实现画图板

// WriteDIB - Writes a DIB to file

// Returns - TRUE on success

// szFile - Name of file to write to

// hDIB - Handle of the DIB

BOOL WriteDIB( LPTSTR szFile, HANDLE hDIB)

{

BITMAPFILEHEADER hdr;

lpbi = (LPBITMAPINFOHEADER)hDIB;

int nColors = 1 << lpbi->biBitCount;

// Fill in the fields of the file header

hdr.bfType = ((WORD) ('M' << 8) | 'B'); // is always "BM"

hdr.bfSize=GlobalSize (hDIB) + sizeof( hdr );

hdr.bfReserved1 = 0;

hdr.bfReserved2 = 0;

hdr.bfOffBits = (DWORD)(sizeof( hdr ) + lpbi->biSize +

nColors * sizeof(RGBQUAD));

// Write the file header

// Demo1.cpp : Defines the class behaviors for the application.

//

#include "stdafx.h"

#include "Demo1.h"

#include "MainFrm.h"

#include "Demo1View.h"

#define new DEBUG_NEW

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

// CDemo1App

BEGIN_MESSAGE_MAP(CDemo1App, CWinApp)

//{{AFX_MSG_MAP(CDemo1App)

ON_COMMAND(ID_APP_ABOUT, OnAppAbout)

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

// DO NOT EDIT what you see in these blocks of generated code!

//}}AFX_MSG_MAP

// Standard file based document commands

ON_COMMAND(ID_FILE_NEW, CWinApp::OnFileNew)

ON_COMMAND(ID_FILE_OPEN, CWinApp::OnFileOpen)

// Standard print setup command

END_MESSAGE_MAP()

// CDemo1App construction

{

// TODO: add construction code here,

// Place all significant initialization in InitInstance

BOOL CDemo1App::InitInstance()

{

AfxEnableControlContainer();

// Standard initialization

// If you are not using these features and wish to reduce the size

// of your final executable, you should remove from the following

// the specific initialization routines you do not need.

#ifdef _AFXDLL

Enable3dControls(); // Call this when using MFC in a shared DLL

#else

LoadStdProfileSettings(); // Load standard INI file options (including MRU)

// Register the application's document templates. Document templates

// serve as the connection between documents, frame windows and views.

CSingleDocTemplate* pDocTemplate;

pDocTemplate = new CSingleDocTemplate(

IDR_MAINFRAME,

RUNTIME_CLASS(CDemo1Doc),

RUNTIME_CLASS(CMainFrame), // main SDI frame window

RUNTIME_CLASS(CDemo1View));

AddDocTemplate(pDocTemplate);

m_pMainWnd->UpdateWindow();

return TRUE;

}

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

// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog

{

public:

// Dialog Data

// ClassWizard generated virtual function overrides

//{{AFX_VIRTUAL(CAboutDlg)

protected:

virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support

//}}AFX_VIRTUAL

// Implementation

protected:

//{{AFX_MSG(CAboutDlg)

// No message handlers

//}}AFX_MSG

DECLARE_MESSAGE_MAP()

};

//}}AFX_DATA_MAP

}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)

//{{AFX_MSG_MAP(CAboutDlg)

// No message handlers

//}}AFX_MSG_MAP

END_MESSAGE_MAP()

// App command to run the dialog

void CDemo1App::OnAppAbout()

{

}