MFC对话框使用CPrintDialog实现打印，指定打印机、后台打印

http://blog.csdn.net/xjkstar/article/details/25828097

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

 // 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、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）

 // 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，如果需要弹出打印对话框，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