宏#定义函数语法得到了“{‘令牌之前的预期表达式”。
宏#定义函数语法得到了“{‘令牌之前的预期表达式”。
提问于 2019-01-18 02:23:35
我使用#define来定义一组参数，以便以后可以在main()中调用定义的名称。然而，我在第1行中得到了"expected expression before '{' token“，我不知道我的语法是否错误。
#define ADV_1M_LEGACY_CONNECTABLE { \
.properties.type = BLE_GAP_ADV_TYPE_CONNECTABLE_SCANNABLE_UNDIRECTED, \
.p_peer_addr = NULL, \
.interval = APP_ADV_INTERVAL, \
.duration = APP_ADV_DURATION, \
.max_adv_evts = 0, \
.channel_mask = 0, \
.filter_policy = BLE_GAP_ADV_FP_ANY, \
.primary_phy = BLE_GAP_PHY_1MBPS, \
.secondary_phy = 0, \
.set_id = 0, \
.scan_req_notification = 0 \
}从评论中得出：
我有一个呼叫功能： m_adv_handle = advertising_init_common(&m_adv_data，ADV_1M_LEGACY_CONNECTABLE)； 在编辑代码之后，在此调用行中，我出现了一个"
expected expression before ')' token“错误。
更新：
typedef struct
{
ble_gap_adv_properties_t properties;
ble_gap_addr_t const *p_peer_addr;
uint32_t interval;
uint16_t duration;
uint8_t max_adv_evts;
ble_gap_ch_mask_t channel_mask;
uint8_t filter_policy;
uint8_t primary_phy;
uint8_t secondary_phy;
uint8_t set_id:4;
uint8_t scan_req_notification:1;
}ble_gap_adv_params_t; //******this being declare in another .h file
#define ADV_1M_LEGACY_CONNECTABLE (ble_gap_adv_params_t) { \
.properties.type = BLE_GAP_ADV_TYPE_CONNECTABLE_SCANNABLE_UNDIRECTED, \
.p_peer_addr = NULL, \
.interval = APP_ADV_INTERVAL, \
.duration = APP_ADV_DURATION, \
.max_adv_evts = 0, \
.channel_mask = 0, \
.filter_policy = BLE_GAP_ADV_FP_ANY, \
.primary_phy = BLE_GAP_PHY_1MBPS, \
.secondary_phy = 0, \
.set_id = 0, \
.scan_req_notification = 0 \
}
static uint8_t advertising_init_common(ble_gap_adv_data_t*
ble_gap_adv_data, ble_gap_adv_params_t adv_params)
{
ret_code_t err_code;
ble_advdata_t advdata;
ble_advdata_t srdata;
uint8_t advHandle;
ble_uuid_t adv_uuids[] = {{LBS_UUID_SERVICE, m_lbs.uuid_type}};`
// Build and set advertising data.
memset(&ble_gap_adv_data->adv_data, 0, sizeof(ble_gap_adv_data->adv_data));
advdata.name_type = BLE_ADVDATA_FULL_NAME;
advdata.include_appearance = true;
advdata.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
memset(&srdata, 0, sizeof(srdata));
srdata.uuids_complete.uuid_cnt = sizeof(adv_uuids) / sizeof(adv_uuids[0]);
srdata.uuids_complete.p_uuids = adv_uuids;
err_code = ble_advdata_encode(&advdata, ble_gap_adv_data->adv_data.p_data, &ble_gap_adv_data->adv_data.len);
APP_ERROR_CHECK(err_code);
err_code = ble_advdata_encode(&srdata, ble_gap_adv_data->scan_rsp_data.p_data, &ble_gap_adv_data->scan_rsp_data.len);
APP_ERROR_CHECK(err_code);
// Set advertising parameters.
