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计时器(九)

2010-12-30 21:12:14 · 作者: · 浏览: 16733
标签: 计时器
示的BEEPER2程式与BEEPER1是相同的。注意，TimerProc和WndProc一起被宣告在程式的开始处。

 程式8-2 BEEPER2
BEEPER2.C
/*---------------------------------------------------------------------------
BEEPER2.C -- Timer Demo Program No. 2
(c) Charles Petzold, 1998
---------------------------------------------------------------------------*/

#include <windows.h>
#define ID_TIMER 1

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
VOID CALLBACK TimerProc (HWND, UINT, UINT, DWORD ) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static char szAppName[] = "Beeper2" ;
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 = szA