JOYTOY.C
/* joytoy.c - WinMain() and WndProc() for JOYTOY, along with
* initialization and support code.
*
* JOYTOY is a Windows with Multimedia application that illustrates
* how to use the joystick services. When run, it presents the user
* with a crosshair cursor. When the joystick or the mouse is moved,
* the cursor follows. When a joystick button is pressed, JOYTOY
* produces a sound and draws a bullet hole icon onto the screen.
*
*
* THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
* ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR
* A PARTICULAR PURPOSE.
*
* Copyright 1993 - 1998 Microsoft Corporation. All Rights Reserved.
*/
#include <windows.h>
#include <mmsystem.h>
#include "joytoy.h"
char szAppName[] = "JoyToy";
HANDLE hSound1, hSound2;
HANDLE hHole;
LPSTR lpSound1, lpSound2;
/* WinMain - Entry point for JOYTOY.
*/
int PASCAL WinMain(hInstance,hPrevInstance,lpszCmdLine,cmdShow)
HINSTANCE hInstance,hPrevInstance;
LPSTR lpszCmdLine;
int cmdShow;
{
MSG msg;
/* Initialize the application.
*/
if(! InitJoyToy(hInstance,hPrevInstance))
return FALSE;
/* Standard Windows message processing loop. We don't drop out of
* this loop until the user quits the application.
*/
while(GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
/* Unlock and free resources allocated by InitJoyToy().
*/
UnlockResource(hSound1);
UnlockResource(hSound2);
FreeResource(hSound1);
FreeResource(hSound2);
FreeResource(hHole);
return (msg.wParam);
}
/* DrawSight - Takes the new joystick position and moves the
* mouse cursor accordingly.
*
* Params: lParam - Specifies the new joystick position. The
* high-order word is the y position and the low-order word is
* the x position.
*
* Returns: void
*/
void DrawSight(DWORD lParam)
{
WORD x, y;
POINT pt;
/* Get the current cursor position in screen coordinates.
*/
GetCursorPos(&pt);
/* Joystick positions are expressed in a coordinate system with the
* origin in the upper left corner and with coordinate ranges from
* 0 to 65535. Take the 5 most significant bits, so the position is
* expressed in the range of 0 to 31.
*/
x = LOWORD(lParam) >> 11;
y = HIWORD(lParam) >> 11;
/* If the joystick is to the left of the center position, then move
* the cursor position to the left. Otherwise, if the joystick is to
* the right of the center position, then move the cursor position
* to the right.
*/
if(x <= 12)
pt.x = pt.x + x - 17;
else if(x >= 20)
pt.x = pt.x + x - 15;
/* If the joystick is below the center position, then move the cursor
* position down. Otherwise, if the joystick is above the center
* position, then move the cursor position up.
*/
if(y <= 12)
pt.y = pt.y + y - 17;
else if(y >= 20)
pt.y = pt.y + y - 15;
/* Set the new cursor position.
*/
SetCursorPos(pt.x, pt.y);
}
/* DrawHole - Draws an icon representing a hole in the given window at the
* current cursor position.
*
* Params: hWnd - Specifies the handle to the window to draw in.
*
* Returns: void
*/
void DrawHole(HWND hWnd)
{
HDC hDC;
POINT pt;
/* Get the current cursor position.
*/
GetCursorPos(&pt);
/* Get a DC, draw the icon, release DC.
*/
hDC = GetDC(hWnd);
DrawIcon(hDC, pt.x - 16, pt.y - 16, hHole);
ReleaseDC(hWnd, hDC);
}
/* WndProc - Main window procedure function.
*/
LRESULT FAR PASCAL WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch(message)
{
case WM_CREATE:
/* Capture the joystick. If this fails, beep and display
* error, then quit.
*/
if(joySetCapture(hWnd, JOYSTICKID1, 0, FALSE))
{
MessageBeep(MB_ICONEXCLAMATION);
MessageBox(hWnd, "Couldn't capture the joystick", NULL,
MB_OK | MB_ICONEXCLAMATION);
return -1;
}
break;
case WM_ACTIVATE:
case WM_ACTIVATEAPP:
/* If app becomes inactive (wParam == 0), then we want to quit.
