【windows程序设计】系列04:文本输出

#define NUMLINES ((int) (sizeof sysmetrics / sizeof sysmetrics [0]))

struct
{
int     iIndex ;
TCHAR * szLabel ;
TCHAR * szDesc ;
}
sysmetrics [] =
{
SM_CXSCREEN,             TEXT ("SM_CXSCREEN"),
TEXT ("Screen width in pixels"),
SM_CYSCREEN,             TEXT ("SM_CYSCREEN"),
TEXT ("Screen height in pixels"),
SM_CXVSCROLL,            TEXT ("SM_CXVSCROLL"),
TEXT ("Vertical scroll width"),
SM_CYHSCROLL,            TEXT ("SM_CYHSCROLL"),
TEXT ("Horizontal scroll height"),
SM_CYCAPTION,            TEXT ("SM_CYCAPTION"),
TEXT ("Caption bar height"),
SM_CXBORDER,             TEXT ("SM_CXBORDER"),
TEXT ("Window border width"),
SM_CYBORDER,             TEXT ("SM_CYBORDER"),
TEXT ("Window border height"),
SM_CXFIXEDFRAME,         TEXT ("SM_CXFIXEDFRAME"),
TEXT ("Dialog window frame width"),
SM_CYFIXEDFRAME,         TEXT ("SM_CYFIXEDFRAME"),
TEXT ("Dialog window frame height"),
SM_CYVTHUMB,             TEXT ("SM_CYVTHUMB"),
TEXT ("Vertical scroll thumb height"),
SM_CXHTHUMB,             TEXT ("SM_CXHTHUMB"),
TEXT ("Horizontal scroll thumb width"),
SM_CXICON,               TEXT ("SM_CXICON"),
TEXT ("Icon width"),
SM_CYICON,               TEXT ("SM_CYICON"),
TEXT ("Icon height"),
SM_CXCURSOR,             TEXT ("SM_CXCURSOR"),
TEXT ("Cursor width"),
SM_CYCURSOR,             TEXT ("SM_CYCURSOR"),
TEXT ("Cursor height"),
SM_CYMENU,               TEXT ("SM_CYMENU"),
TEXT ("Menu bar height"),
SM_CXFULLSCREEN,         TEXT ("SM_CXFULLSCREEN"),
TEXT ("Full screen client area width"),
SM_CYFULLSCREEN,         TEXT ("SM_CYFULLSCREEN"),
TEXT ("Full screen client area height"),
SM_CYKANJIWINDOW,        TEXT ("SM_CYKANJIWINDOW"),
TEXT ("Kanji window height"),
SM_MOUSEPRESENT,         TEXT ("SM_MOUSEPRESENT"),
TEXT ("Mouse present flag"),
SM_CYVSCROLL,            TEXT ("SM_CYVSCROLL"),
TEXT ("Vertical scroll arrow height"),
SM_CXHSCROLL,            TEXT ("SM_CXHSCROLL"),
TEXT ("Horizontal scroll arrow width"),
SM_DEBUG,                TEXT ("SM_DEBUG"),
TEXT ("Debug version flag"),
SM_SWAPBUTTON,           TEXT ("SM_SWAPBUTTON"),
TEXT ("Mouse buttons swapped flag"),
SM_CXMIN,                TEXT ("SM_CXMIN"),
TEXT ("Minimum window width"),
SM_CYMIN,                TEXT ("SM_CYMIN"),
TEXT ("Minimum window height"),
SM_CXSIZE,               TEXT ("SM_CXSIZE"),
TEXT ("Min/Max/Close button width"),
SM_CYSIZE,               TEXT ("SM_CYSIZE"),
TEXT ("Min/Max/Close button height"),
SM_CXSIZEFRAME,          TEXT ("SM_CXSIZEFRAME"),
TEXT ("Window sizing frame width"),
SM_CYSIZEFRAME,          TEXT ("SM_CYSIZEFRAME"),
TEXT ("Window sizing frame height"),
SM_CXMINTRACK,           TEXT ("SM_CXMINTRACK"),
TEXT ("Minimum window tracking width"),
SM_CYMINTRACK,           TEXT ("SM_CYMINTRACK"),
TEXT ("Minimum window tracking height"),
SM_CXDOUBLECLK,          TEXT ("SM_CXDOUBLECLK"),
TEXT ("Double click x tolerance"),
SM_CYDOUBLECLK,          TEXT ("SM_CYDOUBLECLK"),
TEXT ("Double click y tolerance"),
SM_CXICONSPACING,        TEXT ("SM_CXICONSPACING"),
TEXT ("Horizontal icon spacing"),
SM_CYICONSPACING,        TEXT ("SM_CYICONSPACING"),
TEXT ("Vertical icon spacing"),
SM_MENUDROPALIGNMENT,    TEXT ("SM_MENUDROPALIGNMENT"),
TEXT ("Left or right menu drop"),
SM_PENWINDOWS,           TEXT ("SM_PENWINDOWS"),
TEXT ("Pen extensions installed"),
