转载网址：http://www.cnblogs.com/johnpher/archive/2012/10/18/2728936.html
1.创建MFC对话框工程，选择在共享库中调用。
2.添加文件：
MainFrm.h, MyPreviewView.h, WrapperView.h, MainFrm.cpp, WrapperView.cpp
分别为：
MainFrm.h
1 // MainFrm.h : interface of the CMainFrame class 2 // 3 ///// 4 5 #if !defined(AFX_MAINFRM_H__5C3F89A6_932E_11D3_8420_FC56F1C91E86__INCLUDED_) 6 #define AFX_MAINFRM_H__5C3F89A6_932E_11D3_8420_FC56F1C91E86__INCLUDED_ 7 8 #if _MSC_VER > 1000 9 #pragma once 10 #endif // _MSC_VER > 1000 11 #include "wrapperview.h" 12 13 class CMainFrame : public CFrameWnd 14 { 15 public: 16 CMainFrame(DRAWFUN pDraw,CWnd*pOldW,CWnd* pCallW,BOOL bDirect,LPCTSTR stTitle=NULL); 17 CWnd* pOldWnd; 18 CWnd* pCallWnd; 19 DRAWFUN Draw; 20 BOOL bDirectPrint; 21 protected: 22 DECLARE_DYNAMIC(CMainFrame) 23 public: 24 // Overrides 25 // ClassWizard generated virtual function overrides 26 //{{AFX_VIRTUAL(CMainFrame) 27 virtual BOOL PreCreateWindow(CREATESTRUCT& cs); 28 virtual BOOL OnCmdMsg(UINT nID, int nCode, void* pExtra, AFX_CMDHANDLERINFO* pHandlerInfo); 29 //}}AFX_VIRTUAL 30 // Implementation 31 public: 32 virtual ~CMainFrame(); 33 #ifdef _DEBUG 34 virtual void AssertValid() const; 35 virtual void Dump(CDumpContext& dc) const; 36 #endif 37 38 protected: // control bar embedded members 39 CStatusBar m_wndStatusBar; 40 CToolBar m_wndToolBar; 41 CWrapperView *m_pView; 42 43 // Generated message map functions 44 protected: 45 //{{AFX_MSG(CMainFrame) 46 afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct); 47 //}}AFX_MSG 48 DECLARE_MESSAGE_MAP() 49 public: 50 afx_msg void OnClose(); 51 }; 52 ///// 53 //{{AFX_INSERT_LOCATION}} 54 // Microsoft Visual C++ will insert additional declarations immediately before the previous line. 55 #endif // !defined(AFX_MAINFRM_H__5C3F89A6_932E_11D3_8420_FC56F1C91E86__INCLUDED_)
MyPreviewView.h
//MyPreviewView.h #if !defined(AFX_MYPREVIEWVIEW_H__9FCA8680_907C_11D3_8412_9D0C7145F5C4__INCLUDED_) #define AFX_MYPREVIEWVIEW_H__9FCA8680_907C_11D3_8412_9D0C7145F5C4__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 // MyPreviewView.h : header file // #include <afxpriv.h> ///// // CMyPreviewView view class CMyPreviewView : public CPreviewView { protected: CMyPreviewView(); // protected constructor used by dynamic creation virtual ~CMyPreviewView(); DECLARE_DYNCREATE(CMyPreviewView) public: friend class CWrapperView; // Overrides // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CMyPreviewView) protected: virtual void OnDraw(CDC* pDC); // overridden to draw this view virtual void OnEndPrintPreview(CDC* pDC, CPrintInfo* pInfo, POINT point, CPreviewView* pView); //}}AFX_VIRTUAL // Implementation protected: #ifdef _DEBUG virtual void AssertValid() const; virtual void Dump(CDumpContext& dc) const; #endif virtual void OnActivateView(BOOL bActivate,CView* pActivateView, CView* pDeactiveView); // Generated message map functions //{{AFX_MSG(CMyPreviewView) afx_msg void OnPreviewClose(); afx_msg void OnPreviewPrint(); // NOTE - the ClassWizard will add and remove member functions here. //}}AFX_MSG friend BOOL CALLBACK _AfxMyPreviewCloseProc(CFrameWnd* pFrameWnd); DECLARE_MESSAGE_MAP() }; ///// //{{AFX_INSERT_LOCATION}} // Microsoft Visual C++ will insert additional declarations immediately before the previous line. #endif // !defined(AFX_MYPREVIEWVIEW_H__9FCA8680_907C_11D3_8412_9D0C7145F5C4__INCLUDED_)
