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#include <windows.h>
LRESULT CALLBACK WndProc(HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam);
int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPreInst, LPSTR lpszCmdLine, int nCmdShow)
{
HWND hWnd;
MSG msg;
WNDCLASSEX wc;
//fill the WNDCLASSEX object with the appropriate values
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInst;
wc.hIcon = LoadIcon(NULL, IDI_EXCLAMATION);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wc.lpszMenuName = NULL;
wc.lpszClassName = "BouncingBall";
wc.hIconSm = LoadIcon(NULL, IDI_EXCLAMATION);
//register the new class
RegisterClassEx(&wc);
//create a window
hWnd = CreateWindowEx(
NULL,
wc.lpszClassName,
"The Bouncing Ball Program",
WS_OVERLAPPEDWINDOW | WS_VISIBLE,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInst,
NULL
);
//event loop - handle all messages
while(GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
//standard return value
return (int)(msg.wParam);
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam)
{
//static variables used to keep track of the balls position
static int dX = 5, dY = 5; //stores directions
//stores position
static int x = 0, y = 0, oldX = 0, oldY = 0;
//device context and brush used for drawing
HDC hDC;
HBRUSH brush;
//find out which message is being set
switch(nMsg)
{
case WM_CREATE:
//create the timer (0.02 seconds)
SetTimer(hWnd, 1, 20, NULL);
break;
case WM_TIMER:
//when the timer goes off (only one)
//get the dc for drawing
hDC = GetDC(hWnd);
//use pure white
brush = (HBRUSH)SelectObject(hDC, GetStockObject(WHITE_BRUSH));
//fill a RECT object with the appropriate values
RECT temp;
temp.left = oldX;
temp.top = oldY;
temp.right = oldX + 30;
temp.bottom = oldY + 30;
//cover the old ellipse
FillRect(hDC, &temp, brush);
//get ready to draw the new ellipse
brush = (HBRUSH)SelectObject(hDC, GetStockObject(GRAY_BRUSH));
//draw it
Ellipse(hDC, x, y, 30 + x, 30 + y);
//update the values
oldX = x;
oldY = y;
//prep the new coordinates for next time
x += dX;
y += dY;
//get the window size and store it in rect
RECT rect;
GetClientRect(hWnd, &rect);
//if the circle is going off the edge then reverse its direction
if(x + 30 > rect.right || x < 0)
{
dX = -dX;
}
if(y + 30 > rect.bottom || y < 0)
{
dY = -dY;
}
//put the old brush back
SelectObject(hDC, brush);
//release the dc
ReleaseDC(hWnd, hDC);
break;
case WM_DESTROY:
//destroy the timer
KillTimer(hWnd, 1);
//end the program
PostQuitMessage(0);
break;
default:
//let Windows handle every other message
return(DefWindowProc(hWnd, nMsg, wParam, lParam));
}
return 0;
}
Compiler errors
Quote
c:\documents and settings\kevin\my documents\prog projects\bounce\bounce\bounce.cpp(22) : error C2440: '=' : cannot convert from 'const char [13]' to 'LPCWSTR'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
c:\documents and settings\kevin\my documents\prog projects\bounce\bounce\bounce.cpp(42) : error C2664: 'CreateWindowExW' : cannot convert parameter 3 from 'const char [26]' to 'LPCWSTR'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
c:\documents and settings\kevin\my documents\prog projects\bounce\bounce\bounce.cpp(42) : error C2664: 'CreateWindowExW' : cannot convert parameter 3 from 'const char [26]' to 'LPCWSTR'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
I've tried changing 'wc.lpszClassName' around, LPSTR as well as CreateWindowEx...so far nothing has had any luck with running the program.
Any suggestions?
MultiQuote
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