将 PJSUA（或 PJSUA2）构建为 DLL 的链接器错误 Visual Studio 2015

Question

我正在尝试将 PJSUA（并尝试使用 PJSUA2）构建为 Visual Studio 2015 的 DLL。

该项目正确构建 .lib 文件，但更改设置以构建 .dll 时会收到有关未解析的外部符号的错误消息。

我已尝试使用此处描述的解决方案 >>How to build PJSIP as DLL in Visual Studio<< 但我收到以下错误消息：

1>LINK : error LNK2001: unresolved external symbol _pjmedia_tonegen_create2
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pj_time_val_normalize
1>pjsua_acc.obj : error LNK2001: unresolved external symbol _pj_time_val_normalize
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pj_time_val_normalize
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_time_val_normalize
1>pjsua_dump.obj : error LNK2001: unresolved external symbol _pj_time_val_normalize
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pj_list_insert_before
1>pjsua_acc.obj : error LNK2001: unresolved external symbol _pj_list_insert_before
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pj_list_insert_before
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_list_insert_before
1>pjsua_im.obj : error LNK2001: unresolved external symbol _pj_list_insert_before
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_list_insert_after referenced in function _pj_list_push_front
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_list_merge_first referenced in function _pjsua_acc_modify
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_list_merge_last referenced in function _pjsua_acc_modify
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_list_erase referenced in function _pjsua_acc_modify
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pj_list_erase
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_list_erase
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pj_list_erase
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_list_size referenced in function _pjsua_acc_modify
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_hdr_clone referenced in function _pjsua_acc_config_dup
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pjsip_hdr_clone
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pjsip_hdr_clone
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_hdr_shallow_clone referenced in function _pjsua_acc_modify
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_hdr_print_on referenced in function _pjsip_hdr_cmp
1>pjsua_dump.obj : error LNK2001: unresolved external symbol _pjsip_hdr_print_on
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_get_status_text referenced in function _pjsua_acc_get_info
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pjsip_get_status_text
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_msg_find_hdr referenced in function _pjsua_acc_create_uas_contact
1>pjsua_im.obj : error LNK2001: unresolved external symbol _pjsip_msg_find_hdr
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pjsip_msg_find_hdr
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_msg_find_hdr_by_name referenced in function _update_service_route
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pjsip_msg_find_hdr_by_name
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pjsip_msg_find_hdr_by_name
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_generic_string_hdr_create referenced in function _pjsua_regc_init
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pjsip_generic_string_hdr_create
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pjsip_generic_string_hdr_create
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_route_hdr_create referenced in function _update_service_route
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_supported_hdr_create referenced in function _pjsua_regc_init
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_parse_uri referenced in function _pjsua_acc_modify
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pjsip_parse_uri
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pjsip_parse_uri
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pjsip_parse_uri
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_parse_hdr referenced in function _pjsua_acc_modify
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pjsip_parse_hdr
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_parser_const referenced in function _initialize_acc
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pjsip_parser_const
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_AF_UNSPEC referenced in function _pjsua_acc_get_uac_addr
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_AF_UNSPEC
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_AF_INET referenced in function _get_ip_addr_ver
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_AF_INET
1>pjsua_media.obj : error LNK2001: unresolved external symbol _pj_AF_INET
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_AF_INET6 referenced in function _pjsua_acc_get_uac_addr
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_AF_INET6
1>pjsua_media.obj : error LNK2001: unresolved external symbol _pj_AF_INET6
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_inet_pton referenced in function _get_ip_addr_ver
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_sockaddr_cmp referenced in function _acc_check_nat_addr
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pj_sockaddr_cmp
1>pjsua_media.obj : error LNK2001: unresolved external symbol _pj_sockaddr_cmp
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_sockaddr_get_len referenced in function _pjsua_acc_get_uac_addr
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_sockaddr_get_len
1>pjsua_media.obj : error LNK2001: unresolved external symbol _pj_sockaddr_get_len
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_sockaddr_set_port referenced in function _pjsua_acc_get_uac_addr
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_sockaddr_set_port
1>pjsua_media.obj : error LNK2001: unresolved external symbol _pj_sockaddr_set_port
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_sockaddr_parse referenced in function _acc_check_nat_addr
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_gethostname referenced in function _initialize_acc
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_gethostname
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_transport_get_type_from_name referenced in function _pjsua_acc_create_uas_contact
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_transport_get_flag_from_type referenced in function _pjsua_acc_create_uas_contact
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pjsip_transport_get_flag_from_type
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_transport_get_default_port_for_type referenced in function _acc_check_nat_addr
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_transport_get_type_name referenced in function _pjsua_acc_add_local
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_tx_data_set_transport referenced in function _pjsua_acc_create_request
1>pjsua_im.obj : error LNK2001: unresolved external symbol _pjsip_tx_data_set_transport
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_transport_shutdown referenced in function _pjsua_acc_on_tp_state_changed
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pjsip_transport_shutdown
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_transport_add_ref referenced in function _pjsua_acc_modify
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_transport_dec_ref referenced in function _pjsua_acc_del
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_tpmgr_fla2_param_default referenced in function _pjsua_acc_create_uas_contact
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_tpmgr_find_local_addr2 referenced in function _pjsua_acc_create_uas_contact
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_tpmgr_send_raw referenced in function _keep_alive_timer_cb
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_endpt_schedule_timer referenced in function _keep_alive_timer_cb
1>pjsua_aud.obj : error LNK2001: unresolved external symbol _pjsip_endpt_schedule_timer
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pjsip_endpt_schedule_timer
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pjsip_endpt_schedule_timer
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_endpt_cancel_timer referenced in function _pjsua_acc_del
1>pjsua_aud.obj : error LNK2001: unresolved external symbol _pjsip_endpt_cancel_timer
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pjsip_endpt_cancel_timer
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pjsip_endpt_cancel_timer
