C / C++ / MFC

Re: variable solution compiles, but I can't get at value: [modified]

9-Nov-07 6:20

All this extra stuff aside, the fact still remains that:

CMemMapCppClientDlg dlg;
CString strContent = dlg.GetContent();
MessageBox(NULL, strContent, _T("Like this:"), MB_OK);

will do nothing but display an empty message box. You can verify this by initializing m_strContent to something in CMemMapCppClientDlg's constructor.

After looking at what you've provided, it seems you have two instances of CMemMapCppClientDlg: the main one instantiated from CMemMapCppClientApp::InitInstance(), and another one instantiated from SumOneToArray(). Is that correct?

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

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e40s9-Nov-07 6:36

Re: variable solution compiles, but I can't get at value:

9-Nov-07 6:36

>>After looking at what you've provided, it seems you have two instances of CMemMapCppClientDlg: the main one instantiated from CMemMapCppClientApp::InitInstance(), and another one instantiated from SumOneToArray(). Is that correct?
I don't believe so, but I can't say for certain. Can you tell me? Here's the full MemMapCppClient.cpp (ole2.h doesn't show up in our display here for the second #include because it's enclosed in less than/greater than punctuations):

// MemMapCppClient.cpp : Defines the class behaviors for the application.
//

#include "stdafx.h"
#include <ole2.h>
#include "MemMapCppClient.h"
#include "MemMapCppClientDlg.h"

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

VARIANT _stdcall CheckExcelArray(VARIANT& ExcelArray)
{
VARIANT dvout;
switch(ExcelArray.vt)
{
case VT_DISPATCH:
// if Array is a Range object expose its values through the 
//IDispatch interface
{
EXCEPINFO excep;
DISPPARAMS dispparams;
unsigned int uiArgErr;
DISPID dispidValue;
LPOLESTR XName = L"Value";

ExcelArray.pdispVal->GetIDsOfNames(IID_NULL, &XName,
        1, LOCALE_SYSTEM_DEFAULT, &dispidValue);

dispparams.cArgs = 0;
dispparams.cNamedArgs = 0;

// Invoke PropertyGet and store values in dvout
ExcelArray.pdispVal->Invoke(dispidValue, IID_NULL,
LOCALE_SYSTEM_DEFAULT, DISPATCH_PROPERTYGET, 
&dispparams, &dvout, &excep, &uiArgErr);

ExcelArray.pdispVal->Release();

return dvout;
}

break;

default:
//if the Array is a VBA SAFEARRAY return it as such
return ExcelArray;
break;
}
VariantClear(&dvout);
VariantClear(&ExcelArray);
}

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

//check if Array is a Range object
if(sourceArray.vt==VT_DISPATCH)
sourceArray = CheckExcelArray(sourceArray);

long ncols, nrows, i, j;

//get the number columns and rows
ncols=(sourceArray.parray)->rgsabound[0].cElements;
nrows=(sourceArray.parray)->rgsabound[1].cElements;

//dynamically allocate memory for an array to store values
VARIANT *dArray = new VARIANT [nrows*ncols];

for(i=0; i<nrows; i++)
{
for(j=0; j<ncols; j++)
{
long indi[] = {i+1,j+1};
//store in a VARIANT array for other uses 
SafeArrayGetElement(sourceArray.parray, indi, &dArray[(i*ncols)+j]);

}
}

//create a VARIANT SAFEARRAY to return modified values
VARIANT destArray;
destArray.vt = VT_ARRAY | VT_VARIANT;

SAFEARRAYBOUND sab[2];
sab[0].lLbound = 1; sab[0].cElements = nrows;
sab[1].lLbound = 1; sab[1].cElements = ncols;
destArray.parray = SafeArrayCreate(VT_VARIANT, 2, sab);

for(i=0; i<nrows; i++)
{
for(j=0; j<ncols; j++)
{
long indi[] = {i+1,j+1};

//check for the type of VARIANT in the array
switch(dArray[(i*ncols)+j].vt)
{
case VT_I2:
dArray[(i*ncols)+j].iVal=dArray[(i*ncols)+j].iVal + 1;
// dArray[(i*ncols)+j].iVal=1000;
break;

case VT_R8:
dArray[(i*ncols)+j].dblVal=dArray[(i*ncols)+j].dblVal + 1;
// dArray[(i*ncols)+j].dblVal=3700;
break;

//Hope the interested reader can perform more interesting operations!
//So here You need to add checking for the rest of VARIANT types
//there are plenty of them and You need to know what types your
//array may hold!

default:
break;
}

//Put the result in the array to be returned to Excel or the VBA env.
SafeArrayPutElement(destArray.parray, indi, &dArray[(i*ncols)+j]);
}
}

//free memory of the intermediate storage variable
delete [] dArray;

//return the modified array to SpreadSheet or VBA environment
return destArray;

//free memory for VARIANTs
VariantClear(&sourceArray);
VariantClear(&destArray);
}

/////////////////////////////////////////////////////////////////////////////
// CMemMapCppClientApp

BEGIN_MESSAGE_MAP(CMemMapCppClientApp, CWinApp)
END_MESSAGE_MAP()

