基于对话框的图像打印程序

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DialogPrint

1 dialog based->DialogPrint

2 添加button, ID:IDC_PRINTIMG, Caption：打印图像

3 双击button,点击ok，建立OnPrintimg ()函数

4 添加新类CMainFrame.

ClassNiew->DialogPrint classes->右键New Class-> Name：CMainFrame Base class:CFrameWnd.点击OK。

5 新带参数的构造函数.

MainFrame.h中

添加

public：

CMainFrame(DRAWFUN pDraw,CWnd*pOldW,CWnd* pCallW,BOOL bDirect,LPCTSTR stTitle=NULL);

同时添加

Public:

CWnd* pOldWnd;

CWnd* pCallWnd;

DRAWFUN Draw;

BOOL bDirectPrint;

protected:

CStatusBar m_wndStatusBar;

CToolBar m_wndToolBar;

CWrapperView *m_pView;

在MainFrame.cpp中添加

CMainFrame::CMainFrame(DRAWFUN pDraw,CWnd*pOldW,CWnd* pCallW,BOOL bDirect,LPCTSTR stTitle)

{

Draw=pDraw;

pOldWnd=pOldW;

pCallWnd=pCallW;

bDirectPrint=bDirect;

CString ss;

if(stTitle!=NULL)

ss=_T(stTitle);

else

{

pOldW->GetWindowText(ss);

if(!ss.IsEmpty())

ss=ss+_T(" (预览)");

else

ss=ss+_T("打印预览");

}

if(!Create(NULL,ss,WS_OVERLAPPEDWINDOW | FWS_ADDTOTITLE,CRect(200,200,500,500)))

// if(!Create(NULL,ss,WS_OVERLAPPEDWINDOW ))//| FWS_ADDTOTITLE,CRect(200,200,500,500)))

TRACE0("Failed to create view window/n");

}

6 ClassView-> CMainFrame->右键Add Virtual Function…->OnCmdMsg->Add and Edit.

转到实现函数里添加

// let the view have first crack at the command

if (m_pView->OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))

return TRUE;

ClassView-> CMainFrame->右键Add Virtual Function…->PreCreateWindow->Add and Edit.

转到实现函数里添加

if( !CFrameWnd::PreCreateWindow(cs) )

return FALSE;

// TODO: Modify the Window class or styles here by modifying

// the CREATESTRUCT cs

cs.dwExStyle &= ~WS_EX_CLIENTEDGE;

cs.lpszClass = AfxRegisterWndClass(0);

return TRUE;

并注释掉

// return CFrameWnd::PreCreateWindow(cs);

7 ClassView视图->CMainFrame->右键Add Windows Message Handle…->WM_CREATE-> Add and Edit. 转到实现函数里添加

CCreateContext context;

context.m_pNewViewClass = RUNTIME_CLASS(CWrapperView);

context.m_pCurrentFrame = this;

context.m_pCurrentDoc = NULL;

context.m_pLastView = NULL;

m_pView = STATIC_DOWNCAST(CWrapperView, CreateView(&context)); //CreateView(&context);

if(m_pView != NULL)

{

if(!bDirectPrint)

m_pView->ShowWindow(SW_SHOW);

SetActiveView(m_pView);

}

SetIcon(pOldWnd->GetIcon(FALSE),FALSE);

SetIcon(pOldWnd->GetIcon(TRUE),TRUE);

ShowWindow(SW_MAXIMIZE);

CWinApp *pApp=AfxGetApp();

pApp->m_pMainWnd=this;

if(bDirectPrint)

{

m_pView->SendMessage(WM_COMMAND, ID_FILE_PRINT);

}

else

{

// m_pView->OnFilePrintPreview(this);

pOldWnd->ShowWindow(SW_HIDE);

}

8 添加新类CWrapperView.

ClassNiew->DialogPrint classes->右键New Class->弹出对话框中Name：CWrapperView Base class: CView.->OK。

CWrapperView.h中

将构造函数和析构函数全改为

public:

CWrapperView();

virtual ~CWrapperView();

CWrapperView.cpp构造函数中

m_pFrameWnd = NULL;

HDC hDC=::GetDC(m_hWnd);

SetMapMode(hDC,MM_ISOTROPIC);

10 ClassView视图->CWrapperView->右键Add Virtual Function…->OnPrint->Add and Edit.

转到实现函数里添加

if(pDC)

{

CMainFrame* pf=(CMainFrame*)::AfxGetMainWnd();

(*pf->Draw)(pDC,pInfo,(void*)pf->pCallWnd);

}

并注释掉

// CView::OnPrint(pDC, pInfo);

ClassView视图->CWrapperView->右键Add Virtual Function…-> OnPreparePrinting ->Add and Edit.

转到实现函数里添加

return DoPreparePrinting(pInfo);

并注释掉

// return CView::OnPreparePrinting(pInfo);

Add Virtual Function…-> OnEndPrinting ->Add and Edit.

