我在OnDraw()里画出要打印的数据,不管又多少数据,一直画完为止,预览和打印时只能看到一页,我怎么样才能预览和打印多页,我查过论坛中的有关分页打印的帖子,说得不太清楚,好像要自己计算,可怎么计算呢,谁能详细说一下。
我是今年三月才开始用VC的,对VC不太了解,希望大虾们多指点。谢谢!
我是今年三月才开始用VC的,对VC不太了解,希望大虾们多指点。谢谢!
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CMyView::OnPreparePrinting
设定Document长度,调用CView::DoPreparePrinting以显示打印对话框并产生打印机DC
CMyView::OnBeginPrinting
设定以DC为准的Document长度(可以计算页数并设置),配置GDI资源
CMyView::OnPrepareDC
改变viewport原点、剪截区以及其他DC属性
CMyView::OnPrint
CMyView::OnDraw
打印页眉、页脚等等
CMyView::OnEndPrinting
释放GDI资源基于此,可以知道如:动态计算页码并决定是否继续打印应该在CMyView::OnPrepareDC中、设置页码数应该在CMyView::OnBeginPrinting中。
{
// TODO: add extra initialization before printing
}BOOL CMyView::OnPreparePrinting(CPrintInfo* pInfo)
{
pInfo->SetMaxPage(2); // the document is two pages long:
// the first page is the title page
// the second is the drawing
BOOL bRet = DoPreparePrinting(pInfo); // default preparation
pInfo->m_nNumPreviewPages = 2; // Preview 2 pages at a time
// Set this value after calling DoPreparePrinting to override
// value read from .INI file
return bRet;
}void CMyView::OnPrint(CDC* pDC, CPrintInfo* pInfo)
{
if (pInfo->m_nCurPage == 1) // page no. 1 is the title page
{
PrintTitlePage(pDC, pInfo);
return; // nothing else to print on page 1 but the page title
}
CString strHeader = _T("My Print Header"); PrintPageHeader(pDC, pInfo, strHeader);
// PrintPageHeader() subtracts out from the pInfo->m_rectDraw the
// amount of the page used for the header. pDC->SetWindowOrg(pInfo->m_rectDraw.left,-pInfo->m_rectDraw.top); // Now print the rest of the page
OnDraw(pDC);
}void CMyView::PrintPageHeader(CDC* pDC, CPrintInfo* pInfo,
CString& strHeader)
{
// Print a page header consisting of the name of
// the document and a horizontal line
pDC->SetTextAlign(TA_LEFT);
pDC->TextOut(0,-25, strHeader); // 1/4 inch down // Draw a line across the page, below the header
TEXTMETRIC textMetric;
pDC->GetTextMetrics(&textMetric);
int y = -35 - textMetric.tmHeight; // line 1/10th inch below text
pDC->MoveTo(0, y); // from left margin
pDC->LineTo(pInfo->m_rectDraw.right, y); // to right margin // Subtract out from the drawing rectange the space used by the header.
y -= 25; // space 1/4 inch below (top of) line
pInfo->m_rectDraw.top += y;
}void CMyView::PrintTitlePage(CDC* pDC, CPrintInfo* pInfo)
{
// Prepare a font size for displaying the file name
LOGFONT logFont;
memset(&logFont, 0, sizeof(LOGFONT));
logFont.lfHeight = 75; // 3/4th inch high in MM_LOENGLISH
// (1/100th inch)
CFont font;
CFont* pOldFont = NULL;
if (font.CreateFontIndirect(&logFont))
pOldFont = pDC->SelectObject(&font); // Get the file name, to be displayed on title page
CString strPageTitle = _T("My Print Header"); // Display the file name 1 inch below top of the page,
// centered horizontally
pDC->SetTextAlign(TA_CENTER);
pDC->TextOut(pInfo->m_rectDraw.right/2, -100, strPageTitle); if (pOldFont != NULL)
pDC->SelectObject(pOldFont);
}void CMyView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
// TODO: add cleanup after printing
}