WrapperView.h
1 //WrapperView.h 2 3 #if !defined(AFX_WRAPPERVIEW_H__AC579D20_8E3D_11D3_8410_E1CD9A2C01DC__INCLUDED_) 4 #define AFX_WRAPPERVIEW_H__AC579D20_8E3D_11D3_8410_E1CD9A2C01DC__INCLUDED_ 5 6 #if _MSC_VER > 1000 7 #pragma once 8 #endif // _MSC_VER > 1000 9 // WrapperView.h : header file 10 // 11 12 #include "MyPreviewView.h" 13 #include "MainFrm.h" 14 15 ///// 16 // CWrapperView view 17 18 class CWrapperView : public CScrollView 19 { 20 protected: 21 DECLARE_DYNCREATE(CWrapperView) 22 23 CFrameWnd* m_pFrameWnd; 24 public: 25 CWrapperView(); 26 virtual ~CWrapperView(); 27 28 virtual void OnEndPrinting(CDC* pDC, CPrintInfo* pInfo); 29 void OnFilePrintPreview(CFrameWnd *pFrame); 30 BOOL DoPrintPreview(UINT nIDResource, CView* pPrintView,CRuntimeClass* pPreviewViewClass, CPrintPreviewState* pState); 31 void OnEndPrintPreview(CDC* pDC, CPrintInfo* pInfo,POINT, CMyPreviewView* pView); 32 // Overrides 33 // ClassWizard generated virtual function overrides 34 //{{AFX_VIRTUAL(CWrapperView) 35 protected: 36 virtual void OnPrint(CDC* pDC,CPrintInfo* pInfo); // overridden to draw this view 37 virtual void OnDraw(CDC* pDC); // overridden to draw this view 38 virtual BOOL OnPreparePrinting(CPrintInfo* pInfo); 39 //}}AFX_VIRTUAL 40 41 // Implementation 42 protected: 43 44 #ifdef _DEBUG 45 virtual void AssertValid() const; 46 virtual void Dump(CDumpContext& dc) const; 47 #endif 48 49 // Generated message map functions 50 protected: 51 //{{AFX_MSG(CWrapperView) 52 // NOTE - the ClassWizard will add and remove member functions here. 53 afx_msg void OnFilePrint(); 54 //}}AFX_MSG 55 DECLARE_MESSAGE_MAP() 56 }; 57 58 ///// 59 60 //{{AFX_INSERT_LOCATION}} 61 // Microsoft Visual C++ will insert additional declarations immediately before the previous line. 62 63 #endif // !defined(AFX_WRAPPERVIEW_H__AC579D20_8E3D_11D3_8410_E1CD9A2C01DC__INCLUDED_)
MainFrm.cpp
1 // MainFrm.cpp : implementation of the CMainFrame class 2 // 3 4 #include "stdafx.h" 5 #include "MainFrm.h" 6 7 #ifdef _DEBUG 8 #define new DEBUG_NEW 9 #undef THIS_FILE 10 static char THIS_FILE[] = __FILE__; 11 #endif 12 13 14 ///// 15 // CMainFrame 16 17 IMPLEMENT_DYNAMIC(CMainFrame, CFrameWnd) 18 19 BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd) 20 //{{AFX_MSG_MAP(CMainFrame) 21 ON_WM_CREATE() 22 ON_WM_CLOSE() 23 //}}AFX_MSG_MAP 24 END_MESSAGE_MAP() 25 26 static UINT indicators[] = 27 { 28 ID_SEPARATOR, // status line indicator 29 ID_INDICATOR_CAPS, 30 ID_INDICATOR_NUM, 31 ID_INDICATOR_SCRL, 32 }; 33 34 ///// 35 // CMainFrame construction/destruction 36 37 CMainFrame::CMainFrame(DRAWFUN pDraw,CWnd*pOldW,CWnd* pCallW,BOOL bDirect,LPCTSTR stTitle) 38 { 39 // TODO: add member initialization code here 40 Draw =pDraw; 41 pOldWnd =pOldW; 42 pCallWnd=pCallW; 43 bDirectPrint=bDirect; 44 CString ss; 45 if(stTitle!