Re: Crc 32 bit - C / C++ / MFC Discussion Boards

Re: Change from Cstring to double in listview vc++

Jochen Arndt20-Mar-17 3:39

20-Mar-17 3:39

Use the debugger to find out when the exception occurs and check the code lines that has been executed before.

You can write strings directly to text files when using appropriate file functions. But those will be then Unicode text files (when having a Unicode build) and the file class does no perform implicit conversion to ANSI text.

Re: Change from Cstring to double in listview vc++

lolici20-Mar-17 8:02

lolici

20-Mar-17 8:02

Vielen Dank! Smile | :)

Re: Change from Cstring to double in listview vc++

Victor Nijegorodov20-Mar-17 6:56

Victor Nijegorodov

20-Mar-17 6:56

Is there some very important reason for you to use in a MFC application plain Win32 macros/messages to handle List Control?
What is wrong to use CListCtrl Class methods?

Re: Change from Cstring to double in listview vc++

lolici20-Mar-17 7:58

lolici

20-Mar-17 7:58

Yes!As I mentioned above I am looking for a way to save all editable data in list view in a text file.

Re: Change from Cstring to double in listview vc++

David Crow20-Mar-17 9:52

David Crow

20-Mar-17 9:52

lolici wrote:
...I am looking for a way to save all editable data in list view in a text file.

What does that have to do with not using MFC?

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Crc 32 bit

yagokhan19-Mar-17 21:58

yagokhan

19-Mar-17 21:58

Hi I am trying to commucate with a sensor usimg 32 bit crc. I am using pre-built 32bit crc table. How can I implement error detection code? Sensor sends 38bytes of data with a header 0x93.

Re: Crc 32 bit

Jochen Arndt19-Mar-17 22:15

Jochen Arndt

19-Mar-17 22:15

There is an error if the CRC send with the message is not the same as those calculated for the received message. So you have to

Receive message
Calculate CRC for received message
Compare with CRC which is part of the message

The final implementation depends on the used message format which should be part of the sensor documentation.

Re: Crc 32 bit

yagokhan19-Mar-17 22:20

yagokhan

19-Mar-17 22:20

thank you for your answer here is the code part of my project.

		for aye=bytePullIdx:(crcIdx-1) 
a = bitand(bitxor(byteBufferPtr(aye),bitshift(crc,-24)),hex2dec('FF'));
crc = bitxor(bitshift(crc,8),crcLookupTable2(a));

abowe byteBufferPtr is coming message (38bytes) crcLookupTable is pre-built table for crc polynom '04C11DB7'. after calculating crc I check if (crc==byteBufferPtr(crcIdx) condition to get the data.
Is there anything wrong here? because I could not get the right if condition here. I could not find the right crc value among the crc table values.
Thank you.

Re: Crc 32 bit

Richard MacCutchan19-Mar-17 22:57

Richard MacCutchan

19-Mar-17 22:57

You need to find out what the sensor uses to calculate its CRC.

Re: Crc 32 bit

yagokhan19-Mar-17 22:59

yagokhan

19-Mar-17 22:59

Actually I am working on code offline. I took 38byte of data starting with header and put it my code. The sensor is sensonor stim300

Re: Crc 32 bit

Richard MacCutchan19-Mar-17 23:19

Richard MacCutchan

19-Mar-17 23:19

I do not think anyone here can guess what data the device will produce. You should check the technical documentation for the device, or contact the manufacturer.

Re: Crc 32 bit

yagokhan19-Mar-17 23:22

yagokhan

19-Mar-17 23:22

The device produces 32bit crc with polynomial

0x04c11db7

What else do i need to ask?

Re: Crc 32 bit

Jochen Arndt20-Mar-17 2:36

Jochen Arndt

20-Mar-17 2:36

yagokhan wrote:
he sensor is sensonor stim300

A quick Google search for "stim300 crc" found this:
drivers-imu_stim300/src at master · rock-drivers/drivers-imu_stim300 · GitHub[^].

There see the verifyChecksum function at drivers-imu_stim300/Stim300RevD.cpp at master · rock-drivers/drivers-imu_stim300 · GitHub[^].

It uses the Boost CRC Library - 1.63.0[^] which is just a header file implementing the CRC calculations.

Catch double click on MDI client CMDIFrameWndEx

_Flaviu16-Mar-17 22:19

_Flaviu

16-Mar-17 22:19

Hi all of you. Is there a way to catch double-click event on an MDI client area, but when CMainFrame are derived from CMDIFrameWndEx, not from CMDIFrameWnd ?

I have solved this problem in the past (Catch double-click in CMainFrame[^]), when CMainFrame was derived from CMDIFrameWnd, but that trick doesn't work now ...

