GetURLFileLength.h 文件
/**
* @brief 通过网络url获得文件的大小
*/
@interface GetURLFileLength : NSObject<NSURLConnectionDataDelegate>
typedef void(^FileLength)(long long length, NSError *error);
@property (nonatomic, copy) FileLength block;
/**
* 通过url获得网络的文件的大小 返回byte
*
* @param url 网络url
*
* @return 文件的大小 byte
*/
- (void)getUrlFileLength:(NSString *)url withResultBlock:(FileLength)block;
GetURLFileLength.m 文件
@implementation GetURLFileLength
/**
* 通过url获得网络的文件的大小 返回byte
*
* @param url 网络url
*
* @return 文件的大小 byte
*/
- (void)getUrlFileLength:(NSString *)url withResultBlock:(FileLength)block
{
_block = block;
NSMutableURLRequest *mURLRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];
[mURLRequest setHTTPMethod:@"HEAD"];
mURLRequest.timeoutInterval = 5.0;
NSURLConnection *URLConnection = [NSURLConnection connectionWithRequest:mURLRequest delegate:self];
[URLConnection start];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
NSDictionary *dict = [(NSHTTPURLResponse *)response allHeaderFields];
NSNumber *length = [dict objectForKey:@"Content-Length"];
[connection cancel];
if (_block) {
_block([length longLongValue], nil); // length单位是byte，除以1000后是KB（文件的大小计算好像都是1000，而不是1024），
}
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(@"获取文件大小失败：%@",error);
if (_block) {
_block(0, error);
}
[connection cancel];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
当中获得到头信息中 dict包含的信息可以通过解析获得，打印的dict内容如下：
Printing description of dict:
{
"Accept-Ranges" = bytes;
"Access-Control-Allow-Origin" = "*";
"Access-Control-Expose-Headers" = "X-Log, X-Reqid";
"Access-Control-Max-Age" = 2592000;
Age = 1;
"Cache-Control" = "public, max-age=31536000";
Connection = "keep-alive";
"Content-Disposition" = "inline; filename=\"4587945932505.mp4\"";
"Content-Length" = 1149810; // 文件的大小
"Content-Transfer-Encoding" = binary;
"Content-Type" = "video/mp4"; // 文件的类型
Date = "Fri, 05 Aug 2016 01:55:16 GMT";
Etag = "\"Fo5QDSpIMMLcV2W2fH899FH4q********\"";
"Last-Modified" = "Fri, 22 Jul 2016 01:46:05 GMT"; // 最近一次修改时间
Server = nginx;
"X-Log" = "mc.g;IO:2";
"X-Qiniu-Zone" = 0;
"X-Reqid" = vHoAANGi1Q6OxmcU;
"X-Via" = "1.1 suydong34:0 (Cdn Cache Server V2.0), 1.1 yd70:4 (Cdn Cache Server V2.0)";
}
如果要获取本地文件的文件的信息(文件大小)，同样可以在GetURLFileLength.h 文件中
/**
* 通过文件的名字以及创建的时间获得文件的大小 返回byte
*
* @param fileName 文件名字
* @param created 文件在服务器的创建时间 通过创建的时间建立的目录文件
* @param block length:文件长度， status:是否已经下载 返回 已下载，未下载
* @return
*/
- (void)getLocalPathFileLength:(NSString *)fileName created:(UInt32)created withResultBlock:(void(^)(long long length, NSString *status))block;
GetURLFileLength.m 文件
- (void)getLocalPathFileLength:(NSString *)fileName created:(UInt32)created withResultBlock:(void(^)(long long length, NSString *status))block
{
// 判断是否已经离线下载了
NSString *documentsDirectory = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
// filepath是通过一定的方式拼接的，我的文件一般存在于documents下的LOCAL_SAVE_PATH当中，然后以created作为文件的目录保存，所以完整的路径拼接即如下：
NSString *path = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@/%d/%@", LOCAL_SAVE_PATH, created, fileName]];
NSFileManager *filemanager = [NSFileManager defaultManager];
if ([filemanager fileExistsAtPath:path]) {
long long length = [[filemanager attributesOfItemAtPath:path error:nil] fileSize];
if (block) {
block(length, @"已下载");
}
} else {
if (block) {
block(0, @"未下载");
}
}
}
其他信息也可以如下获取
/**
* 通过文件的路径获得本地文件的基本信息
*
* @param filePath <#filePath description#>
* @param block <#block description#>
*/
- (void)getFileInfoByFilePath:(NSString *)filePath WithBlock:(void(^)(long long fileSize, NSDate *modificationtime, NSError *error))block
{
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error = nil;
NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:filePath error:&error];
if (fileAttributes != nil) {
NSNumber *fileSize = [fileAttributes objectForKey:NSFileSize];
NSDate *fileModDate = [fileAttributes objectForKey:NSFileModificationDate]; // 最近一次的修改时间
if (block) {
block([fileSize unsignedLongLongValue], fileModDate, nil);
}
} else {
if (block) {
block(0, nil, [NSError errorWithDomain:@"文件路径出错" code:100 userInfo:nil]);
}
}
}
