“错误LNK2001:未解析的外部符号”

Question

我在VC++ 2008中的程序有问题。当我编译它时，列出了以下错误。我花了很多时间在groups.google.com上寻找原因，但没有任何评论对我有帮助。有人知道问题出在哪里吗？谢谢。

error LNK2001: unresolved external symbol "long rfl_xref_id" (?rfl_xref_id@@3JA)
error LNK2001: unresolved external symbol "struct obj_name * pat_objname_list" (?pat_objname_list@@3PAUobj_name@@A)
error LNK2001: unresolved external symbol "struct obj_name * pat_recall_objname_list" (?pat_recall_objname_list@@3PAUobj_name@@A)
error LNK2001: unresolved external symbol "wchar_t * rfl_unresolved_xref_tag" (?rfl_unresolved_xref_tag@@3PA_WA)
error LNK2001: unresolved external symbol "struct ref_pages * rfl_pages" (?rfl_pages@@3PAUref_pages@@A)
error LNK2001: unresolved external symbol "short rfl_use_regen_id" (?rfl_use_regen_id@@3FA)
error LNK2001: unresolved external symbol "long rfl_regen_id" (?rfl_regen_id@@3JA)
error LNK2001: unresolved external symbol "unsigned short rfl_list_status" (?rfl_list_status@@3GA)
error LNK2001: unresolved external symbol "unsigned short rfl_inst_hdr_page" (?rfl_inst_hdr_page@@3GA)
error LNK2001: unresolved external symbol "unsigned short rfl_inst_hdr_ptr" (?rfl_inst_hdr_ptr@@3GA)
error LNK2001: unresolved external symbol "unsigned short rfl_inst_obj" (?rfl_inst_obj@@3GA)
error LNK2001: unresolved external symbol "short rfl_instance_level" (?rfl_instance_level@@3FA)
error LNK2001: unresolved external symbol "short rfl_access_mode" (?rfl_access_mode@@3FA)
error LNK2001: unresolved external symbol "long rfl_select_ref_offset" (?rfl_select_ref_offset@@3JA)
error LNK2001: unresolved external symbol "long rfl_edit_ref_id" (?rfl_edit_ref_id@@3JA)
error LNK2001: unresolved external symbol "long rfl_add_att_offset" (?rfl_add_att_offset@@3JA)
error LNK2001: unresolved external symbol "short rfl_adding_ent_data" (?rfl_adding_ent_data@@3FA)
error LNK2001: unresolved external symbol "long rfl_xref_def_inst_ukey" (?rfl_xref_def_inst_ukey@@3JA)
error LNK2001: unresolved external symbol "long rfl_xref_def_ukey" (?rfl_xref_def_ukey@@3JA)
error LNK2001: unresolved external symbol "long rfl_instance_ukey" (?rfl_instance_ukey@@3JA)
error LNK2001: unresolved external symbol "long rfl_ref_id" (?rfl_ref_id@@3JA)
error LNK2001: unresolved external symbol "unsigned short rfl_next_page_num" (?rfl_next_page_num@@3GA)
error LNK2001: unresolved external symbol "unsigned short rfl_num_pages" (?rfl_num_pages@@3GA)
error LNK2001: unresolved external symbol "unsigned short rfl_page_size" (?rfl_page_size@@3GA)
error LNK2001: unresolved external symbol "struct ref_pages * rfl_cur_page" (?rfl_cur_page@@3PAUref_pages@@A)
error LNK2001: unresolved external symbol "struct ref_def_map * rfl_recall_map" (?rfl_recall_map@@3PAUref_def_map@@A)
error LNK2001: unresolved external symbol "struct ref_xref_image * rfl_image_list" (?rfl_image_list@@3PAUref_xref_image@@A)
error LNK2001: unresolved external symbol "struct ref_xref_refresh * rfl_refresh_info" (?rfl_refresh_info@@3PAUref_xref_refresh@@A)
error LNK2001: unresolved external symbol "short * rfl_form_status" (?rfl_form_status@@3PAFA)
error LNK2001: unresolved external symbol "short rfl_num_forms" (?rfl_num_forms@@3FA)
error LNK2001: unresolved external symbol "long rfl_recall_start_id" (?rfl_recall_start_id@@3JA)
error LNK2001: unresolved external symbol "long rfl_recall_end_id" (?rfl_recall_end_id@@3JA)
error LNK2001: unresolved external symbol "struct ref_pages rfl_begin_add_page" (?rfl_begin_add_page@@3Uref_pages@@A)
error LNK2001: unresolved external symbol "long rfl_add_length" (?rfl_add_length@@3JA)
error LNK2001: unresolved external symbol "struct ref_pages rfl_found_page" (?rfl_found_page@@3Uref_pages@@A)
error LNK2001: unresolved external symbol "short rfl_scan_status" (?rfl_scan_status@@3FA)
error LNK2001: unresolved external symbol "struct ref_pages rfl_scan_info" (?rfl_scan_info@@3Uref_pages@@A)
error LNK2001: unresolved external symbol "struct ref_recall_xrefs * rfl_xref_list" (?rfl_xref_list@@3PAUref_recall_xrefs@@A)
error LNK2001: unresolved external symbol "struct ref_xref_image * rfl_recall_image_list" (?rfl_recall_image_list@@3PAUref_xref_image@@A)
error LNK2001: unresolved external symbol "struct ref_xref_image * rfl_found_image" (?rfl_found_image@@3PAUref_xref_image@@A)

