ビットマップの情報

ビットマップの大きさ

//リソーススクリプト
KITTY BITMAP "test.bmp"

#include <windows.h>

LRESULT CALLBACK WndProc(HWND hwnd , UINT msg , WPARAM wp , LPARAM lp) {
	HDC hdc , hBuffer;
	PAINTSTRUCT ps;
	RECT rect;
	static HBITMAP hBitmap;
	static BITMAP bmBitmap;

	switch (msg) {
	case WM_DESTROY:
		DeleteObject(hBitmap);
		PostQuitMessage(0);
		return 0;
	case WM_CREATE:
		hBitmap = LoadBitmap(
				((LPCREATESTRUCT)lp)->hInstance ,
				TEXT("KITTY")
		);
		GetObject(hBitmap , sizeof (BITMAP) , &bmBitmap);		
		return 0;
	case WM_PAINT:
		hdc = BeginPaint(hwnd , &ps);
		hBuffer = CreateCompatibleDC(hdc);
		SelectObject(hBuffer , hBitmap);

		GetClientRect(hwnd , &rect);
		StretchBlt(
			hdc ,
			rect.right / 2 - bmBitmap.bmWidth / 4 , 
			rect.bottom / 2 - bmBitmap.bmHeight / 4 ,
			bmBitmap.bmWidth / 2 , bmBitmap.bmHeight / 2 ,
			hBuffer , 0 , 0 ,
			bmBitmap.bmWidth , bmBitmap.bmHeight ,
			SRCCOPY
		);

		DeleteDC(hBuffer);
		EndPaint(hwnd , &ps);
		return 0;
	}
	return DefWindowProc(hwnd , msg , wp , lp);
}

int WINAPI WinMain(HINSTANCE hInstance , HINSTANCE hPrevInstance ,
			PSTR lpCmdLine , int nCmdShow ) {
	HWND hwnd;
	MSG msg;
	WNDCLASS winc;
	
	winc.style		= CS_HREDRAW | CS_VREDRAW;
	winc.lpfnWndProc	= WndProc;
	winc.cbClsExtra	= winc.cbWndExtra	= 0;
	winc.hInstance		= hInstance;
	winc.hIcon		= LoadIcon(NULL , IDI_APPLICATION);
	winc.hCursor		= LoadCursor(NULL , IDC_ARROW);
	winc.hbrBackground	= (HBRUSH)GetStockObject(WHITE_BRUSH);
	winc.lpszMenuName	= NULL;
	winc.lpszClassName	= TEXT("KITTY");

	if (!RegisterClass(&winc)) return -1;

	hwnd = CreateWindow(
			TEXT("KITTY") , TEXT("Kitty on your lap") ,
			WS_OVERLAPPEDWINDOW | WS_VISIBLE ,
			CW_USEDEFAULT , CW_USEDEFAULT ,
			CW_USEDEFAULT , CW_USEDEFAULT ,
			NULL , NULL ,
			hInstance , NULL
	);

	if (hwnd == NULL) return -1;

	while(GetMessage(&msg , NULL , 0 , 0)) {
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return msg.wParam;
}

GetObject()