=NULL) 46 ss=stTitle; 47 else 48 { 49 pOldW->GetWindowText(ss); 50 if(!ss.IsEmpty()) 51 ss=ss+_T(" (预览)"); 52 else 53 ss=ss+_T("打印预览"); 54 } 55 56 if(!Create(NULL,ss,WS_OVERLAPPEDWINDOW | FWS_ADDTOTITLE,CRect(200,200,500,500))) 57 TRACE0("Failed to create view window\n"); 58 } 59 60 61 CMainFrame::~CMainFrame() 62 { 63 pOldWnd->ShowWindow(SW_SHOW); 64 65 pCallWnd=NULL; 66 pOldWnd =NULL; 67 bDirectPrint=FALSE; 68 } 69 70 int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct) 71 { 72 if (CFrameWnd::OnCreate(lpCreateStruct) == -1) 73 return -1; 74 75 CCreateContext context; 76 context.m_pNewViewClass = RUNTIME_CLASS(CWrapperView); 77 context.m_pCurrentFrame = this; 78 context.m_pCurrentDoc = NULL; 79 context.m_pLastView = NULL; 80 m_pView = STATIC_DOWNCAST(CWrapperView, CreateView(&context)); //CreateView(&context); 81 if(NULL!=m_pView){ 82 if(!bDirectPrint) 83 m_pView->ShowWindow(SW_SHOW); 84 SetActiveView(m_pView); 85 } 86 SetIcon(pOldWnd->GetIcon(FALSE),FALSE); 87 SetIcon(pOldWnd->GetIcon(TRUE),TRUE); 88 ShowWindow(SW_MAXIMIZE); 89 90 CWinApp *pApp=AfxGetApp(); 91 pApp->m_pMainWnd=this; 92 if(bDirectPrint) 93 { 94 m_pView->SendMessage(WM_COMMAND, ID_FILE_PRINT); 95 } 96 else 97 { 98 m_pView->OnFilePrintPreview(this); 99 pOldWnd->ShowWindow(SW_HIDE); 100 } 101 102 return 0; 103 } 104 105 BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs) 106 { 107 if( !CFrameWnd::PreCreateWindow(cs) ) 108 return FALSE; 109 // TODO: Modify the Window class or styles here by modifying 110 // the CREATESTRUCT cs 111 112 cs.dwExStyle &= ~WS_EX_CLIENTEDGE; 113 cs.lpszClass = AfxRegisterWndClass(0); 114 return TRUE; 115 } 116 117 ///// 118 // CMainFrame diagnostics 119 120 #ifdef _DEBUG 121 void CMainFrame::AssertValid() const 122 { 123 CFrameWnd::AssertValid(); 124 } 125 126 void CMainFrame::Dump(CDumpContext& dc) const 127 { 128 CFrameWnd::Dump(dc); 129 } 130 131 #endif //_DEBUG 132 133 ///// 134 // CMainFrame message handlers 135 136 BOOL CMainFrame::OnCmdMsg(UINT nID, int nCode, void* pExtra, AFX_CMDHANDLERINFO* pHandlerInfo) 137 { 138 // let the view have first crack at the command 139 if (m_pView->OnCmdMsg(nID, nCode, pExtra, pHandlerInfo)) 140 return TRUE; 141 142 // otherwise, do default handling 143 return CFrameWnd::OnCmdMsg(nID, nCode, pExtra, pHandlerInfo); 144 } 145 146 147 148 // 149 // 源代码中使用的框架销毁函数有bug，这里暂时不使用正常销毁-AWEN 150 void CMainFrame::OnClose() 151 { 152 // TODO: 在此添加消息处理程序代码和/或调用默认值 153 154 //CFrameWnd::OnClose(); 155 CFrameWnd::DestroyWindow(); 156 }
WrapperView.cpp
1 // WrapperView.cpp : implementation file 2 // 3 4 #include "stdafx.h" 5 #include "WrapperView.h" 6 #include "MyPreviewView.h" 7 #include "MainFrm.h" 8 9 #ifdef _DEBUG 10 #define new DEBUG_NEW 11 #undef THIS_FILE 12 static char THIS_FILE[] = __FILE__; 13 #endif 14 15 BOOL CALLBACK _AfxMyPreviewCloseProc(CFrameWnd* pFrameWnd); 16 17 ///// 18 // CWrapperView 19 20 IMPLEMENT_DYNCREATE(CWrapperView, CScrollView) 21 22 CWrapperView::CWrapperView() 23 { 24 m_pFrameWnd = NULL; 25 m_nMapMode = MM_TEXT; //default 