二、Windows图形处理—设备内容(DEVCAPS1程序)

程序5-1 DEVCAPS1

        
DEVCAPS1.C
        
/*------------------------------------------------------------------------
        
  DEVCAPS1.C -- Device Capabilities Display Program No. 1
        
            (c) Charles Petzold, 1998
        
----------------------------------------------------------------------*/
        
#include <windows.h>
        
#define NUMLINES ((int) (sizeof devcaps / sizeof devcaps [0]))
        
struct
        
{
        
    int    iIndex ;
        
    TCHAR *szLabel ;
        
    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,
        
           PSTR szCmdLine, int iCmdShow)
        
{
        
    static TCHAR szAppName[] = TEXT ("DevCaps1") ;
        
    HWND          hwnd ;
        
    MSG           msg ;
        
    WNDCLASS      wndclass ;
        
   
        
    wndclass.style        = CS_HREDRAW | CS_VREDRAW ;
        
    wndclass.lpfnWndProc= WndProc ;
        
    wndclass.cbClsExtra   = 0 ;
        
    wndclass.cbWndExtra = 0 ;
        
    wndclass.hInstance    = hInstance ;
        
    wndclass.hIcon        = LoadIcon (NULL, IDI_APPLICATION) ;
        
    wndclass.hCursor      = LoadCursor (NULL, IDC_ARROW) ;
        
    wndclass.hbrBackground= (HBRUSH) GetStockObject (WHITE_BRUSH) ;
        
    wndclass.lpszMenuName= NULL ;
        
    wndclass.lpszClassName= szAppName ;
        
   
        
    if (!RegisterClass (&wndclass))
        
    {
        
            MessageBox (  NULL, TEXT ("This program requires Windows NT!"),
        
                                         szAppName, MB_ICONERROR) ;
        
            return 0 ;
        
    }
        
   
        
    hwnd = CreateWindow (szAppName, TEXT ("Device Capabilities"),
        
                                         WS_OVERLAPPEDWINDOW,
        
                                         CW_USEDEFAULT, CW_USEDEFAULT,
        
                                  CW_USEDEFAULT, CW_USEDEFAULT,
        
                          NULL, NULL, hInstance, NULL) ;
        
   
        
    ShowWindow (hwnd, iCmdShow) ;
        
    UpdateWindow (hwnd) ;
        
  
        
    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] ;
        
    HDC           hdc ;
        
    int           i ;
        
    PAINTSTRUCT   ps ;
        
    TEXTMETRIC    tm ;
        
   
        
    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) ;
        
            for (i = 0 ; i < NUMLINES ; i++)
        
            {
        
                   TextOut (     hdc, 0, cyChar * i,
        
                           devcaps[i].szLabel,
        
                           lstrlen (devcaps[i].szLabel)) ;
        
             
        
                   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) ;
        
}