#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 ("SysMets2" ) ;
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 ("Get System Metrics No. 2" ),
WS_OVERLAPPEDWINDOW | WS_VSCROLL ,
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 , cyClient , iVscrollPos ;
HDC hdc ;
int i, y ;
PAINTSTRUCT ps ;
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 ) ;
SetScrollRange (hwnd, SB_VERT, 0, NUMLINES - 1, FALSE ) ;
SetScrollPos (hwnd, SB_VERT, iVscrollPos , TRUE) ;
return 0 ;
case WM_SIZE:
cyClient = HIWORD (lParam ) ;
return 0 ;
case WM_VSCROLL:
switch ( LOWORD (wParam ))
{
case SB_LINEUP:
iVscrollPos -= 1 ;
break ;
case SB_LINEDOWN :
iVscrollPos += 1 ;
break ;
case SB_PAGEUP:
iVscrollPos -= cyClient / cyChar ;
break ;
case SB_PAGEDOWN :
iVscrollPos += cyClient / cyChar ;
break ;
case SB_THUMBPOSITION :
iVscrollPos = HIWORD (wParam ) ;
break ;
default :
break ;
}
iVscrollPos = max (0, min (iVscrollPos , NUMLINES - 1)) ;
if (iVscrollPos != GetScrollPos (hwnd, SB_VERT))
{
SetScrollPos (hwnd, SB_VERT, iVscrollPos , TRUE) ;
InvalidateRect (hwnd, NULL, TRUE) ;
UpdateWindow(hwnd);
}
return 0 ;
case WM_PAINT :
hdc = BeginPaint (hwnd, & ps) ;
for ( i = 0 ; i < NUMLINES ; i++)
{
y = cyChar * (i - iVscrollPos ) ;
TextOut (hdc , 0, y,
sysmetrics[ i].szLabel,
lstrlen (sysmetrics[ i].szLabel)) ;
TextOut (hdc , 22 * cxCaps, y,
sysmetrics[ i].szDesc ,
lstrlen (sysmetrics[ i].szDesc )) ;
SetTextAlign (hdc , TA_RIGHT | TA_TOP ) ;
TextOut (hdc , 22 * cxCaps + 40 * cxChar, y, szBuffer ,
wsprintf (szBuffer , TEXT ("%5d" ),
GetSystemMetrics (sysmetrics[ i].Index))) ;
SetTextAlign (hdc , TA_LEFT | TA_TOP ) ;
}
EndPaint (hwnd, & ps) ;
return 0 ;
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam , lParam ) ;
}
#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 ("SysMets2" ) ;
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 ("Get System Metrics No. 2" ),
WS_OVERLAPPEDWINDOW | WS_VSCROLL ,
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 , cyClient , iVscrollPos ;
HDC hdc ;
int i, y ;
PAINTSTRUCT ps ;
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 ) ;
SetScrollRange (hwnd, SB_VERT, 0, NUMLINES - 1, FALSE ) ;
SetScrollPos (hwnd, SB_VERT, iVscrollPos , TRUE) ;
return 0 ;
case WM_SIZE:
cyClient = HIWORD (lParam ) ;
return 0 ;
case WM_VSCROLL:
switch ( LOWORD (wParam ))
{
case SB_LINEUP:
iVscrollPos -= 1 ;
break ;
case SB_LINEDOWN :
iVscrollPos += 1 ;
break ;
case SB_PAGEUP:
iVscrollPos -= cyClient / cyChar ;
break ;
case SB_PAGEDOWN :
iVscrollPos += cyClient / cyChar ;
break ;
case SB_THUMBPOSITION :
iVscrollPos = HIWORD (wParam ) ;
break ;
default :
break ;
}
iVscrollPos = max (0, min (iVscrollPos , NUMLINES - 1)) ;
if (iVscrollPos != GetScrollPos (hwnd, SB_VERT))
{
SetScrollPos (hwnd, SB_VERT, iVscrollPos , TRUE) ;
InvalidateRect (hwnd, NULL, TRUE) ;
UpdateWindow(hwnd);
}
return 0 ;
case WM_PAINT :
hdc = BeginPaint (hwnd, & ps) ;
for ( i = 0 ; i < NUMLINES ; i++)
{
y = cyChar * (i - iVscrollPos ) ;
TextOut (hdc , 0, y,
sysmetrics[ i].szLabel,
lstrlen (sysmetrics[ i].szLabel)) ;
TextOut (hdc , 22 * cxCaps, y,
sysmetrics[ i].szDesc ,
lstrlen (sysmetrics[ i].szDesc )) ;
SetTextAlign (hdc , TA_RIGHT | TA_TOP ) ;
TextOut (hdc , 22 * cxCaps + 40 * cxChar, y, szBuffer ,
wsprintf (szBuffer , TEXT ("%5d" ),
GetSystemMetrics (sysmetrics[ i].Index))) ;
SetTextAlign (hdc , TA_LEFT | TA_TOP ) ;
}
EndPaint (hwnd, & ps) ;
return 0 ;
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam , lParam ) ;
}
SetScrollPos (hwnd, SB_VERT, iVscrollPos , TRUE) ;
InvalidateRect (hwnd, NULL, TRUE) ;
调了InvalidateRect(..,..,TRUE)就是让重绘的。
如果真不想重绘,ValidateRect可以帮助你(可能不是你想要的结果)。