我不明白我在这个编程代码中得到的错误 [英] I don't understand the error i get in this programming code
问题描述
我一直得到这个错误，我使用VS 2013.我下载了MUD ROM 2.4b6的源代码，当我去编译这是我得到的。
错误5错误C2109：表达式必须是指向完整对象类型的指针
spec_table in：
fun == spec_table [cmd] .function
这是它给我的问题的代码。我完全不知道在哪里？ Btw spec_table是在代码最顶部的同一个文件上定义的。
/ * OLC已插入* /
/ ******** **************************************************** *******************
名称：spec_string
目的：给定一个函数，返回相应的名称。
Called by：< ???>
********************************************** ****************************** /
char * spec_string（SPEC_FUN * fun）/ * OLC * /
{
int cmd;
for（cmd = 0; spec_table [cmd] .function [0]！='\0'; cmd ++）
if（fun == spec_table [cmd] .function）
return spec_table [cmd] .name;
return 0;
}
spec_table定义在文件的最顶部，只是一个代码段，因为整个事情太大了。
const struct spec_type spec_table [] =
{
{spec_breath_any，spec_breath_any}，
{spec_breath_acid，spec_breath_acid}，
{spec_breath_fire，spec_breath_fire}，
{spec_breath_frost，spec_breath_frost}，
{spec_breath_gas，spec_breath_gas}，
{spec_breath_lightning，spec_breath_lightning}，
是头文件中spec_type的声明。
struct spec_type
{
char * name; / *特殊函数名* /
SPEC_FUN *函数; / *函数* /
};
这是SPEC_FUN的声明
typedef bool SPEC_FUN args（（CHAR_DATA * ch））;
这是CHAR_DATA的声明
struct char_data
{
CHAR_DATA * next;
CHAR_DATA * next_in_room;
CHAR_DATA * master;
CHAR_DATA * leader;
CHAR_DATA * fighting;
CHAR_DATA * reply;
CHAR_DATA * pet;
MEM_DATA * memory;
SPEC_FUN * spec_fun;
MOB_INDEX_DATA * pIndexData;
DESCRIPTOR_DATA * desc;
AFFECT_DATA *受影响;
NOTE_DATA * pnote;
OBJ_DATA * carry;
OBJ_DATA * on;
ROOM_INDEX_DATA * in_room;
ROOM_INDEX_DATA * was_in_room;
AREA_DATA * zone;
PC_DATA * pcdata;
GEN_DATA * gen_data;
bool valid;
char * name;
long id;
sh_int version;
char * short_descr;
char * long_descr;
char * description;
char * prompt;
char * prefix;
sh_int group;
sh_int clan;
sh_int sex;
sh_int class;
sh_int race;
sh_int level;
sh_int trust;
int play;
int lines; / * for pager * /
time_t logon;
sh_int timer;
sh_int wait;
sh_int daze;
sh_int hit;
sh_int max_hit;
sh_int mana;
sh_int max_mana;
sh_int move;
sh_int max_move;
long gold;
long silver;
int exp
long act
long comm; / * RT添加到pad向量* /
long wiznet; / * wiz stuff * /
long imm_flags;
long res_flags;
long vuln_flags;
sh_int invis_level;
sh_int incog_level;
long affected_by;
sh_int position;
sh_int practice;
sh_int train;
sh_int carry_weight;
sh_int carry_number;
sh_int saving_throw;
sh_int alignment;
sh_int hitroll;
sh_int damroll;
sh_int armor [4];
sh_int wimpy;
/ * stats * /
sh_int perm_stat [MAX_STATS];
sh_int mod_stat [MAX_STATS];
/ * parts stuff * /
long form;
长零件;
sh_int size;
char * material;
/ * mobile stuff * /
long off_flags;
sh_int damage [3];
sh_int dam_type;
sh_int start_pos;
sh_int default_pos;
};
现在我们有了我们需要的代码...
struct spec_type
{
char * name; / *特殊函数名* /
SPEC_FUN *函数; / *函数* /
};
我假设 function 函数指针。你不能索引到一个函数指针，它没有意义，因为这些指针不是一个完整的类型。例如，你不能接受 sizeof 一个函数类型，那么编译器如何知道如何获得下一个元素呢？
这将是错误的; function [0] 永远不会是 char 类型。您是否要检查名称字段是否为空字符？
当索引到指针类型时，真正发生的是这样的：
<$> p $ p>
p [n] = *（p + n）= *（p增加n个字节的大小）
看起来你只是想获得函数的字符串表示。尝试这样：
//你应该返回一个const char *，而不是一个char *
const char * spec_string （SPEC_FUN * fun）/ * OLC * /
{
int cmd;
static const int size = sizeof spec_table / sizeof spec_table [0];
for（cmd = 0; cmd< size; cmd ++）{
if（fun == spec_table [cmd] .function）{
return spec_table [cmd] .name;
}
}
return 0;
}
I keep getting this error, and I am using VS 2013. I downloaded the source code for MUD ROM 2.4b6 and when i go to compile this is what i get.