//[leave the dialog]:
//void CMemMapCppClientDlg::OnWindowPosChanging(WINDOWPOS FAR* lpwndpos) 
//{
//    lpwndpos->flags &= ~SWP_SHOWWINDOW;
//    CDialog::OnWindowPosChanging(lpwndpos);
//}

/////////////////////////////////////////////////////////////////////////////
// CMemMapCppClientApp construction

CMemMapCppClientApp::CMemMapCppClientApp()
{
	// TODO: add construction code here,
	// Place all significant initialization in InitInstance
}

/////////////////////////////////////////////////////////////////////////////
// The one and only CMemMapCppClientApp object

CMemMapCppClientApp theApp;

/////////////////////////////////////////////////////////////////////////////
// CMemMapCppClientApp initialization

BOOL CMemMapCppClientApp::InitInstance()
{
	CMemMapCppClientDlg dlg;
	m_pMainWnd = &dlg;
	int nResponse = dlg.DoModal();

//	MessageBox(NULL, _T(LPSTR (m_pMainWnd)), "Whatever", MB_OK);

	return FALSE;
}

Here's the full MemMapCppClientDlg.cpp:

// 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}");
}

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;
}

The full MemMapCppClient.h

// MemMapCppClient.h : main header file for the MEMMAPCPPCLIENT application
//

#if !defined(AFX_MEMMAPCPPCLIENT_H__6FC73066_4FE5_46F4_891C_2434753F81AA__INCLUDED_)
#define AFX_MEMMAPCPPCLIENT_H__6FC73066_4FE5_46F4_891C_2434753F81AA__INCLUDED_

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

#ifndef __AFXWIN_H__
	#error include 'stdafx.h' before including this file for PCH
#endif

#include "resource.h"		// main symbols

// CMemMapCppClientApp
// See MemMapCppClient.cpp for the implementation of this class
//

class CMemMapCppClientApp : public CWinApp
{
public:
	CMemMapCppClientApp();

// Overrides
public:
	virtual BOOL InitInstance();

	DECLARE_MESSAGE_MAP()
};

#endif // !defined(AFX_MEMMAPCPPCLIENT_H__6FC73066_4FE5_46F4_891C_2434753F81AA__INCLUDED_)

The full MemMapCppClientDlg.h:

// 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
        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()
	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_)

-- modified at 12:41 Friday 9th November, 2007

David Crow9-Nov-07 6:40

Re: variable solution compiles, but I can't get at value:

9-Nov-07 6:40

e40s wrote:
I don't believe so...

I do. Observe:

VARIANT _stdcall SumOneToArray(VARIANT sourceArray)
{
    CMemMapCppClientDlg dlg;
    CString strContent = dlg.GetContent();
    ...
}
 
BOOL CMemMapCppClientApp::InitInstance()
{	
    CMemMapCppClientDlg dlg;	
    m_pMainWnd = &dlg;
    dlg.DoModal();
    ...
}

e40s9-Nov-07 6:45

Re: variable solution compiles, but I can't get at value:

9-Nov-07 6:45

Whoa! How'd you do that? Smile | :)

I'll pull it and see what happens.

e40s9-Nov-07 6:47

Re: variable solution compiles, but I can't get at value:

9-Nov-07 6:47

So how do I get around this?

David Crow9-Nov-07 6:52

Re: variable solution compiles, but I can't get at value: [modified]

9-Nov-07 6:52

One way is to make the member variable static. This means that GetContent() will also need to be static.

Your next question (regarding scope) can be answered here.

e40s9-Nov-07 7:04

Re: variable solution compiles, but I can't get at value:

9-Nov-07 7:04

Okay, I changed it to this:

// 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_)

Fascinating. (I mean that sincerely.) Well, the first thing it did was change the argument disposition of MessageBox inside of GetContent(), so I commented that MessageBox line out there.

Attempted a recompile.

The errors:

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"

-- modified at 13:12 Friday 9th November, 2007

David Crow9-Nov-07 7:11

Re: variable solution compiles, but I can't get at value:

9-Nov-07 7:11

You have not initialized m_strContent. Static data members of classes must be initialized at file scope.

e40s9-Nov-07 7:23

Re: variable solution compiles, but I can't get at value:

9-Nov-07 7:23

The link was informative. (For the future, especially about their inability to access non-static class member data using the member-selection operators mentioned. Learning more every day.)

What I tried:

// 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_)

Darn. Same errors. (Afterward I even tried adding scope resolution to some of the statements on the .cpp. Nothing changed for the better so I took those off.)

David Crow9-Nov-07 7:28

Re: variable solution compiles, but I can't get at value:

9-Nov-07 7:28

e40s wrote:
static CString CMemMapCppClientDlg::m_strContent;

Remove CMemMapCppClientDlg from the declaration. Add the following after CMemMapCppClientDlg's constructor definition:

CString CMemMapCppClientDlg::m_strContent = "";

e40s9-Nov-07 8:15

Re: variable solution compiles, but I can't get at value:

9-Nov-07 8:15

I'm confused. There's a constructor in MemMapCppClientDlg.cpp. Do I involve the .cpp in the changes, or is just the MemMapCppClientDlg.h involved?

