对话框打印,网上一搜一大堆,基本分2类:
A类: CPrintDialog.DoModal,然后在模态对话框里选打印机、打印配置;
B类:GetPrinterDeviceDefaults,调用默认打印机。
我的工作内容是理解以上2类后,再根据MSDN,实现MDF对话框后台指定打印机打印。
废话不多说,上菜~
功能:基于对话框的MFC打印(非文档视图结构),指定打印机,后台打印(不弹出对话框)
思路:
1、枚举打印机,并选择其中一个;
2、CPrintDialog实例指定到选中的打印机;
3、CPrintDialog后台打印
具体实现:
1、变量(控件)。在对话框上添加一个combobox(IDC_COMBO1,对应变量m_cboPrint)、一个edit(IDC_EDIT1),edit允许回车,多行(代码就不贴了,知道MFC应该就懂);
2、在OnInitDialog里枚举打印机设备,如果报函数未定义,加入头文件#include <winspool.h>
需要调用两次EnumPrinters函数,第一次的到结构体的大小,第二次得到打印机列表
BOOL CSuperMarkets::OnInitDialog() { // TODO: 在此添加额外的初始化代码 DWORD dwNeeded; DWORD dwReturn; DWORD dwFlag = PRINTER_ENUM_CONNECTIONS | PRINTER_ENUM_LOCAL; EnumPrinters(dwFlag, NULL, 4, NULL, 0, &dwNeeded, &dwReturn); PRINTER_INFO_4* p4; p4 = new PRINTER_INFO_4[dwNeeded]; EnumPrinters(dwFlag, NULL, 4, (PBYTE)p4, dwNeeded, &dwNeeded, &dwReturn); for (int i = 0; i<(int)dwReturn; i++) this->m_cboPrint.AddString(p4[i].pPrinterName); delete []p4; //下面是获取默认打印机 //构造打印设置对话框对象 CPrintDialog printDialog(FALSE); //获取默认打印设备的设备环境 printDialog.GetDefaults(); //获取当前打印机的名称 m_DYJ = printDialog.GetDeviceName(); }
3、操作对话框,在IDC_EDIT1里输入打印的内容,在IDC_COMBO1里选中打印机;
4、打印(我是用OK按钮打印的,大家随便)
//打印账单 void CSuperMarkets::OnBnClickedButton6() { CString strMessage; //m_DYJStr 被打印的字符串 strMessage = m_DYJStr; strMessage += "\r\n"; //添加结尾,方便后面循环读取打印数据 //this->GetDlgItem(IDC_COMBO1)->GetWindowText(strPrintDevice); //打印配置界面的按钮可用性,因为后台打印,其实这个配置没什么意义 DWORD dwFlag = PD_ALLPAGES | PD_NOPAGENUMS | PD_USEDEVMODECOPIES | PD_HIDEPRINTTOFILE; //CPrintDialog实例化,因为MFC的打印设备无关性,可以理解为这就是一台打印机 CPrintDialog pPrintdlg(FALSE, dwFlag, this); HGLOBAL hDevMode = NULL; HGLOBAL hDevNames = NULL; //获得指定打印机的配置、名字 if (GetPrinterDevice(m_DYJ.GetBuffer(0), &hDevNames, &hDevMode)) AfxGetApp()->SelectPrinter(hDevNames, hDevMode); else AfxMessageBox(_T("Failed to select custom printer")); m_DYJ.ReleaseBuffer(); //让pPrintdlg使用我们指定的打印机 pPrintdlg.m_pd.hDevMode = hDevMode; pPrintdlg.m_pd.hDevNames = hDevNames; CDC dc; //后台打印创建法,如果需要弹出打印对话框,请用DoModal dc.Attach(pPrintdlg.CreatePrinterDC()); //下面的内容网上很多,就不解释了 DOCINFO di; di.cbSize = sizeof(DOCINFO); di.lpszDocName = _T("有驱打印测试"); di.lpszDatatype = NULL; di.lpszOutput = NULL; di.fwType = 0; dc.StartDoc(&di); dc.StartPage(); dc.SetMapMode(MM_TEXT); CRect recPrint(0, 0, dc.GetDeviceCaps(LOGPIXELSX), dc.GetDeviceCaps(LOGPIXELSY)); dc.DPtoLP(&recPrint); dc.SetWindowOrg(0, 0); CFont newFont; //设置字体和字体大小 VERIFY(newFont.CreatePointFont(50, _T("宋体"), &dc)); CFont* oldFont = dc.SelectObject(&newFont); dc.SetTextAlign(TA_TOP | TA_LEFT); CString strPrint; int nIndex = 0; int x = 20; //设置侧边间距 int y = 50; CSize textSize; //根据当前字体的宽、高,后面以此高度为行高 textSize = dc.GetTextExtent(_T("00"), 2); //将IDC_EDIT1编辑框中内容打印,支持换行,一次换行等于'\r\n',所以在开头strMessage += _T("\r\n") while ((nIndex = strMessage.Find(_T("\r\n"))) > -1) { strPrint = strMessage.Left(nIndex); strMessage = strMessage.Mid(nIndex+2); dc.TextOut(x, y, strPrint); //下移一行,行高为字体高度 y += textSize.cy; } dc.SelectObject(oldFont); newFont.DeleteObject(); dc.EndPage(); dc.EndDoc(); DeleteDC(dc.Detach()); } BOOL CSuperMarkets::GetPrinterDevice(LPTSTR pszPrinterName, HGLOBAL* phDevNames, HGLOBAL* phDevMode) { // if NULL is passed, then assume we are setting app object's // devmode and devnames if (phDevMode == NULL || phDevNames == NULL) return FALSE; // Open printer HANDLE hPrinter; if (OpenPrinter(pszPrinterName, &hPrinter, NULL) == FALSE) return FALSE; // obtain PRINTER_INFO_2 structure and close printer DWORD dwBytesReturned, dwBytesNeeded; GetPrinter(hPrinter, 2, NULL, 0, &dwBytesNeeded); PRINTER_INFO_2* p2 = (PRINTER_INFO_2*)GlobalAlloc(GPTR, dwBytesNeeded); if (GetPrinter(hPrinter, 2, (LPBYTE)p2, dwBytesNeeded, &dwBytesReturned) == 0) { GlobalFree(p2); ClosePrinter(hPrinter); return FALSE; } ClosePrinter(hPrinter); // Allocate a global handle for DEVMODE HGLOBAL hDevMode = GlobalAlloc(GHND, sizeof(*p2->pDevMode) + p2->pDevMode->dmDriverExtra); ASSERT(hDevMode); DEVMODE* pDevMode = (DEVMODE*)GlobalLock(hDevMode); ASSERT(pDevMode); // copy DEVMODE data from PRINTER_INFO_2::pDevMode memcpy(pDevMode, p2->pDevMode, sizeof(*p2->pDevMode) + p2->pDevMode->dmDriverExtra); GlobalUnlock(hDevMode); // Compute size of DEVNAMES structure from PRINTER_INFO_2's data DWORD drvNameLen = lstrlen(p2->pDriverName)+1; // driver name DWORD ptrNameLen = lstrlen(p2->pPrinterName)+1; // printer name DWORD porNameLen = lstrlen(p2->pPortName)+1; // port name // Allocate a global handle big enough to hold DEVNAMES. HGLOBAL hDevNames = GlobalAlloc(GHND, sizeof(DEVNAMES) + (drvNameLen + ptrNameLen + porNameLen)*sizeof(TCHAR)); ASSERT(hDevNames); DEVNAMES* pDevNames = (DEVNAMES*)GlobalLock(hDevNames); ASSERT(pDevNames); // Copy the DEVNAMES information from PRINTER_INFO_2 // tcOffset = TCHAR Offset into structure int tcOffset = sizeof(DEVNAMES)/sizeof(TCHAR); ASSERT(sizeof(DEVNAMES) == tcOffset*sizeof(TCHAR)); pDevNames->wDriverOffset = tcOffset; memcpy((LPTSTR)pDevNames + tcOffset, p2->pDriverName, drvNameLen*sizeof(TCHAR)); tcOffset += drvNameLen; pDevNames->wDeviceOffset = tcOffset; memcpy((LPTSTR)pDevNames + tcOffset, p2->pPrinterName, ptrNameLen*sizeof(TCHAR)); tcOffset += ptrNameLen; pDevNames->wOutputOffset = tcOffset; memcpy((LPTSTR)pDevNames + tcOffset, p2->pPortName, porNameLen*sizeof(TCHAR)); pDevNames->wDefault = 0; GlobalUnlock(hDevNames); GlobalFree(p2); // free PRINTER_INFO_2 // set the new hDevMode and hDevNames *phDevMode = hDevMode; *phDevNames = hDevNames; return TRUE; }
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感谢原作者提供的源码:http://blog.csdn.net/xjkstar/article/details/25828097
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