26 } 27 28 CWrapperView::~CWrapperView() 29 { 30 } 31 32 33 BEGIN_MESSAGE_MAP(CWrapperView, CScrollView) 34 //{{AFX_MSG_MAP(CWrapperView) 35 // NOTE - the ClassWizard will add and remove mapping macros here. 36 ON_COMMAND(ID_FILE_PRINT, OnFilePrint) 37 //}}AFX_MSG_MAP 38 END_MESSAGE_MAP() 39 40 void CWrapperView::OnDraw(CDC *pDC) 41 { 42 43 } 44 45 void CWrapperView::OnPrint(CDC* pDC,CPrintInfo* pInfo) 46 { 47 if(pDC) 48 { 49 CMainFrame* pf=(CMainFrame*)::AfxGetMainWnd(); 50 (*pf->Draw)(pDC,pInfo,(void*)pf->pCallWnd); 51 } 52 } 53 54 55 ///// 56 // CWrapperView diagnostics 57 58 #ifdef _DEBUG 59 void CWrapperView::AssertValid() const 60 { 61 CView::AssertValid(); 62 } 63 64 void CWrapperView::Dump(CDumpContext& dc) const 65 { 66 CView::Dump(dc); 67 } 68 #endif //_DEBUG 69 70 ///// 71 // CWrapperView message handlers 72 73 BOOL CALLBACK _AfxMyPreviewCloseProc(CFrameWnd* pFrameWnd) 74 { 75 ASSERT_VALID(pFrameWnd); 76 77 CMyPreviewView* pView = (CMyPreviewView*) pFrameWnd->GetDlgItem(AFX_IDW_PANE_FIRST); 78 ASSERT_KINDOF(CPreviewView, pView); 79 80 pView->OnPreviewClose(); 81 return FALSE; 82 } 83 84 BOOL CWrapperView::OnPreparePrinting(CPrintInfo* pInfo) 85 { 86 // default preparation 87 return DoPreparePrinting(pInfo); 88 } 89 90 void CWrapperView::OnFilePrint() 91 { 92 CMainFrame* pf=(CMainFrame*)::AfxGetMainWnd(); 93 if(pf->bDirectPrint) 94 pf->ShowWindow(SW_HIDE); 95 CView::OnFilePrint(); 96 if(pf->bDirectPrint) 97 { 98 CWinApp *pApp=AfxGetApp(); 99 pApp->m_pMainWnd=pf->pOldWnd; 100 pf->DestroyWindow(); 101 } 102 } 103 104 105 void CWrapperView::OnFilePrintPreview(CFrameWnd *pFrame) 106 { 107 m_pFrameWnd = pFrame; 108 109 CPrintPreviewState* pState = new CPrintPreviewState; 110 pState->lpfnCloseProc = _AfxMyPreviewCloseProc; 111 112 if (!DoPrintPreview(AFX_IDD_PREVIEW_TOOLBAR, this,RUNTIME_CLASS(CMyPreviewView), pState)) 113 { 114 115 TRACE0("Error: DoPrintPreview failed.\n"); 116 AfxMessageBox(AFX_IDP_COMMAND_FAILURE); 117 delete pState; 118 } 119 } 120 121 BOOL CWrapperView::DoPrintPreview(UINT nIDResource, CView* pPrintView,CRuntimeClass* pPreviewViewClass, CPrintPreviewState* pState) 122 { 123 ASSERT_VALID_IDR(nIDResource); 124 ASSERT_VALID(pPrintView); 125 ASSERT(pPreviewViewClass != NULL); 126 ASSERT(pPreviewViewClass->IsDerivedFrom(RUNTIME_CLASS(CPreviewView))); 127 ASSERT(pState != NULL); 128 129 ASSERT(m_pFrameWnd != NULL); 130 CFrameWnd* pParent = m_pFrameWnd; //STATIC_DOWNCAST(CFrameWnd, AfxGetMainWnd()); // 131 ASSERT_VALID(pParent); 132 133 CCreateContext context; 134 context.m_pCurrentFrame = pParent; 135 context.m_pCurrentDoc = GetDocument(); 136 context.m_pLastView = this; 137 138 // Create the preview view object 139 CMyPreviewView* pView = (CMyPreviewView*)pPreviewViewClass->CreateObject(); 140 if (pView == NULL) 141 { 142 TRACE0("Error: Failed to create preview view.