Windows Game Programming for Dummies (2nd Edition)/WinGamProgFD.iso/pc/Source/GPCHAP04/PROG4_2.CPP

C/C++ Source or Header | 2002-04-24 | 5.6 KB | 212 lines

// PROG4_2.CPP - A demo of keyboard and mouse input, be sure
// to take a close look at the event handler
// hit escape to exit, or enter to put up a message box
// move the mouse around and press the buttons

// INCLUDES ///////////////////////////////////////////////
#define WIN32_LEAN_AND_MEAN

#include <windows.h>
#include <windowsx.h>
#include <stdio.h>
#include <math.h>

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

// defines for windows
#define WINDOW_CLASS_NAME "WINCLASS1"

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

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

// GLOBALS ////////////////////////////////////////////////
HWND main_window_handle = NULL; // save the window handle

// 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

// what is the message
switch(msg)
    {
    case WM_CREATE:
        {
        // do initialization stuff here
        return(0);
        } break;

    case WM_PAINT:
        {
        // simply validate the window
        hdc = BeginPaint(hwnd,&ps);
        EndPaint(hwnd,&ps);
        return(0);
           } break;

    case WM_KEYDOWN: // this message contains the virtual code
        {
        // test for the escape key (exit)
        if (wparam == VK_ESCAPE)
           {
           // the user is trying to kill the app, we could post
           // a quit message or send a WM_DESTROY message
           // let's do the later
           PostMessage(hwnd, WM_DESTROY,0,0);

           } // end if

        return(0);
        } break;

    case WM_CHAR: // this message contains the ascii code
        {
        // a key has been pressed
        char buffer[80];
        sprintf(buffer,"WM_CHAR: wparam=%c, lparam=%d        ",wparam,lparam);

        // print out the key on the screen
        hdc = GetDC(hwnd);

        // set the colors
        SetTextColor(hdc, RGB(0,255,0));
        SetBkColor(hdc,RGB(0,0,0));
        SetBkMode(hdc,OPAQUE);

        // output the message
        TextOut(hdc,0,0,buffer,strlen(buffer));

        // release dc
        ReleaseDC(hwnd,hdc);

        return(0);
        } break;

    case WM_MOUSEMOVE: // whenever the mouse moves this is sent
         {
        // extract x,y and buttons
        int mouse_x = (int)LOWORD(lparam);
        int mouse_y = (int)HIWORD(lparam);
        int buttons = (int)wparam;

        char buffer[80];
        sprintf(buffer,"WM_MOUSEMOVE: x=%d y=%d buttons=%d        ",
                mouse_x,mouse_y,buttons);

        // print out the key on the screen
        hdc = GetDC(hwnd);

        // set the colors
        SetTextColor(hdc, RGB(255,0,0));
        SetBkColor(hdc,RGB(0,0,0));
        SetBkMode(hdc,OPAQUE);

        // output the message
        TextOut(hdc,0,16,buffer,strlen(buffer));

        // release dc
        ReleaseDC(hwnd,hdc);

        return(0);
        } break;

    case WM_DESTROY:
        {
        // kill the application
        PostQuitMessage(0);
        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)
{

WNDCLASS winclass;    // this will hold the class we create
HWND     hwnd;        // generic window handle
MSG         msg;        // generic message

// first fill in the window class stucture
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;

// register the window class
if (!RegisterClass(&winclass))
    return(0);

// create the window
if (!(hwnd = CreateWindow(WINDOW_CLASS_NAME, // class
                          "Hello Dave",         // title
                          WS_OVERLAPPEDWINDOW | WS_VISIBLE,
                           0,0,       // x,y
                          320,200, // width, height
                          NULL,       // handle to parent
                          NULL,       // handle to menu
                          hinstance,// instance
                          NULL)))    // creation parms
return(0);

// save the window handle in a global
main_window_handle = hwnd;

// enter main event loop
while(1)
    {
    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

    // here's a demo of the KEY_DOWN macro
    if (KEY_DOWN(VK_RETURN))
       MessageBox(NULL, "You Pressed <ENTER> Didn't You?",
                 "Asynchronous Keyboard Test",MB_OK);


    } // end while

// return to Windows like this
return(msg.wParam);

} // end WinMain

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