win32做API的时候出错了，哪位大神帮忙改一下，或者说一下

#include <Windows.h>
#include <tchar.h>
LRESULT CALLBACK WndProc(HWND hWnd,UINT msg,WPARAM wParam,LPARAM mParam);
const TCHAR szWindowClass[]=L"第一个窗口";
const TCHAR szWindowTitle[]=L"主窗口题目";
int WINAPI_tWinMain(HINSTANCE hInstance,HINSTANCE hPreInstance,LPTSTR lpCmdLine,int nCmdShow)
{
    WNDCLASSEX wcex={ 0 };
    wcex.cbSize=sizeof(WNDCLASSEX);
    wcex.style=CS_HREDRAW|CS_VREDRAW;
    wcex.lpfnWndProc=(WNDPROC)WndProc;
    wcex.hInstance=hInstance;
    wcex.hIcon=LoadIcon(NULL,IDI_APPLICATION);
    wcex.hCursor=LoadCursor(NULL,IDC_ARROW);
    wcex.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
    wcex.lpszClassName=szWindowClass;
    RegisterClassEx(&wcex);
    HWND hWnd=CreateWindow(szWindowClass,
        szWindowTitle,
        WS_OVERLAPPEDWINDOW,
        100,200,500,500,
        HWND_DESKTOP,
        NULL,
        hInstance,
        NULL);
    if(!hWnd)
        return FALSE;
    ShowWindow( hWnd,nCmdShow);
    UpdateWindow(hWnd);
    MSG msg;
    while(GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hWnd,UINT msg,WPARAM wParam,LPARAM lParam)
{
    switch(msg)
    {
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    default:
        return DefWindowProc(hWnd,msg,wParam,lParam);
    }
}
————————————————————————————————————————————————————————————————————————————错误：
错误 1 error LNK2019: 无法解析的外部符号 _main，该符号在函数 ___tmainCRTStartup 中被引用    E:\Games\00320\00320\MSVCRTD.lib(crtexe.obj)    00320