#include<windows.h>

#define WIDTH	197
#define HEIGHT	100

LRESULT CALLBACK WindowProc(HWND hWnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
	HDC hdc;
	PAINTSTRUCT ps;
	static LPBYTE lpPixel;
	static BITMAPINFO bmpInfo;
	static HDC hMemDC;
	HBITMAP hBitmap;
	int x,y;
	static int length;

	switch(uMsg) {
		case WM_CREATE:
			//4の倍数に補正
			if(WIDTH*3%4) length=WIDTH*3+(4-WIDTH*3%4);
			else length=WIDTH*3;
			//DIB作成
			lpPixel=(LPBYTE)HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,length*HEIGHT);
			bmpInfo.bmiHeader.biSize=sizeof(BITMAPINFOHEADER);
			bmpInfo.bmiHeader.biWidth=WIDTH;
			bmpInfo.bmiHeader.biHeight=HEIGHT;
			bmpInfo.bmiHeader.biPlanes=1;
			bmpInfo.bmiHeader.biBitCount=24;
			bmpInfo.bmiHeader.biCompression=BI_RGB;

			//灰色で塗りつぶす
			FillMemory(lpPixel,length*HEIGHT,0x80);

			//DIB→DDB変換
			hdc=GetDC(hWnd);
			hBitmap=CreateDIBitmap(hdc,&bmpInfo.bmiHeader,CBM_INIT,lpPixel,&bmpInfo,DIB_RGB_COLORS);
			hMemDC=CreateCompatibleDC(hdc);
			SelectObject(hMemDC,hBitmap);
			DeleteObject(hBitmap);
			ReleaseDC(hWnd,hdc);

			for(y=25;y<50;y++){		//DIBに描画
				for(x=25;x<50;x++){
					lpPixel[(x*3  )+y*length]=0;	//B
					lpPixel[(x*3+1)+y*length]=0;	//G
					lpPixel[(x*3+2)+y*length]=255;	//R
				}
			}
			Rectangle(hMemDC,25,25,50,50);		//DDBに描画
			return 0;
		case WM_DESTROY:
			DeleteDC(hMemDC);	//DDB削除
			HeapFree(GetProcessHeap(),0,lpPixel);	//DIB削除
			PostQuitMessage(0);
			return 0;
		case WM_PAINT:
			hdc=BeginPaint(hWnd,&ps);
			BitBlt(hdc,0,0,WIDTH,HEIGHT,hMemDC,0,0,SRCCOPY);	//DDBを表画面へ転送
			StretchDIBits(hdc,250,0,WIDTH,HEIGHT,	//DIBを表画面へ転送
				0,0,WIDTH,HEIGHT,lpPixel,&bmpInfo,DIB_RGB_COLORS,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__,"24ビットDIB→DDB変換",
		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;
}