So if I understand correctly a BYTE is an unsigned character so here is the code I:

void CEL505_Lab002Dlg::OnBnClickedButtonInput()
{
// TODO: Add your control notification handler code here
CString sBuffer;
unsigned char temp_num;
InputDlg input;
input.m_sHexInput.Format( _T("%02X"),m_bNumber);
if(input.DoModal() ==IDOK)
{

sBuffer.Format(_T("%s"), input.m_sHexInput);
temp_num.Format( _T("%u"),input.m_sHexInput);



//MessageBox(sBuffer,_T("Custom Dialog Result"),MB_OK | MB_ICONINFORMATION);
}

}

I push a BYTE to an input box as a Hex, and then after the user updates the number and presses OK the number updated value is returned as a CString.
sBuffer will hold the string, but I want temp_num to hold the returned string as a BYTE or unsigned character.

the problem seems to be "temp_num.Format( _T("%u"),input.m_sHexInput);"

wither I haven't given temp_num a class properly or I am going about this all wrong.

Help is greatly appreciated

 

I guess I'm not the only one who is stumped by this, makes me feel not so bad..

 

So if I understand correctly a BYTE is an unsigned character so here is the code I:

void CEL505_Lab002Dlg::OnBnClickedButtonInput()
{
// TODO: Add your control notification handler code here
CString sBuffer;
unsignedchar temp_num;
InputDlg input;
input.m_sHexInput.Format( _T("%02X"),m_bNumber);
if(input.DoModal() ==IDOK)
{
 
sBuffer.Format(_T("%s"), input.m_sHexInput);
temp_num.Format( _T("%u"),input.m_sHexInput);
 
 
 
//MessageBox(sBuffer,_T("Custom Dialog Result"),MB_OK | MB_ICONINFORMATION);
}
 
}

I push a BYTE to an input box as a Hex, and then after the user updates the number and presses OK the number updated value is returned as a CString.
sBuffer will hold the string, but I want temp_num to hold the returned string as a BYTE or unsigned character.

the problem seems to be "temp_num.Format( _T("%u"),input.m_sHexInput);"

wither I haven't given temp_num a class properly or I am going about this all wrong.

Help is greatly appreciated

You seem to have confused a few things. Without seeing the declaration of InputDlg, is seems that m_sHexInput is a CString. In this case,

sBuffer.Format(_T("%s"), input.m_sHexInput);

can be simply

sBuffer = input.m_sHexInput;

and

temp_num.Format( _T("%u"),input.m_sHexInput);

should be something like:

temp_num = atoi(input.m_sHexInput);

This is poor code though as there is no error checking (the user could enter anything), and atoi will convert to an int and you are truncating to an unsigned char. This works for decimal input format, if you expect the input to be in hex format (0x...) then you need to investigate further.

 

The final solution was (entered value was checked for errors proir to being passed back here):

void CEL505_LabsDlg::OnBnClickedInput()
{
// TODO: Add your control notification handler code here
CString sBuffer;
InputDlg input;
input.m_sHexInput.Format( _T("%02X"),m_bNumber);
if(input.DoModal() ==IDOK)
{
 
sBuffer.Format(_T("%s"), input.m_sHexInput);
// convert the unicode to ASCII text
CT2A text (input.m_sHexInput);
// cast the ASCII HEX text to BYTE 
m_bNumber = (BYTE) strtoul (text.m_szBuffer,NULL,16);
//copy temp to global byte and update values.
//m_bNumber=bTempNum;
UpdateLEDs();
UpdateNumericEquivalents();
UpdateExternalLEDs();

// //MessageBox(sBuffer,_T("Custom Dialog Result"),MB_OK | MB_ICONINFORMATION);
}
}