#include<Windows.h>
//#include<WinBase.h>
//#include<iostream>

int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nShowCmd) {
MessageBox(NULL, TEXT("内容"), TEXT("标题"), MB_OK); return 0; }

非常简单，但是总是出错