How to Convert a std::string to a char* or char[] in C ?

Convert std::string to char* or char[]

Converting a std::string to a char* or char[] data type can be a common task in C , but it's worth noting that automatic conversion is not supported. To achieve this, the c_str() method can be used to obtain a C-style string representation of the std::string.

std::string str = "string";
const char *cstr = str.c_str();

The c_str() method returns a const char pointer, so if a non-const pointer is required, the data() method can be used instead:

char *cstr = str.data();

Alternative Options:

In addition to using c_str() and data(), there are other methods for converting std::string to char*:

• Copying Characters into a Vector:

  std::vector<char> cstr(str.c_str(), str.c_str() + str.size() + 1);

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  Note that this version copies the terminating null character ('

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