Problem with type casting?

Hi

I am new in QT.
I am trying to convert text string to hexadecimal.

Code:

---

void string2hex::browse()
{
	QString str="abcd";
	QString res;
	res = String2Hex(str);
	QMessageBox::information(this,tr("Output is"),res);
}
 
QString string2hex:: Byte2Hex(unsigned char c)
{
	//code which convert bytes into hex
}
QString string2hex:: String2Hex(QString S)
{
	unsigned int StrLen = S.length();
	QString Result;
 
	for (unsigned int i = 0; i < StrLen; i++)
		Result  += Byte2Hex((unsigned char)S[i]);
	return Result;
}

---

I gives the compilation error

Quote:

---

string2hex.cpp: In member function ‘QString string2hex::String2Hex(QString)’:
string2hex.cpp:53: error: invalid cast from type ‘QCharRef’ to type ‘unsigned char’

---

So can anyone tell me how to do this type casting?

thanks in advance.

Have a look at the [] operator for a QString in the Qt documentation. It returns a const QChar instead of an unsigned char.

Try:

Code:

---

S[i].toAscii()

---

The toAscii() method will return a char which you need.

How about using QByteArray ? It already has QByteArray::toHex.
Also conversion between QString and QByteArray is a step away.