结构体命名时加了下划线

举例:

typedef struct _ssidCfg_
{
unsigned char ret; 
unsigned char scanSsid;
unsigned char priority; 
unsigned char encryption; 
unsigned char ssid[32];
unsigned char passwd[32];
}ssidCfg, *pSsidCfg;

加了下划线的命名只是为了说明此结构体变量是基本的那个变量，只是为了和后面没有加下划线的做区别而已