SM_DBCSENABLED,          TEXT ("SM_DBCSENABLED"),
TEXT ("Double-Byte Char Set enabled"),
SM_CMOUSEBUTTONS,        TEXT ("SM_CMOUSEBUTTONS"),
TEXT ("Number of mouse buttons"),
SM_SECURE,               TEXT ("SM_SECURE"),
TEXT ("Security present flag"),
SM_CXEDGE,               TEXT ("SM_CXEDGE"),
TEXT ("3-D border width"),
SM_CYEDGE,               TEXT ("SM_CYEDGE"),
TEXT ("3-D border height"),
SM_CXMINSPACING,         TEXT ("SM_CXMINSPACING"),
TEXT ("Minimized window spacing width"),
SM_CYMINSPACING,         TEXT ("SM_CYMINSPACING"),
TEXT ("Minimized window spacing height"),
SM_CXSMICON,             TEXT ("SM_CXSMICON"),
TEXT ("Small icon width"),
SM_CYSMICON,             TEXT ("SM_CYSMICON"),
TEXT ("Small icon height"),
SM_CYSMCAPTION,          TEXT ("SM_CYSMCAPTION"),
TEXT ("Small caption height"),
SM_CXSMSIZE,             TEXT ("SM_CXSMSIZE"),
TEXT ("Small caption button width"),
SM_CYSMSIZE,             TEXT ("SM_CYSMSIZE"),
TEXT ("Small caption button height"),
SM_CXMENUSIZE,           TEXT ("SM_CXMENUSIZE"),
TEXT ("Menu bar button width"),
SM_CYMENUSIZE,           TEXT ("SM_CYMENUSIZE"),
TEXT ("Menu bar button height"),
SM_ARRANGE,              TEXT ("SM_ARRANGE"),
TEXT ("How minimized windows arranged"),
SM_CXMINIMIZED,          TEXT ("SM_CXMINIMIZED"),
TEXT ("Minimized window width"),
SM_CYMINIMIZED,          TEXT ("SM_CYMINIMIZED"),
TEXT ("Minimized window height"),
SM_CXMAXTRACK,           TEXT ("SM_CXMAXTRACK"),
TEXT ("Maximum dragable width"),
SM_CYMAXTRACK,           TEXT ("SM_CYMAXTRACK"),
TEXT ("Maximum dragable height"),
SM_CXMAXIMIZED,          TEXT ("SM_CXMAXIMIZED"),
TEXT ("Width of maximized window"),
SM_CYMAXIMIZED,          TEXT ("SM_CYMAXIMIZED"),
TEXT ("Height of maximized window"),
SM_NETWORK,              TEXT ("SM_NETWORK"),
TEXT ("Network present flag"),
SM_CLEANBOOT,            TEXT ("SM_CLEANBOOT"),
TEXT ("How system was booted"),
SM_CXDRAG,               TEXT ("SM_CXDRAG"),
TEXT ("Avoid drag x tolerance"),
SM_CYDRAG,               TEXT ("SM_CYDRAG"),
TEXT ("Avoid drag y tolerance"),
SM_SHOWSOUNDS,           TEXT ("SM_SHOWSOUNDS"),
TEXT ("Present sounds visually"),
SM_CXMENUCHECK,          TEXT ("SM_CXMENUCHECK"),
TEXT ("Menu check-mark width"),
SM_CYMENUCHECK,          TEXT ("SM_CYMENUCHECK"),
TEXT ("Menu check-mark height"),
SM_SLOWMACHINE,          TEXT ("SM_SLOWMACHINE"),
TEXT ("Slow processor flag"),
SM_MIDEASTENABLED,       TEXT ("SM_MIDEASTENABLED"),
TEXT ("Hebrew and Arabic enabled flag"),
SM_MOUSEWHEELPRESENT,    TEXT ("SM_MOUSEWHEELPRESENT"),
TEXT ("Mouse wheel present flag"),
SM_XVIRTUALSCREEN,       TEXT ("SM_XVIRTUALSCREEN"),
TEXT ("Virtual screen x origin"),
SM_YVIRTUALSCREEN,       TEXT ("SM_YVIRTUALSCREEN"),
TEXT ("Virtual screen y origin"),
SM_CXVIRTUALSCREEN,      TEXT ("SM_CXVIRTUALSCREEN"),
TEXT ("Virtual screen width"),
SM_CYVIRTUALSCREEN,      TEXT ("SM_CYVIRTUALSCREEN"),
TEXT ("Virtual screen height"),
SM_CMONITORS,            TEXT ("SM_CMONITORS"),
TEXT ("Number of monitors"),
SM_SAMEDISPLAYFORMAT,    TEXT ("SM_SAMEDISPLAYFORMAT"),
TEXT ("Same color format flag")
} ;

#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 ;//tmPitchAndFamily是否为变宽字体
cyChar = tm.tmHeight + tm.tmExternalLeading ;//tmExternalLeading为行距

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) ;
}