Reading Bytes from Serial Ports

Good day to all,
Please I need your guide and support on how to use this function:

Code:

---

ftStatus = myFtdiDevice.Read(readData, numBytesAvailable,ref numBytesRead);

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to read byte from the serial port.This function is part of the DLL that came with the chip(FT2232D) I am using on my board.I want to use the function to read a byte from the serial port and then send the value to the Graphic user interface.Unfortunately I was unable to get the expected value on my GUI.If I send for instance 40,what I get on the GUI are letters instead of the number 40 or at times the GUI will not even respond.Below are my lines of code I used to read the byte from the serial port:

The following instructions are executed whenever the CHECKBOX is checked

Code:

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private
void checkBox1_CheckedChanged(object sender, EventArgs e)

        {

           
 
UInt32 numBytesRead = 0;

           
UInt32 numBytesAvailable = 1;

            ftStatus = myFtdiDevice.Read(readData, numBytesAvailable, ref numBytesRead);
 

            label11.Text =Convert.ToString(ftStatus);



 
 
 
 

        }

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Below is the definition of the function from the supplied library:

Code:

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  Read data from an open FTDI device.

       
//

       
// Parameters:

       
//  dataBuffer:

       
//    An array of bytes which will be populated with the data read from the device.

       
//

       
//  numBytesToRead:

       
//    The number of bytes requested from the device.

       
//

       
//  numBytesRead:

       
//    The number of bytes actually read.

       
//

       
// Returns:

       
//    FT_STATUS value from FT_Read in FTD2XX.DLL

       
publicFTDI.FT_STATUS Read(byte[] dataBuffer, uint numBytesToRead, refuint numBytesRead);

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Your guide and assistance will be highly appreciated in this regard.
Best regards.

ok im not expert on this ,maybe someone here is, i do find it interesting
so in effort to help and looking into it , i did find some interesting examples that use it
even a open source library or example using ftdi stuff

additionally what i think you want to send to be displayed is not the status
(i think that value is more about return codes that describe the data in readData)

Quote:

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ftStatus = myFtdiDevice.Read(readData, numBytesAvailable, ref numBytesRead);
label11.Text =Convert.ToString(ftStatus);

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but instead if i understand right it should be something more like

Quote:

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ftStatus = myFtdiDevice.Read(readData, numBytesAvailable, ref numBytesRead);
label11.Text =Convert.ToString(readData); // were readdata actually contains the serial data bytes

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either way have a look at the examples below

hopefully some of these links will help

a similar question on stack overflow with a working example
http://stackoverflow.com/questions/1...ead-all-buffer
this above appears to have been using the dll from this FTDI site below but im not sure
http://www.ftdichip.com/Support/Soft...les/CSharp.htm

open source library
a example on git hub open source that reads a ftdi device this is the program source code
https://github.com/DVDPT/DigitalData...ack/Program.cs
this is the full github downloadable / clonable project
https://github.com/DVDPT/DigitalDataLogger