Win32 API create window

win32_create_window.c

void create_window(HINSTANCE module, LPCTSTR class_name, LPCTSTR title) {
    // 1. filling WNDCLASS / WNDCLASSEX
    // wc = {} and wc {.hCursor = ..., .hInstance = ...} don't work in VS2017
    WNDCLASS wc = {0};
    
    // Only 3 components are necessary
    // hCursor sets the cursor for when the mouse is over the window
    wc.hCursor = LoadCursor(nullptr, IDC_ARROW);
    // hInstance is the handle to the module's instance 
    // and lpszClassName is the window class name.
    // both form a "key" to identify the window within the process
    wc.hInstance = module;
    wc.lpszClassName = name;
    
    // necessary if the window should handle events immediately after creation
    wc.lpfnWndProc = ...

    // 2. calling RegisterClass() / RegisterClassEx()
    VERIFY(RegisterClass(&wc));

    // 3. calling CreateWindow() / CreateWindowEx()
    VERIFY(CreateWindow(
        // class name
        wc.lpszClassName,
        // title
        title,
        // WS_VISIBLE so we don't have an extra call to ShowWindow()
        WS_OVERLAPPEDWINDOW | WS_VISIBLE,
        // x, y, width, height
        CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
        // parent, menu, module, lpparam (arbitrary LPVOID param)
        // nullptr available?
        NULL, NULL, module, NULL
    ));
}