我已经包含了包含上述所有外部符号定义的"intdef.h“文件。Intdef.h包含：

extern struct ref_pages *rfl_pages;
extern struct ref_pages *rfl_cur_page;
extern struct ref_pages rfl_begin_add_page;
extern struct ref_pages rfl_scan_info;
extern struct ref_pages rfl_found_page;
extern struct ref_def_map *rfl_recall_map;
extern struct ref_select_info *rfl_select;
extern struct ref_recall_xrefs *rfl_xref_list;
extern struct ref_xref_image *rfl_image_list;
extern struct ref_xref_image *rfl_found_image;
extern struct ref_xref_image *rfl_recall_image_list;
extern struct ref_xref_refresh *rfl_refresh_info;
extern unsigned short rfl_page_size;
extern unsigned short rfl_num_pages;
extern unsigned short rfl_next_page_num;
extern unsigned short rfl_inst_obj;
extern unsigned short rfl_inst_hdr_ptr;
extern unsigned short rfl_inst_hdr_page;
extern unsigned short rfl_list_status;
extern short rfl_adding_ent_data;
extern short rfl_scan_status;
extern short rfl_access_mode;
extern short rfl_instance_level;
extern short rfl_redraw_layer;
extern long rfl_add_length;
extern long rfl_ref_id;
extern long rfl_edit_ref_id;
extern long rfl_recall_start_id;
extern long rfl_recall_end_id;
extern long rfl_import_ref_id;
extern long rfl_import_xref_id;
extern long rfl_xref_id;
extern long rfl_instance_ukey;
extern long rfl_xref_def_ukey;
extern long rfl_xref_def_inst_ukey;
extern long rfl_add_att_offset;
extern long rfl_select_ref_offset;
extern long rfl_regen_id;
extern double *rfl_extents;
extern _TCHAR **rfl_ref_names;
extern short rfl_use_regen_id;
extern short rfl_ref_cntr;
extern short rfl_num_forms;
extern short *rfl_form_status;
extern _TCHAR *rfl_xref_fpath;
extern _TCHAR *rfl_xref_name;
extern _TCHAR *rfl_xref_ref_name;
extern _TCHAR *rfl_xref_ref_label;
extern _TCHAR *rfl_unresolved_xref_tag;
extern _TCHAR rfl_tran_is_iso;
extern _TCHAR rfl_doing_area;
extern int rfl_nv;
extern double *rfl_ar;
extern short rfl_regen_xref_mode;

Answer 1

我认为问题出在“extern”关键字上。该关键字指定在代码中的其他位置声明这些值。也许您缺少另一个要编译的.c/.cpp文件，该文件包含这些变量的声明。同样，包含这个头文件实际上并没有定义任何变量--它只是要求它们存在于其他地方！

Answer 2

您已经包含了头文件，但没有包含所需的库(这些外部对象的实现)。

这个库是什么？你是从网上(一些开源的)下载的吗？如果是，请在网站上查找.lib文件(库)

Answer 3

我只是想把这篇文章抛给那些将来可能会偶然发现这篇文章的人。

在工作中，我目前正在将项目从vs2010 (或更高版本)升级到vs2012，我在其中一个项目中偶然发现了这个错误。出于某些原因，我决定在链接器-> Input -> additional dependencies中重新排列我的附加依赖项，它修复了我的错误。

我不知道从2010到2012年的链接器发生了什么变化，但显然它需要重新排列我所依赖的.lib。

这可能并不常见，但如果你有这个问题，并且有许多外部依赖项，那么尝试一下就足够简单了:只需将引发此错误的依赖项放在列表的末尾，然后重新构建项目。

希望有一天这能帮助到某个人！祝你编码愉快！