Hello to everyone, im trying to read full text files line by line using QByteArray. It does work but it only reads half of the text file. I have text files that have thousands of lines, but QByteArray dosent read all the lines, only a few. I've managed to read large files but using QByteArray only shows half of the file.. My code snippet is below... Thanks //your code here QByteArray data; data.reserve(5000000); if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) { //QMessageBox::warning(this,"...","error in opening keyword file"); return; } else { if (fileExt == "txt") { data = file.read(file.size()); fileLine.append(data); *fileList = fileLine.split(QRegExp("[\r\n]"), QString::SkipEmptyParts); if(fileList->size() >1000) { QMessageBox::warning(this, "...", "Max keyword list size: 1000"); } else { ui->lineEdit_Keyword_List_File_Location->setText(file.fileName()); for (int i = 0; i <fileList->size(); i++) { options[4]->keywordLoadListOptions[fileList->at(i)] = 0; } } }

hi @ tshoats , processEvents() is a crutch, you should avoid it. if reading your file lasts more then a few milliseconds, you have two options: use a QTimer with small timeout and read some lines from the file in the slot. when the timer fires again, read the next lines. put the whole file reading in a thread both will keep your app responsive and you can even have a progress bar. just my two cent regards

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How to make QByteArray read Full Text file?

Solved General and Desktop

21 Posts 8 Posters 15.8k Views 3 Watching

S stokito

Java has Files.readFileContent() and even Files.readAllLines(), similar .NET has File.ReadAllText(). Why does the QT/CPP doesn't provide a simple way to do this?
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@stokito said in How to make QByteArray read Full Text file?:

Java has Files.readFileContent() and even Files.readAllLines(), similar .NET has File.ReadAllText(). Why does the QT/CPP doesn't provide a simple way to do this?

Hi,

It has: QFile::readAll.
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