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分享求助关于RichEdit的打印和打印预览功能
有一个基于对话框的RichEdit，我现在想加两个按钮，一个是对RichEdit内容的打印预览，一个是对RichEdit内容的打印，我对打印这块不是很熟，请问有什么好的类或者示例代码么？谢谢！
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yuliangpei 2005-12-01
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m_nScreenResolution通常的情况下是96
yuliangpei 2005-12-01
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m_nScreenResolution是当前屏幕的每英寸像数点数。
这是函数头部分
void PrintRichEdit(CRichEditCtrl *pRichEdit, CDC *dc, CRect rect)
其CRichEditCtrl *pRichEdit就是你的RichEdit控件，dc就是你打印机的dc，rect是你要打印RichEdit的矩形大小。
直接用，传进相应的参数就可以了。
这是函数头部分
void PrintRichEdit(CRichEditCtrl *pRichEdit, CDC *dc, CRect rect)
其CRichEditCtrl *pRichEdit就是你的RichEdit控件，dc就是你打印机的dc，rect是你要打印RichEdit的矩形大小。
直接用，传进相应的参数就可以了。
thinkingsheep 2005-12-01
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请问m_nScreenResolution是什么值？还有这个函数怎么用阿？谢谢！
yuliangpei 2005-12-01
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上面是打印的代码
yuliangpei 2005-12-01
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void PrintRichEdit(CRichEditCtrl *pRichEdit, CDC *dc, CRect rect)
{
FORMATRANGE fr;
int nLast = 0;
RECT richPage;
UINT nCurPrinterResX = dc->GetDeviceCaps(LOGPIXELSX);
float fPrnScrRatio = static_cast<float>(nCurPrinterResX * 1.0 / m_nScreenResolution);
long lLineWidth = ::MulDiv(rect.Width()*fPrnScrRatio, 1440, dc->GetDeviceCaps(LOGPIXELSX));
richPage.left = ::MulDiv(rect.left*fPrnScrRatio, 1440, dc->GetDeviceCaps(LOGPIXELSX));
richPage.top = ::MulDiv(rect.top*fPrnScrRatio , 1440, dc->GetDeviceCaps(LOGPIXELSY));
richPage.right = ::MulDiv(rect.right*fPrnScrRatio, 1440, dc->GetDeviceCaps(LOGPIXELSX));
richPage.bottom= ::MulDiv(rect.bottom*fPrnScrRatio, 1440, dc->GetDeviceCaps(LOGPIXELSY));
long lWidth = dc->GetDeviceCaps(PHYSICALWIDTH);
long lpixel = dc->GetDeviceCaps(LOGPIXELSX);
lpixel = dc->GetDeviceCaps(LOGPIXELSY);
fr.hdc = dc->m_hDC;
fr.hdcTarget = dc->m_hDC;
fr.rc = richPage;
fr.rcPage = richPage;
fr.chrg.cpMin = nLast;
fr.chrg.cpMax = -1;
dc->SaveDC();
pRichEdit->SetTargetDevice(*dc, lLineWidth);
nLast = pRichEdit->FormatRange(&fr, TRUE);
fr.chrg.cpMax = nLast;
pRichEdit->DisplayBand(&richPage);
pRichEdit->FormatRange(NULL, FALSE);
dc->RestoreDC(-1);
}
{
FORMATRANGE fr;
int nLast = 0;
RECT richPage;
UINT nCurPrinterResX = dc->GetDeviceCaps(LOGPIXELSX);
float fPrnScrRatio = static_cast<float>(nCurPrinterResX * 1.0 / m_nScreenResolution);
long lLineWidth = ::MulDiv(rect.Width()*fPrnScrRatio, 1440, dc->GetDeviceCaps(LOGPIXELSX));
richPage.left = ::MulDiv(rect.left*fPrnScrRatio, 1440, dc->GetDeviceCaps(LOGPIXELSX));
richPage.top = ::MulDiv(rect.top*fPrnScrRatio , 1440, dc->GetDeviceCaps(LOGPIXELSY));
richPage.right = ::MulDiv(rect.right*fPrnScrRatio, 1440, dc->GetDeviceCaps(LOGPIXELSX));
richPage.bottom= ::MulDiv(rect.bottom*fPrnScrRatio, 1440, dc->GetDeviceCaps(LOGPIXELSY));
long lWidth = dc->GetDeviceCaps(PHYSICALWIDTH);
long lpixel = dc->GetDeviceCaps(LOGPIXELSX);
lpixel = dc->GetDeviceCaps(LOGPIXELSY);
fr.hdc = dc->m_hDC;
fr.hdcTarget = dc->m_hDC;
fr.rc = richPage;
fr.rcPage = richPage;
fr.chrg.cpMin = nLast;
fr.chrg.cpMax = -1;
dc->SaveDC();
pRichEdit->SetTargetDevice(*dc, lLineWidth);
nLast = pRichEdit->FormatRange(&fr, TRUE);
fr.chrg.cpMax = nLast;
pRichEdit->DisplayBand(&richPage);
pRichEdit->FormatRange(NULL, FALSE);
dc->RestoreDC(-1);
}