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_endpt_get_tpmgr referenced in function _pjsua_acc_create_uas_contact
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pjsip_endpt_get_tpmgr
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_endpt_acquire_transport2 referenced in function _pjsua_acc_get_uac_addr
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_endpt_create_request referenced in function _pjsua_acc_create_request
1>pjsua_im.obj : error LNK2001: unresolved external symbol _pjsip_endpt_create_request
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_get_dest_info referenced in function _pjsua_acc_get_uac_addr
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pj_pool_release
1>pjsua_acc.obj : error LNK2001: unresolved external symbol _pj_pool_release
1>pjsua_aud.obj : error LNK2001: unresolved external symbol _pj_pool_release
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pj_pool_release
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_pool_release
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_pool_reset referenced in function _pjsua_acc_add
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pj_pool_reset
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pj_pool_alloc
1>pjsua_acc.obj : error LNK2001: unresolved external symbol _pj_pool_alloc
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_pool_alloc
1>pjsua_im.obj : error LNK2001: unresolved external symbol _pj_pool_alloc
1>pjsua_media.obj : error LNK2001: unresolved external symbol _pj_pool_alloc
1>pjsua_im.obj : error LNK2001: unresolved external symbol _pj_str
1>pjsua_media.obj : error LNK2001: unresolved external symbol _pj_str
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pj_str
1>pjsua_acc.obj : error LNK2001: unresolved external symbol _pj_str
1>pjsua_aud.obj : error LNK2001: unresolved external symbol _pj_str
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pj_str
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_str
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_strcpy referenced in function _initialize_acc
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_strdup referenced in function _pjsua_acc_config_dup
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pj_strdup
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_strdup
1>pjsua_media.obj : error LNK2001: unresolved external symbol _pj_strdup
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pj_strdup_with_null
1>pjsua_acc.obj : error LNK2001: unresolved external symbol _pj_strdup_with_null
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pj_strdup_with_null
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_strdup_with_null
1>pjsua_im.obj : error LNK2001: unresolved external symbol _pj_strdup_with_null
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_strdup2 referenced in function _initialize_acc
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_strdup2_with_null referenced in function _acc_check_nat_addr
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_strcmp referenced in function _pjsua_acc_modify
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_strcmp
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_strncmp referenced in function _is_private_ip
1>pjsua_media.obj : error LNK2001: unresolved external symbol _pj_stricmp
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pj_stricmp
1>pjsua_acc.obj : error LNK2001: unresolved external symbol _pj_stricmp
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pj_stricmp
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_stricmp
1>pjsua_im.obj : error LNK2001: unresolved external symbol _pj_stricmp
1>pjsua_media.obj : error LNK2001: unresolved external symbol _pj_stricmp2
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pj_stricmp2
1>pjsua_acc.obj : error LNK2001: unresolved external symbol _pj_stricmp2
1>pjsua_aud.obj : error LNK2001: unresolved external symbol _pj_stricmp2
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pj_stricmp2
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_stricmp2
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_strcat referenced in function _update_regc_contact
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_strcat2 referenced in function _initialize_acc
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pj_stristr referenced in function _update_regc_contact
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pj_stristr
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_stristr
1>pjsua_media.obj : error LNK2001: unresolved external symbol _pj_stristr
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_authorization_hdr_create referenced in function _pjsua_acc_set_registration
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_auth_clt_pref_dup referenced in function _pjsua_acc_config_dup
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_cred_info_dup referenced in function _pjsua_acc_config_dup
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pjsip_cred_info_dup
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_cred_info_cmp referenced in function _pjsua_acc_modify
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_rdata_get_tsx referenced in function _update_keep_alive
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pjsip_rdata_get_tsx
1>pjsua_im.obj : error LNK2001: unresolved external symbol _pjsip_rdata_get_tsx
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pjsip_rdata_get_tsx
1>pjsua_media.obj : error LNK2001: unresolved external symbol _pj_thread_this
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pj_thread_this
1>pjsua_acc.obj : error LNK2001: unresolved external symbol _pj_thread_this
1>pjsua_aud.obj : error LNK2001: unresolved external symbol _pj_thread_this
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pj_thread_this
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_thread_this
1>pjsua_media.obj : error LNK2001: unresolved external symbol _pj_mutex_lock
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pj_mutex_lock
1>pjsua_acc.obj : error LNK2001: unresolved external symbol _pj_mutex_lock
1>pjsua_aud.obj : error LNK2001: unresolved external symbol _pj_mutex_lock
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pj_mutex_lock
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_mutex_lock
1>pjsua_media.obj : error LNK2001: unresolved external symbol _pj_mutex_unlock
1>pjsua_pres.obj : error LNK2001: unresolved external symbol _pj_mutex_unlock
1>pjsua_acc.obj : error LNK2001: unresolved external symbol _pj_mutex_unlock
1>pjsua_aud.obj : error LNK2001: unresolved external symbol _pj_mutex_unlock
1>pjsua_call.obj : error LNK2001: unresolved external symbol _pj_mutex_unlock
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pj_mutex_unlock
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_regc_create referenced in function _pjsua_regc_init
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_regc_destroy referenced in function _pjsua_acc_del
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_regc_get_info referenced in function _pjsua_acc_get_info
1>pjsua_core.obj : error LNK2001: unresolved external symbol _pjsip_regc_get_info
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_regc_init referenced in function _pjsua_regc_init
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_regc_set_reg_tsx_cb referenced in function _pjsua_regc_init
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_regc_set_via_sent_by referenced in function _pjsua_acc_modify
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_regc_set_delay_before_refresh referenced in function _pjsua_acc_modify
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_regc_set_credentials referenced in function _pjsua_regc_init
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_regc_set_prefs referenced in function _pjsua_regc_init
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_regc_set_route_set referenced in function _pjsua_regc_init
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_regc_set_transport referenced in function _pjsua_regc_init
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_regc_release_transport referenced in function _pjsua_acc_on_tp_state_changed
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_regc_add_headers referenced in function _pjsua_regc_init
1>pjsua_acc.obj : error LNK2019: unresolved external symbol _pjsip_regc_register referenced in function _pjsua_acc_set_registration
.... and much more of similar errors

