C / C++ / MFC

#pragma once

class CDoc;
class CMyScrollView : public CScrollView
{
	DECLARE_DYNCREATE(CMyScrollView)
	DECLARE_MESSAGE_MAP()

public:
	CMyScrollView();
	virtual ~CMyScrollView();

	CDoc* GetDocument();

protected:
	virtual void OnDraw(CDC* pDC);
	virtual void OnInitialUpdate();

private:
	int Height;
	int Width;
	CBitmap* Bitmap;
	CDC* MemDC;
};

#include "stdafx.h"
#include "MyScrollView.h"

IMPLEMENT_DYNCREATE(CMyScrollView, CScrollView)
BEGIN_MESSAGE_MAP(CMyScrollView, CScrollView)
END_MESSAGE_MAP()

CMyScrollView::CMyScrollView() : 
	Bitmap(new CBitmap), Width(1000), Height(200), MemDC(new CDC)
{
	MemDC->CreateCompatibleDC(NULL);
}

CMyScrollView::~CMyScrollView()
{
	delete Bitmap;
	delete MemDC;
}

CDoc* CMyScrollView::GetDocument()
{ return (CDoc*)m_pDocument; }

void CMyScrollView::OnInitialUpdate()
{
	CScrollView::OnInitialUpdate();
	
	GetParentFrame()->SetWindowText("CMyScrollView");

	CClientDC dc(this);
	Bitmap->CreateCompatibleBitmap(&dc, Width, Height);
	Bitmap->SetBitmapDimension(Width, Height);

	CBitmap* OldBitmap = MemDC->SelectObject(Bitmap);

	MemDC->PatBlt(0, 0, Width, Height, BLACKNESS);
	CPen WhitePen(PS_SOLID, 1, RGB(255,255,255));
	CPen* 	OldPen = MemDC->SelectObject(&WhitePen);
	MemDC->MoveTo(0, 0);				// ie top left
	MemDC->LineTo(Width, Height);		// ie bottom right
	MemDC->MoveTo(Width, 0);			// ie top right
	MemDC->LineTo(0, Height);			// ie bottom left
	MemDC->SelectObject(OldPen);

	CPen RedPen(PS_SOLID, 1, RGB(255,0,0));
	OldPen = MemDC->SelectObject(&RedPen);
	MemDC->Rectangle(0,0,10,10);		// red rect in top left
	MemDC->SelectObject(OldPen);

	CPen GreenPen(PS_SOLID, 1, RGB(0,255,0));
	OldPen = MemDC->SelectObject(&GreenPen);
	MemDC->Ellipse(Width-20, Height-20, Width, Height);	// green circle bottom right
	MemDC->SelectObject(OldPen);

	CRect Rect(0,Height-20,20,Height);
	CBrush Brush(RGB(0,0,255));
	MemDC->FillRect(Rect, &Brush);		// blue rect in bottom left

	MemDC->SelectObject(OldBitmap);

	SetScrollSizes(MM_TEXT, CSize(Width, Height));
	ResizeParentToFit(TRUE);
}

void CMyScrollView::OnDraw(CDC* pDC)		// works!
{
	if (Bitmap)
	{
		pDC->SetStretchBltMode( COLORONCOLOR );

		CBitmap* OldBitmap = MemDC->SelectObject(Bitmap);

		pDC->BitBlt( // l, t, w, h
			0, 0, Width, Height,
			MemDC, 
			0, 0,
			SRCCOPY);

		MemDC->SelectObject(OldBitmap);
	}
}

int x(3);
std::cout.setfill('0');
std::cout.setw(2);
std::cout << x << endl;//endl causes any following text to goto the a new line.

for (n=11; n>=0; n--)

for (n=wcslen(S)-1; n>=0; n--)

Joe Woodbury wrote:

'W' doesn't need to be L'W' since it will auto-promote to wchar_t.

2 bugs found.
> recompile ...
65534 bugs found.

class Whatever
{
public:
LPWSTR *Info;
};

if (Test->Info[n] == L'/')
{
  //do some processing
}

Fareed Rizkalla wrote:

class Whatever
{
public:
LPWSTR *Info;
};

class Whatever
{
public:
  LPWSTR pInfo;
};

LPWSTR* Info; // a pointer of pointers to character sequences
Info[n];      // a pointer to character sequence, not a character
Info[n][m];   // a character :)

caiguosen wrote:

...but I don`t know how to control different threads to read different data?

SELECT * FROM table WHERE   1 <= rownum AND rownum <= 100 // thread 1
SELECT * FROM table WHERE 101 <= rownum AND rownum <= 200 // thread 2
SELECT * FROM table WHERE 201 <= rownum AND rownum <= 300 // thread 3