Looking if any character whose ascii code is greater than 127

mulfycrowh

Hi,
I have a QString that perhaps includes some characters whose ASCII code is greater than 127.
I would like to check.
I tried using:

QString test;
QChar char;
for (int ascii = 128; ascii <= 255; ascii++)
{
char = QChar(ascii);
if (test.contains(char, Qt::CaseSensitive) ...
}

For example, test includes the hex code: 92.
It is never detected.
Why ?

Thank you for your help

SGaist

Hi,

Can you provide a sample QString for your test variable ?

Paul Colby

Worked for me :)

    QString test = QString::fromLatin1("\x80 abc \x90 xyz \xA0");
    QChar chr;
    for (int ascii = 128; ascii <= 255; ascii++)
    {
        chr = QChar(ascii);
        if (test.contains(chr, Qt::CaseSensitive)) {
            qDebug() << "found" << chr;
        }
    }

Output:

found '00\u0080'
found '00\u0090'
found '00\u00a0'

Just paraphrasing @SGaist, how are you setting the test variable?

Cheers.

VRonin

The code looks correct...
try with:

if(std::any_of(test.constBegin(),test.constEnd(),[](const QChar& c)->bool{return c.unicode() > 127;})){
qDebug() << "found > 127";
}

P.S.
QChar char; is invalid. char is reserved, you cannot use it as a variable name

kshegunov

What about this:

bool hasLarger = false;
QString heystack;
for (QString::ConstIterator i = heystack.constBegin(), end = heystack.constEnd(); i != end; ++i)  { //< Use C++11 range-based if you want
    if (i->unicode() > 127)  {
        hasLarger = true;
        break;
    }
}

It's practically the same as @VRonin suggested, but the STL is so, so incredibly ugly ...

mulfycrowh

First of all, I generate a QByteArray (m_commandFileContent) from a file:

// read the command file
void Command::readCommandFile()
{
	QFile file(m_commandFile);
	file.open(QIODevice::ReadOnly);
	m_commandFileContent = file.readAll();
	file.close();
}

// accessor to m_commandFileContent
QString Command::getCommandFileContent()
{
	return QString(m_commandFileContent);
}

The accessor is used to get the QString.
Then I apply the tool to search for ASCII code greater than 127:

bool Tools::searchIncoherentAscii(const QString &content)
{
	QChar ch;
	for (int ascii = 127; ascii <= 255; ascii++)
	{
		ch = QChar(ascii);
		if (content.contains(ch, Qt::CaseInsensitive)) return true;
	}
	return false;
}

I made a hardcopy as jpg of the 32 first bytes of the file but I don't know how to paste it here

mulfycrowh

When I drag over content in debug mode in VS, I get this:

...
[29] 102 'f'
[30] 102 'f'
[31] 65533 'white losange including "?"'

Hexa editor for [31] gives 92

VRonin

can you post the content of m_commandFile? is it a text or binary file? I think you are doing serialisation wrong. return QString(m_commandFileContent); smells a lot

mulfycrowh

How can I post the content of the file ?

VRonin

We just want to understand what's in that file. is it a .txt file containing text, is it a binary file (image, document, etc)?

mulfycrowh

Here is the start of the file:

@Comt = Based on
L : Litolff’s / 1880
B : Breitkopf / 1890
P : Peters / 1892

The trouble is the character ' after Litolff

mulfycrowh

It's a text file with CR and LF (0d 0a) at the end of each line

kshegunov

@mulfycrowh
If you have a text file, then read it as a text file! Why are all those shenanigans even needed?

QFile file("C:/path/to/file");
if (!file.open(QFile::ReadOnly | QFile::Text)) //< Open as text file so you get CL/LF conversions properly
    ; //< Can't open file, handle accordingly

QTextStream in(&file);
while (!in.atEnd())  {
    QString line = in.readLine();
    // ... do something with he line ...
}

mulfycrowh

At the very beginning, I read it as a text file. The problem was that I got LF instead CR LF and I need CR LF to rewrite the file content into another file

kshegunov

@mulfycrowh
That's because there are line ending conversions done depending on the OS. It's not a problem!
You read it as a text file, and you get "\n" where the newline is. When you write it as a text file "\r\n" will be written wherever there's "\n". That's the difference between text and binary files.

mulfycrowh

The trouble is that the file I write to is binary because I append text files and binary files

mulfycrowh

It runs if I use this:

bool Tools::searchIncoherentAscii(const QString &content)
{
	int j;
	for (int i = 0; i < content.length(); i++)
	{
		j = content.at(i).unicode();
		if ( j > 127) return true;
	}

VRonin

@mulfycrowh said:

The problem was that I got LF instead CR LF and I need CR LF to rewrite the file content into another file

use QString::replace("\n","\r\n");

mulfycrowh

@VRonin Many thanks for your help. I sent you a private message onto your mailbox about another subject. Could you please have a look ?