Step by step guide

It is very easy to build your own print preview with this this library! Below is the minimal set of steps you need to do:

• Init the library with the bvInit function call. Usually it is made in the InitInstance() function of your application
• Work - here the easiest way to create a preview window is to write your own class derived from CorePreviewCallbackWrapper. Below is an example of such class:

  #ifndef PREVIEW_H_INCLUDED
  #define PREVIEW_H_INCLUDED
  
  #include "BestView.h"
  
  class CPreview : public  BESTVIEW::CCorepreviewCallbackWrapper
  	{
  	public :
  	CPreview();
  	void CcwDrawPage(HDC ,DWORD ,BOOL );
  	};
  
  #endif  // PREVIEW_H_INCLUDED 			
  	

  And Preview.cpp file:

  	
  #include "Preview.h"
  #include <atlstr.h>
  
  CPreview::CPreview()
  	{
  	SetNumPages(3); // three pages 
  	
  	// set width as the default scale factor 
  	SetInitialPreviewMode(BESTVIEW::PREVIEW_MODE_WIDTH); 
  	
  	ZeroMemory(&CorePreviewPageSize,sizeof(CorePreviewPageSize)); 
  	CorePreviewPageSize.dwSize=sizeof(CorePreviewPageSize);
  	
  	// let the page be A4 format, i.e. 210x297 mm with 10 mm margins 
  	CorePreviewPageSize.dwPageWidth=21000;
  	CorePreviewPageSize.dwPageHeight=29700;
  	CorePreviewPageSize.dwLeftOffset=1000;
  	CorePreviewPageSize.dwTopOffset=1000;
  	CorePreviewPageSize.dwWidth=19000;
  	CorePreviewPageSize.dwHeight=27700;
  	}
  
  void CPreview::CcwDrawPage(HDC  dc,DWORD  Page,BOOL )
  	{
  	if(Page==0) // first page
  		{
  		HPEN  hPen =CreatePen(PS_SOLID,1,RGB(0,0,255));
  		HPEN  hOldPen=(HPEN)SelectObject(dc,hPen);
  		DWORD xOffset(0);  
  		for(;xOffset<=CorePreviewPageSize.dwWidth;xOffset+=1000)
  			{
  			MoveToEx(dc,xOffset,0,0);
  			LineTo(dc,xOffset,CorePreviewPageSize.dwHeight);
  			}
  		SelectObject(dc,hOldPen);
  		DeleteObject(hPen);
  		}
  		
  	if(Page==1) // second page
  		{
  		...
  		}
  
  	if(Page==2) // third page
  		{
  		...
  		}		
  			
  	}			
  		

  and in your command handler we will create a frame preview window:

  void CElementaryDlg::OnBnClickedCreatePreview()
  	{
  	CPreview * pPreview;
  	pPreview=new CPreview();
  	pPreview->CreatePreview(GetSafeHwnd(),_T("my first preview window"));
  	}	
  	

  For details please get a look at corresponding examples.

• At the end of work the application has to call the bvTerm function to clean up all internal resources that have been allocated by the library