the load function (C++ Learning Community)

Title: the load function

sleepyo - January 16, 2007 04:09 PM (GMT)

i typed this code out of Game Programming for beginers but it doesnot work. Its something with the loadimage function.

CODE

# include <windows.h>
# include <winuser.h>
# include <stdio.h>
# include <stdlib.h>
# include <time.h>

# define APPTITLE "Game loop"

// function prototypes

LRESULT CALLBACK WinProc(HWND, UINT, WPARAM, LPARAM);
ATOM MyRegisterClass(HINSTANCE);
bool InitInstance(HINSTANCE, int);
void DrawBitmap(HDC, char*, int, int);
void Game_Init();
void Game_Run();
void Game_End();

// local variables
HWND global_hwnd;
HDC global_hdc;

LRESULT CALLBACK WinProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
global_hwnd=hWnd;
global_hdc=GetDC(hWnd);

switch(message)
{
case WM_DESTROY:
PostQuitMessage(0);
break;
}
return DefWindowProc(hWnd, message, wParam, lParam);
}

ATOM MyRegisterClass(HINSTANCE hInstance)
{
//create the claass structure
WNDCLASSEX wc;
wc.cbSize=sizeof(WNDCLASSEX);
//fillt the struct with info
wc.style= CS_HREDRAW|CS_VREDRAW;
wc.lpfnWndProc=(WNDPROC)WinProc;
wc.cbClsExtra=0;
wc.cbWndExtra=0;
wc.hInstance= hInstance;
wc.hIcon= NULL;
wc.hCursor= LoadCursor(NULL,IDC_ARROW);
wc.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
wc.lpszMenuName= NULL;
wc.lpszClassName= "APPTITLE";
wc.hIconSm = NULL;

// set up the window wtih the class info
return RegisterClassEx(&wc);
}

bool InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;

// create a new window
hWnd= CreateWindow(
"APPTITLE",//window class
"GL",//title bar
WS_OVERLAPPEDWINDOW | //window style
WS_VISIBLE |
WS_SYSMENU,//window style
CW_USEDEFAULT,//x positon
CW_USEDEFAULT,//y postion
500,//width of window
400,//height of window
NULL,//parent window
NULL,//menu
hInstance,// application instance
NULL);//window parameter

//if erreor creating window
if(!hWnd)
return false;
//display the window
ShowWindow(hWnd,nCmdShow);
UpdateWindow(hWnd);

return true;
}

//entry point for
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPTSTR lpCmdLine, int nCmdShow){
// declare variables
MSG msg;

// register the class
MyRegisterClass(hInstance);

// intialize application
if (!InitInstance(hInstance,nCmdShow))
return false;
// intialize the game
Game_Init();
int done=0;
while(done!=1)
{
if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
//look for quit message
if(msg.message==WM_QUIT)
done=1;

//decode and pass the messages on to WndProc
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
// do game cleanup
Game_End();

msg.wParam;
}

void Game_Init()
{
// load bitmaps
srand(time(NULL));
}

void Game_Run()
{
int x=0, y=0;
RECT rect;
GetClientRect(global_hwnd, &rect);

if(rect.right>0)
{
x= rand()%(rect.right-rect.left);
y= rand()%(rect.bottom-rect.top);
DrawBitmap(global_hdc, "c.bmp", x, y);
}
}

void Game_End()
{
}

void DrawBitmap(HDC hdcDest, char *filename, int x, int y)
{
HBITMAP image;
BITMAP bm;
HDC hdcMem;

//load the btimap image
image= LoadImage(0, "c.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);

//read the bitmap's properties
GetObject(image, sizeof(BITMAP), &bm);

//crate a device context fot the bitmap
hdcMem=CreateCompatibleDC(global_hdc);
SelectObject(hdcMem, image);

//draw the bitmap to the window
BitBlt(
global_hdc,//destination device context
x,y,//x and y destination
bm.bmWidth, bm.bmHeight,//widht, height of bitmap
hdcMem,//source bitmap context
0, 0,// start x,y on soure bitmap
SRCCOPY);//blit method

//delete the context and bitmap
DeleteDC(hdcMem);
DelteObject((HBITMAP)image);
}

Ravotus Edit: Please use code blocks, thanks!

PinguinDude - January 19, 2007 05:52 AM (GMT)

image = (HBITMAP)LoadImage(0, "c.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);

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