win32_step_3 - 8BitsCoding/RobotMentor GitHub Wiki

LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	if (uMsg == WM_DESTROY) PostQuitMessage(0);
	else if (uMsg == WM_LBUTTONDOWN) {
		// 왼쪽 마우스 클릭
		HDC h_dc = GetDC(hWnd);

		Rectangle(h_dc, 10, 10, 200, 200);
		ReleaseDC(hWnd, h_dc);
	}

	return DefWindowProc(hWnd, uMsg, wParam, lParam);
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	if (uMsg == WM_DESTROY) PostQuitMessage(0);
	else if (uMsg == WM_LBUTTONDOWN) {
		// 왼쪽 마우스 클릭
		HDC h_dc = GetDC(hWnd);

		//int x = lParam & 0x0000FFFF;			// 하위 16비트 값 분리
		//int y = (lParam >> 16) & 0x0000FFFF;	// 상위 16비트 값 분리
		int x = LOWORD(lParam);
		int y = HIWORD(lParam);
        // GET_X_LPARAM(lParam);
        // 도 동일하게 동작하지만 #include <Windowsx.h>를 해줘야함.

		Rectangle(h_dc, x - 15, y - 15, x + 15, y + 15);
		ReleaseDC(hWnd, h_dc);
	}

	return DefWindowProc(hWnd, uMsg, wParam, lParam);
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	if (uMsg == WM_DESTROY) PostQuitMessage(0);
	else if (uMsg == WM_LBUTTONDOWN) {
		// 왼쪽 마우스 클릭
		HDC h_dc = GetDC(hWnd);

		//int x = lParam & 0x0000FFFF;			// 하위 16비트 값 분리
		//int y = (lParam >> 16) & 0x0000FFFF;	// 상위 16비트 값 분리
		int x = LOWORD(lParam);
		int y = HIWORD(lParam);

		if(MK_CONTROL & wParam) Ellipse(h_dc, x - 15, y - 15, x + 15, y + 15);
		else Rectangle(h_dc, x - 15, y - 15, x + 15, y + 15);

		ReleaseDC(hWnd, h_dc);
	}

	return DefWindowProc(hWnd, uMsg, wParam, lParam);
}