Question

在窗口大小变化时，让位图区域外重绘。 不属于怪问题。 谢谢！

代码：http://www.yanglihao.com/filesUploaded/displayViaGDIView.cpp
工程压缩包：http://www.yanglihao.com/filesUploaded/displayViaGDI.rar

void CdisplayViaGDIView::OnDrawBegin()
{
// TODO: Add your command handler code here

if ( MemDC == NULL )
{
createDC(m_pDC);

}

CBrush brush(RGB(0,255,0));
MemDC.SelectObject(&brush);

MemDC.Rectangle(0,0,100,100);

Invalidate();

}

void CdisplayViaGDIView::drawTest(char* Text, int i, DWORD colorref)
{
if ( MemDC == NULL )
{
createDC(m_pDC);
}

int len = strlen(Text);

CFont font;

//CClientDC dc(this);
//MemDC.CreateCompatibleDC(&dc);
CBrush brushA(RGB(0,200,58));
CBrush brushB(RGB(200,0,233));
MemDC.SelectObject(brushA);
font.CreateFont(WIDTH, WIDTH, 0, 0, 150, 0, 0, 0, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH, NULL);

MemDC.SelectObject(&font);
MemDC.SetTextColor(colorref);
MemDC.TextOutW(0, yIncreat, CString(Text), strlen(Text));
MemDC.SetTextColor(RGB(200,0,233));
MemDC.TextOutW(i*WIDTH, yIncreat, CString(Text[i]), 1);
yIncreat += WIDTH;
Invalidate();

}

void CdisplayViaGDIView::drawKMP(char *Text, char *Pattern, int i, int j, DWORD colorref)
{
drawTest(Text, i, colorref);
drawTest(Pattern, j, colorref);
}

void CdisplayViaGDIView::OnDrawKmp()
{
// TODO: Add your command handler code here
KMP KMPInstence;
KMPInstence.m_displayViaGDIView = this;

KMPInstence.search("aaaaaaaaaaaabaaaaaaaaaaaaaaaaaaabaaaaaaabcaab", "aaaaaaabc");

}

void CdisplayViaGDIView::createDC(CDC* pdc)
{
bitmap.CreateCompatibleBitmap(pdc, 1000, 3000);
MemDC.CreateCompatibleDC(pdc);
pOldBmp = MemDC.SelectObject(&bitmap);
MemDC.FillSolidRect(0,0,1000,3000,RGB(255,255,255));

pdc->BitBlt(0,0,1000,3000, &MemDC,0,0,SRCCOPY);

}

void CdisplayViaGDIView::OnSize(UINT nType, int cx, int cy)
{
CScrollView::OnSize(nType, cx, cy);

// TODO: Add your message handler code here
OnDraw(GetDC());
}
我QQ:459281182
我按你的改了，还是不行。

Answer 1

处理WM_SIZE 事件,然后用InvalidateRect函数
函数原型:
BOOL InvalidateRect(
HWND hWnd, // handle of window with changed update region
CONST RECT *lpRect,
// address of rectangle coordinates
BOOL bErase // erase-background flag
);

具体用法,可以查MSDN.

Answer 2

将布画大小重新设置为窗口大小。