我想通过bluez API用C编写程序
我将此site用于教程:
这是我的密码:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>


int main(int argc, char **argv)
{
    int dev_id = hci_get_route(NULL);
    int res_scan=NULL;
    int count;
    inquiry_info *device_info=NULL;
    res_scan = hci_inquiry(dev_id,3,255,NULL,&device_info,IREQ_CACHE_FLUSH);
    printf("%i\n",res_scan);
    for(count = 0;count < res_scan;count++)
    {
        char *name;
        printf("count Before : %i\n",count);
        ba2str(&(device_info+count)->bdaddr,&name);
        printf("count After : %i\n",count);

        printf("%s\n",&name);
    }



}

外置控制台:
2
count Before : 0
count After : 1111833143
00:17:EB:5D:1B:86

为什么在获取随机值之后count值?
在那个来源我链接这个问题不会发生!?

最佳答案

在将变量作为引用传递之前,您需要分配内存,最好的选择是在循环之外进行分配。

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>


int main(int argc, char **argv)
{
    int dev_id = hci_get_route(NULL);
    int res_scan=NULL;
    int count;
    char *name = (char *) malloc(248*sizeof(char));
    inquiry_info *device_info=NULL;
    res_scan = hci_inquiry(dev_id,3,255,NULL,&device_info,IREQ_CACHE_FLUSH);
    printf("%i\n",res_scan);
    for(count = 0;count < res_scan;count++)
    {
        printf("count Before : %i\n",count);
        ba2str(&(device_info+count)->bdaddr,name);
        printf("count After : %i\n",count);

        printf("%s\n",name);
    }

 free(name);

}

这样做你的代码将更快,因为你将分配内存只有一次。

10-04 17:15