std::string stringf(const char* format, ...){ va_list arg_list; va_start(arg_list, format); // SUSv2 version doesn't work for buf NULL/size 0, so try printing // into a small buffer that avoids the double-rendering and alloca path too... char short_b…

How to convert a std::string to const char* or char*? 1. If you just want to pass a std::string to a function that needs const char* you can use std::string str; const char * c = str.c_str(); If you want to get a writable copy, like char *, you can d…

环境:vs2010 1.CString转string //第一种方式: CString str = _T("CSDN"); USES_CONVERSION; std::string s(W2A(str)); //第二种方式: CString str = _T("CSDN"); std::string s = (CT2A)str; 2.string转CString CString str; std::string s=“CSDN“; str=s.c_str(); 3.…

本文转自:https://blog.csdn.net/rongrongyaofeiqi/article/details/52442169 一:转化总结形式如下: 使用时,要对源格式和目标格式进行初始化.源格式赋值为具体的内容,目标格式赋值为空. 二.总结方法: 1.        变成string,直接赋值. 2.        char[]变成别的,直接赋值. 3.        char*变constchar*容易,const char*变char*麻烦.<const_cast><c…

环境:codeblocks 语言:C++ 在执行:throw new exception("queue is empty.");时 遇到问题:error: no matching function for call to 'std::exception:exception(const char[16])' 解决办法:修改为 std::logic_error e("xxx."); throw std::exception(e);…

转化总结如下: 目标格式 源格式 string const char* char* char[] string NULL const char*=string.c_str(); const char*=string.c_str(); char*=const_cast<char*>(const char*); for(int i=0;i< string.length();i++) { char[i]=string[];} const char* string =const char*; N…

string.const char*. char* .char[]相互转换(全) https://blog.csdn.net/rongrongyaofeiqi/article/details/52442169#commentBox…

Error no matching function for call to 'std::exception::exception(const char [15])' Error 'logic_error' was not declared in this scope 错误原因 C++在使用VS 编译时抛出异常可以用下列语句: throw std::exception("XXX"); 但使用Dev-C++ (GCC) 编译时,会报以下错误: Error no matching func…

转载:http://www.cnblogs.com/little-sjq/p/9fed5450f45316cf35f4b1c17f2f6361.html C++ Primer 第07章 类 7.1.2 ​Sales_data类的定义如下: #ifndef SALES_DATA_H #define SALES_DATA_H #include <string> #include <iostream> class Sales_data { public: std::string isbn…

#include <iostream> #include <string> #include <memory> using namespace std; const char* string2constchar(string s){ shared_ptr<string> tmp (new string(s)); return tmp->c_str(); } int main() { string s = "demo"; char *…