Access Violation.

[UnknownBlue]

Hi.

I have this error after I run VC6 program; "First-chance exception in CV_13.exe (NTDLL.DLL): 0xC0000005: Access Violation."

I have this error after I add a member variable to a class. If I do not add this member variable, the program works fine.

What does this error means? And how can I fix it?
Thanks.

[vermarajeev]

Hi.

I have this error after I run VC6 program; "First-chance exception in CV_13.exe (NTDLL.DLL): 0xC0000005: Access Violation."

I have this error after I add a member variable to a class. If I do not add this member variable, the program works fine.

What does this error means? And how can I fix it?
Thanks.

Error 0xC0000005 (Access Violation) is a very generic error and is application specific.
Can you provide some code that you have written????

[UnknownBlue]

Hi.

I have a program which is able to run. But when I add a member variable, int m_factor, through Classview, I cant run the program anymore. And if I delete int m_factor, it works again! I dont know why I cant add member variable.

[svlsr2000]

http://www.updatexp.com/0xC0000005.html

gives a general introduction about this error. can u post the code for classView and where your adding the variable.

[arunmib]

In short or to brief it up, the new variable you are adding might be trying to access some memory location which is not in your program's scope or doing something which makes some other variable to access beyond your program's scope.

Thats all I can say with the data you have provided.

[UnknownBlue]

can u post the code for classView and where your adding the variable.

class CCVPlot : public CStatic
{
// Construction
public:
	CCVPlot();

// Attributes
public:

// Operations
public:

// Overrides
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CCVPlot)
	//}}AFX_VIRTUAL

// Implementation
public:
	int m_factor;
	int m_colour;
	int m_blackRect;
	int m_iY2;
	int m_iY1;
	int m_iX2;
	int m_iX1;
	CRect m_recto;
	int m_onDraw;
	int m_xEnd;
	int m_xBegin;
	int m_graph;
	short m_xAxis[10240];
	short m_yAxis[10240];
	virtual ~CCVPlot();

	// Generated message map functions
protected:
	//{{AFX_MSG(CCVPlot)
	afx_msg void OnPaint();
	//}}AFX_MSG

	DECLARE_MESSAGE_MAP()
private:
	void WithDelay(CDC &dc);
};

the variable is added to a class that I have created with base class CStatic.

[AdrianH]

class CCVPlot : public CStatic
{
// Construction
public:
	CCVPlot();

// Attributes
public:

// Operations
public:

// Overrides
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CCVPlot)
	//}}AFX_VIRTUAL

// Implementation
public:
	int m_factor;
	int m_colour;
	int m_blackRect;
	int m_iY2;
	int m_iY1;
	int m_iX2;
	int m_iX1;
	CRect m_recto;
	int m_onDraw;
	int m_xEnd;
	int m_xBegin;
	int m_graph;
	short m_xAxis[10240];
	short m_yAxis[10240];
	virtual ~CCVPlot();

	// Generated message map functions
protected:
	//{{AFX_MSG(CCVPlot)
	afx_msg void OnPaint();
	//}}AFX_MSG

	DECLARE_MESSAGE_MAP()
private:
	void WithDelay(CDC &dc);
};

the variable is added to a class that I have created with base class CStatic.

Try doing a clean rebuild, not an incrimental rebuild. What appears to be happening is you have some sort of phase error where parts of the code have old definitions of the class and are accessing it inappropriately because of this.


Adrian

[UnknownBlue]

Try doing a clean rebuild, not an incrimental rebuild. What appears to be happening is you have some sort of phase error where parts of the code have old definitions of the class and are accessing it inappropriately because of this.


Adrian

It works! Thanks a lot!

[AdrianH]

It works! Thanks a lot!

Glad to help.


Adrian