1v1/MSYOUPAI/3rd/NIMChat/NIMDemo/Category/NSString+NTES.m

//
//  NSString+NTES.m
//  NIMDemo
//
//  Created by chris on 15/2/12.
//  Copyright (c) 2015年 Netease. All rights reserved.
//

#import "NSString+NTES.h"
#import <CommonCrypto/CommonDigest.h>


@implementation NSString (NTES)

- (CGSize)stringSizeWithFont:(UIFont *)font{
    return [self sizeWithAttributes:@{NSFontAttributeName:font}];
}

- (NSString *)MD5String {
    const char *cstr = [self UTF8String];
    unsigned char result[16];
    CC_MD5(cstr, (CC_LONG)strlen(cstr), result);
    return [NSString stringWithFormat:
            @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
            result[0], result[1], result[2], result[3],
            result[4], result[5], result[6], result[7],
            result[8], result[9], result[10], result[11],
            result[12], result[13], result[14], result[15]
            ];
}


- (NSUInteger)getBytesLength
{
    NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
    return [self lengthOfBytesUsingEncoding:enc];
}


- (NSString *)stringByDeletingPictureResolution{
    NSString *doubleResolution  = @"@2x";
    NSString *tribleResolution = @"@3x";
    NSString *fileName = self.stringByDeletingPathExtension;
    NSString *res = [self copy];
    if ([fileName hasSuffix:doubleResolution] || [fileName hasSuffix:tribleResolution]) {
        res = [fileName substringToIndex:fileName.length - 3];
        if (self.pathExtension.length) {
           res = [res stringByAppendingPathExtension:self.pathExtension];
        }
    }
    return res;
}

- (NSString *)tokenByPassword
{
    //demo直接使用username作为account，md5(password)作为token
    //接入应用开发需要根据自己的实际情况来获取 account和token
    return [[NIMSDK sharedSDK] isUsingDemoAppKey] ? [self MD5String] : self;
}


@end