How to Convert unsigned char to std string in C

Question

I have unsigned char   want to convert it to std  string  Can you please tell me the safest way to do this

User · Answer

If has access to CryptoPP

Readable Hex String to unsigned char

std::string& hexed = "C23412341324AB";
uint8_t      buffer[64] = {0};
StringSource ssk(hexed, true,
            new HexDecoder(new ArraySink(buffer,sizeof(buffer))));

And back

std::string hexed;
uint8_t val[32]  = {0};
StringSource ss(val, sizeof(val), true,new HexEncoder(new StringSink(hexed));
// val == buffer

User · Answer

BYTE  is probably a typedef for unsigned char   but I can t say for sure   It would help if you tell us what BYTE is   If BYTE  is unsigned char   you can convert it to an std  string using the std  string range constructor  which will take two generic Iterators   const BYTE  str1   reinterpret cast lt const BYTE  gt    Hello World    int len   strlen reinterpret cast lt const char  gt  str1    std  string str2 str1  str1   len     That being said  are you sure this is a good idea   If BYTE is unsigned char it may contain non-ASCII characters  which can include NULLs   This will make strlen give an incorrect length

User · Answer

BYTE is nothing but typedef unsigned char BYTE   You can easily use any of below constructors  string   const char   s  size t n    string   const char   s

User · Answer

You just needed to cast the unsigned char into a char as the string class doesn t have a constructor that accepts unsigned char   unsigned char  uc  std  string s  reinterpret cast lt  char const   gt  uc        However  you will need to use the length argument in the constructor if your byte array contains nulls  as if you don t  only part of the array will end up in the string  the array up to the first null   size t len  unsigned char  uc  std  string s  reinterpret cast lt char const  gt  uc   len

User · Answer

BYTE  str1    Hello World   std  string str2  char   str1       construct on the stack      Alternatively   std  string  str3   new std  string  char   str1      construct on the heap    cout  lt  lt   amp str3  delete str3

User · Answer

Here is the complete code  include  lt bits stdc   h gt   using namespace std   typedef unsigned char BYTE   int main         method 1    std  vector lt BYTE gt  data     H   E   L   L   O   1   2   3        string constructor accepts only const char   std  string s  const char   amp  data 0    data size       std  cout  lt  lt  s  lt  lt  std  endl       method 2   std  string s2 data begin   data end       std  cout  lt  lt  s2  lt  lt  std  endl       method 3   std  string s3 reinterpret cast lt char const  gt   amp data 0    data size        std  cout  lt  lt  s3  lt  lt  std  endl      return 0

[c++] How to Convert unsigned char* to std::string in C++?

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