输出windows系统信息-sdk

/*----------------------------------------------------
SYSMETS3.C -- System Metrics Display Program No. 3
(c) Charles Petzold, 1998
----------------------------------------------------*/

#define WINVER 0x0500
#include <windows.h>
#include "sysmets.h"

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

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
    static TCHAR szAppName[] = TEXT ("SysMets3") ;
    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 ("Program requires Windows NT!"),
            szAppName, MB_ICONERROR) ;
        return 0 ;
    }

    hwnd = CreateWindow (szAppName, TEXT ("Get System Metrics No. 3"),
        WS_OVERLAPPEDWINDOW | WS_VSCROLL | WS_HSCROLL,
        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, cxClient, cyClient, iMaxWidth ;
    HDC         hdc ;
    int         i, x, y, iVertPos, iHorzPos, iPaintBeg, iPaintEnd ;
    PAINTSTRUCT ps ;
    SCROLLINFO  si ;
    TCHAR       szBuffer[10] ;
    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) ;

        // Save the width of the three columns

        iMaxWidth = 40 * cxChar + 22 * cxCaps ;
        return 0 ;

    case WM_SIZE:
        cxClient = LOWORD (lParam) ;
        cyClient = HIWORD (lParam) ;

        // Set vertical scroll bar range and page size

        si.cbSize = sizeof (si) ;
        si.fMask  = SIF_RANGE | SIF_PAGE ;
        si.nMin   = 0 ;
        si.nMax   = NUMLINES - 1 ;
        si.nPage  = cyClient / cyChar ;
        SetScrollInfo (hwnd, SB_VERT, &si, TRUE) ;

        // Set horizontal scroll bar range and page size

        si.cbSize = sizeof (si) ;
        si.fMask  = SIF_RANGE | SIF_PAGE ;
        si.nMin   = 0 ;
        si.nMax   = 2 + iMaxWidth / cxChar ;
        si.nPage  = cxClient / cxChar ;
        SetScrollInfo (hwnd, SB_HORZ, &si, TRUE) ;
        return 0 ;

    case WM_VSCROLL:
        // Get all the vertial scroll bar information

        si.cbSize = sizeof (si) ;
        si.fMask  = SIF_ALL ;
        GetScrollInfo (hwnd, SB_VERT, &si) ;

        // Save the position for comparison later on

        iVertPos = si.nPos ;

        switch (LOWORD (wParam))
        {
        case SB_TOP:
            si.nPos = si.nMin ;
            break ;

        case SB_BOTTOM:
            si.nPos = si.nMax ;
            break ;

        case SB_LINEUP:
            si.nPos -= 1 ;
            break ;

        case SB_LINEDOWN:
            si.nPos += 1 ;
            break ;

        case SB_PAGEUP:
            si.nPos -= si.nPage ;
            break ;

        case SB_PAGEDOWN:
            si.nPos += si.nPage ;
            break ;

        case SB_THUMBTRACK:
            si.nPos = si.nTrackPos ;
            break ;

        default:
            break ;
        }
        // Set the position and then retrieve it.  Due to adjustments
        //   by Windows it may not be the same as the value set.

        si.fMask = SIF_POS ;
        SetScrollInfo (hwnd, SB_VERT, &si, TRUE) ;
        GetScrollInfo (hwnd, SB_VERT, &si) ;

        // If the position has changed, scroll the window and update it

        if (si.nPos != iVertPos)
        {
            ScrollWindow (hwnd, 0, cyChar * (iVertPos - si.nPos),
                NULL, NULL) ;
            UpdateWindow (hwnd) ;
        }
        return 0 ;

    case WM_HSCROLL:
        // Get all the vertial scroll bar information

        si.cbSize = sizeof (si) ;
        si.fMask  = SIF_ALL ;

        // Save the position for comparison later on

        GetScrollInfo (hwnd, SB_HORZ, &si) ;
        iHorzPos = si.nPos ;

        switch (LOWORD (wParam))
        {
        case SB_LINELEFT:
            si.nPos -= 1 ;
            break ;

        case SB_LINERIGHT:
            si.nPos += 1 ;
            break ;

        case SB_PAGELEFT:
            si.nPos -= si.nPage ;
            break ;

        case SB_PAGERIGHT:
            si.nPos += si.nPage ;
            break ;

        case SB_THUMBPOSITION:
            si.nPos = si.nTrackPos ;
            break ;

        default :
            break ;
        }
        // Set the position and then retrieve it.  Due to adjustments
        //   by Windows it may not be the same as the value set.

        si.fMask = SIF_POS ;
        SetScrollInfo (hwnd, SB_HORZ, &si, TRUE) ;
        GetScrollInfo (hwnd, SB_HORZ, &si) ;

        // If the position has changed, scroll the window

        if (si.nPos != iHorzPos)
        {
            ScrollWindow (hwnd, cxChar * (iHorzPos - si.nPos), 0,
                NULL, NULL) ;
        }
        return 0 ;

    case WM_PAINT :
        hdc = BeginPaint (hwnd, &ps) ;

        // Get vertical scroll bar position

        si.cbSize = sizeof (si) ;
        si.fMask  = SIF_POS ;
        GetScrollInfo (hwnd, SB_VERT, &si) ;
        iVertPos = si.nPos ;

        // Get horizontal scroll bar position

        GetScrollInfo (hwnd, SB_HORZ, &si) ;
        iHorzPos = si.nPos ;

        // Find painting limits

        iPaintBeg = max (0, iVertPos + ps.rcPaint.top / cyChar) ;
        iPaintEnd = min (NUMLINES - 1,
            iVertPos + ps.rcPaint.bottom / cyChar) ;

        for (i = iPaintBeg ; i <= iPaintEnd ; i++)
        {
            x = cxChar * (1 - iHorzPos) ;
            y = cyChar * (i - iVertPos) ;

            TextOut (hdc, x, y,
                sysmetrics[i].szLabel,
                lstrlen (sysmetrics[i].szLabel)) ;

            TextOut (hdc, x + 22 * cxCaps, y,
                sysmetrics[i].szDesc,
                lstrlen (sysmetrics[i].szDesc)) ;

            SetTextAlign (hdc, TA_RIGHT | TA_TOP) ;

            TextOut (hdc, x + 22 * cxCaps + 40 * cxChar, y, szBuffer,
                wsprintf (szBuffer, TEXT ("%5d"),
                GetSystemMetrics (sysmetrics[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) ;
}