studio sscanf

studio中使用sscanf函数不能正常解析参数

发布于 2020-08-17 15:39:50 浏览：996 订阅该版

采用studio处理GPS数据，使用的是sscanf函数，同样的代码VS2019中可以正常解析，使用studio解析参数不完整。

下面是VS2019写的测试代码：
```c
#define _CRT_SECURE_NO_WARNINGS

#include<stdio.h>
#include<stdlib.h>
#define BUF_SIZE 20

typedef struct gps_info
{
    char utc_time[BUF_SIZE];
    char status;
    float latitude_value;
    char latitude;
    float longtitude_value;
    char longtitude;
    float speed;
    float azimuth_angle;
    char utc_data[BUF_SIZE];
}GPS_INFO;

/* parse GPS information */
int main(void)
{
    GPS_INFO gps_info = { 0 };

float temp;
    int a;

const char* s = "$GNRMC,061424.000,A,3604.352623,N,12021.319553,E,0.00,229.83,170820,,,D*74";

a = sscanf(s, "$GNRMC,%[^,],%c,%f,%c,%f,%c,%f,%f,%[^,]", gps_info.utc_time, &gps_info.status, &gps_info.latitude_value, &gps_info.latitude, &gps_info.longtitude_value, &gps_info.longtitude, &gps_info.speed, &gps_info.azimuth_angle, gps_info.utc_data);

printf("a = %d\n", a);

int len = 0;
    char buf1[20];

printf("find GPS...\n");

printf("status %c\n", gps_info.status);

gps_info.latitude_value /= 100;
    temp = gps_info.latitude_value - (unsigned long)gps_info.latitude_value;
    temp = temp * 100 / 60;
    temp = (unsigned long)gps_info.latitude_value + temp;

len = sprintf(buf1, "%.6f", temp);

printf("latitude   %c:%s, data len %d\n", gps_info.latitude, buf1, len);

gps_info.longtitude_value /= 100;
    temp = gps_info.longtitude_value - (unsigned long)gps_info.longtitude_value;
    temp = temp * 100 / 60;
    temp = (unsigned long)gps_info.longtitude_value + temp;

len = sprintf(buf1, "%.6f", temp);

printf("longtitude %c:%s, data len %d\n", gps_info.longtitude, buf1, len);

system("pause");
    return 0;
}
```
执行结果位：
```
a = 9
find GPS...
status A
latitude   N:36.072544, data len 9
longtitude E:120.355324, data len 10
请按任意键继续. . .
```

下面的代码是studio上的测试代码
```c
rt_uint32_t rmc_data_parse(const char *data)
{
    GPS_INFO gps_info = {0};

float temp;
    int a;

const char* s = "$GNRMC,061424.000,A,3604.352623,N,12021.319553,E,0.00,229.83,170820,,,D*74";

LOG_D("a = %d", a);

if (gps_info.status == 'V')
    {

}
    else
    {
        int len = 0;
        char buf1[20];

LOG_D("find GPS...");

LOG_D("status %c", gps_info.status);

gps_info.latitude_value /= 100;
        temp = gps_info.latitude_value - (unsigned long)gps_info.latitude_value;
        temp = temp*100/60;
        temp = (unsigned long)gps_info.latitude_value + temp;

len = sprintf(buf1, "%.6f", temp);

LOG_D("latitude %c:%s, data len %d", gps_info.latitude, buf1, len);

gps_info.longtitude_value /= 100;
        temp = gps_info.longtitude_value - (unsigned long)gps_info.longtitude_value;
        temp = temp*100/60;
        temp = (unsigned long)gps_info.longtitude_value + temp;

len = sprintf(buf1, "%.6f", temp);

LOG_D("longtitude %c:%s, data len %d", gps_info.longtitude, buf1, len);
    }
    return 0;
}
```
执行结果为：
```

a = 2
find GPS...
status A
latitude :, data len -559038737
longtitude :, data len -559038737
```
看起来只解析了两个参数，且sprintf函数处理的结果也不正常。请问需要其他额外的设置嘛？