通过特定获取获取电脑外网IP地址

void  get_WanIp()
{

    char Buf_File_Read[MAX_PATH] = {};
    char IP_Temp[];
    char IP_Host[];
    int Result_URLDownloadToFile = ;
    char szFilePath[MAX_PATH] = {};
    GetTempPathA(MAX_PATH,szFilePath);
    strcat(szFilePath,"IPinTheWorld.ini");

    Result_URLDownloadToFile = URLDownloadToFileA(,"http://ip.dnsexit.com/index.php",szFilePath,,NULL);
    if(Result_URLDownloadToFile != )//若URLDownloadToFile()成功，返回0
    {
        MessageBox(NULL, "网络故障，无法接入Internet，请联系网络管理员","提示",MB_ICONASTERISK);
        return ;
    }  

    FILE *fp_Download_URL_File=NULL;
    if ((fp_Download_URL_File=fopen( szFilePath,"r")) == NULL)
    {
        MessageBox(NULL, "系统故障，无法打开IP文件，请检查防火墙设置或联系管理人员","提示",MB_ICONASTERISK);
        return ;
    }  

    if ( fp_Download_URL_File != NULL )
    {
        fseek(fp_Download_URL_File, , SEEK_SET);
        fread(Buf_File_Read,,,fp_Download_URL_File);
        fclose(fp_Download_URL_File);
        DeleteFile(szFilePath);
    }
    strcpy(g_szWanIp,Buf_File_Read);
}