推荐下 不错。
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d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
- // 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;
3、 *** 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)
- // TODO: 在此添加控件通知处理程序代码
- // CDialogEx::OnOK();
- this->UpdateData();
- CString strMessage;
- CString strPrintDevice;
- this->GetDlgItem(IDC_EDIT1)->GetWindowTextW(strMessage);
- strMessage += _T("\r\n"); //添加结尾,方便后面循环读取打印数据
- this->GetDlgItem(IDC_COMBO1)->GetWindowTextW(strPrintDevice);
- DWORD dwFlag = PD_ALLPAGES | PD_NOPAGENUMS | PD_USEDEVMODECOPIES | PD_HIDEPRINTTOFILE; //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
- CPrintDialog pPrintdlg(FALSE, dwFlag, this); //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
- HGLOBAL hDevMode = NULL;
- HGLOBAL hDevNames = NULL;
- if (GetPrinterDevice(strPrintDevice.GetBuffer(0), &hDevNames, &hDevMode)) //获得指定打印机的配置、名字
- AfxGetApp()->SelectPrinter(hDevNames, hDevMode);
- else
- AfxMessageBox(_T("Failed to select custom printer"));
- strPrintDevice.ReleaseBuffer();
- pPrintdlg.m_pd.hDevMode = hDevMode; //让pPrintdlg使用我们指定的打印机
- pPrintdlg.m_pd.hDevNames = hDevNames;
- CDC dc;
- dc.Attach(pPrintdlg.CreatePrinterDC()); //后台打印创建法,如果需要d出打印对话框,请用DoModal
- DOCINFO di; //下面的内容网上很多,就不解释了
- di.cbSize = sizeof(DOCINFO);
- di.lpszDocName = _T("有驱打印测试");
- di.lpszDatatype = NULL;
- di.lpszOutput = NULL;
- di.fwType = 0;
- dc.StartDocW(&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;
- VERIFY(newFont.CreatePointFont(120, _T("宋体"), &dc));
- CFont* oldFont = dc.SelectObject(&newFont);
- dc.SetTextAlign(TA_TOP | TA_LEFT);
- CString strPrint;
- int nIndex = 0;
- int x = 50;
- int y = 50;
- CSize textSize;
- textSize = dc.GetTextExtent(_T("00"), 2); //根据当前字体的宽、高,后面以此高度为行高
- while ((nIndex = strMessage.Find(_T("\r\n"))) > -1) //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")
- {
- strPrint = strMessage.Left(nIndex);
- strMessage = strMessage.Mid(nIndex+2);
- dc.TextOutW(x, y, strPrint);
- y += textSize.cy; //下移一行,行高为字体高度
- }
- dc.SelectObject(oldFont);
- newFont.DeleteObject();
- dc.EndPage();
- dc.EndDoc();
- DeleteDC(dc.Detach());
关于GetPrinterDevice,来自微软的一篇文章,点我跳转
代码也贴出来
- BOOL CMFCApplication2Dlg::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;
- }
基本上是完整代码了,如果有内存错误,请联系我
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