Windows 游戏编程大师技巧第四章第6个例子---定时器的使用

// DEMO4_6.CPP - WM_TIMER demo

// INCLUDES ///////////////////////////////////////////////

#define WIN32_LEAN_AND_MEAN // just say no to MFC

#include <windows.h> // include all the windows headers

#include <windowsx.h> // include useful macros

#include <mmsystem.h> // very important and include WINMM.LIB too!

#include <stdio.h>

#include <stdlib.h>

#include <math.h>

// DEFINES ////////////////////////////////////////////////

// defines for windows

#define WINDOW_CLASS_NAME "WINCLASS1"

#define WINDOW_WIDTH 400

#define WINDOW_HEIGHT 300

// timer defines

#define TIMER_ID1_SEC 1 // id of 1 sec timer

#define TIMER_ID3_SEC 2 // id of 3 sec timer

#define TIMER_ID30_SEC 3 // id of 30 sec timer

// MACROS /////////////////////////////////////////////////

#define KEYDOWN(vk_code) ((GetAsyncKeyState(vk_code) & 0x8000) ? 1 : 0)

#define KEYUP(vk_code) ((GetAsyncKeyState(vk_code) & 0x8000) ? 0 : 1)

// GLOBALS ////////////////////////////////////////////////

HWND main_window_handle = NULL; // globally track main window

HINSTANCE hinstance_app = NULL; // globally track hinstance

char buffer[80]; // general printing buffer

// FUNCTIONS //////////////////////////////////////////////

LRESULT CALLBACK WindowProc(HWND hwnd,

UINT msg,

WPARAM wparam,

LPARAM lparam)

{

// this is the main message handler of the system

PAINTSTRUCT ps; // used in WM_PAINT

HDC hdc; // handle to a device context

char buffer[80]; // used to print strings

static int counter1=0, // counters

counter2=0,

counter3=0;

// what is the message

switch(msg)

{

case WM_CREATE:

{

// do initialization stuff here

// create a 1 second timer

SetTimer(hwnd, TIMER_ID1_SEC, 1000,NULL);

// now the 3 second timer

SetTimer(hwnd, TIMER_ID3_SEC, 3000,NULL);

// and finally the 30 second timer

SetTimer(hwnd, TIMER_ID30_SEC, 30000,NULL);

// return success

return(0);

} break;

case WM_TIMER:

{

// there is a timer event, test what timer fired

switch(wparam)

{

case TIMER_ID1_SEC:

{

// print out a message

// get the dc

hdc = GetDC(hwnd);

// set the color

SetTextColor(hdc,RGB(0,255,0));

SetBkColor(hdc,RGB(0,0,0));

SetBkMode(hdc,OPAQUE);

// build up the messages

sprintf(buffer,"The 1 second timer has fired %d times",++counter1);

// print the message

TextOut(hdc,0,0,buffer,strlen(buffer));

// release the dc

ReleaseDC(hwnd,hdc);

} break;

case TIMER_ID3_SEC:

{

// make a beep

MessageBeep(MB_ICONEXCLAMATION);

// get the dc

hdc = GetDC(hwnd);

// set the color

SetTextColor(hdc,RGB(0,255,0));

SetBkColor(hdc,RGB(0,0,0));

SetBkMode(hdc,OPAQUE);

// build up the messages

sprintf(buffer,"The 3 second timer has fired %d times",++counter2);

// print the message

TextOut(hdc,0,20,buffer,strlen(buffer));

// release the dc

ReleaseDC(hwnd,hdc);

} break;

case TIMER_ID30_SEC:

{

// make a beep

MessageBeep(MB_ICONEXCLAMATION);

// get the dc

hdc = GetDC(hwnd);

// set the color

SetTextColor(hdc,RGB(0,255,0));

SetBkColor(hdc,RGB(0,0,0));

SetBkMode(hdc,OPAQUE);

// build up the messages

sprintf(buffer,"The 30 second timer has fired %d times",++counter3);

// print the message

TextOut(hdc,0,40,buffer,strlen(buffer));

// release the dc

ReleaseDC(hwnd,hdc);

} break;

// .. test for other id's

default:break;

} // end switch

} break;

case WM_PAINT:

{

// simply validate the window

hdc = BeginPaint(hwnd,&ps);

// end painting

EndPaint(hwnd,&ps);

// return success

return(0);

} break;

case WM_DESTROY:

{

// kill the application, this sends a WM_QUIT message

KillTimer(hwnd,TIMER_ID1_SEC);

KillTimer(hwnd,TIMER_ID3_SEC);

KillTimer(hwnd,TIMER_ID30_SEC);

PostQuitMessage(0);

// return success

return(0);

} break;

default:break;

} // end switch

// process any messages that we didn't take care of

return (DefWindowProc(hwnd, msg, wparam, lparam));

} // end WinProc

// WINMAIN ////////////////////////////////////////////////

int WINAPI WinMain( HINSTANCE hinstance,

HINSTANCE hprevinstance,

LPSTR lpcmdline,

int ncmdshow)

{

WNDCLASSEX winclass; // this will hold the class we create

HWND hwnd; // generic window handle

MSG msg; // generic message

HDC hdc; // graphics device context

// first fill in the window class stucture

winclass.cbSize = sizeof(WNDCLASSEX);

winclass.style = CS_DBLCLKS | CS_OWNDC |

CS_HREDRAW | CS_VREDRAW;

winclass.lpfnWndProc = WindowProc;

winclass.cbClsExtra = 0;

winclass.cbWndExtra = 0;

winclass.hInstance = hinstance;

winclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);

winclass.hCursor = LoadCursor(NULL, IDC_ARROW);

winclass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);

winclass.lpszMenuName = NULL;

winclass.lpszClassName = WINDOW_CLASS_NAME;

winclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

// save hinstance in global

hinstance_app = hinstance;

// register the window class

if (!RegisterClassEx(&winclass))

return(0);

// create the window

if (!(hwnd = CreateWindowEx(NULL, // extended style

WINDOW_CLASS_NAME, // class

"Multiple Timer Demo", // title

WS_OVERLAPPEDWINDOW | WS_VISIBLE,

0,0, // initial x,y

WINDOW_WIDTH, // initial width

WINDOW_HEIGHT,// initial height

NULL, // handle to parent

NULL, // handle to menu

hinstance,// instance of this application

NULL))) // extra creation parms

return(0);

// save main window handle

main_window_handle = hwnd;

// get the graphics device context

hdc = GetDC(hwnd);

// enter main event loop, but this time we use PeekMessage()

// instead of GetMessage() to retrieve messages

while(TRUE)

{

// test if there is a message in queue, if so get it

if (PeekMessage(&msg,NULL,0,0,PM_REMOVE))

{

// test if this is a quit

if (msg.message == WM_QUIT)

break;

// translate any accelerator keys

TranslateMessage(&msg);

// send the message to the window proc

DispatchMessage(&msg);

} // end if

// main game processing goes here

if (KEYDOWN(VK_ESCAPE))

SendMessage(hwnd, WM_CLOSE, 0,0);

} // end while

// release the device context

ReleaseDC(hwnd,hdc);

// return to Windows like this

return(msg.wParam);

} // end WinMain

///////////////////////////////////////////////////////////

定时器的使用:

1.创建定时器

UINT_PTR SetTimer(

HWND hWnd,
UINT_PTR nIDEvent,
UINT uElapse,
TIMERPROC lpTimerFunc
);

2.处理WM_TIMER消息 wparam标识定时器ID 或者 写lpTimerFunc

3.销毁定时器

BOOL KillTimer(

HWND hWnd,
UINT_PTR uIDEvent
);