> chapter 5 device.c

#include<windows.h>

		HDC hdc;
		TEXTMETRIC tm;
				PAINTSTRUCT	ps ;
						int i;

#define		NUMLINES (int )(sizeof(devcaps)/sizeof (devcaps[0]))
struct {
	int iIndex;
	TCHAR * szLable;
	TCHAR * szDesc;
} devcaps[]={
	HORZSIZE,	TEXT ("HORZSIZE"),TEXT ("Width in millimeters:"),
	VERTSIZE,	TEXT ("VERTSIZE"),TEXT ("Height in millimeters:"),
	HORZRES,	TEXT ("HORZRES"),	TEXT ("Width in pixels:"),
 	VERTRES, 	TEXT ("VERTRES"),	TEXT ("Height in raster lines:"),
	BITSPIXEL, 	TEXT ("BITSPIXEL"),TEXT ("Color bits per pixel:"),
	PLANES, 	TEXT ("PLANES"),   TEXT ("Number of color planes:"),
 	NUMBRUSHES,	TEXT ("NUMBRUSHES"),	TEXT ("Number of device brushes:"),
	NUMPENS,	TEXT ("NUMPENS"),  	TEXT ("Number of device pens:"),
 	NUMMARKERS,	TEXT ("NUMMARKERS"),	TEXT ("Number of device markers:"),
	NUMFONTS,	TEXT ("NUMFONTS"), 	TEXT ("Number of device fonts:"),
	NUMCOLORS,	TEXT ("NUMCOLORS"),	TEXT ("Number of device colors:"),
	PDEVICESIZE,	TEXT ("PDEVICESIZE"),	TEXT ("Size of device structure:"),
	ASPECTX, 	TEXT ("ASPECTX"), 	TEXT ("Relative width of pixel:"),
	ASPECTY, 	TEXT ("ASPECTY"),	TEXT ("Relative height of pixel:"),
	ASPECTXY,	TEXT ("ASPECTXY"),	TEXT ("Relative diagonal of pixel:"),
	LOGPIXELSX,	TEXT ("LOGPIXELSX"),	TEXT ("Horizontal dots per inch:"),
	LOGPIXELSY,	TEXT ("LOGPIXELSY"),	TEXT ("Vertical dots per inch:"),
	SIZEPALETTE,	TEXT ("SIZEPALETTE"),	TEXT ("Number of palette entries:"),
	NUMRESERVED,	TEXT ("NUMRESERVED"),	TEXT ("Reserved palette entries:"),
	COLORRES, 	TEXT ("COLORRES"), 	TEXT ("Actual color resolution:")
};

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

int	WINAPI WinMain(
	HINSTANCE hInstance, 
	HINSTANCE hPrevInstance, 
	LPWSTR lpCmdLine, 
	int iShowCmd 
	)
{
		HWND hwnd;
			MSG msg;
	static TCHAR szAppName[]=TEXT("Device");

	//design a window
	WNDCLASS wndcls;
	wndcls.cbClsExtra=0;
	wndcls.cbWndExtra=0;
	wndcls.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);

	wndcls.hCursor=LoadCursor(NULL,IDC_APPSTARTING);
	wndcls.hIcon=LoadIcon(NULL,IDI_APPLICATION);
	wndcls.hInstance=hInstance;
	wndcls.lpfnWndProc=WndProc;
	wndcls.lpszClassName=szAppName;
	wndcls.lpszMenuName=NULL;//?
	wndcls.style=CS_HREDRAW | CS_VREDRAW;

	//register a window
	RegisterClass(&wndcls);

	//creat a window

	hwnd=CreateWindow(
		szAppName,TEXT("DEVICE"),WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,
		CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInstance,NULL
		);

	//show and update
	ShowWindow(hwnd,iShowCmd);
	UpdateWindow(hwnd);

	//loop

	while(GetMessage(&msg,NULL,0,0)){
		TranslateMessage(& msg);
		DispatchMessage(&msg);
	}
	return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
	static int cxChar,cxCaps,cyChar;
	TCHAR szBuffer[10];

	switch(message){
	case WM_CREATE:


		hdc=GetDC(hwnd);
		GetTextMetrics (hdc, &tm) ;
		cxChar	= tm.tmAveCharWidth ;
		cxCaps	= (tm.tmPitchAndFamily & 1 ? 3 : 2) * cxChar / 2 ;
		cyChar	= tm.tmHeight + tm.tmExternalLeading ;

		ReleaseDC(hwnd,hdc);
		return 0;
	case WM_PAINT:

		hdc=BeginPaint(hwnd,&ps);

	//		TCHAR * szLable;
	//TCHAR * szDesc;
		for(i=0;i<NUMLINES;++i){
			TextOut(hdc,0,cyChar * i,devcaps[i].szLable,/
				lstrlen(devcaps[i].szLable));
			TextOut(hdc,14*cxCaps,cyChar * i,devcaps[i].szDesc,/
				lstrlen(devcaps[i].szDesc));
			SetTextAlign (hdc, TA_RIGHT | TA_TOP) ;
			TextOut (hdc, 14*cxCaps+35*cxChar, cyChar*i, szBuffer,
				wsprintf (szBuffer, TEXT ("%5d"),
			GetDeviceCaps (hdc, devcaps[i].iIndex))) ;
               
			SetTextAlign (hdc, TA_LEFT | TA_TOP) ;
		}
		EndPaint(hwnd,&ps);
		return 0;
	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;
	}
	return DefWindowProc(hwnd,message,wParam,lParam);
}