screendlg.cpp

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// screenDlg.cpp : implementation file
//

#include "stdafx.h"
#include "screen.h"
#include "screenDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CScreenDlg dialog

CScreenDlg::CScreenDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CScreenDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CScreenDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CScreenDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CScreenDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CScreenDlg, CDialog)
	//{{AFX_MSG_MAP(CScreenDlg)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CScreenDlg message handlers




void OnScreenSave(const char *filename)
{
	HDC  hScrDC, hMemDC;         
    int  width, height; 
	
	//the pointer will save all pixel point's color value
	BYTE  *lpBitmapBits = NULL; 
	
	//creates a device context for the screen device 
    hScrDC = CreateDC(_T("DISPLAY"), NULL, NULL, NULL);
	
	//get the screen point size
    width = GetDeviceCaps(hScrDC, HORZRES);
    height = GetDeviceCaps(hScrDC, VERTRES);
	
    //creates a memory device context (DC) compatible with the screen device(hScrDC)  
    hMemDC = CreateCompatibleDC(hScrDC);
	
	//initialise the struct BITMAPINFO for the bimap infomation，
	//in order to use the function CreateDIBSection
	//on wince os, each pixel stored by 24 bits(biBitCount=24) 
	//and no compressing(biCompression=0)
    BITMAPINFO RGB24BitsBITMAPINFO; 
    ZeroMemory(&RGB24BitsBITMAPINFO, sizeof(BITMAPINFO));
    RGB24BitsBITMAPINFO.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    RGB24BitsBITMAPINFO.bmiHeader.biWidth = width;
    RGB24BitsBITMAPINFO.bmiHeader.biHeight = height;
    RGB24BitsBITMAPINFO.bmiHeader.biPlanes = 1;
    RGB24BitsBITMAPINFO.bmiHeader.biBitCount = 24;
	
	//use the function CreateDIBSection and SelectObject 
	//in order to get the bimap pointer : lpBitmapBits
    HBITMAP directBmp = CreateDIBSection(hMemDC, (BITMAPINFO*)&RGB24BitsBITMAPINFO, 
		DIB_RGB_COLORS, (void **)&lpBitmapBits, NULL, 0);
	HGDIOBJ previousObject = SelectObject(hMemDC, directBmp);
	
	// copy the screen dc to the memory dc
	BitBlt(hMemDC, 0, 0, width, height, hScrDC, 0, 0, SRCCOPY);
	
	//if you only want to get the every pixel color value, 
	//you can begin here and the following part of this function will be unuseful;
	//the following part is in order to write file;
	
	//bimap file header in order to write bmp file
	BITMAPFILEHEADER bmBITMAPFILEHEADER;
	ZeroMemory(&bmBITMAPFILEHEADER, sizeof(BITMAPFILEHEADER));
	bmBITMAPFILEHEADER.bfType = 0x4d42;  //bmp  
    bmBITMAPFILEHEADER.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
    bmBITMAPFILEHEADER.bfSize = bmBITMAPFILEHEADER.bfOffBits + ((width*height)*3); ///3=(24 / 8)
	
	//write into file 
	FILE *mStream = NULL;
	if((mStream = fopen(filename, "wb")))
	{  
		//write bitmap file header
		fwrite(&bmBITMAPFILEHEADER, sizeof(BITMAPFILEHEADER), 1, mStream);
		//write bitmap info 
		fwrite(&(RGB24BitsBITMAPINFO.bmiHeader), sizeof(BITMAPINFOHEADER), 1, mStream);
		//write bitmap pixels data
		fwrite(lpBitmapBits, 3*width*height, 1, mStream);
		//close file
		fclose(mStream);
	}
	
	//delete
	DeleteObject(hMemDC);
	DeleteObject(hScrDC);
	DeleteObject(directBmp);
	DeleteObject(previousObject);
	
}







BOOL CScreenDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	CenterWindow(GetDesktopWindow());	// center to the hpc screen

	// TODO: Add extra initialization here
	OnScreenSave("MyScreen.bmp");
	return TRUE;  // return TRUE  unless you set the focus to a control
}