0
的Windows 7 SP1
MSVS 2010
的Qt 4.8.4
为什么select（QTextCursor :: BlockUnderCursor）包含额外的垃圾字符？
我使用QTextCursor抓住每个块的文本。我使用select(QTextCursor::BlockUnderCursor)来抓取文本，然后用movePosition(QTextCursor::NextBlock)转到下一个块。但是当我再次select(QTextCursor::BlockUnderCursor)我得到一个额外的垃圾字符在QString和锚已移动到前一个块的结尾。
使用本作的text.txt：
A
B
此代码的注释通过发行散步和提出的问题：
#include <QTGui>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QMainWindow* window = new QMainWindow;
QTextEdit* editor = new QTextEdit(window);
QTextDocument* document = new QTextDocument(window);
editor->setDocument(document);
QFile file("test.txt");
if (file.open(QFile::ReadOnly | QFile::Text))
editor->setPlainText(file.readAll());
QTextBlock block = document->begin();
QTextCursor* cursor = new QTextCursor(document);
int pos = cursor->position(); // = 0
int anchor = cursor->anchor(); // = 0
cursor->select(QTextCursor::BlockUnderCursor);
pos = cursor->position(); // = 1
anchor = cursor->anchor(); // = 0
QString text = cursor->selectedText(); // = "A"
int size = text.size(); // = 1
cursor->movePosition(QTextCursor::NextBlock);
pos = cursor->position(); // = 2
anchor = cursor->anchor(); // = 2
cursor->select(QTextCursor::BlockUnderCursor);
pos = cursor->position(); // = 3
anchor = cursor->anchor(); // = 1 Why not 2?
text = cursor->selectedText(); // "B" in debugger
// but text.at(0) = junk & test.at(1) = "B"
size = text.size(); // = 2 Why? Why not 1?
return app.exec();
}