err_code = sd_ble_gap_adv_set_configure(&advHandle, ble_gap_adv_data,
&adv_params);
APP_ERROR_CHECK(err_code);
return advHandle;
}
int main()
{
m_adv_handle = advertising_init_common(&m_adv_data,
ADV_1M_LEGACY_CONNECTABLE); //*********here i have "expected expression before ')' token message*******//
}
所以我想知道我又在哪里做错了。能指引我吗？谢谢
回答 2
Stack Overflow用户
回答已采纳
发布于 2019-01-18 02:44:32
Stack Overflow用户
发布于 2019-01-18 07:48:07
这太大了，不能作评论，所以这是个假答案。
这是一个MCVE的近似-有一个重要的问题，当我编译它时，我没有看到你看到的错误。
arm31.cpp
#include <cstdint>
typedef struct
{
uint32_t interval;
uint16_t duration;
uint8_t max_adv_evts;
uint8_t secondary_phy;
} ble_gap_adv_params_t;
typedef struct
{
ble_gap_adv_params_t adv_params;
uint16_t adv_program;
} ble_gap_adv_data_t;
#define ADV_1M_LEGACY_CONNECTABLE (ble_gap_adv_params_t) { \
.interval = 29, \
.duration = 31, \
.max_adv_evts = 0, \
.secondary_phy = 0, \
}
static uint8_t advertising_init_common(ble_gap_adv_data_t *ble_gap_adv_data,
ble_gap_adv_params_t adv_params)
{
uint8_t advHandle = 19;
ble_gap_adv_data->adv_params = adv_params;
ble_gap_adv_data->adv_program = 31963;
return advHandle;
}
#include <iostream>
int main()
{
ble_gap_adv_data_t m_adv_data;
uint8_t m_adv_handle = advertising_init_common(&m_adv_data,
ADV_1M_LEGACY_CONNECTABLE);
std::cout
<< "handle: " << m_adv_handle << ", "
<< "program: " << m_adv_data.adv_program << ", "
<< "interval: " << m_adv_data.adv_params.interval << ", "
<< "duration: " << m_adv_data.adv_params.duration << ", "
<< "maxadvev: " << m_adv_data.adv_params.max_adv_evts << ", "
<< "secondph: " << m_adv_data.adv_params.secondary_phy << "\n";
}编译
$ g++ -O3 -g -std=c++11 -Wall -Wextra -Werror -c arm31.cpp
$这不会产生警告(在运行macOS 10.14.2 Mojave的Mac上，使用自制的G++ 8.2.0)。要获得警告，我还需要使用-pedantic：
$ g++ -O3 -g -std=c++11 -Wall -Wextra -Werror -pedantic -c arm31.cpp
arm31.cpp: In function ‘int main()’:
arm31.cpp:18:9: error: C++ designated initializers only available with -std=c++2a or -std=gnu++2a [-Werror=pedantic]
.interval = 29, \
^
arm31.cpp:39:52: note: in expansion of macro ‘ADV_1M_LEGACY_CONNECTABLE’
ADV_1M_LEGACY_CONNECTABLE);
^~~~~~~~~~~~~~~~~~~~~~~~~
arm31.cpp:19:9: error: C++ designated initializers only available with -std=c++2a or -std=gnu++2a [-Werror=pedantic]
.duration = 31, \
^
arm31.cpp:39:52: note: in expansion of macro ‘ADV_1M_LEGACY_CONNECTABLE’
ADV_1M_LEGACY_CONNECTABLE);
^~~~~~~~~~~~~~~~~~~~~~~~~
arm31.cpp:20:9: error: C++ designated initializers only available with -std=c++2a or -std=gnu++2a [-Werror=pedantic]
.max_adv_evts = 0, \
^
arm31.cpp:39:52: note: in expansion of macro ‘ADV_1M_LEGACY_CONNECTABLE’
ADV_1M_LEGACY_CONNECTABLE);
^~~~~~~~~~~~~~~~~~~~~~~~~
arm31.cpp:21:9: error: C++ designated initializers only available with -std=c++2a or -std=gnu++2a [-Werror=pedantic]
.secondary_phy = 0, \
^
arm31.cpp:39:52: note: in expansion of macro ‘ADV_1M_LEGACY_CONNECTABLE’
ADV_1M_LEGACY_CONNECTABLE);
^~~~~~~~~~~~~~~~~~~~~~~~~
arm31.cpp:22:1: error: ISO C++ forbids compound-literals [-Werror=pedantic]
}
^
arm31.cpp:39:52: note: in expansion of macro ‘ADV_1M_LEGACY_CONNECTABLE’
ADV_1M_LEGACY_CONNECTABLE);
^~~~~~~~~~~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors下一步
请使用此源代码并在您的系统上编译它。然后修补它，直到它复制你看到的错误。然后将修改后的代码作为对问题的编辑。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/54246949
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