\n"); 143 return FALSE; 144 } 145 ASSERT_KINDOF(CPreviewView, pView); 146 pView->m_pPreviewState = pState; // save pointer 147 148 pParent->OnSetPreviewMode(TRUE, pState); // Take over Frame Window 149 150 //Create the toolbar from the dialog resource 151 pView->m_pToolBar = new CDialogBar; 152 if (!pView->m_pToolBar->Create(pParent, MAKEINTRESOURCE(nIDResource), 153 CBRS_TOP, AFX_IDW_PREVIEW_BAR)) 154 { 155 TRACE0("Error: Preview could not create toolbar dialog.\n"); 156 pParent->OnSetPreviewMode(FALSE, pState); // restore Frame Window 157 delete pView->m_pToolBar; // not autodestruct yet 158 pView->m_pToolBar = NULL; 159 pView->m_pPreviewState = NULL; // do not delete state structure 160 delete pView; 161 return FALSE; 162 } 163 pView->m_pToolBar->m_bAutoDelete = TRUE; // automatic cleanup 164 165 if (!pView->Create(NULL, NULL, AFX_WS_DEFAULT_VIEW, 166 CRect(0,0,0,0), pParent, AFX_IDW_PANE_FIRST, &context)) 167 { 168 TRACE0("Error: couldn't create preview view for frame.\n"); 169 pParent->OnSetPreviewMode(FALSE, pState); // restore Frame Window 170 pView->m_pPreviewState = NULL; // do not delete state structure 171 delete pView; 172 return FALSE; 173 } 174 175 pState->pViewActiveOld = pParent->GetActiveView(); 176 CWrapperView* pActiveView = (CWrapperView*)pParent->GetActiveFrame()->GetActiveView(); 177 if (pActiveView != NULL) 178 pActiveView->OnActivateView(FALSE, pActiveView, pActiveView); 179 180 if (!pView->SetPrintView(pPrintView)) 181 { 182 pView->OnPreviewClose(); 183 return TRUE; // signal that OnEndPrintPreview was called 184 } 185 186 pParent->SetActiveView(pView); // set active view - even for MDI 187 188 // update toolbar and redraw everything 189 pView->m_pToolBar->SendMessage(WM_IDLEUPDATECMDUI, (WPARAM)TRUE); 190 pParent->RecalcLayout(); // position and size everything 191 pParent->UpdateWindow(); 192 193 return TRUE; 194 } 195 196 // OnEndPrintPreview is here for swap tuning reasons 197 // (see viewprev.cpp for complete preview mode implementation) 198 void CWrapperView::OnEndPrintPreview(CDC* pDC, CPrintInfo* pInfo,POINT, CMyPreviewView* pView) 199 { 200 ASSERT_VALID(pDC); 201 ASSERT_VALID(pView); 202 ASSERT(m_pFrameWnd != NULL); 203 204 if (pView->m_pPrintView != NULL) 205 OnEndPrinting(pDC, pInfo); 206 207 CFrameWnd* pParent = m_pFrameWnd; 208 ASSERT_VALID(pParent); 209 210 // restore the old main window 211 pParent->OnSetPreviewMode(FALSE, pView->m_pPreviewState); 212 213 // Force active view back to old one 214 pParent->SetActiveView(pView->m_pPreviewState->pViewActiveOld); 215 if (pParent != GetParentFrame()) 216 OnActivateView(TRUE, this, this); // re-activate view in real frame 217 pView->DestroyWindow(); // destroy preview view 218 // C++ object will be deleted in PostNcDestroy 219 220 // restore main frame layout and idle message 221 pParent->RecalcLayout(); 222 pParent->SendMessage(WM_SETMESSAGESTRING, (WPARAM)AFX_IDS_IDLEMESSAGE, 0L); 223 pParent->UpdateWindow(); 224 } 225 226 void CWrapperView::OnEndPrinting(CDC* pDC, CPrintInfo* pInfo) 227 { 228 CView::OnEndPrinting(pDC, pInfo); 229 } 230 231 / 232 233 IMPLEMENT_DYNCREATE(CMyPreviewView, CPreviewView) 234 235 CMyPreviewView::CMyPreviewView() 236 { 237 } 238 239 CMyPreviewView::~CMyPreviewView() 240 { 241 } 242 243 