有人知道我为什么会收到这些错误吗？

Answer 1

我已经成功构建了 DLL。

我就是这么做的：

1. 下载了一个干净的 PJSIP 项目（pjproject-2.7.1.zip）。
2. 在 Visual Studio 2015 年打开了 pjproject-vs14.sln 文件。
3. 将 pjsua 设为我的默认项目。
4. 构建了整个项目。
5. 将 pjsua_lib 作为我的默认项目。
6. 按照本主题 How to build pjsip as DLL in Visual studio? 中的步骤为 PJSUA 的发布版本构建 DLL，但对于构​​建我选择了构建 pjsua_lib，而不是构建解决方案。
7. 将解决方案配置更改为调试动态。
8. 检查 PJSUA 项目的属性是否没有改变（对我来说，它们改变了，所以我应用了 link.
中的步骤
9. 将 PJSUA 干净地构建为带有调试信息的 DLL（也构建 pjsua_lib，而不是构建解决方案）。

为了构建 PJSUA2，我需要更改 PJSUA 项目属性，以便它再次构建为静态库 (.lib)。 切换到 pjsua2_lib 作为启动项目并执行与 pjsua_lib 相同的其余步骤，但还添加了对 pjsua_lib 项目的引用。

编辑： 我的 config_site.h 文件：

#pragma once

#   define PJ_DLL  1
#   define PJ_EXPORTING 1
#   define PJ_EXPORT_SPECIFIER  __declspec(dllexport)
#   define PJ_IMPORT_SPECIFIER  __declspec(dllimport)
#   define PJ_HAS_TCP 1

#   define PJ_SCANNER_USE_BITWISE   0
#   undef PJ_OS_HAS_CHECK_STACK
#   define PJ_OS_HAS_CHECK_STACK    0
#   define PJ_LOG_MAX_LEVEL     3
#   define PJ_ENABLE_EXTRA_CHECK    0
#   define PJ_IOQUEUE_MAX_HANDLES   5000
#   define PJSIP_MAX_TSX_COUNT      ((640*1024)-1)
#   define PJSIP_MAX_DIALOG_COUNT   ((640*1024)-1)
#   define PJSIP_UDP_SO_SNDBUF_SIZE (24*1024*1024)
#   define PJSIP_UDP_SO_RCVBUF_SIZE (24*1024*1024)
#   define PJ_DEBUG         0
#   define PJSIP_SAFE_MODULE        0
#   define PJ_HAS_STRICMP_ALNUM     0
#   define PJSIP_UNESCAPE_IN_PLACE  1

#   if defined(PJ_WIN32) || defined(PJ_WIN64) 
#     define PJSIP_MAX_NET_EVENTS   10
#   endif

#   define PJSUA_MAX_CALLS      512

Link 到已编译的 dll：PJSUA2 & PJSUA dll's