Anything related to `c_str` method of class `std::basic_string` of C++ standard library.
Anything related to c_str method of class std::basic_string of C++ standard library.
See documentation of c_str on CPPreference.com.
Questions tagged [c-str]
73 questions
0
votes
1 answer
c_str() is only reading half of my string, why? How can I fix this? Is it a byte issue?
I am writing a client program and server program. On the server program, in order to write the result back to the client, I have to convert the string to const char* to put it in a const void* variable to use the write() function. The string itself…
Prinks
- 33
- 3
0
votes
2 answers
C++: Why does this string input fail while the other does not
I got this problem from a friend
#include
#include
#include
void riddle(std::string input)
{
auto strings = std::vector{};
strings.push_back(input);
auto raw = strings[0].c_str();
…
Wolfy
- 548
- 2
- 9
- 29
0
votes
1 answer
How does std::string's c_str() function return null-terminating string?
I cannot understand if char * returned from string.c_str() points to the same buffer (and not making any copy) how is it null terminated? does the function add null-terminator in the end of string? and what happens if buffer doesn't have any extra…
shota silagadze
- 163
- 10
0
votes
1 answer
Char pointer doesn't initialize as expected
MyClass.h
#pragma once
class MyClass {
public:
const char* m_var;
MyClass();
};
MyClass.cpp
#include
#include
#include "MyClass.h"
MyClass::MyClass() :
m_var(("Text_" +…
krsi
- 1,045
- 2
- 14
- 24
0
votes
2 answers
Converting strstream to sstream conflict about c_str()
I have this code block as written with strstream. And I converted it to sstream as below. I'm not sure, but I think printStream->str() is returning a string object with a copy (temporary) of the contents in the stream buffer pointed by printStream,…
şentürk şimşek
- 11
- 4
0
votes
3 answers
ifstream + opening random txt file (c_str)
I want to open a random .txt file and put the data into some strings.
It works if I write the path into the code.
I don't get it why this doesn't work.
#include
#include
using namespace std;
int main()
{
string file;
…
TF107
- 11
- 1
0
votes
3 answers
c++ string formed by copying index wise characters from other already initialised string. Not able to print newly formed string using cout
In C++, I created a new string (string class) by copying characters index wise from another string (string class) which was already initialized.
But I am unable to print this new string to the screen using cout. Using c_str() I am able to print it…
Zag
- 693
- 1
- 5
- 9
0
votes
2 answers
using method on member of struct from global function in C++
I'm very new to C++ and I'm always running into little things here and there. The most recent appears to be a problem with a struct.
struct student_record{
student_record(std::string name, int ident, double gpa){
for (int i = 0; i <…
billy reynolds
- 23
- 2
0
votes
1 answer
How to look up the ENUM type given a string?
I have an enum class like this:
class ContentTypeEnum {
public:
// it might have more types
enum Code { TEXT, XML, APPLICATION_JSON};
static const char* to_c_str(unsigned);
};
I was using it like this in my code as of…
john
- 11,311
- 40
- 131
- 251
0
votes
1 answer
Using String's c_str() and assigning to char const*: assignment of read-only location
My problem is this:
I have a constant pointer to a constant char pointer (2D char array where both dimensions are const). I need to assign C-strings to this array. I have a std::vector of std::strings which I used c_str() on to create a vector of…
Daniel Handojo
- 612
- 5
- 19
0
votes
1 answer
Error trying to convert string char into int
I have a simple program where I want to store the input into matrices for easy access. I am having trouble converting a simple string character into an int, can someone explain why my code is giving me this message when I try and…
mudejar
- 177
- 1
- 2
- 11
0
votes
3 answers
How to cast a std::stringbuf into an array of char?
What I'm trying to do here is to cast a stringbuf object into an array of char.
I do this to send the array of char to a C interface which doesn't understand the type std::stringbuf.
Here's a part of my code to illustrate the problem…
kidz55
- 333
- 4
- 26
0
votes
1 answer
How to resolve " invalid operands of types 'const char [ ]' and 'const char*' to binary 'operator+' "
I use Qt Creator and this code :
string execpath = "";
execpath += (QCoreApplication::applicationDirPath()).toStdString();
WinExec("ffmpeg -f dshow -t 32 -i audio=\"virtual-audio-capturer\" -y "+(execpath.c_str())+"\\sound.mp3", SW_HIDE); //…
AmirH
- 57
- 11
0
votes
1 answer
How to make String to const wchar_t* conversion function work under Windows and Linux
I work on a project written for MSVCC / Windows, that I have to port to GCC / Linux. The Project has its own String Class, which stores its Data in a QString from Qt. For conversion to wchar_t* there was originally this method (for Windows):
const…
weitho
- 80
- 1
- 9
0
votes
2 answers
VC++ function string::c_str(): the address of the first byte was set to 0 (compare to g++)
I met a strange problem when trying to get the result of a string’s function c_str() whose result is inconsistent with g++.
There is a function called Test to return a string instance. And I want to use a char* type to store the result (it’s…
user2650040
- 3
- 2