POS机票据打印

1、票据打印工作任务：在Windows平台，通过调用CPrintDialog，实现POS机上的票据打印。设备：佳博GP-5860III最后实现的打印效果图，如下：代码主要功能：1. 调用CPrintDialog，使用默认打印机打印。2. 调用CreateFont，创建打印字体。3. StartPage EndPage完成一页文档的打印。其中关键的几点：1. 当一行显示不下产品信息内容时，如何自动换行。2. 如何调整打印字体的大小。下面是实现打印功能时，分别封装的几个函数。void CPosDemoDlgMain:PrintNote() /Get the default printer CPrint

2、Dialog dlg(FALSE); dlg.GetDefaults(); /Is a default printer set up? HDC hdcPrinter = dlg.GetPrinterDC(); if (hdcPrinter = NULL) MessageBox(_T(Printer not found!); else /Create a CDC and attach it to the default printer CDC dcPrinter; dcPrinter.Attach(hdcPrinter); /Call StartDoc() to begin printing D

3、OCINFO docinfo; memset(&docinfo, 0, sizeof(docinfo); docinfo.cbSize = sizeof(docinfo); docinfo.lpszDocName = _T(CDC:StartDoc() Code Fragment); /If it fails, complain and exit gracefully if (dcPrinter.StartDoc(&docinfo) 0) MessageBox(_T(Printer not initalized.); else /Start a page if (dcPrinter.Start

4、Page() m_hDC,10,sy,362,115,dcMem,0,0,SRCCOPY); /* :StretchBlt(pdc-m_hDC, 0, 0, 380, 170, dcMem,0,0,575,178,SRCCOPY); */ :SelectObject(dcMem,hOldBmp); :DeleteDC(dcMem); :DeleteObject(hBitmap);void CPosDemoDlgMain:printDate(CDC* pdc,INT sy) SYSTEMTIME st; INT y = sy; WCHAR wcMonth12=_T(JAN),_T(FEB),_T

5、(MAR),_T(APR),_T(MAY),_T(JUN), _T(JUL),_T(AUG),_T(SEP),_T(OCT),_T(NOV),_T(DEC); WCHAR am_pm =_T(am); CString strDate; GetLocalTime(&st); if(st.wHour 12) /Set up extension. wcscpy( am_pm, _T(pm); if(st.wHour 12) /Convert from 24-hour st.wHour -= 12; /to 12-hour clock. if(st.wHour = 0) /Set hour to 12

6、 if midnight. st.wHour = 12; strDate.Format(_T(%2d %s %4d %02d:%02d%s),st.wDay, wcMonthst.wMonth-1, st.wYear, st.wHour,st.wMinute,am_pm); pdc-TextOut(5, y, strDate, strDate.GetLength(); y += 38; pdc-MoveTo(2,y); pdc-LineTo(420,y);INT CPosDemoDlgMain:printProductList(CDC* pdc, INT sy)UINT i; INT x, y

7、 = sy; INT WIDTH = 188; INT len = 0, height, left, width; CRect rc(2,y,WIDTH,y+40); ProductList *pProduct = NULL;for (i=0; iDrawText(pProduct-wsName, -1, &rc, DT_CALCRECT|DT_LEFT|DT_TOP|DT_WORDBREAK); pdc-DrawText(pProduct-wsName, -1, &rc, DT_LEFT|DT_TOP|DT_WORDBREAK); /draw number width = 20; rc.ri

8、ght = rc.left + WIDTH; rc.right += 10; rc.right += width; rc.left = rc.right - width; pdc-DrawText(pProduct-wsNum, -1, &rc, DT_RIGHT|DT_TOP); width = 6; rc.right += 2; rc.right += width; rc.left = rc.right - width; pdc-DrawText(Lx, -1, &rc, DT_CENTER|DT_TOP); /draw price width = 70; rc.right += 2; r

9、c.right += width; rc.left = rc.right - width; pdc-DrawText(pProduct-wsPrice, -1, &rc, DT_RIGHT|DT_TOP|DT_SINGLELINE); /draw sub-total width = 80; rc.right += 2; rc.right += width; rc.left = rc.right - width; pdc-DrawText(pProduct-wsSubTotal, -1, &rc, DT_RIGHT|DT_TOP|DT_SINGLELINE); y += height + 14;

10、 /10: 如果下一行也换行，会打印乱码; 12: 不会乱码; 但为了安全起见，上下两行间隔14个像素。 pdc-MoveTo(2,y); pdc-LineTo(420,y); return y;void CPosDemoDlgMain:printTotal(CDC* pdc, INT sy)UINT i; INT x, y = sy; INT len = 0, line = 0; const INT LEFT = 2, RIGHT = 382, LINE_HEIGHT = 30; const INT TITLE_WIDTH = 100, NUM_WIDTH = 100; CRect rc(2

11、,y,220,y+LINE_HEIGHT);WCHAR wsBuffer256; rc.left = LEFT; rc.top = y; /draw Tax rc.top = y + line * LINE_HEIGHT; rc.bottom = rc.top + LINE_HEIGHT; rc.right = rc.left + TITLE_WIDTH; pdc-DrawText(LTax, -1, &rc, DT_LEFT|DT_TOP); rc.left = RIGHT - NUM_WIDTH; rc.right = RIGHT; swprintf(wsBuffer, L%d.%02d,

12、 0, 0);pdc-DrawText(wsBuffer, -1, &rc, DT_RIGHT|DT_TOP); line+; /= /draw total rc.top = y + line * LINE_HEIGHT; rc.bottom = rc.top + LINE_HEIGHT; rc.left = LEFT; rc.right = rc.left + TITLE_WIDTH; pdc-DrawText(LTotal, -1, &rc, DT_LEFT|DT_TOP); rc.left = RIGHT - NUM_WIDTH; rc.right = RIGHT;swprintf(ws

13、Buffer, L%d.%02d, gTotalPrice/100, gTotalPrice%100);pdc-DrawText(wsBuffer, -1, &rc, DT_RIGHT|DT_TOP); line+; /= /draw payment rc.top = y + line * LINE_HEIGHT; rc.bottom = rc.top + LINE_HEIGHT; rc.left = LEFT; rc.right = rc.left + TITLE_WIDTH; pdc-DrawText(LPayment, -1, &rc, DT_LEFT|DT_TOP); rc.left

14、= RIGHT - NUM_WIDTH; rc.right = RIGHT;swprintf(wsBuffer, L%d.%02d, m_Payment/100, m_Payment%100);pdc-DrawText(wsBuffer, -1, &rc, DT_RIGHT|DT_TOP); line+; /= /draw cash change rc.top = y + line * LINE_HEIGHT; rc.bottom = rc.top + LINE_HEIGHT; rc.left = LEFT; rc.right = rc.left + TITLE_WIDTH; pdc-DrawText(LChange, -1, &rc, DT_LEFT|DT_TOP); rc.left = RIGHT - NUM_WIDTH; rc.right = RIGHT;if (m_Payment DrawText(wsBuff