How can i Write a new text without losing the previous value
QString mFilename2 = "bin/bin_2.txt";
File_main_Editor.stWrite(mFilename2,okline_Edit);
void stWrite(QString Filename,QString stringtext){
QFile mFile(Filename);
if(!mFile.open(QIODevice::WriteOnly | QIODevice::Text))
{
QMessageBox message_file_Write;
message_file_Write.warning(0,"Open Error"
,"could not to open file for Writing");
return;
}
QTextStream out(&mFile);
out << stringtext;
out.setCodec("UTF-8");
mFile.flush();
mFile.close();
}
Every time that okline_Edit is initialized
stWrite function called a new value in the file is poured .txt previous value is lost.
Or in other words
You need to set QIODevice::Append when you open() the file.
mFile.open(QIODevice::WriteOnly | QIODevice::Append | QIODevice::Text)
Additionally, if you want each append to be on a new line, you will have to insert a \n as well.
You open file with QIODevice::WriteOnly that would start writing...well from start, you need to open it with QIODevice::Append
Related
I've got a path like "C:\Users\Rick\html.txt". So how can I separate the file path and filename? My main aim is to extract the file path and obtain "C:\Users\Rick" for a text editor app. I'm receiving the path as a QString from QFileDialog::getSaveFileName(). So I want to use that path as the window title and next path if the user tries to open a file
if(!checkTextField()){
QMessageBox::StandardButton reply = QMessageBox::question(this,this->appName,this->document_modified);
if(reply == QMessageBox::Yes){
QString filename = QFileDialog::getSaveFileName(this,"Save the File",QDir::homePath(),this->textFilter);
QFile file(filename);
if(!file.open(QIODevice::ReadWrite | QIODevice::Text))
return;
QTextStream out(&file);
QString text = ui->textEdit->toPlainText();
out << text;
file.flush();
file.close();
}
}```
You should look in to QFileInfo
QFileInfo info("c:/my/path/to/dir/file.txt");
info1.absoluteFilePath(); // returns "c:/my/path/to/dir/file.txt"
info1.dir(); // returns "c:/my/path/to/dir"
info1.filename(); // returns "file.txt"
I am reading a .txt file, I want to read only 1 line with particular word. I'm using Qt Creator.
How can I achieve this?
This is my code so far:
QFile file("/home/a1.txt");
if (!file.open(QFile::ReadOnly | QFile::Text)) {
QMessageBox::warning(this,"title","file not open");
}
QTextStream in(&file);
QString text = in.readAll();
ui->plainTextEdit->setPlainText(text);
file.close();
If you want to search all lines for a specific word you can do this
QFile file("/home/a1.txt");
if (!file.open(QFile::ReadOnly | QFile::Text)) {
QMessageBox::warning(this,"title","file not open");
}
QTextStream in(&file);
QString text;
while (!in.atEnd()) {
text = in.readLine();
if (text.contains(/*Search her for the word you want.*/))
break;
}
ui->plainTextEdit->setPlainText(text);
file.close();
So you loop through all lines. And in every line you check if the word exist. If yes you can stop searching and leave the loop.
I hope this helps!
I want to put in a label the direction of the file then click a button and open it in another label :
QFile file("/Users/Ignacio/Documents/3 curso/segundo semestre/cafeteria-2/txt/HEREGOESTHEFILE.txt");
if(!file.open(QIODevice::ReadOnly))
QMessageBox::information(0,"info",file.errorString());
QTextStream in (&file);
ui->cajagrande->setText(in.readAll());
So I tried something like this
Char a [] = ui->label->text();
QFile file(a);
if(!file.open(QIODevice::ReadOnly))
QMessageBox::information(0,"info",file.errorString());
QTextStream in (&file);
ui->cajagrande->setText(in.readAll());
but it dosen't work.
Thanks for the help
Be careful that you were using the file even on errors, place braces correctly as well as the else clause.
QFile file(ui->label->text());
if(!file.open(QIODevice::ReadOnly)) {
QMessageBox::information(0, "info", file.errorString());
} else {
QTextStream in(&file);
ui->cajagrande->setText(in.readAll());
}
Note: a QFile can be open directly with a filename given as QString, no need to converting to a pointer of chars.
I want to change the name of my file but I don't know how to do it. I have a .txt with words in two lines,and like to take the first line same as name of my file .txt.
This is my code:
void ventana1::on_ButtonGuardar_clicked()
{
QDir directory("C:/Users/Jaime/Desktop/interfaz/pacientes");
QString mFilename = directory.filePath("paciente.txt");
QFile sFile(mFilename);
if(sFile.open(QFile::WriteOnly | QFile::Text))
{
QTextStream out(&sFile);
out << ui.lineEdit_2->text()<< "\n"
<< ui.lineEdit->text();
sFile.flush();
sFile.close();
}
}
Simply replace
QString mFilename = directory.filePath("paciente.txt");
by
QString mFilename = directory.filePath(ui.lineEdit_2->text());
if you need to have the content of your lineEdit as your filename.
I have a task to save a file to computer. So this is my problem, when i write to file , it writes hex values.. I have no clue, what's wrong with my code. Here it is:
void MainWindow::on_actionSave_triggered()
{
QString filename = QFileDialog::getSaveFileName(
this,
tr("Save Document"),
QDir::currentPath(),
tr("Documents (*.txt)") );
QFile f( filename );
f.open( QIODevice::WriteOnly | QIODevice::Text );
QTextStream out(&f);
out << ui->textEdit->document();
}
QTextEdit's document method return QTextDocument, I think you want to use toPlainText method instead.
QTextEdit::document() will return a QTextDocument* which will be an Hex value (address). That's what you are adding in the file.
To get the contents from the QTextEdit use QString QTextEdit::toPlainText ()
HTH..