Win32 create window and button (lightweight)

Don't talk much , It's all in the notes , Code up ：

#include <Windows.h>
#include <stdio.h>

// Button ID
#define IDC_BUTTON_CLICK 150

// Button click event 
void OnButtonClick()
{
	::MessageBox(NULL, L" Hello ", L" Ha ha ha ", MB_OK);
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT msgID, WPARAM wParam, LPARAM lParam)
{
	switch (msgID)
	{
	case WM_CLOSE:
		DestroyWindow(hWnd);
		break;
	case WM_CREATE:
		// Create a button on the interface 
		CreateWindow(L"button",// It has to be for ：button, This is a button class name 
			L" Am I ",// The characters displayed on the button     
			WS_CHILD | WS_VISIBLE,
			200, 200, 50, 30,  // Where the button appears on the interface 
			hWnd, (HMENU)IDC_BUTTON_CLICK,  // Set button ID, Just set a number casually 
			((LPCREATESTRUCT)lParam)->hInstance, NULL);
		break;
	// Destruction of the window 
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	case WM_COMMAND:
		if (wParam == IDC_BUTTON_CLICK)
		{
			// Enter button click event 
			OnButtonClick();
		}
		break;
	default:
		DefWindowProc(hWnd, msgID, wParam, lParam);
	}
	return 1;
}

int __stdcall WinMain(HINSTANCE hIns