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Magnum One
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Magnum One (Mid-American Digital) (Disc Manufacturing).iso
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pmfremem.arc
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FREEMEM.C
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C/C++ Source or Header
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1990-08-08
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3KB
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132 lines
/*
-----------------------------------
FREEMEM.c - Free memory display
-----------------------------------
From Programming the OS/2 Presentation Manager
by Charles Petzold
*/
#define INCL_WIN
#define INCL_GPI
#define INCL_DOS
#include <os2.h>
#include <string.h>
#define ID_TIMER 1
MRESULT EXPENTRY ClientWndProc (HWND, USHORT, MPARAM, MPARAM) ;
VOID SizeTheWindow (HWND) ;
int main (void)
{
static CHAR szClientClass[] = "FreeMem" ;
static ULONG flFrameFlags = FCF_TITLEBAR | FCF_SYSMENU |
FCF_BORDER | FCF_TASKLIST ;
HAB hab;
HMQ hmq;
HWND hwndFrame, hwndClient ;
QMSG qmsg;
hab=WinInitialize (0) ;
hmq = WinCreateMsgQueue (hab, 0) ;
WinRegisterClass (hab, szClientClass, ClientWndProc, 0L, 0 ) ;
hwndFrame = WinCreateStdWindow (HWND_DESKTOP, WS_VISIBLE,
&flFrameFlags, szClientClass, NULL,
0L, NULL, 0, &hwndClient ) ;
SizeTheWindow (hwndFrame) ;
if (WinStartTimer (hab, hwndClient, ID_TIMER, 1000)) {
while (WinGetMsg (hab, &qmsg, NULL, 0,0))
WinDispatchMsg (hab, &qmsg) ;
WinStopTimer (hab, hwndClient, ID_TIMER) ;
} else
WinMessageBox (HWND_DESKTOP, hwndClient,
"Too many clocks or timers",
szClientClass, 0, MB_OK | MB_ICONEXCLAMATION) ;
WinDestroyWindow (hwndFrame) ;
WinDestroyMsgQueue (hmq) ;
WinTerminate (hab) ;
return 0;
}
VOID SizeTheWindow (HWND hwndFrame)
{
static CHAR szText [] = "1,234,567,890 bytes" ;
HPS hps;
POINTL aptl[TXTBOX_COUNT];
RECTL rcl;
hps = WinGetPS (hwndFrame) ;
GpiQueryTextBox (hps, sizeof szText - 1L, szText, TXTBOX_COUNT,aptl) ;
WinReleasePS (hps) ;
rcl.yBottom = 0 ;
rcl.yTop = 3 * (aptl[TXTBOX_TOPLEFT].y -
aptl[TXTBOX_BOTTOMLEFT].y) / 2 ;
rcl.xLeft = 0 ;
rcl.xRight = (sizeof szText + 1L) * (aptl[TXTBOX_BOTTOMRIGHT].x -
aptl[TXTBOX_BOTTOMLEFT].x) / (sizeof szText - 1L) ;
WinCalcFrameRect (hwndFrame, &rcl, FALSE) ;
WinSetWindowPos (hwndFrame, NULL, (SHORT) rcl.xLeft, (SHORT) rcl.yBottom,
(SHORT) (rcl.xRight - rcl.xLeft),
(SHORT) (rcl.yTop - rcl.yBottom), SWP_SIZE | SWP_MOVE) ;
}
VOID FormatNumber (CHAR *pchResult, ULONG ulValue)
{
BOOL fDisplay = FALSE;
SHORT sDigit;
ULONG ulQuotient, ulDivisor = 1000000000L ;
for (sDigit = 0 ; sDigit < 10 ; sDigit++) {
ulQuotient = ulValue / ulDivisor;
if (fDisplay || ulQuotient > 0 || sDigit == 9) {
fDisplay = TRUE;
*pchResult++ = (CHAR) ('0' + ulQuotient) ;
if ((sDigit % 3 == 0) && sDigit != 9)
*pchResult++ = ',' ;
}
ulValue -= ulQuotient * ulDivisor ;
ulDivisor /= 10;
}
*pchResult = '\0' ;
}
MRESULT EXPENTRY ClientWndProc (HWND hwnd, USHORT msg, MPARAM mp1, MPARAM mp2)
{
static RECTL rcl;
static ULONG ulFreeMem, ulPrevMem ;
CHAR szBuffer [24] ;
HPS hps ;
switch (msg) {
case WM_SIZE:
WinQueryWindowRect (hwnd, &rcl) ;
return 0;
case WM_TIMER:
DosMemAvail (&ulFreeMem) ;
if (ulFreeMem != ulPrevMem) {
WinInvalidateRect (hwnd, NULL, FALSE) ;
ulPrevMem = ulFreeMem;
}
return 0;
case WM_PAINT:
hps = WinBeginPaint (hwnd, NULL, NULL) ;
FormatNumber (szBuffer, ulFreeMem) ;
strcat (szBuffer, " bytes") ;
WinDrawText (hps, -1, szBuffer, &rcl,
CLR_NEUTRAL, CLR_BACKGROUND,
DT_CENTER | DT_VCENTER | DT_ERASERECT) ;
WinEndPaint (hps) ;
return 0;
}
return WinDefWindowProc (hwnd, msg, mp1, mp2) ;
}