前言:
在实际使用中,很多设备都需要用到wifi模块,但是如何使设备智能的连接到热点上。
其中一种方法是:先把设备的wifi模块设置为ap模式,客户端先搜索到这个设备的热点,
然后连接它,再把设备真正需要连接的热点发送给设备,从而使设备可以连接到指定的热点上。
一,设置为ap模式后,如何获取其它热点
设置为ap模式,默认是无法查找到别的wifi热点的,这个需要以下操作
iwpriv ra0 set SiteSurvey
然后在通过以下命令来获取热点信息
iwpriv ra0 get_site_survey
二,编程获取wifi热点信息
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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typedef unsigned char HI_U8;
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typedef unsigned short HI_U16;
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typedef unsigned int HI_U32;
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typedef signed char HI_S8;
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typedef char * HI_PS8;
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typedef short HI_S16;
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typedef int HI_S32;
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typedef int * HI_PS32;
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#define MK_PROC_MAX_WIFI_AP_SIZE (10)
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typedef struct _HI_DEV_WIFI_SCANNING_S
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{
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HI_U32 u32Size; //结构体的大小
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HI_U32 u32ApNum; //* 第几个ap */
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HI_U32 u32Frequency; //频率
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HI_U32 u32CurrentUsed; //* 是否正在使用 1:正在使用 0:未使用 */
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HI_U32 u32SignalQuality; //* 信号质量 */
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HI_U32 u32BitRate; //* 传输速度(比特率) */
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char szEssid[32]; //* essid */
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char szProtocol[16]; //ap support protocol
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char szMacAddr[32]; //* mac addr */
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HI_U8 u8Mode; //mode 0:Auto 1:Managed 2:Ad-Hoc ...
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HI_U8 u8IsEncrypt; //*是否加密1:加密 0:不加密*/
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HI_U8 u8EncrypType; //*网络加密方式0:NONE 1:WAP 2:WAP2 3:WEP */
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HI_U8 u8AuthMode; //* 认证模式 0:NONE 1:EAP 2:PSK 3:OPEN 4:SHARED*/
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HI_U8 u8SecretKeyType; //密钥管理方式 0:none 1:AES 2:TKIP
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HI_U8 u8Res[7];
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}HI_DEV_WIFI_SCANNING_S,*LPHI_DEV_WIFI_SCANNING_S;
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static void enable_softap_scanning(void)
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{
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system("iwpriv ra0 set SiteSurvey"); //开启ap扫描功能
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sleep(2);
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}
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//*网络加密方式0:NONE 1:WAP 2:WAP2 3:WEP */
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// 4:other
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static int get_ap_security_type(char *buf)
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{
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int type = 0;
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if (buf == NULL) return -1;
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if (strstr(buf, "WPA2") != NULL)
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type = 2;
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else if (strstr(buf, "WPA") != NULL)
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type = 1;
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else if (strstr(buf, "WEP") != NULL)
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type = 3;
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else if (strstr(buf, "NONE") != NULL)
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type = 0;
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else
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type = 4;
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return type;
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}
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int _softap_get_scan_res(HI_DEV_WIFI_SCANNING_S *stScanInfo)
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{
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FILE *fp;
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char buf[256] = {0};
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int findFlag = 0;
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int index = 0;
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char chBuf[4] = {0}, ssidBuf[32] = {0}, macBuf[32] = {0},
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athBuf[32] = {0}, sigBuf[16] = {0}, wBuf[8] = {0},
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extBuf[8] = {0}, ntBuf[4] = {0};
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enable_softap_scanning();
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if((fp = popen("iwpriv ra0 get_site_survey", "r")) == NULL) //获取ap扫描结果
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{
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printf("open cmd: iwpriv ra0 get_site_survey fail!\n");
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return -1;
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}
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while(fgets(buf, sizeof(buf), fp) != NULL)
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{
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if(!findFlag && strstr(buf, "Ch") != NULL)
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{
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findFlag = 1;
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continue;
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}
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if (findFlag)
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{
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if(sscanf(buf, "%s %s %s %s %s %s %s %s\n",chBuf,ssidBuf,macBuf,athBuf,\
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sigBuf,wBuf,extBuf,ntBuf) != 8)
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{
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continue;
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}
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if ((strcmp(ssidBuf, "") == 0) ||
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(strcmp(ssidBuf, "CMCC-AUTO") == 0) ||
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(strcmp(ssidBuf, "CMCC-WEB") == 0) ||
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(strcmp(ssidBuf, "CMCC-FREE") == 0) ||
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(strcmp(ssidBuf, "CMCC") == 0) ||
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(strcmp(macBuf, "") == 0) ||
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(strcmp(athBuf, "") == 0) ||
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(atoi(sigBuf) <= 0))
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{
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continue;
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}
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else
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{
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int security_type = 0;
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if ((security_type = get_ap_security_type(athBuf)) < 0)
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continue;
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strncpy(stScanInfo[index].szEssid,ssidBuf,32);
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strncpy(stScanInfo[index].szMacAddr,macBuf,32);
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stScanInfo[index].u32SignalQuality = atoi(sigBuf);
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stScanInfo[index].u32CurrentUsed = 0;
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stScanInfo[index].u8EncrypType = security_type;
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++index;
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if (index >= MK_PROC_MAX_WIFI_AP_SIZE)
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break;
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}
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}
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}
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pclose(fp);
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return index;
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}
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static void show_ap(HI_DEV_WIFI_SCANNING_S *stScanInfo,int count)
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{
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int index = 0;
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printf("%-4s%-32s%-32s%-8s%-8s\n","id","ssid","essid","sig","sec");
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for (index = 0; index < count; index++)
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{
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#if 0
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printf("%*d,ssid[%*s],essid[%*s],signal[%*d],type[%*d]\n",4,index,
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32,stScanInfo[index].szEssid,
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32,stScanInfo[index].szMacAddr,
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4,stScanInfo[index].u32SignalQuality,
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4,stScanInfo[index].u8EncrypType);
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#else
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printf("%-4d%-32s%-32s%-8d%-8d\n",index,
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stScanInfo[index].szEssid,
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stScanInfo[index].szMacAddr,
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stScanInfo[index].u32SignalQuality,
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stScanInfo[index].u8EncrypType);
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#endif
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}
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}
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int main(int argc,char *argv[])
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{
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HI_DEV_WIFI_SCANNING_S stScanInfo[MK_PROC_MAX_WIFI_AP_SIZE];
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int ap_count = 0;
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ap_count = _softap_get_scan_res(stScanInfo);
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show_ap(stScanInfo,ap_count);
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return 0;
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}
对 fgets 函数有疑惑的请看:
fgets函数的理解
测试结果:
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