C / C++ / MFC

Sternocera wrote:

It would be particularly useful if I could use "stacked" barcharts, where the bar is comprised of more than one type of record, grouped together.

LOGFONT lf;
memset(&lf, 0, sizeof(LOGFONT));
lf.lfCharSet = GB2312_CHARSET;
strcpy(lf.lfFaceName, "System");
lf.lfHeight = 17;
m_font.CreateFontIndirect(&lf);
GetDlgItem(IDC_EDIT)->SetFont(&m_font);

SimplCodr wrote:

I have solved this in non-wizard generated applications by creating a virtual window in CMAinWin::CMainWin just after Create() is called using CDC and CBitmap.

CMainWin::CMainWin()
{
	RECT r;
	r.top = 200;
	r.left = 300;
	r.bottom = 500;
	r.right = 700;

	Create(NULL, "COM View", WS_OVERLAPPEDWINDOW, r,
			NULL, "TextMenu");

	// Load accelerator table
	if(!LoadAccelTable("TextMenu"))
		MessageBox("Cannot load accelerator table.", "Error");



	
	// Setup virtual screen for storing the view
	m_X = m_Y = 0;

	maxX = GetSystemMetrics(SM_CXSCREEN);
	maxY = GetSystemMetrics(SM_CYSCREEN);

	CClientDC dc(this);

	m_memDC.CreateCompatibleDC(&dc);
	m_bmp.CreateCompatibleBitmap(&dc, maxX, maxY - 10);
	m_memDC.SelectObject(&m_bmp);

	m_bkbrush.CreateStockObject(WHITE_BRUSH);
	m_memDC.SelectObject(&m_bkbrush);

	m_memDC.PatBlt(0, 0, maxX, maxY, PATCOPY);

	m_AnsiVarFont.CreateStockObject(ANSI_VAR_FONT);
	m_SystemFont.CreateStockObject(SYSTEM_FONT);
}

afx_msg void CMainWin::OnPaint()
{
	CPaintDC dc(this);

	dc.BitBlt(0, 0, maxX, maxY, &m_memDC, 0, 0, SRCCOPY);
}

void CMainWin::OnLButtonDblClk(UINT nFlags, CPoint point)
{
	// TODO: Add your message handler code here and/or call default
	strcpy_s(str, "Hello World");
	m_memDC.TextOutA(point.x, point.y, str, strlen(str));
	InvalidateRect(NULL);
	OnPaint();
	CFrameWnd::OnLButtonDblClk(nFlags, point);
}

Header File Stuff

class CMainWin : public CFrameWnd
{
public:

	int m_X, m_Y;
	char m_str[255];
	DCB dcb;
	CDC m_memDC;
	CBitmap m_bmp;
	CBrush m_bkbrush;
	CFont m_SystemFont, m_AnsiVarFont;
	
	HANDLE Ser1;

	CMainWin();
	
	afx_msg void OnPaint();
	
	afx_msg void OnExit();

	DECLARE_MESSAGE_MAP()
	
public:
	afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
public:
	afx_msg void OnLButtonDblClk(UINT nFlags, CPoint point);
private:
	CToolBar m_wndToolBar;
	CStatusBar m_wndStatusBar;
};

SimplCodr wrote:

How can I create a pointer to the device context of the current view in VS2005 created MFC single document application?

CWnd* obj = new CWnd();
obj.Create(..);
obj.paint(..);

Source File Stuff

void Ccom_testView::OnLButtonDblClk(UINT nFlags, CPoint point)
{

	// Get the extents of the screen
	maxX = GetSystemMetrics(SM_CXSCREEN);
	maxY = GetSystemMetrics(SM_CYSCREEN);

	CClientDC dc(this);
	memDC.CreateCompatibleDC(&dc);

	if (m_bmp.m_hObject == NULL)
		m_bmp.CreateCompatibleBitmap(&dc, maxX, maxY);

	memDC.SelectObject(&m_bmp);


	// This does not do what it should. Expect a white background.
	// Program Still starts with a black background
	bkBrush.CreateStockObject(WHITE_BRUSH);
	memDC.SelectObject(&bkBrush);

	CBitmap* pOldBitmap = memDC.SelectObject(&m_bmp);
	CBrush* pOldbkBrush = memDC.SelectObject(&bkBrush);
	
	// Had to set text color manually
	memDC.SetTextColor(RGB(0, 200, 100));
	memDC.SetBkColor(RGB(0,0,0));	

	wsprintf(str, "Hello World");
	memDC.TextOutA(point.x, point.y, str, strlen(str));

	memDC.SelectObject(pOldbkBrush);

	memDC.SelectObject(pOldBitmap);
	memDC.DeleteDC();

	ShowIt();

	CView::OnLButtonDblClk(nFlags, point);
}

void Ccom_testView::OnPaint()
{
	CPaintDC dc(this); // device context for painting
	// TODO: Add your message handler code here
	ShowIt();
	
	//	dc.BitBlt(0, 0, maxX, maxY, &memDC, 0, 0, SRCCOPY);
	// Do not call CView::OnPaint() for painting messages
}

bool Ccom_testView::ShowIt(void)
{
//	CDC memDC;
	CClientDC dc(this);
	CBitmap* pbmOld = NULL;

	memDC.CreateCompatibleDC(&dc);
	pbmOld = memDC.SelectObject(&m_bmp);
	
	dc.BitBlt(0, 0, maxX, maxY, &memDC, 0, 0, SRCCOPY);

	memDC.SelectObject(pbmOld);
	memDC.DeleteDC();
	
	return false;
}


Header File Stuff

class Ccom_testView : public CView
{
public:
	CDC memDC;
	CBrush bkBrush;
	CBitmap m_bmp;
	CFont m_SystemFont, m_AnsiVarFont;

protected: // create from serialization only
	Ccom_testView();
	DECLARE_DYNCREATE(Ccom_testView)

// Attributes
public:
	Ccom_testDoc* GetDocument() const;

// Operations
public:

// Overrides
public:
	virtual void OnDraw(CDC* pDC);  // overridden to draw this view
	virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
protected:
	virtual BOOL OnPreparePrinting(CPrintInfo* pInfo);
	virtual void OnBeginPrinting(CDC* pDC, CPrintInfo* pInfo);
	virtual void OnEndPrinting(CDC* pDC, CPrintInfo* pInfo);

// Implementation
public:
	virtual ~Ccom_testView();
#ifdef _DEBUG
	virtual void AssertValid() const;
	virtual void Dump(CDumpContext& dc) const;
#endif

protected:

// Generated message map functions
protected:
	DECLARE_MESSAGE_MAP()
public:
	afx_msg void OnLButtonDblClk(UINT nFlags, CPoint point);
public:
	afx_msg void OnPaint();
public:
	bool ShowIt(void);
};

bool Ccom_testView::ShowIt(void)
{
//	CDC memDC;

	CClientDC dc(this);
	CBitmap* pbmOld = NULL;

	memDC.CreateCompatibleDC(&dc);
CBitmap memBmp;
memBmp.CreateCompatibleBitmap(&dc);

	pbmOld = memDC.SelectObject(&membmp);
	
	dc.BitBlt(0, 0, maxX, maxY, &memDC, 0, 0, SRCCOPY);

	memDC.SelectObject(pbmOld);
memBmp.DeleteObject();
	memDC.DeleteDC();
	
	return false;
}