从文件中用QString填充一些QTableWidgetItems [英] Filling some QTableWidgetItems with QString from file
问题描述
我正在尝试从程序导出的文件中填充QTableWidget,但是当我尝试将文本设置为表格单元格时,它们只是忽略了我,所以什么也没发生.
I'm trying to fill a QTableWidget from a file that was exported by my program, but when I try to set text to the table cells they just ignore me, nothing happens.
void MainWindow::on_actionOpen_Project_triggered()
{
QString line, fileName;
fileName = QFileDialog::getOpenFileName(this,tr("Open Project"), "", tr("Project Files (*.project)"));
if(!fileName.isEmpty()){
QFile file(fileName);
if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) return;
QTextStream in(&file);
for(int i=0;i<ui->code->rowCount();i++){ // goes through table rows
for(int j=0;j<ui->code->columnCount();j++){ // through table columns
ui->code->setCurrentCell(i,j);
QTableWidgetItem *cell = ui->code->currentItem();
in >> line;
if(!line.isEmpty()){
cell = new QTableWidgetItem(line); // relates the pointer to a new object, because the table is empty.
ui->errorlog->append(line); // just for checking if the string is correct visually.
}
}
}
file.close();
}
}
错误日志对象在屏幕上显示了从文件打开的正确值,但是未填充表格.发现任何问题吗?
The errorlog object shows on the screen the correct values opened from the file, however the table is not filled. Any problems found?
推荐答案
此行:
cell = new QTableWidgetItem(line);
不执行您认为的操作.分配cell
不会更改表中的任何内容– cell
只是一个局部变量,覆盖它在其他地方没有任何作用.
doesn't do what you think it does. Assigning the cell
doesn't change anything in the table – cell
is just a local variable, overwriting it doesn't have any effect elsewhere.
您(可能)想做这样的事情:
You (probably) want to do something like this instead:
cell->setText(line);
或者(如果您确实不需要更改当前项目):
Or (if you don't really need to change the current item):
ui->code->item(i,j)->setText(line);
如果这些给您一个段错误,则表明您尚未设置表的窗口小部件项.在这种情况下,您应该执行以下操作:
If those give you a segfault, it's that you haven't set the table's widget items yet. In that case, you should do something like:
QTableWidgetItem *cell = ui->code->item(i,j);
if (!cell) {
cell = new QTableWidgetItem;
ui->code->setItem(i,j,cell);
}
if (!line.isEmpty()) {
cell->setText(line);
}
这将在第一次调用此函数时用QTableWidgetItem
填充所有单元格,并随后重用它们.
This will populate all the cells with QTableWidgetItem
s the first time this function is called, and reuse them subsequently.
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