BEGIN_MESSAGE_MAP(CMyPreviewView, CPreviewView) 244 //{{AFX_MSG_MAP(CMyPreviewView) 245 ON_COMMAND(AFX_ID_PREVIEW_CLOSE, OnPreviewClose) 246 ON_COMMAND(AFX_ID_PREVIEW_PRINT, OnPreviewPrint) 247 // NOTE - the ClassWizard will add and remove mapping macros here. 248 //}}AFX_MSG_MAP 249 END_MESSAGE_MAP() 250 251 ///// 252 // CMyPreviewView drawing 253 254 void CMyPreviewView::OnDraw(CDC* pDC) 255 { 256 CPreviewView::OnDraw(pDC); 257 } 258 259 ///// 260 // CMyPreviewView diagnostics 261 262 #ifdef _DEBUG 263 void CMyPreviewView::AssertValid() const 264 { 265 266 } 267 268 void CMyPreviewView::Dump(CDumpContext& dc) const 269 { 270 } 271 #endif //_DEBUG 272 273 ///// 274 // CMyPreviewView message handlers 275 276 void CMyPreviewView::OnActivateView(BOOL bActivate, CView* pView1, CView *pView2) 277 { 278 CPreviewView::OnActivateView(bActivate, pView1, pView2); 279 } 280 281 void CMyPreviewView::OnPreviewClose() 282 { 283 CMainFrame* pf=(CMainFrame*)::AfxGetMainWnd(); 284 CWinApp *pApp=AfxGetApp(); 285 pApp->m_pMainWnd=pf->pOldWnd; 286 pf->DestroyWindow(); 287 } 288 289 void CMyPreviewView::OnEndPrintPreview(CDC* pDC, CPrintInfo* pInfo, POINT point, CPreviewView* pView) 290 { 291 292 CPreviewView::OnEndPrintPreview(pDC, pInfo, point, pView); 293 } 294 295 void CMyPreviewView::OnPreviewPrint() 296 { 297 m_pPrintView->SendMessage(WM_COMMAND, ID_FILE_PRINT); 298 OnPreviewClose(); // force close of Preview 299 }
3.在stdafx.h中添加函数指针定义
typedef void(*DRAWFUN)(CDC* pDC,CPrintInfo* pInfo,void* pVoid);
4.在对话框类中添加上述类的头文件。
5.在对话框中添加按钮消息响应函数
1 void C我的打印预览Dlg::OnBnClickedOk() 2 { 3 m_PreFrame = new CMainFrame(DRWAPRINTER,this,this,FALSE); 4 if (!m_PreFrame) return; 5 m_PreFrame->ShowWindow(SW_SHOW); 6 m_PreFrame->UpdateWindow(); 7 }
6.添加打印函数DRWAPRINTER定义，同时将其声明。
1 void DRWAPRINTER(CDC* pDC,CPrintInfo* pInfo,void* pVoid) 2 { 3 //((CImageboxUI*)pVoid)->OnPrint(pDC,pInfo); 4 }
7.将要绘制的内容写进DRWAPRINTER函数即可。
1 void C我的打印预览Dlg::OnPrint(CDC * pDC, CPrintInfo* pInfo) 2 { 3 CBrush ColorBrush(RGB(100, 100, 0));//设置颜色 4 pDC->SelectObject(&ColorBrush);//将色彩赋与刷子 5 pDC->Ellipse(0,0,1000,1000); 6 }
8.至此即可完成MFC对话框中打印预览的实现。
9.自己写了一个打印字符串的函数：
1 //打印字符串 2 void C我的打印预览Dlg::PrintString(CString str, CString mfont, int x, int y, int sz, CDC & dc) 3 { 4 CFont font; 5 6 VERIFY(font.CreatePointFont(sz, 7 8 mfont, 9 10 &dc));//为DC创建字体 11 12 CFont* def_font = dc.SelectObject(&font);//保存现在的字体 13 14 dc.SetTextAlign(TA_TOP|TA_LEFT); 15 16 CString s = str; //要打印的字符串（注意有长度的限制） 17 18 19 s += "\n"; //必须增加一个换行符号（因为后面while循环的要求） 20 21 CString ss; 22 23 int index; 24 25 CSize size; 26 27 size = dc.GetTextExtent("00", 2);//计算使用当前字体输出时文本所占大小、宽 度 28 29 while((index = s.Find("\n")) != -1) 30 31 { 32 33 ss = s.Left(index); 34 35 if(ss.Find("\r") != -1)//输入的字符串有回车符 36 37 ss = s.Left(index-1); 38 39 s = s.Mid(index+1);//取剩余的字符串 // AfxMessageBox("A"+ss+"A"); 40 41 dc.TextOut(x, y, ss);//打印到缓冲区 42 43 y -= size.cy; 44 45 } 46 47 48 dc.SelectObject(def_font); //恢复原来的字体 49 50 font.DeleteObject(); 51 }
这样就可以随心所欲地设置打印内容了。
感谢AWEN提供的巨大帮助！
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