大佬教程收集整理的这篇文章主要介绍了iPhone哪些案例无法获得mac地址成功?,大佬教程大佬觉得挺不错的,现在分享给大家,也给大家做个参考。
失败的案例基于iPhone 4S和IOS版本5.0.1.
大家好,
你知道哪种情况(除了低内存)它会失败吗?任何想法或讨论将不胜感激.谢谢.
/* Original source code courtesy John from iOSDeveloperTips.com */ #include <sys/socket.h> #include <sys/sysctl.h> #include <net/if.h> #include <net/if_dl.h> - (NSString *)getMacAddress { int mgmTinfoBase[6]; char *msgBuffer = NULL; NSString *errorFlag = NULL; size_t length; // Setup the management Information Base (mib) mgmTinfoBase[0] = CTL_NET; // request network subsystem mgmTinfoBase[1] = AF_ROUTE; // RoutIng table info mgmTinfoBase[2] = 0; mgmTinfoBase[3] = AF_LINK; // request link layer information mgmTinfoBase[4] = NET_RT_IFLIST; // request all configured interfaces // With all configured interfaces requested,get handle index if ((mgmTinfoBase[5] = if_nametoindex("en0")) == 0) errorFlag = @"if_nametoindex failure"; // Get the size of the data available (store in len) else if (sysctl(mgmTinfoBase,6,NULL,&length,0) < 0) errorFlag = @"sysctl mgmTinfoBase failure"; // Alloc memory based on above call else if ((msgBuffer = malloc(length)) == NULL) errorFlag = @"buffer alLOCATIOn failure"; // Get system information,store in buffer else if (sysctl(mgmTinfoBase,msgBuffer,0) < 0) { free(msgBuffer); errorFlag = @"sysctl msgBuffer failure"; } else { // Map msgbuffer to interface message structure struct if_msghdr *interfaceMsgStruct = (struct if_msghdr *) msgBuffer; // Map to link-level socket structure struct sockaddr_dl *socketStruct = (struct sockaddr_dl *) (interfaceMsgStruct + 1); // Copy link layer address data in socket structure to an array unsigned char macAddress[6]; memcpy(&macAddress,socketStruct->sdl_data + socketStruct->sdl_nlen,6); // Read from char array into a String object,into Traditional Mac address format NSString *macAddressString = [NSString StringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X",macAddress[0],macAddress[1],macAddress[2],macAddress[3],macAddress[4],macAddress[5]]; NSLog(@"Mac Address: %@",macAddressString); // Release the buffer memory free(msgBuffer); return macAddressString; } // Error... NSLog(@"Error: %@",errorFlag); return errorFlag; }
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