#include<windows.h>

#define FRAME_WIDTH		109
#define FRAME_HEIGHT	109
#define FRAME_SUM		13

LRESULT CALLBACK WindowProc(HWND hWnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
	HDC hdc;
	PAINTSTRUCT ps;
	HBITMAP hBitmap;
	static HDC hMemDC;
	static frame_num;

	switch(uMsg) {
		case WM_CREATE:
			hBitmap=(HBITMAP)LoadImage(0,"butterfly.bmp",IMAGE_BITMAP,0,0,LR_LOADFROMFILE);
			hMemDC=CreateCompatibleDC(NULL);
			SelectObject(hMemDC,hBitmap);
			DeleteObject(hBitmap);
			//タイマー設定
			SetTimer(hWnd,1,100,NULL);
			return 0;
		case WM_DESTROY:
			DeleteDC(hMemDC);
			PostQuitMessage(0);
			return 0;
		case WM_TIMER:
			if(++frame_num >= FRAME_SUM) frame_num=0;
			InvalidateRect(hWnd,NULL,FALSE);
			return 0;
		case WM_PAINT:
			hdc=BeginPaint(hWnd,&ps);
			//表画面へ転送
			BitBlt(hdc,0,0,FRAME_WIDTH,FRAME_HEIGHT,hMemDC,FRAME_WIDTH*frame_num,0,SRCCOPY);
			EndPaint(hWnd,&ps);
			return 0;
	}
	return DefWindowProc(hWnd,uMsg,wParam,lParam);
}

int WINAPI WinMain(
	HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR lpCmdLine,int nCmdShow)
{
	WNDCLASS wc;
	MSG msg;

	wc.style		 = CS_HREDRAW | CS_VREDRAW;
	wc.lpfnWndProc	 = WindowProc;
	wc.cbClsExtra	 = 0;
	wc.cbWndExtra	 = 0;
	wc.hInstance	 = hInstance;
	wc.hIcon		 = LoadIcon(NULL,IDI_APPLICATION);
	wc.hCursor		 = LoadCursor(NULL,IDC_ARROW);
	wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wc.lpszMenuName	 = NULL;
	wc.lpszClassName = __FILE__;
	if(!RegisterClass(&wc)) return 0;

	HWND hWnd=CreateWindow(
		__FILE__,"パラパラアニメーション",
		WS_OVERLAPPEDWINDOW | WS_VISIBLE,
		CW_USEDEFAULT,CW_USEDEFAULT,
		CW_USEDEFAULT,CW_USEDEFAULT, 
		NULL,NULL,hInstance,NULL);
	if(hWnd==NULL) return 0;

	BOOL bRet;
	while((bRet=GetMessage(&msg,NULL,0,0))!=0){
		if(bRet==-1) break;
		DispatchMessage(&msg);
	}

	return (int)msg.wParam;
}