*/
if(wParam)
break;
case WM_LBUTTONDOWN:
case WM_MBUTTONDOWN:
case WM_RBUTTONDOWN:
case WM_KEYDOWN:
case WM_CHAR:
/* Also, any keystrokes or mouse buttons cause us to quit.
*/
PostMessage(hWnd,WM_CLOSE,0,0L);
break;
case WM_ERASEBKGND:
/* Process this message to keep Windows from erasing background.
*/
return 0l;
case MM_JOY1BUTTONDOWN :
/* Joystick button pressed. Detect which button, play appropriate
* sound, then draw bullet hole. To play sound, pass
* sndPlaySound() a pointer to an in-memory WAVE file and
* specify the SND_MEMORY flag. Specify SND_LOOP and SND_ASYNC
* so that sound keeps playing until it's turned off after
* joystick button is released.
*/
if (wParam & JOY_BUTTON1CHG)
{
sndPlaySound(lpSound1, SND_LOOP | SND_ASYNC | SND_MEMORY);
DrawHole(hWnd);
}
else if (wParam & JOY_BUTTON2CHG)
{
sndPlaySound(lpSound2, SND_LOOP | SND_ASYNC | SND_MEMORY);
DrawHole(hWnd);
}
break;
case MM_JOY1BUTTONUP :
/* Stop playing looped sound.
*/
if (wParam & JOY_BUTTON1)
sndPlaySound(lpSound1, SND_LOOP | SND_ASYNC | SND_MEMORY);
else if (wParam & JOY_BUTTON2)
sndPlaySound(lpSound2, SND_LOOP | SND_ASYNC | SND_MEMORY);
else
sndPlaySound(NULL, 0);
break;
case MM_JOY1MOVE :
/* If joystick buttons are pressed, draw bullet holes
* while joystick is moved.
*/
if(wParam & (JOY_BUTTON1 | JOY_BUTTON2))
DrawHole(hWnd);
/* Redraw the crosshair in its new position.
*/
DrawSight(lParam);
break;
case WM_DESTROY:
/* We're shutting down. Release capture on the joystick,
* make sure any sounds that are playing are stopped.
*/
joyReleaseCapture(JOYSTICKID1);
sndPlaySound(NULL, 0);
PostQuitMessage(0);
break;
}
return DefWindowProc(hWnd, message, wParam, lParam);
}
/* InitJoyToy - Application initialization routine.
*
* Params: hInstance - App's instance handle.
*
* Returns: TRUE if initialization is successful, FALSE otherwise.
*/
BOOL InitJoyToy(HANDLE hInstance, HANDLE hPrevInstance)
{
WNDCLASS wc;
HWND hWnd;
/* Make sure there is a joystick device installed.
*/
if (!joyGetNumDevs())
{
MessageBox(NULL, "There are no joystick devices installed. Exiting.",
NULL, MB_OK | MB_ICONEXCLAMATION);
return FALSE;
}
/* Load bullet hole icon.
*/
hHole = LoadIcon(hInstance, "HoleIcon");
if (hPrevInstance == NULL) {
/* Setup and register a window class for our main window.
*/
wc.hCursor = LoadCursor(NULL, IDC_CROSS);
wc.hIcon = NULL;
wc.lpszMenuName = NULL;
wc.lpszClassName = szAppName;
wc.hbrBackground = GetStockObject(BLACK_BRUSH);
wc.hInstance = hInstance;
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
if(! RegisterClass(&wc))
return FALSE;
}
/* Create a full-screen window with no title bar or scroll bars.
*/
hWnd = CreateWindow(szAppName, szAppName, WS_POPUP | WS_VISIBLE, 0, 0,
GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN),
NULL, NULL, hInstance, NULL);
if (hWnd != NULL) {
/* Load and lock sound resources.
*/
hSound1 = LoadResource(hInstance, FindResource(hInstance, "SOUND1", "WAVE"));
hSound2 = LoadResource(hInstance, FindResource(hInstance, "SOUND2", "WAVE"));
lpSound1 = LockResource(hSound1);
lpSound2 = LockResource(hSound2);
}
return hWnd != NULL;
}