question
There is a need to pass files and pictures in your mobile phone to other devices in the business scenario.
It is not only possible to pass on letters or materials.
plan
The most basic method: add a cloud between devices, upload information to the cloud, and synchronize information to each device. It is suitable for multiple devices. This is not necessary.
If it is between two devices and ignore the server, what should I do? Thinking of WiFi books in the book app, it seems that there is no cloud concept, how can it be done?
Serve the dishes
Adopt the framework GCDWebServer and introduced through CocoaPods
pod "GCDWebServer", "~> 3.0"
Set the local receiving directory, initialize the Server and start it
override func viewWillAppear(_ animated: Bool) {
(animated)
if let filepath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first as NSString? {
let path = ("transfer")
if !(atPath: path) {
do {
try (atPath: path, withIntermediateDirectories: false, attributes: nil)
} catch {
print(error)
}
}
webServer = GCDWebUploader(uploadDirectory: path)
webServer?.delegate = self
webServer?.allowHiddenItems = true
webServer?.allowedFileExtensions = ["doc", "docx", "xls", "xlsx", "txt", "pdf", "jpeg", "jpg"]
webServer?.title = "Shanzhai Tool"
webServer?.prologue = "Huanyin uses Shanzhai Tools WIFI management platform"
webServer?.epilogue = "Made in Shanzhai Bookstore"
if webServer?.start() == true, let address = (), > 0, let port = webServer?.port {
= "1.Make sure the device is on the same LAN \n2.Do not close this page when uploading \n3.Please enter this address on the web page \nhttp://\(address):\(port)/"
} else {
= "GCDWebServer not running!"
}
}
}
Get the IP address of the machine in the LAN and set up access links for other devices
#import <>
#import <arpa/>
#import <net/>
@implementation IPHelper
+ (NSString *)deviceIPAdress {
NSString *address = @"";
struct ifaddrs *interfaces = NULL;
struct ifaddrs *temp_addr = NULL;
int success = 0;
success = getifaddrs(&interfaces);
if (success == 0) { // 0 means successful acquisition temp_addr = interfaces;
while (temp_addr != NULL) {
if( temp_addr->ifa_addr->sa_family == AF_INET) {
// Check if interface is en0 which is the wifi connection on the iPhone
if ([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
// Get NSString from C String
address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
}
}
temp_addr = temp_addr->ifa_next;
}
}
freeifaddrs(interfaces);
return address;
}
#define IOS_CELLULAR @"pdp_ip0"
#define IOS_WIFI @"en0"
#define IOS_VPN @"utun0"
#define IP_ADDR_IPv4 @"ipv4"
#define IP_ADDR_IPv6 @"ipv6"
#pragma mark - Get the current network IP address of the device+ (NSString *)getIPAddress:(BOOL)preferIPv4 {
NSArray *searchArray = preferIPv4 ?
@[ IOS_VPN @"/" IP_ADDR_IPv4, IOS_VPN @"/" IP_ADDR_IPv6, IOS_WIFI @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6 ] :
@[ IOS_VPN @"/" IP_ADDR_IPv6, IOS_VPN @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6, IOS_WIFI @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4 ] ;
NSDictionary *addresses = [self getIPAddresses];
NSLog(@"addresses: %@", addresses);
__block NSString *address;
[searchArray enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL *stop)
{
address = addresses[key];
//Filter out IP address format if([self isValidatIP:address]) *stop = YES;
} ];
return address ? address : @"0.0.0.0";
}
+ (BOOL)isValidatIP:(NSString *)ipAddress {
if ( == 0) {
return NO;
}
NSString *urlRegEx = @"^([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
"([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
"([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
"([01]?\\d\\d?|2[0-4]\\d|25[0-5])$";
NSError *error;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:urlRegEx options:0 error:&error];
if (regex != nil) {
NSTextCheckingResult *firstMatch=[regex firstMatchInString:ipAddress options:0 range:NSMakeRange(0, [ipAddress length])];
if (firstMatch) {
NSRange resultRange = [firstMatch rangeAtIndex:0];
NSString *result=[ipAddress substringWithRange:resultRange];
//Output result NSLog(@"%@",result);
return YES;
}
}
return NO;
}
+ (NSDictionary *)getIPAddresses
{
NSMutableDictionary *addresses = [NSMutableDictionary dictionaryWithCapacity:8];
// retrieve the current interfaces - returns 0 on success
struct ifaddrs *interfaces;
if(!getifaddrs(&interfaces)) {
// Loop through linked list of interfaces
struct ifaddrs *interface;
for(interface=interfaces; interface; interface=interface->ifa_next) {
if(!(interface->ifa_flags & IFF_UP) /* || (interface->ifa_flags & IFF_LOOPBACK) */ ) {
continue; // deeply nested code harder to read
}
const struct sockaddr_in *addr = (const struct sockaddr_in*)interface->ifa_addr;
char addrBuf[ MAX(INET_ADDRSTRLEN, INET6_ADDRSTRLEN) ];
if(addr && (addr->sin_family==AF_INET || addr->sin_family==AF_INET6)) {
NSString *name = [NSString stringWithUTF8String:interface->ifa_name];
NSString *type;
if(addr->sin_family == AF_INET) {
if(inet_ntop(AF_INET, &addr->sin_addr, addrBuf, INET_ADDRSTRLEN)) {
type = IP_ADDR_IPv4;
}
} else {
const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6*)interface->ifa_addr;
if(inet_ntop(AF_INET6, &addr6->sin6_addr, addrBuf, INET6_ADDRSTRLEN)) {
type = IP_ADDR_IPv6;
}
}
if(type) {
NSString *key = [NSString stringWithFormat:@"%@/%@", name, type];
addresses[key] = [NSString stringWithUTF8String:addrBuf];
}
}
}
// Free memory
freeifaddrs(interfaces);
}
return [addresses count] ? addresses : nil;
}
Access this address in other devices
let address = () let port = webServer?.port http://\(address):\(port)/
Remark:
- Make sure the device is on the same LAN
- Do not close this page when uploading
Game Over
In the LAN, the device serves as the server and other devices serves as clients. The simple HTTP method uploads files to the server. The initial configuration path is the path to store files after receiving them.
The above is the detailed content of how to use IOS to implement WIFI transmission. For more information about IOS to implement WIFI transmission, please pay attention to my other related articles!