http://en.cppreference.com/w/cpp/string/basic_string/to_string http://www.cplusplus.com/reference/string/string/c_str/ first one will get you back a std::string, and the second one spits the string out in an old-school c-style array (char array). ...
cpp #include <iostream> #include <fstream> #include <string> #include <locale> #include <codecvt> // 转换字符串编码为UTF-8 std::string to_utf8(const std::wstring& wstr) { std::wstring_convert<std::codecvt_utf8<wchar_t>> conve...
问c_str()函数处理中文时出错，怎么解决依次执行如下命令 删除依赖包： sudo rm -rf /var/lib/mysql...
const char* c_str ( ) const; Get C string equivalent Generates a null-terminated sequence of characters (c-string) with the same content as the string object and returns it as a pointer to an array of characters. A terminating null character is automatically appended. The returned array poi...
string.cpp: In function ‘int main()’: string.cpp:11:28: error: cannot convert ‘std::__cxx11::string {aka std::__cxx11::basic_string<char>}’ to ‘const char*’ for argument ‘1’ to ‘FILE* fopen(const char*, const char*)’ ...
//The following code is useless for youstd::string name; std::cout << name.c_str();//Because name was not initialized with anything. Jan 25, 2014 at 6:41am Peter87(11251) vasilenko93wrote: the reason it points to a null-terminated string because it was not yet initialized. ...
ID: cpp/return-c-str-of-std-string Kind: problem Security severity: Severity: warning Precision: high Tags: - reliability - correctness Query suites: - cpp-security-and-quality.qls Click to see the query in the CodeQL repository Thec_strmethod ofstd::stringreturns a raw pointer to the me...
C++ String c_str() Function - Learn about the c_str() function in C++, which converts a C++ string to a C-style string. Discover its usage, syntax, and examples.
因为string类本身只是一个C++语言的封装,其实它的string对象内部真正的还是char缓冲区,所以.c_str()指向了这个缓冲区并返回const。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 const_Elem*c_str()const{// return pointer to null-terminated nonmutable arrayreturn(_Myptr());}...
The pointer is such that the range[c_str(),c_str()+size()]is valid and the values in it correspond to the values stored in the string with an additional null character after the last position. The pointer obtained fromc_str()may be invalidated by: ...