SYSMETS4.docx
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SYSMETS4
/*----------------------------------------------------
SYSMETS4.C--SystemMetricsDisplayProgramNo.4
（c）CharlesPetzold,1998
----------------------------------------------------*/
#defineWINVER0x0500
#include
#include"sysmets.h"
LRESULTCALLBACKWndProc（HWND,UINT,WPARAM,LPARAM）;
intWINAPIWinMain（HINSTANCEhInstance,HINSTANCEhPrevInstance,
PSTRszCmdLine,intiCmdShow）
{
staticTCHARszAppName[]=TEXT（"SysMets4"）;
HWNDhwnd;
MSGmsg;
WNDCLASSwndclass;
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（"ProgramrequiresWindowsNT!
"）,
szAppName,MB_ICONERROR）;
return0;
}
hwnd=CreateWindow（szAppName,TEXT（"GetSystemMetricsNo.4"）,
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）;
}
returnmsg.wParam;
}
LRESULTCALLBACKWndProc（HWNDhwnd,UINTmessage,WPARAMwParam,LPARAMlParam）
{
staticintcxChar,cxCaps,cyChar,cxClient,cyClient,iMaxWidth;
HDChdc;
inti,x,y,iVertPos,iHorzPos,iPaintBeg,iPaintEnd;
PAINTSTRUCTps;
SCROLLINFOsi;
TCHARszBuffer[10];
TEXTMETRICtm;
switch（message）
{
caseWM_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）;
//Savethewidthofthethreecolumns
iMaxWidth=40*cxChar+22*cxCaps;
return0;
caseWM_SIZE:
cxClient=LOWORD（lParam）;
cyClient=HIWORD（lParam）;
//Setverticalscrollbarrangeandpagesize
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）;
//Sethorizontalscrollbarrangeandpagesize
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）;
return0;
caseWM_VSCROLL:
//Getalltheverticalscrollbarinformation
si.cbSize=sizeof（si）;
si.fMask=SIF_ALL;
GetScrollInfo（hwnd,SB_VERT,&si）;
//Savethepositionforcomparisonlateron
iVertPos=si.nPos;
switch（LOWORD（wParam））
{
caseSB_TOP:
si.nPos=si.nMin;
break;
caseSB_BOTTOM:
si.nPos=si.nMax;
break;
caseSB_LINEUP:
si.nPos-=1;
break;
caseSB_LINEDOWN:
si.nPos+=1;
break;
caseSB_PAGEUP:
si.nPos-=si.nPage;
break;
caseSB_PAGEDOWN:
si.nPos+=si.nPage;
break;
caseSB_THUMBTRACK:
si.nPos=si.nTrackPos;
break;
default:
break;
}
//Setthepositionandthenretrieveit.Duetoadjustments
//byWindowsitmightnotbethesameasthevalueset.
si.fMask=SIF_POS;
SetScrollInfo（hwnd,SB_VERT,&si,TRUE）;
GetScrollInfo（hwnd,SB_VERT,&si）;
//Ifthepositionhaschanged,scrollthewindowandupdateit
if（si.nPos!
=iVertPos）
{
ScrollWindow（hwnd,0,cyChar*（iVertPos-si.nPos）,
NULL,NULL）;
UpdateWindow（hwnd）;
}
return0;
caseWM_HSCROLL:
//Getalltheverticalscrollbarinformation
si.cbSize=sizeof（si）;
si.fMask=SIF_ALL;
//Savethepositionforcomparisonlateron
GetScrollInfo（hwnd,SB_HORZ,&si）;
iHorzPos=si.nPos;
switch（LOWORD（wParam））
{
caseSB_LINELEFT:
si.nPos-=1;
break;
caseSB_LINERIGHT:
si.nPos+=1;
break;
caseSB_PAGELEFT:
si.nPos-=si.nPage;
break;
caseSB_PAGERIGHT:
si.nPos+=si.nPage;
break;
caseSB_THUMBPOSITION:
si.nPos=si.nTrackPos;
break;
default:
break;
}
//Setthepositionandthenretrieveit.Duetoadjustments
//byWindowsitmightnotbethesameasthevalueset.
si.fMask=SIF_POS;
SetScrollInfo（hwnd,SB_HORZ,&si,TRUE）;
GetScrollInfo（hwnd,SB_HORZ,&si）;
//Ifthepositionhaschanged,scrollthewindow
if（si.nPos!
=iHorzPos）
{
ScrollWindow（hwnd,cxChar*（iHorzPos-si.nPos）,0,
NULL,NULL）;
}
return0;
caseWM_KEYDOWN:
switch（wParam）
{
caseVK_HOME:
SendMessage（hwnd,WM_VSCROLL,SB_TOP,0）;
break;
caseVK_END:
SendMessage（hwnd,WM_VSCROLL,SB_BOTTOM,0）;
break;
caseVK_PRIOR:
SendMessage（hwnd,WM_VSCROLL,SB_PAGEUP,0）;
break;
caseVK_NEXT:
SendMessage（hwnd,WM_VSCROLL,SB_PAGEDOWN,0）;
break;
caseVK_UP:
SendMessage（hwnd,WM_VSCROLL,SB_LINEUP,0）;
break;
caseVK_DOWN:
SendMessage（hwnd,WM_VSCROLL,SB_LINEDOWN,0）;
break;
caseVK_LEFT:
SendMessage（hwnd,WM_HSCROLL,SB_PAGEUP,0）;
break;
caseVK_RIGHT:
SendMessage（hwnd,WM_HSCROLL,SB_PAGEDOWN,0）;
break;
}
return0;
caseWM_PAINT:
hdc=BeginPaint（hwnd,&ps）;
//Getverticalscrollbarposition
si.cbSize=sizeof（si）;
si.fMask=SIF_POS;
GetScrollInfo（hwnd,SB_VERT,&si）;
iVertPos=si.nPos;
//Gethorizontalscrollbarposition
GetScrollInfo（hwnd,SB_HORZ,&si）;
iHorzPos=si.nPos;
//Findpaintinglimits
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）;
return0;
caseWM_DESTROY:
PostQuitMessage（0）;
return0;
}
returnDefWindowProc（hwnd,message,wParam,lParam）;
}
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