Searching a QString inside another QString (not using string literals)

Hi everyone, I'm new to this forum (but not to QT programming).
I'm facing this problem: I wanto to check if a particular string is contained in another string. If I do:

Code:

---

QString temp = "hello world, hello every one";
bool a = temp.contains("hello world");
//now bool is true

---

If I do:

Code:

---

QString temp = "hello world, hello every one";
QString match = "hello world";
bool a = temp.contains(match);
//bool is ALWAYS false

---

It seems that QString::contains() or QString::startsWith() and so on work only with string literals. Same results if I try to create a QRegExp. If I create it with a string literal it works, otherwise it doesn't. Same thing with QStringMatcher.

Any suggestion on how to avoid a string search char by char? Is it normal that such an important QT module works only with literals?

Thanks,
ShaoLin

---

Added after 38 minutes:

Solved using:

Code:

---

(temp.toStdString().find(biggerFile.toStdString()) >= 0)

---

that is standard c++ string pattern matching. Anyway, is there a QT solution for this kind of problem?

Thx,
ShaoLin

check: QString::indexOf

Same thing. Maybe the problem is that tha string to be matched has a blank space inside, it's made by 2 words..

edit: yes, I found that the problem doesn't appear if I search for a single word. Any ideas?

Hm, works fine on my machine. Maybe you can try to use the QString constructor instead of using the auto convert function of Qt. Try:

Code:

---

int main(int argc, char *argv[])
{
    QString temp = QString("hello world, hello every one");
    QString match = QString("hello world");
    qWarning() << temp.contains(match);
 
    return 0;
}

---

Nothing..
The problem is that I build my string from a previous one:

Code:

---

....//some code
biggerFile.replace("_", " ");
//now bigger file contains spaces instead of underscores and it always fails the check
//now I try
QString matcher = QString(biggerFile);
//it again fails the comparison. I can't build the string with a literal..

---

edit: I also tried with a new() and a pointer, but nothing..

I'm pretty sure that you have strip the problem and we don't see what source of your problem.
Test with code you have given at beginning are passing fine!

I suspect that your real code is using some different language (not English) and your problem is in fact problem of conversion from c-string to unicode (used in QString).
So please show us your real code not its translation to English!
Check also QTextCodec::setCodecForCStrings.

The strings I'm handling are just file names, and I have to check if a given file name contains a certain substring, so it's indipendent from language locale I suppose..

Quote:

---

Originally Posted by shaolin

so it's indipendent from language locale I suppose..

---

I don't think so. On my computer I can name files like

• blödsinn.txt
• טיפשות.txt
• 废话.txt

so the local can be important. On which environment you are facing that problem.

Oh yes you are right, I was meaning european alphabet. Anyway it works perfectly, there was a really stupid but subtle error, and so the comparison used to fail..

Sorry :o

Thanks to evryone guys!