David Crow9-Nov-07 8:27

Re: variable solution compiles, but I can't get at value: [modified]

9-Nov-07 8:27

e40s wrote:
Do I involve the .cpp in the changes...

Yes, since you have to do the initialization at file scope.

e40s9-Nov-07 8:39

Re: variable solution compiles, but I can't get at value:

9-Nov-07 8:39

It compiles, but I'm not getting anywhere. I'm so lost about following the instructions, I'm going to have to show the code. Here's the whole MemMapCppClientDlg.cpp:

// 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;
}

Here's the MemMapCppClientDlg.h:

// 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_)

It compiles, but I followed the directions wrong. Nothing's showing up in the message box.

e40s9-Nov-07 10:06

Re: variable solution compiles, but I can't get at value:

9-Nov-07 10:06

Knowing that a static asssignment can make this work is a lot further along than where I was yesterday (which is a lot farther than where I was the days and and weeks before that.)

I'm sorry I couldn't follow the instructions. My fault. I don't know if my changes to the code are right or wrong. But thanks for the guidance.

David Crow9-Nov-07 10:15

Re: variable solution compiles, but I can't get at value:

9-Nov-07 10:15

e40s wrote:
Nothing's showing up in the message box.

It's probably because you are not modifying CMemMapCppClientDlg::m_strContent, but are modifying m_strContent that is local to OnDataReady() instead. Do you concur?

e40s9-Nov-07 13:01

Re: variable solution compiles, but I can't get at value:

9-Nov-07 13:01

I don't understand. Are you saying you observe that's what I'm currently doing, and I shouldn't?

Or are you saying that's what I'm not currently doing?

Isn't m_strContect local to OnDataReady?

Where have I written something where I shouldn't? Where should I write something?

David Crow9-Nov-07 14:51

Re: variable solution compiles, but I can't get at value:

9-Nov-07 14:51

e40s wrote:
Isn't m_strContect local to OnDataReady?

Yes, it has such a local variable that gets destroyed when OnDataReady() goes out of scope. Remove that one and you should be good to go.

e40s10-Nov-07 16:23

Re: variable solution compiles, but I can't get at value:

10-Nov-07 16:23

David, I really want to thank you for your considerable help and patience and time expended in teaching me how to do this. I'm away from my machine at the moment, but I'd like to test this out as soon as I can reestablish my work in a few days. I'm looking forward to seeing it work. Smile | :)

Thanks again.

Bram van Kampen10-Nov-07 15:02

Bram van Kampen

10-Nov-07 15:02

e40s wrote:
VARIANT _stdcall SumOneToArray(VARIANT sourceArray)
{
CMemMapCppClientDlg dlg;
CString strContent = dlg.GetContent();
MessageBox(NULL, _T(strContent), _T("Like this:"), MB_OK);

You declare a NEW instance of the CMemMapCppClientDlg! Another instance may have ran, but this one definitely has not! So, m_strContent is still empty!
As a consequence MessageBox(...) will display the empty string. Nothing Strange about that.( why not use AfxMessageBox(...)? )

If you want to share m_strContent between different instances, make it static! Be aware of other side effects though if you do this.
BTW Do not use the _T() Macro on a variable, only on quoted text.

Hope this helps you along Smile | :)

Bram van Kampen

Re: variable solution compiles, but I can't get at value:

e40s10-Nov-07 16:26

Displaying Graph Controls values in a grid.

10-Nov-07 16:26

Bram, thank you for this; the more posters who confirm this direction means I can be that much more comfortable this is the standard and state of the art.

pod_9998-Nov-07 10:11

pod_999

8-Nov-07 10:11

Hi there,
I'm using an MFC graph control to display multiple lines from a stored results file. Each line has a corresponding Y axis & colour.
Is it possible to drag a vertical line across the chart (using OnLButtonDown?) which would then dynamically display the intersecting values in a grid control, along with the corresponding Y axis name & line colour?

Cheers.
PS. This is my 1st post to Code Project so I apologise if it's a bit vague.

ADVAthanksNCE

shpid3r8-Nov-07 10:18

shpid3r

8-Nov-07 10:18

ADVAthanksNCE is so great Smile | :)

Hope someone will know how to help you
Cheers

Llasus8-Nov-07 12:56

Llasus

8-Nov-07 12:56

Can you give me details about the MFC graph control that you are using? It is possible to get that as long as you have complete access to the graph control.

pod_9999-Nov-07 0:16

pod_999

9-Nov-07 0:16

Hi, The graph control is an ocx (COleControlModule) and I do have full access to it.
At the moment, I use a CDialog to drop the basic line chart into.

To be specific, what I want to do is:
Enhance my basic line graph to:
1. Add a mouse-moveable vertical line originating from the x-axis.
2. Display the values at the points where the lines on the graph intersect the vertical line.
3. Use a grid to display each value with it's associated line colour/type & name.
4. Add/remove lines (& relevant y-axes) to the graph & grid.

Thanks.