Can you give me a little help to solve this issue ? Thank you.

Re: Catch double click on MDI client CMDIFrameWndEx

Richard MacCutchan16-Mar-17 23:46

Richard MacCutchan

16-Mar-17 23:46

The CMDIFrameWndEx class extends CMDIFrameWnd, so it should work exactly the same.

Re: Catch double click on MDI client CMDIFrameWndEx

_Flaviu17-Mar-17 0:02

_Flaviu

17-Mar-17 0:02

I have applied the same technique:

C++

if(! m_wndMDIClient.SubclassWindow(m_hWndMDIClient))
{
    TRACE0(_T("Failed to create the MDI client window\n"));
    return -1;
}

but get me ASSERT error: wincode.cpp, line 330, but at "Retry" the IDE led me here:

C++

extern "C" int WINAPI
_tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
	_In_ LPTSTR lpCmdLine, int nCmdShow)
#pragma warning(suppress: 4985)
{
	// call shared/exported WinMain
	return AfxWinMain(hInstance, hPrevInstance, lpCmdLine, nCmdShow);
}

I don't think it is so simple now, with new CMDIFrameWndEx ... I nthe meantime, I have found this: Debug Assertion Failed While Subclassing MDIClient Window VC++ 2008[^]

Re: Catch double click on MDI client CMDIFrameWndEx

Richard MacCutchan17-Mar-17 0:26

Richard MacCutchan

17-Mar-17 0:26

I don't see that that has anything to do with your original question. And since you are subclassing the Window, it may well be that you are doing something wrong.

If you go and look at the MSDN documentation you will see that the CMDIFrameWndEx does not block any of the methods of CMDIFrameWnd.

Re: Catch double click on MDI client CMDIFrameWndEx

_Flaviu17-Mar-17 0:40

_Flaviu

17-Mar-17 0:40

Applying old code, simply not working in this new case ... hmm ... I have to dig in ...

Re: Catch double click on MDI client CMDIFrameWndEx

Victor Nijegorodov18-Mar-17 4:09

Victor Nijegorodov

18-Mar-17 4:09

Please, see my reply to the same question in CG forum: Handle WM_LBUTTONDBLCLK on CMainFrame

How to use a variable declared in another class in Visual C++

lolici16-Mar-17 3:17

lolici

16-Mar-17 3:17

Hello everyone,
I have created a list view(Declared in CDataDialog) with data . I want the list view to have as rows-cells as the conductors so I used :for (int i = 1; i<= m_DialogCon; i++) (m_DialogCon is the variable which representes the number of conductors but was declared in CFeaturesDialog). How could I use m_DialogCon variable in CDataDialog?
Here is the code:

void CDataDialog::InsertItems()
{
	HWND hWnd = ::GetDlgItem(m_hWnd, IDC_LIST1);

	// Set the LVCOLUMN structure with the required 
	// column information
	LVCOLUMN list;
	list.mask = LVCF_TEXT | LVCF_WIDTH |
		LVCF_FMT | LVCF_SUBITEM;
	list.fmt = LVCFMT_LEFT;
	list.cx = 50;
	list.pszText = L"Conductor";
	list.iSubItem = 0;
	//Inserts the column
	::SendMessage(hWnd, LVM_INSERTCOLUMN,
		(WPARAM)0, (WPARAM)&list);

	list.cx = 100;
	list.pszText = L"Resistivity";
	list.iSubItem = 1;
	::SendMessage(hWnd, LVM_INSERTCOLUMN,
		(WPARAM)1, (WPARAM)&list);

	list.cx = 100;
	list.pszText = L"Permeability";
	list.iSubItem = 2;
	::SendMessage(hWnd, LVM_INSERTCOLUMN,
		(WPARAM)2, (WPARAM)&list);

	list.cx = 100;
	list.pszText = L"Outer Diameter";
	list.iSubItem = 3;
	::SendMessage(hWnd, LVM_INSERTCOLUMN,
		(WPARAM)3, (WPARAM)&list);

	list.cx = 100;
	list.pszText = L"Inner Diameter";
	list.iSubItem = 4;
	::SendMessage(hWnd, LVM_INSERTCOLUMN,
		(WPARAM)4, (WPARAM)&list);

	list.cx = 100;
	list.pszText = L"Rdc";
	list.iSubItem = 5;
	::SendMessage(hWnd, LVM_INSERTCOLUMN,
		(WPARAM)5, (WPARAM)&list);

	list.cx = 100;
	list.pszText = L"x component";
	list.iSubItem = 6;
	::SendMessage(hWnd, LVM_INSERTCOLUMN,
		(WPARAM)6, (WPARAM)&list);

	list.cx = 100;
	list.pszText = L"y component";
	list.iSubItem = 7;
	::SendMessage(hWnd, LVM_INSERTCOLUMN,
		(WPARAM)7, (WPARAM)&list);
	
