Problem in Moving QTextCursor to the End

I'm trying to implement a simple text search in an editor i'm writing. Everything have been fine until this problem! I'm trying to implement a backward search here. The procedure is: look for the subject backward, if not found, beep once, and if find button 开发者_如何学JAVAwas pressed again, go to the end of the document, and do the search again. "reachedEnd" is an int, defined as a private member of the editor class. Here's the function that does the backward search.

void TextEditor::findPrevPressed() {
    QTextDocument *document = curTextPage()->document();
    QTextCursor    cursor   = curTextPage()->textCursor();

    QString find=findInput->text(), replace=replaceInput->text();


    if (!cursor.isNull()) {
        curTextPage()->setTextCursor(cursor);
        reachedEnd = 0;
    }
    else {
        if(!reachedEnd) {
            QApplication::beep();
            reachedEnd = 1;
        }
        else {
            reachedEnd = 0;
            cursor.movePosition(QTextCursor::End);
            curTextPage()->setTextCursor(cursor);
            findPrevPressed();
        }
    }
}

The problem is that cursor doesn't move to the end! And it returns False, which means failure. How can this fail?!! Thanks in advance.

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Since this question got some views and it appears to be a common problem, I think it deserves an answer (even though the author most surely figured it out).

From the documentation:

QTextCursor QPlainTextEdit::textCursor() const
Returns a copy of the QTextCursor that represents the currently visible cursor. Note that changes on the returned cursor do not affect QPlainTextEdit's cursor; use setTextCursor() to update the visible cursor.

So you got a copy of it and by doing cursor.movePosition(QTextCursor::End); it wouldn't work.

What I did is:

QTextCursor newCursor = new QTextCursor(document);
newCursor.movePosition(QTextCursor::End);
curTextPage()->setTextCursor(newCursor);

---

If I simplify your code like this:

if (!cursor.isNull()) {
   // (...)
}
else {
    // (...)
    cursor.movePosition(QTextCursor::End);
    // (...)
}

...I see that you call the movePosition() function while the cursor.isNull() condition is true. Maybe this is the reason it doesn't work...