Insertion double quote into string/qstring

[jpn]

Yep, I do. Let me give you complete code:

[...]
queryString.arg(strPicPath);
[...]

[...]
queryString.arg(strPicPath);
[...]

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To me it looks you don't. Notice that QString::arg() is a const method. Again, it does not modify the original value but returns a modified value.

[MarkoSan]

I have this system everywhere in project and it works fine, just here it does not work. So, how should I rewrite the code, have you any clues?

[jpn]

I have this system everywhere in project and it works fine, just here it does not work. So, how should I rewrite the code, have you any clues?

Give yourself a moment to think it. Consider the following piece of pseudo code:

QString QString::arg(value) const
{
    // does not modify _this_ but returns a copy
    QString copy(*this);
    copy.replacePlaceHolderWithValue(value);
    return copy;
}

QString QString::arg(value) const
{
    // does not modify _this_ but returns a copy
    QString copy(*this);
    copy.replacePlaceHolderWithValue(value);
    return copy;
}

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What's the content of foo?

QString foo("%1");
foo.arg(1234);

QString foo("%1");
foo.arg(1234);

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What's the content of bar?

QString bar("%1");
bar = bar.arg(5678);

QString bar("%1");
bar = bar.arg(5678);

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[MarkoSan]

foo has 1234

and bar has 5678

Am I right?

[jpn]

foo has 1234

and bar has 5678

Am I right?

Unfortunately not (foo has "%1" and bar has "5678"). However, did you notice the difference? Looks subtle, but is in fact significant.

[MarkoSan]

Aha, I must use = operator to set right value. God damn, thanks.