Converting string to bytes and send() it

Question

I'm making a packet sender.

Where the user can input the packet they want to send on a RichTextBox.

this->packetdata = (gcnew System::Windows::Forms::RichTextBox());

Sample input:

03 00 00 13 0e e0 00 00 00 00 00 01 00 08 00 00 00 00 00 03
00 00 6a 02 f0 80 7f 65 82 00 5e 04 01 01 04 01 01 01 01 ff

The server should receive:

03 00 00 13 0e e0 00 00 00 00 00 01 00 08 00 00 00 00 00 03
00 00 6a 02 f0 80 7f 65 82 00 5e 04 01 01 04 01 01 01 01 ff

But the server is receiving this instead:

30 33 20 30 30 20 30 30 20 31 33 20 30 65 20 65   03 00 00 13 0e e
30 20 30 30 20 30 30 20 30 30 20 30 30 20 30 30   0 00 00 00 00 00
20 30 31 20 30 30 20 30 38 20 30 30 20 30 30 20    01 00 08 00 00 
30 30 20 30 30 20 30 30 20 30 33 0a 30 30 20 30   00 00 00 03.00 0
30 20 36 61 20 30 32 20 66 30 20 38 30 20 37 66   0 6a 02 f0 80 7f
20 36 35 20 38 32 20 30 30 20 35 65 20 30 34 20    65 82 00 5e 04 
30 31 20 30 31 20 30 34 20 30 31 20 30 31 20 30   01 01 04 01 01 0
31 20 30 31 20 66 66 20                           1 01 ff

How do I convert the data on the RichTextBox to remove all space and treat each as byte and send it.

This kind of approach works though:

char this[] = {0x03, 0x00, 0x00, 0x13, 0x0e, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03
0x00, 0x00, 0x6a, 0x02, 0xf0, 0x80, 0x7f, 0x65, 0x82, 0x00, 0x5e, 0x04, 0x01, 0x01, 0x04, 0x01, 0x01, 0x01, 0x01, 0xff}

With that code, the server receives the correct data.

So how do I turn the Text inside the TextBox into something like that?

This works

int mysendfunc(char *sendbuf, int size);

(...)

std::string inputpkt = marshal_as<std::string>(this->packetdata->Text);
std::istringstream reader(inputpkt);
std::vector<char> pkt;
do
{
    // read as many numbers as possible.
    for (int number; reader >> std::hex >> number;) {
        pkt.push_back(number);
    }
    // consume and discard token from stream.
    if (reader.fail())
    {
        reader.clear();
        std::string token;
        reader >> token;
    }
}
while (!reader.eof());

int hehe = mysendfunc(pkt.data(), pkt.size());

Not being up on CLI, I can't answer if the have a magic function to do this, I suppose they do, but in standard C++ I would istringstream the input string, then slurp out formatted data using operator >>(), pushing each value into a std::vector<uint8_t> and finally send vec.size() bytes from vec.data() — WhozCraig
– WhozCraig, Commented Apr 24, 2013 at 14:28
@BenVoigt can you please point out where I'm treating it as decimal and how I should treat it as hex? — zikdaljin
– zikdaljin, Commented Apr 24, 2013 at 20:06
@zikdaljin: It's reader >> number that assumes decimal. As I already said in my answer, you can use reader >> hex >> number instead. — Ben Voigt
– Ben Voigt, Commented Apr 24, 2013 at 20:42

Ben Voigt · Accepted Answer · 2013-04-24 20:41:17Z

1

Your function using istringstream is really close. To interpret the data as hexadecimal, you will need reader >> hex >> number.

And then

mysendfunc(&pkt[0], pkt.size())

Or use

array<String^>^ hexCodes = this->packetdata->Text->Split(" ");
Converter<String^, SByte>^ parser = gcnew Converter<String^, SByte>(&SByte::Parse);
array<SByte>^ bytes = Array::ConvertAll(hexCodes, parser);
pin_ptr<char> pkt = &bytes[0];
int x = mysendfunc(pkt, bytes->Length);

edited Apr 24, 2013 at 20:41

answered Apr 24, 2013 at 19:36

Ben Voigt

286k45 gold badges444 silver badges764 bronze badges

Sign up to request clarification or add additional context in comments.

6 Comments

zikdaljin Over a year ago

I got some error on Array::ConvertAll and on the split part.

Ben Voigt Over a year ago

@zikdaljin: Splitting the code up like this, what line is the error now?

zikdaljin Over a year ago

the last line pkt now says cli::pin_ptr<unsigned char> is incompatible with parameter of type char*

Ben Voigt Over a year ago

@zikdaljin: Ok, it's a signed char vs unsigned char issue. I'll fix it.

zikdaljin Over a year ago

Actually now it gives error on &bytes[0] signed char vs unsigned char on that one now. and Text->Split() gives error too. no instance of over loaded function.

|

LeCoc · Accepted Answer · 2013-04-24 11:49:18Z

0

You are sending the ASCII codes for the text "03 00 00 ....". You actually want to send the string "030000...", in its serialized mode.

std::string str("03 00 00 13 0e e0 00 00 00 00 00 01 00 08 00 00 00 00 00 03
00 00 6a 02 f0 80 7f 65 82 00 5e 04 01 01 04 01 01 01 01 ff");
sendbytes(str.c_str(), str.size());

answered Apr 24, 2013 at 11:49

LeCoc

3122 silver badges8 bronze badges

Collectives™ on Stack Overflow

Converting string to bytes and send() it

2 Answers 2

6 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

6 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related