How to create a splash screen for loading a C++ program?

Question

C++ / C#

I want to make a screen saver for my program so that when it starts, a window with a picture and text is displayed. The main problem is how to make the image be displayed on a transparent background, as, for example, it was done when loading Photoshop?
Working in C++ builder environment

Answer 1

HWND hLogin = CreateWindowEx(WS_EX_LAYERED,
            L"wnd_class_name", // вами придуманное имя класса, предварительно зарегистрированное
               L"Login", WS_POPUP, 200, 200, 200, 200,
               NULL, NULL, hInstance, NULL);
// для отрисовки используете функцию ниже и картинку с альфа каналом
UpdateLayeredWindow(hWnd, NULL, NULL, &sz, hdc, &ptSrc, 0, &bf, ULW_ALPHA);