Thread: Some text box loving help...Visual C++

This piece is just a tool to check my firmware without having to hard code in values and rebuild constantly.

I am a nub when it comes to C++ and I just a small program to test my project. What I am trying to do:

1. User puts a value into TextBox1
2. A button is pressed
3. The program takes that value and loads it into a 64 byte buffer
4. Send to USB endpoint.

What I have so far: 1, 2, 4 Missing: step 3

I just don't know how to read the value the user put in the text box. Then how do I write that value to the output buffer.

Assumption, and not checking as this is a personal debug tool, that the value in the text box is in HEX, and when I read the text box, it stays as hex, and when I write it out it stays as hex.

Example:
In I put "050612DEADBEEF" in the text box, I want to read to the output buffer OB [] as:
OB[1] = 05;
OB[2] = 06;
...
OB[6] = BE;
OB[7] = EF;

Make sense?

I am using visual studio 2008 express if that matters.

Any tips are much appreciated. If I can get this to work, I can develop my FW much much faster! (Which I am also a huge nub at...)

You read the TexBox.Text member to get what is written in the TextBox

That should be a System::String if I am not mistaken.

You should then copy two bytes into a new System::String. Then convert the String to int (google for it). Or google for converting System::String to std::string and std::string to int. Once you have had the int, you can assign it to a byte.
Note that you need to convert to Hex. There are functions that allow you do to so. Don't know exactly which. I know strtol() does the job.

What exactly is the type of the buffer? In any case you should have a problem assigning an int to a byte.

Note that there is no
OB[7] = EF;
you would do
OB[7] = 0xEF;
I am pointing this because it is the same as writting
OB[7] = 239;

So don't get overly confused with the hex.

So
1) get two bytes and assign them to a string
2) use appropriate function
3) if you can do System::String -> std::string you can use string.c_str() to make std::string a char* and use strtol() to make the two characters the appropriate value to assign to a byte. The byte can be a type of char[]