Converting std::string or string^ to byte array in c++/cli

Question

I know this is a frequently asked question and I havent got a clear answer for converting a std::string or String^ to a byte array for writing in to a stream for tcp communication.

This is what I have tried

bool CTcpCommunication::WriteBytes(const std::string& rdatastr)
{
  bool retVal = false;

  try
  {
    if (static_cast<NetworkStream^>(stream) != nullptr)
    {
      array<Byte>^data = System::Text::Encoding::ASCII->GetBytes(rdatastr); 
      stream->Write( data, 0, data->Length ); 
    }
  }
  catch(Exception^)
  {
    // Ignore, just return false
  }
  return retVal;
}

I know that here the GetBytes wont work and I have also checked marshalling options to convert std:string to .NET String but havent found out any.Can someone help me in solving this..

Marshaling to .NET String, which is well described everywhere, has nothing to do with this, you're trying to make a array<Byte> — Ben Voigt
– Ben Voigt, Commented Jul 6, 2012 at 4:29

Ben Voigt · Accepted Answer · 2012-07-06 12:12:15Z

5

The encoding is already correct, no conversion needed. Just copy:

array<Byte>^ data = gcnew array<Byte>(rdatastr.size());
System::Runtime::InteropServices::Marshal::Copy(IntPtr(&rdatastr[0]), data, 0, rdatastr.size());

edited Jul 6, 2012 at 12:12

answered Jul 6, 2012 at 4:28

Ben Voigt

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3 Comments

Ben Voigt Over a year ago

@ShivShambo: Full type name added.

ShivShambo Over a year ago

..thanks.. the error now says C2440: '<function-style-cast>' : cannot convert from 'const char *' to 'System::IntPtr'

Ben Voigt Over a year ago

@ShivShambo: Oh yeah, stupid BCL and lack of const-correctness. This edit should fix it.

A.Clymer · Accepted Answer · 2016-08-23 01:19:34Z

3

What about this method:

String ^sTemp;
array<Byte> ^TxData;

sTemp = "Hello";
TxData = System::Text::Encoding::UTF8->GetBytes(sTemp);

Link: http://www.electronic-designer.co.uk/visual-cpp-cli-dot-net/strings/convert-string-to-byte-array

answered Aug 23, 2016 at 1:19

A.Clymer

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Comments

ShivShambo · Accepted Answer · 2012-07-06 07:42:15Z

0

This worked for me..Thanks to Ben

IntPtr ptr((void*)rdatastr.data());
array<Byte>^ data = gcnew array<Byte>(rdatastr.size()); 
System::Runtime::InteropServices::Marshal::Copy(ptr, data, 0, rdatastr.size())

answered Jul 6, 2012 at 7:42

ShivShambo

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