使用CreateWindowsW()无法改变窗口样式

 代码如下：

#include <Windows.h>
#include <tchar.h>
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
{
	HDC hdc;
	PAINTSTRUCT ps;//结构
	switch (message)
	{
	case WM_PAINT:
		hdc = BeginPaint(hwnd, &ps);
		SetMapMode(hdc, MM_ANISOTROPIC);
		Ellipse(hdc, 0, 0, 400, 400);	//大圆脸
		Ellipse(hdc, 50, 50, 150, 150);	//左眼Σ(っ °Д °;)っ
		Ellipse(hdc, 250, 50, 350, 150);	//右眼Σ(っ °Д °;)っ
		Arc(hdc, 100, 200, 300, 350, 120, 275, 400, 275);	//嘴巴
		EndPaint(hwnd, &ps);
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProcW(hwnd, message, wparam, lparam);
	}
	return 0;
}
int WINAPI WinMain(_In_ HINSTANCE hThisInst, _In_opt_ HINSTANCE hPrevInst, _In_ LPSTR lpszCmdLine, _In_ INT ncmdShow)
{
	HWND hwnd;
	MSG msg;
	WNDCLASSEX wndclassex;
	TCHAR lpszclassname[] = L"画画";
	TCHAR lpszclassTitle[] = L"这是一个笑脸";
	wndclassex.cbSize = sizeof(WNDCLASSEX);
	wndclassex.style = 0;
	wndclassex.lpfnWndProc = WndProc;
	wndclassex.cbClsExtra = 0;
	wndclassex.cbWndExtra = 0;
	wndclassex.hInstance = hThisInst;
	wndclassex.hIcon = LoadIcon(hThisInst, MAKEINTRESOURCE(IDI_APPLICATION));
	wndclassex.hCursor = LoadCursorW(hThisInst, MAKEINTRESOURCE(IDC_ARROW));
	wndclassex.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wndclassex.lpszMenuName = NULL;
	wndclassex.lpszClassName = lpszclassname;
	wndclassex.hIconSm = LoadIcon(wndclassex.hInstance, MAKEINTRESOURCE(IDI_APPLICATION));
	if (!RegisterClassExW(&wndclassex))
	{
		MessageBeep(0);
		return FALSE;
	}
	hwnd = CreateWindowW(lpszclassname, lpszclassTitle, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hThisInst, NULL);
	ShowWindow(hwnd, ncmdShow);
	UpdateWindow(hwnd);
	while (GetMessageW(&msg, NULL, 0, 0))
	{
		TranslateMessage(&msg);
		DispatchMessageW(&msg);
	}
	return msg.wParam;
}

 遇到的问题是在"CreateWindowW()"函数中看书上第三个参数可以改变创建窗口的样式，我尝试了"WS_MAXIMIZEBOX"的样式，发现结果并没有出现最大化按钮的窗口，我查了一下有的说是还需要加入"WS_VISIBLE",还有说是在"ShowWindow()"中加入"SW_Show"等，但是我运行的时候都失败了，所以说是这么改的吗？如果哪里弄错，请各位大佬指出，谢谢

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