Lỗi LNK2019 khi chạy code trên VS

[tuan_anh12 (Tuan Anh)]

Mình là newbie ai giúp mình sửa cái lỗi này với
Severity Code Description Project File Line Suppression State
Error LNK2019 unresolved external symbol WinMain referenced in function “int __cdecl invoke_main(void)” (?invoke_main@@YAHXZ) test C:\Users\Administrator\source\repos\test\test\MSVCRTD.lib(exe_winmain.obj) 1

#include <windows.h>
#include <cstdio>

struct monster
{
	char unk[0x710];
	bool is_valid()
	{
		return (bool)unk[0x304];
	}
	//0x3E
	short get_id()
	{
		return *(short*)(&unk[0x3E]);
	}
};
const auto constructor = (void(__fastcall*)(void* buffer, int C1, int packetId))0xAC6C39;
const auto append_to_packet = (void(__fastcall*)(void* buffer, char byte))0x439105;
const auto data_send = (void(__fastcall*)(void* buffer, int zero1, int zero2))0xAC7035;
const auto get_singleton = (void* (*)())0x437080;
const auto get_by_id = (monster&(__fastcall*)(void* singleton, int id))0x957EFC;

void Autokill()
{
	while (1)
	{
		if (GetAsyncKeyState(VK_F1))
		{
			void* singleton = get_singleton();
			for (int i = 0; i < 400; ++i)
			{
				monster& current_monster = get_by_id(singleton, i);
				if (!current_monster.is_valid())
					continue;
				short current_id = current_monster.get_id();
				if ((current_id >> 8) > 0x20)
				{
					printf("We have found a high id object, it is player most porbably!\n");
						continue;
				}
				char packet_buffer[0x2000];
				constructor(packet_buffer, 0xC1, 0X11);
				append_to_packet(packet_buffer, current_id >> 8);
				append_to_packet(packet_buffer, current_id & 0xFF);
				append_to_packet(packet_buffer, 0x78);
				append_to_packet(packet_buffer, 0x10);
				data_send(packet_buffer, 0, 0);
				printf("we have attacked a monster with id %d", (int)current_id);
			}
			Sleep(500);
		}
	}
}

DWORD WINAPI DllMain(HINSTANCE hInst, DWORD reason, LPVOID q)
{
	switch (reason)
	{
	case DLL_PROCESS_ATTACH:
		AllocConsole();
		freopen("$CONOUT", "w", stdout);
		printf("Loaded!\n");
		break;
	}
	return 1;
}