c - 导致崩溃的基本字符串比较

Question

我有这个全局

const char PROTOCOL_SET_WIFI_CONNECTION[]= "setWifi";

//or this one
//#define PROTOCOL_SET_WIFI_CONNECTION "setWifi" 

然后当我尝试比较字符串时，我遇到了很多问题(硬件问题，例如崩溃)

char *header = strtok (incomingData,":");
if (strcmp (header,PROTOCOL_SET_WIFI_CONNECTION ) == 0) 

//做事

1. 我的比较有什么问题(没有这个“如果”一切都很好)
2. 哪个是首选 -define 或 const？ (单片机)

Answer 1

也许是这样

Once the terminating null character of str is found in a call to strtok, all subsequent calls to this function (with a null pointer as the first argument) return a null pointer.

strtok reference

尝试检查错误行之前的字符串是否为 NULL？