	// Inserts first Row with four columns .
	for (int i = 1; i<= m_DialogCon; i++)//here is the variable m_DialogCon                               
	                                     //from CFeaturesDialog
        {
		SetCell(hWnd, L"1", 0, 0);
		SetCell(hWnd, L"0.0000386063", 0, 1);
		SetCell(hWnd, L"1", 0, 2);
		SetCell(hWnd, L"0.025146", 0, 3);
		SetCell(hWnd, L"0.00971", 0, 4);
		SetCell(hWnd, L"0.09136", 0, 5);
		SetCell(hWnd, L"0", 0, 6);
		SetCell(hWnd, L"15.24", 0, 7);
	}
}

void CDataDialog::SetCell(HWND hWnd1,
	CString value, int nRow, int nCol)
{
	TCHAR     szString[256];
	wsprintf(szString, value, 0);

	//Fill the LVITEM structure with the 
	//values given as parameters.
	LVITEM lvItem;
	lvItem.mask = LVIF_TEXT;
	lvItem.iItem = nRow;
	lvItem.pszText = szString;
	lvItem.iSubItem = nCol;
	if (nCol >0)
		//set the value of listItem
		::SendMessage(hWnd1, LVM_SETITEM,
		(WPARAM)0, (WPARAM)&lvItem);
	else
		//Insert the value into List
		ListView_InsertItem(hWnd1, &lvItem);

}

class CDataDialog : public CDialog
{
	DECLARE_DYNAMIC(CDataDialog)
	
public:
	CDataDialog(CWnd* pParent = NULL);   // standard constructor
	virtual ~CDataDialog();

// Dialog Data
#ifdef AFX_DESIGN_TIME
	enum { IDD = IDD_DIALOG2 };
#endif

protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support

	DECLARE_MESSAGE_MAP()
public:
	afx_msg void OnBnClickedOk();
	afx_msg void OnBnClickedExit();
	void InsertItems();
	void SetCell(HWND hWnd1, CString value, int nRow, int nCol);
	CString GetItemText(HWND hWnd, int nItem, int nSubItem) const;
	afx_msg void OnClickList1(NMHDR *pNMHDR, LRESULT *pResult);
	afx_msg void OnOK();
	BOOL OnInitDialog();
	int nItem;
	int nSubItem;
};

Re: How to use a variable declared in another class in Visual C++

Jochen Arndt16-Mar-17 3:32

Jochen Arndt

16-Mar-17 3:32

Just pass it as argument to InsertItems(). If you need it also with other functions save it in a member variable.

But it is actually not used in a meaningful context in your code. You are just overwriting the cell content multiple times with the same values.

Re: How to use a variable declared in another class in Visual C++

lolici16-Mar-17 4:04

lolici

16-Mar-17 4:04

Yes this is actually what I want to do! Smile | :)

But how can I pass it as an argument?? Sorry for asking again, I'm new in programming.

Re: How to use a variable declared in another class in Visual C++

Jochen Arndt16-Mar-17 4:18

Jochen Arndt

16-Mar-17 4:18

When InsertItems() is called from the parent dialog:

class CDataDialog : public CDialog
{
    // ...
    void InsertItems(int nCon);
    // ...
    // Optional:
    // int m_nCon;
};

void CDataDialog::InsertItems(int nCon)
{
    // Optional:
    // m_nCon = nCon;
    // ...
    for (int i = 0; i < nCon)
    // ...
}

If it is not called from the parent dialog pass it using a setter function:

class CDataDialog : public CDialog
{
    // ...
    void SetCon(int nCon) { m_nCon = nCon; }
    int m_nCon;
    // ...
};

Re: How to use a variable declared in another class in Visual C++

lolici16-Mar-17 5:35

lolici

16-Mar-17 5:35

But by this way how Can I give the value of the variable when the executable runs?Variable m_DialogCon was declared in CFeaturesDialog and when I give the value in the first dialog of executable I want to create the list in the second dialog (CDataDialog).

Re: How to use a variable declared in another class in Visual C++

Jochen Arndt16-Mar-17 5:44

Jochen Arndt

16-Mar-17 5:44

It depends on when and how you are creating the dialog and calling its member functions:

C++

void CFeaturesDialog::SomeFunc()
{
    CDataDialog *pDlg = new CDataDialog(this);
    // When InsertItems() is called here
    pDlg->InsertItems(m_DialogCon);
    // Or pass value
    pDlg->SetCon(m_DialogCon);
    pDlg->DoModal();
    delete pDlg;
}

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