[問題] typedef enum 的 void* 用法請益

看板C_and_CPP作者remember11 (Mr.Darcy)時間10年前 (2013/08/26 19:01)推噓3(3推 0噓 4→)

留言7則, 4人參與討論串1/3 (看更多)

開發平台(Platform): (Ex: VC++, GCC, Linux, ...) G++ 額外使用到的函數庫(Library Used): (Ex: OpenGL, ...) 問題(Question)：小弟將一段 .c 的code貼到 .cpp上，用 g++ compiler 產上下述錯誤結果 (錯誤的程式在程式碼內兩行標記處 //error) 不知道為什麼c++ 這樣用 void* 會有錯煩請各位大大指點，該如何改正? 謝謝錯誤結果(Wrong Output)： player.cpp:25: error: invalid cast from type 'void*' to type 'eGOPLAYER_STATE' player.cpp:27: error: invalid cast from type 'void*' to type 'eGOPLAYER_STATE' 程式碼(Code)：(請善用置底文網頁, 記得排版) #include <stdio.h> #include <string.h> #include <stdlib.h> #include <errno.h> #include <sys/types.h> #include <sys/msg.h> #include <sys/stat.h> #include <malloc.h> #include <unistd.h> typedef enum { eGOPLAYER_STATE_STOP, eGOPLAYER_STATE_PLAY, eGOPLAYER_STATE_PAUSE }eGOPLAYER_STATE; typedef void(* GOPLAYER_STREAM_CALLBACK)(eGOPLAYER_CALLBACK_TYPE type, void *data); void cb_func(eGOPLAYER_CALLBACK_TYPE type, void *data) { switch (type) { case eGOPLAYER_CBT_STATE_CHANGE: { if((eGOPLAYER_STATE)data == eGOPLAYER_STATE_PAUSE) //error printf("[sample]state : pause\n"); else if ((eGOPLAYER_STATE)data == eGOPLAYER_STATE_PLAY){ //error printf("[sample]state : play\n"); } else printf("[sample]state : stop\n"); } break; default: break; } } int player_open_mms(char *uri) { player_open(cb_func); player_set_source_uri(uri, 0); player_close(); return 0; } -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 59.120.184.171 ※ remember11:轉錄至看板 Programming 08/26 19:03

推

purpose

08/26 19:19, , 1^F

08/26 19:19, 1^F

→

purpose

08/26 19:20, , 2^F

08/26 19:20, 2^F

謝謝不過這樣改似乎就失去callback的意義喔?

推

CaptainH

08/26 19:31, , 3^F