这个代码网上很多,留在这里做个备份. static std::string ConvertCStringToUTF8( CString strValue ) { std::wstring wbuffer; #ifdef _UNICODE wbuffer.assign( strValue.GetString(), strValue.GetLength() ); #else /* * 转换ANSI到UNICODE * 获取转换后长度 */ int length = ::MultiByteToWide…

char* UnicodeToUtf8(CString unicode) { int len; len = WideCharToMultiByte(CP_UTF8, 0, (LPCWSTR)unicode, -1, NULL, 0, NULL, NULL); char *szUtf8=new char[len + 1]; memset(szUtf8, 0, len * 2 + 2); WideCharToMultiByte (CP_UTF8, 0, (LPCWSTR)unicode, -1, s…

iOS 字符串 MD5 Objective-C 实现 需要引入头文件 #import <CommonCrypto/CommonCrypto.h> 这里用方法实现 + (nullable NSString *)md5:(nullable NSString *)str { if (!str) return nil; const char *cStr = str.UTF8String; unsigned char result[CC_MD5_DIGEST_LENGTH]; CC_MD5(cStr,…

Given a string, find the length of the longest substring without repeating characters. Examples: Given "abcabcbb", the answer is "abc", which the length is 3. Given "bbbbb", the answer is "b", with the length of 1.…

Implement strStr(). Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. Example 1: Input: haystack = "hello", needle = "ll" Output: 2 Example 2: Input: haystack = "aaaaa",…

Write a function that takes a string as input and returns the string reversed. Example 1: Input: "hello" Output: "olleh" Example 2: Input: "A man, a plan, a canal: Panama" Output: "amanaP :lanac a ,nalp a ,nam A" 编写…

Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Input: "tree" Output: "eert" Explanation: 'e' appears twice while 'r' and 't' both appear once. So 'e' must appear before both 'r' and 't'. Th…

Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order. Example 1: Input: "Let's take LeetCode contest" Output: "s'teL ekat edoCteeL tsetnoc"…

很多时候我们会用到md5加密,下面是swift 3.0的实现方法: 首先新建桥接文件 xx-Bridging-Header,方法很多,这里就不介绍了. 然后在桥接文件中引入加密库 #import <CommonCrypto/CommonDigest.h> 新建一个 Swift 扩展类文件 String+Extension extension String { /// MD5 加密 /// /// - Returns: 32 位大写 func ss_md5() -> String { le…

介绍 一.sqlite是纯C语言中底层的数据库,在OC和Swift中都是经常使用的数据库,在开发中,可以使用代码创建数据库,可以使用图形化界面创建数据库.例如SQLiteManager.SQLiteStudio等 二.对常用的一些方法进行解释如下: OpaquePointer: *db,数据库句柄,跟文件句柄FIFL类似,这里是sqlite3指针: sqlite3_stmt: *stmt,相当于ODBC的Command对象,用于保存编译好的SQL语句: sqlite3_open(): 打开数据库…