Error 5 error C2109: expression must be a pointer to a complete object type
the error is for the spec_table in:
fun == spec_table[cmd].function
and this is the code that its giving me the problem. I have absolutely no idea where to being? Btw spec_table was defined on the same file at the very top of the code. Can anyone please shed some insight?
/* OLC Inserted */
/*****************************************************************************
Name: spec_string
Purpose: Given a function, return the appropriate name.
Called by: <???>
****************************************************************************/
char *spec_string( SPEC_FUN *fun ) /* OLC */
{
int cmd;
for ( cmd = 0; spec_table[cmd].function[0] != '\0'; cmd++ )
if ( fun == spec_table[cmd].function )
return spec_table[cmd].name;
return 0;
}
the spec_table is defined at the very top of the file with this section: It is just a snippet because the whole thing is too large.
const struct spec_type spec_table[] =
{
{ "spec_breath_any", spec_breath_any },
{ "spec_breath_acid", spec_breath_acid },
{ "spec_breath_fire", spec_breath_fire },
{ "spec_breath_frost", spec_breath_frost },
{ "spec_breath_gas", spec_breath_gas },
{ "spec_breath_lightning", spec_breath_lightning },
here is the declaration for spec_type in a header file.
struct spec_type
{
char * name; /* special function name */
SPEC_FUN * function; /* the function */
};
this is the declaration for SPEC_FUN
typedef bool SPEC_FUN args( ( CHAR_DATA *ch ) );
this is the declaration for CHAR_DATA
struct char_data
{
CHAR_DATA * next;
CHAR_DATA * next_in_room;
CHAR_DATA * master;
CHAR_DATA * leader;
CHAR_DATA * fighting;
CHAR_DATA * reply;
CHAR_DATA * pet;
MEM_DATA * memory;
SPEC_FUN * spec_fun;
MOB_INDEX_DATA * pIndexData;
DESCRIPTOR_DATA * desc;
AFFECT_DATA * affected;
NOTE_DATA * pnote;
OBJ_DATA * carrying;
OBJ_DATA * on;
ROOM_INDEX_DATA * in_room;
ROOM_INDEX_DATA * was_in_room;
AREA_DATA * zone;
PC_DATA * pcdata;
GEN_DATA * gen_data;
bool valid;
char * name;
long id;
sh_int version;
char * short_descr;
char * long_descr;
char * description;
char * prompt;
char * prefix;
sh_int group;
sh_int clan;
sh_int sex;
sh_int class;
sh_int race;
sh_int level;
sh_int trust;
int played;
int lines; /* for the pager */
time_t logon;
sh_int timer;
sh_int wait;
sh_int daze;
sh_int hit;
sh_int max_hit;
sh_int mana;
sh_int max_mana;
sh_int move;
sh_int max_move;
long gold;
long silver;
int exp;
long act;
long comm; /* RT added to pad the vector */
long wiznet; /* wiz stuff */
long imm_flags;
long res_flags;
long vuln_flags;
sh_int invis_level;
sh_int incog_level;
long affected_by;
sh_int position;
sh_int practice;
sh_int train;
sh_int carry_weight;
sh_int carry_number;
sh_int saving_throw;
sh_int alignment;
sh_int hitroll;
sh_int damroll;
sh_int armor[4];
sh_int wimpy;
/* stats */
sh_int perm_stat[MAX_STATS];
sh_int mod_stat[MAX_STATS];
/* parts stuff */
long form;
long parts;
sh_int size;
char* material;
/* mobile stuff */
long off_flags;
sh_int damage[3];
sh_int dam_type;
sh_int start_pos;
sh_int default_pos;
};
Now that we have the code we need...
struct spec_type
{
char * name; /* special function name */
SPEC_FUN * function; /* the function */
};
I'm assuming that function is a function pointer. You cannot index into a function pointer, it makes no sense because these pointers do not poijnt to a complete type. For example, you cannot take the sizeof a function type, so how would the compiler know how to get to the next element?
It would be wrong anyway; function[0] would never be of the type char. Did you mean to check the name field for a null character? That would make more sense.
When you index into a pointer type, what's really going on is this:
p[n] = *(p + n) = *(p incremented by sizeof n bytes)
It looks like you're just trying to get the string representation of the function. Try this:
// you should be returning a const char*, not a char*
const char *spec_string( SPEC_FUN *fun ) /* OLC */
{
int cmd;
static const int size = sizeof spec_table / sizeof spec_table[0];
for (cmd = 0; cmd < size; cmd++) {
if (fun == spec_table[cmd].function) {
return spec_table[cmd].name;
}
}
return 0;
}
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