 0;
	unsigned long x = 0;
	while (*c)
	{
		hash = (hash << 4 ) + *c++;
		if(x = hash & 0xF0000000)
		{
			hash ^= x >> 24;
		}
		hash &= ~x;
	}
    return hash;
}