打印出错：0x6E4C420D (winspool.drv) (MyPrint.exe 中)处有未经处理的异常: 0xC0000005: 读取位置 0xCDCD

[～Ethan～]

我想做个打印的helloworld程序，出现以下报错。各位大神帮我看看。谢谢了！

[zgl7903]

图 看 不 清 楚

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void CMyPrintDlg::OnBnClickedOk()
{
	CDC *m_pDC = GetDC();
	double screenx, screeny;
	screenx = m_pDC->GetDeviceCaps(LOGPIXELSX);
	screeny = m_pDC->GetDeviceCaps(LOGPIXELSY);
	CPrintDialog m_printdlg(FALSE);
	if (m_printdlg.DoModal() == IDOK)
	{
		CDC *dc = GetDC();
		dc->Attach(m_printdlg.GetPrinterDC());
		dc->m_hDC = m_printdlg.GetPrinterDC();
		double printx, printy;
		printx = dc->GetDeviceCaps(LOGPIXELSX);
		printy = dc->GetDeviceCaps(LOGPIXELSY);
		double ratex, ratey;
		ratex = printx / screenx;
		ratey = printy / screeny;
		DOCINFOW *ps = new DOCINFO;
		ps->lpszDocName = char2wchar("printstart");
		dc->CDC::StartDoc(ps);
		dc->TextOut((int)ratex * 5, (int)ratex * 10, (CString)"hello world");
		dc->CDC::EndDoc();
	}
	// TODO: 在此添加控件通知处理程序代码
	CDialogEx::OnOK();
}

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这是源代码

引用 3 楼 qq_42580732 的回复:

void CMyPrintDlg::OnBnClickedOk()
{
	CDC *m_pDC = GetDC();
	double screenx, screeny;
	screenx = m_pDC->GetDeviceCaps(LOGPIXELSX);
	screeny = m_pDC->GetDeviceCaps(LOGPIXELSY);
	CPrintDialog m_printdlg(FALSE);
	if (m_printdlg.DoModal() == IDOK)
	{
		CDC *dc = GetDC();
		dc->Attach(m_printdlg.GetPrinterDC());
		dc->m_hDC = m_printdlg.GetPrinterDC();
		double printx, printy;
		printx = dc->GetDeviceCaps(LOGPIXELSX);
		printy = dc->GetDeviceCaps(LOGPIXELSY);
		double ratex, ratey;
		ratex = printx / screenx;
		ratey = printy / screeny;
		DOCINFOW *ps = new DOCINFO;
		ps->lpszDocName = char2wchar("printstart");
		dc->CDC::StartDoc(ps);
		dc->TextOut((int)ratex * 5, (int)ratex * 10, (CString)"hello world");
		dc->CDC::EndDoc();
	}
	// TODO: 在此添加控件通知处理程序代码
	CDialogEx::OnOK();
}

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谢谢大犇！！

[Eleven]

Debug模式下F10单步看看那个函数执行失败了？

[zgl7903]

void CDlg1Dlg::OnButton2() 
{
  // TODO: Add your control notification handler code here
	
  CPrintDialog dlg(TRUE, PD_ALLPAGES, this);

  dlg.m_pd.nMinPage = 1;
  dlg.m_pd.nMaxPage = 10;
  dlg.m_pd.nFromPage = 1;
  dlg.m_pd.nToPage = 10;

  if(dlg.DoModal() == IDOK)
  {
    HDC hDC = dlg.CreatePrinterDC();

    DOCINFO docInfo = { sizeof(DOCINFO), _T("MyPrintDOC") };
    
    StartDoc(hDC, &docInfo);

    for(int iPage=dlg.m_pd.nFromPage-1; iPage<dlg.m_pd.nToPage; iPage++)
    {
      StartPage(hDC);

      //在DC上绘制
      {
        TCHAR szText[64];
        _stprintf_s(szText, _T("PAGE_%d"), iPage+1);
        TextOut(hDC, 0, 0, szText, _tcslen(szText));
      }

      EndPage(hDC);
    }

    EndDoc(hDC);

    DeleteDC(hDC);
  }
}