CRichEdit打印问题

[gmsgms]

long CharRange = 0;
long LastChar = 0;//will store document length
FORMATRANGE fr;  //format range structure
::ZeroMemory(&fr, sizeof(FORMATRANGE));
fr.hdc = hdcPrinter;
fr.hdcTarget = hdcPrinter;          //Set member in FormatRange struct
//This bit here will get all the dimentions of the printer setup
int nHorizRes = dcPrinter.GetDeviceCaps(HORZRES),                 //width P in MM
nVertRes = dcPrinter.GetDeviceCaps(VERTRES),        //hight in raster lines
nLogPixelsX = dcPrinter.GetDeviceCaps(LOGPIXELSX),  //pixels per inch along x
nLogPixelsY = dcPrinter.GetDeviceCaps(LOGPIXELSY);  //pixels per inch along y
//set the printable area of printer in the FormatRange struct
fr.rcPage.left = 0; //these 2 mean top left
fr.rcPage.top = 0;
fr.rcPage.right = (nHorizRes/nLogPixelsX) * 1440;//these 2 mean bottom right
fr.rcPage.bottom = (nVertRes/nLogPixelsY) * 1440;    //equation changes pixel to TWIPS
// Set up some margins all around. Make them one inch
//results vary on printers depending on setup
fr.rc.left   = fr.rcPage.left + 1440;  // 1440 TWIPS = 1 inch.
fr.rc.top    = fr.rcPage.top + 1440;
fr.rc.right  = fr.rcPage.right - 1440;
fr.rc.bottom = fr.rcPage.bottom - 1440;
//select all text for printing
CHARRANGE cr;
cr.cpMin =0;
cr.cpMax = -1;//-1 selects all
fr.chrg = cr;//set this in FormatRange struct
//get length of document, used for more than one page
CharRange = m_RichEdit.GetTextLength();
long lNum = (long)ceil((float)CharRange/(float)m_RichEdit.FormatRange( &fr, TRUE ));	//total pages
for(long l = 0; l < lNum; l++)
{
	dcPrinter.StartPage();	///start the page

	LastChar = m_RichEdit.FormatRange( &fr, TRUE );//send text to DC, and record index of last fitting char
	cr.cpMin = LastChar;//Change charrange struct for next page
	cr.cpMax = CharRange; //using last char printed
	fr.chrg = cr;       //set that in formatrange struct

	dcPrinter.EndPage();
}
dcPrinter.EndDoc();

以上是部分代码，打印CRichEdit控件中的内容，用(long)ceil((float)CharRange/(float)m_RichEdit.FormatRange( &fr, TRUE ))计算总页数，有时打印多出一个空白页，有时没有空白页。
请问高手：
如何精确地计算出总页数；
或者用do-while循环如何设定循环结束的条件。

[fandh]

long lNum = (long)((float)CharRange/(float)m_RichEdit.FormatRange( &fr, TRUE )+0.5f);
这样试试！

[fandh]

汗，看错了！

[fandh]

多出的空白页，可能是你里面多出的回车吧！计算前，建议去掉最后的回车！

[gmsgms]

[Quote=引用 3 楼 fandh 的回复:]
多出的空白页，可能是你里面多出的回车吧！计算前，建议去掉最后的回车！
[/Quote]最后一行没有回车。

[gmsgms]

[Quote=引用 6 楼 fengrx 的回复:]
换个思路吧，打印前判断下有没有要打印的数据。
[/Quote]怎样判断啊？

[gmsgms]

up

[fengrx]

换个思路吧，打印前判断下有没有要打印的数据。

[gmsgms]

打印的内容是有格式的。

[gmsgms]

up

[cem_uestc]

如何连续打印，对于连续进纸的针式打印机？
两页连续打印，中间留一大片空白