ELS initialization window class

#include<Windows.h>
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPreInstance,LPSTR ipCmdLine,int nCmdShow)
{
    // Initialize window class .
    WNDCLASSEX db;//WNDCLASS An extension of .
    
    db.cbClsExtra = 0;// An extra space immediately following the end of the window class , Do not set to 0.
    db.cbSize = sizeof(WNDCLASSEX);// Structure size ,sizeof(WNDCLASSEX).
    db.cbWndExtra = 0;// An extra space immediately following the end of the window's real column , Do not set to 0.
    db.hbrBackground = (HBRUSH)COLOR_WINDOW;// Background brush of window class , Brush handle for background , It can also be the system color value .
    db.hCursor = NULL;// Cursor style , Do not set to NULL,TODO, test .
    db.hIcon = NULL;// Icon , Do not set to NULL,TODO, test . Loadlcon(NULL,IDI_APPLICATION).
    db.hIconSm = NULL;// Small icons , Do not set to NULL,TODO, test .
    db.hInstance = hInstance;// Current function real column handle ,hinstance.
    db.lpfnWndProc = ;// Callback function address .WinProc.
    db.lpszClassName = "elsfang_kuai";// Don't repeat the name .//"NumRain", The identification of the window , For the system .
    db.lpszMenuName = NULL;// The name of the menu , nothing NULL, The name of the directory resource is the same . If you use integer id Show menu , It can be used MAKEINTRESOURCE Define a macro .
    db.style = CS_HREDRAW | CS_VREDRAW;// Style of window class , Its value can be any combination of window style values .CS_HREDRAW|CS_VREDRAW, This is a vertical refresh and horizontal refresh , Window size changes , Redraw active area .
    //12 Members cannot write more or less , Otherwise, the creation of windows will fail .
    // Warning C4133“ = ”: from “char[13]” To “LPCWSTR” Incompatible type for . The solution will attribute -> senior -> Character set ( from Unicode Change character set to multi byte character set ).    
    return 0;
}