CallBack回调函数

#include "key.h" KEY_ID_TYPEDEF keyVal; KEY_STATE_TYPEDEF keyState; pKeyScanCallBack pKeyScanCBS; //定义一个函数指针变量 void KeyInit() { keyVal=0; keyState=KEY_IDLE; pKeyScanCBS=0; } void KeyScanCBSRegister(pKeyScanCallBack pCBS) { if(pKeyScanCBS==0) { pKeyScanCBS=pCBS; } } void KeyPoll() { printf("Please Enter key value:"); if(scanf("%d",&keyVal)==1) { printf("\r\n"); printf("Please Enter key state:"); if(scanf("%d",&keyState)==1) { if(pKeyScanCBS!=0) { pKeyScanCBS(keyVal,keyState); } } } }