11 CWrapperView.cpp中寻找段落

BEGIN_MESSAGE_MAP(CWrapperView, CView)

//{{AFX_MSG_MAP(CWrapperView)

// NOTE - the ClassWizard will add and remove mapping macros here.

ON_COMMAND(ID_FILE_PRINT, OnFilePrint)

//}}AFX_MSG_MAP

END_MESSAGE_MAP()

其中ON_COMMAND(ID_FILE_PRINT, OnFilePrint)为添加内容。

CWrapperView.h中寻找段落

protected:

//{{AFX_MSG(CWrapperView)

// NOTE - the ClassWizard will add and remove member functions here.

afx_msg void OnFilePrint();

//}}AFX_MSG

DECLARE_MESSAGE_MAP()

其中afx_msg void OnFilePrint();为添加内容。

12 在主对话框头文件DialogPrintDlg.h中添加

#include "mainframe.h"

13 在DialogPrintDlg.cpp添加

// CDialogPrintDlg dialog

void Drawf(CDC* pDC,CPrintInfo* pInfo,void* pVoid=NULL);

同时添加

void Drawf(CDC* pDC,CPrintInfo* pInfo,void* pVoid)

{

((CControlDlg*)pVoid)->OnPrint(pDC,pInfo);

}

14 在OnPrintimg ()中添加

m_PreFrame = new CMainFrame(Drawf,this,this,TRUE);

15 在MainFrame.h中添加

#include "wrapperview.h"

16 在StdAfx.h中添加

typedef void(*DRAWFUN)(CDC* pDC,CPrintInfo* pInfo,void* pVoid=NULL);

17 ClassView->CDialogPrintDlg右键->Add Member Function…->void OnPrint(CDC* pDC,CPrintInfo* pInfo)->OK

实现函数内添加（图像的加载方式各异，本例实现方法为CxImage类）

CDC MemDC; // 内存设备环境指针，在视的整个存在过程都将存在

CBitmap Bitmap,*pOldBmp,Bitmap2;

CRect Source, Dest,Source2, Dest2; // 记录源位图尺寸和最终显示尺寸

BITMAP bm;

CxImage showimage;

showimage.Load("E://bear.bmp",CXIMAGE_SUPPORT_BMP);

///////////////////////////////////////////////////////////////

if(MemDC.GetSafeHdc() == NULL)

{

HBITMAP hbitmap=showimage.MakeBitmap();

Bitmap.Attach(hbitmap);

Bitmap.GetObject(sizeof(bm),&bm);

MemDC.CreateCompatibleDC(pDC);

pOldBmp=MemDC.SelectObject(&Bitmap);

Source.top=0;

Source.left=0;

Source.right= bm.bmWidth;

Source.bottom = bm.bmHeight;

Dest = Source;

}

CDC* DC=GetWindowDC();

int iLogPixelX=DC->GetDeviceCaps(LOGPIXELSX);

int iLogPixelY=DC->GetDeviceCaps(LOGPIXELSY);

pDC->DPtoLP(&Dest);

if(pDC->IsPrinting())

{

Dest.left=(int)(Dest.left*((double)pDC->GetDeviceCaps(LOGPIXELSX))/iLogPixelX);

Dest.right=(int)(Dest.right*((double)pDC->GetDeviceCaps(LOGPIXELSX))/iLogPixelX);

Dest.top=(int)(Dest.top*((double)pDC->GetDeviceCaps(LOGPIXELSY))/iLogPixelY);

Dest.bottom=(int)(Dest.bottom*((double)pDC->GetDeviceCaps(LOGPIXELSY))/iLogPixelY);

}

pDC->StretchBlt(Dest.left, Dest.top, Dest.right, Dest.bottom,

&MemDC, Source.left, Source.top, Source.right,Source.bottom, SRCCOPY);

//textout

CString strPrint=_T("The image is printed!");

CFont m_font,*OldFont;

m_font.CreatePointFont(800,"隶书");

OldFont=pDC->SelectObject(&m_font);

pDC->TextOut(Dest.right/2,Dest.bottom,strPrint);

18 DialogPrintDlg.h中添加

Public：

CMainFrame *m_PreFrame;

19 WrapperView.cpp中#include "MainFrame.h"

至于架构理论上为什么这样，暂时我也没搞明白，基于对话框的打印还是得通过一个Frame和View实现，我也是根据几篇文章以及论文，还有几个例子捣鼓出来的，对于出处，如有雷同引用，敬请海涵或联系。反正能实现基于对话框的图像打印功能了，只不过是单幅图像的打印，不能实现多页打印，在此基础上可以进行扩展，重载CWrapperView几个打印函数，可以实现多页或者预览打印吧，不过没研究，想做的可以在这个程序的基础上设上断点debug下，会走到底层的打印函数去，可能对于重载有帮助吧。