Question

I am a C++ developer and shifted to wpf last week. Well I have used sprintf in my c++ apps many time and now I have across the need of having something equivalent to that in C#. Here is what I had done is C++:

char t_str[4] = {};
for(int i = 0; i < 4; i++)
{ 
    sprintf(t_str, "%02X", buffer[i]);
m_apiResponse[i]->setText(String(t_str));
}

where buffer[0] = 20;
buffer[1] = 30;
buffer[2] = 40;
buffer[3] = 50; and m_apiResponse is a textbox.

I had done this in my C# as follows:

Byte[] t_str = new Byte[4];
for (int i = 0; i < 4; i++)
{
         string bufstring = String.Format("{0:02}", buffer[i]);
         t_str = Encoding.UTF8.GetBytes(bufstring);
}

Response1Box = Convert.ToString(t_str[0]);
Response2Box = Convert.ToString(t_str[1]);
Response3Box = Convert.ToString(t_str[2]);
Response4Box = Convert.ToString(t_str[3]);

where ResposeBox is a textbox which I have bind to:

// Description of Response1Box
    private string _Response1Box;
    public string Response1Box
    {
        get
        {
            return _Response1Box;
        }

        set
        {
            _Response1Box = value;
            OnPropertyChanged("Response1Box");
        }
    }

buffer[64] is byte[].

Its not giving me the expected answer which my C++ method does. Is this the right way to do: string bufstring = String.Format("{0:02}", buffer[i]);
t_str = Encoding.UTF8.GetBytes(bufstring); Where am i wrong???

Please help 🙂

Answer 1

Try with

string bufstring = String.Format("{0:D2}", buffer[i]);

or (for hex output)

string bufstring = String.Format("{0:X2}", buffer[i]);

or (with C/C++ style hex prefix)

string bufstring = String.Format("0x{0:X2}", buffer[i]);

See Composite Formatting and Standard Numeric Format strings

Of course, inside the C++ loop you call the m_apiResponse[i]->setText, you should do something similar in the C# loop to achieve the same result.

string[] response = new TextBox[] {Response1Box, Response2Box, Response3Box, Response4Box};
for (int i = 0; i < 4; i++)
     response[i] = String.Format("{0:X2}", buffer[i]);

UPDATE: It is not clear to me what ResponseBox is, but if you have 4 string properties named Response[X]Box inside an object instance called ResponseBox then you could set these properties outside the loop in this way

ResponseBox.Response1Box = response[0];
ResponseBox.Response2Box = response[1];
.......