Open function in Qt - c++

Question

I have been creating an application in qt. I have added open function in it, but was happening that when I open an already open file, it again opens the same file instead of pointing it to already opened file.
void MainWindow::actionOpen()
{
QFileInfo fileInfo = UIUtils::openFile(this);
if (!fileInfo.exists()) {
return;
}
if (!MainWindow::mdiMode && !maybeSave()) {
return;
}
openFile(fileInfo.filePath());
}
Please help me to solve the problem.

Answer 1

I'm not 100 % clear on what the issue is, but if you don't want to run the openFile function on files you've previously opened, you have to keep a record.
For instance, define a QList in your header file:
QList<QFileInfo> knownFiles;
And then keep it up to date and check it:
void MainWindow::actionOpen()
{
QFileInfo fileInfo = UIUtils::openFile(this);
if (!fileInfo.exists()) {
return;
}
if (!MainWindow::mdiMode && !maybeSave()) {
return;
}
bool fileIsKnown = false;
for(qint64 i=0; i<knownFiles.length(); i++)
if(knownFiles.at(i) == fileInfo)
{
fileIsKnown = true;
break;
}
if(!fileIsKnown)
{
knownFiles << fileInfo;
openFile(fileInfo.filePath());
}
}
I don't know what you mean when you say "instead of pointing it to already opened file.".