how to read this string

[marco]

hi,

i'm trying to get a board with relays working under c++, i have a sample
code in visual basic to compose a string that is send to the serial port
but i am confused how to translate it to a c++ string
here is the vb code:

messagestring = Chr$(13) & Chr$(address) & "S6" & Chr$(checksum)

where adress is an integer from 1 to 255 and checksum is also an integer

how does this string look like? can anyone help?

thanx

marco

 

[Victor Bazarov]

i'm trying to get a board with relays working under c++, i have a sample
code in visual basic to compose a string that is send to the serial port
but i am confused how to translate it to a c++ string
here is the vb code:

messagestring = Chr$(13) & Chr$(address) & "S6" & Chr$(checksum)

where adress is an integer from 1 to 255 and checksum is also an integer

how does this string look like? can anyone help?

Try

std:stringstream os;
os << '\r' << (unsigned char)address << "S6" << checksum;
std::string str_to_output(os.str());

and if you need the const char*, use

str_to_output.c_str()

HTH

Victor

P.S. AFAIK, Chr$(13) is the "carriage return", and that's why I used \r
in the output statement. It makes it a bit more portable, although you
could just as well use (char)13 .

 

[marco]

After some experimenting everything works, thanx

marco