Save a file
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i want to copy a qgraphicsview to a qpixmap and save it.
for this, i code like this:
QFileDialog fileDialog(this, "Enregistrer sous", "",
"Images (*.jpg)");
fileDialog.setAcceptMode(QFileDialog::AcceptSave);
if(fileDialog.exec() == QDialog::Accepted)
{
QString path = fileDialog.selectedFiles()[0];
QPixmap pixmap = QPixmap::grabWidget(ui->graphicsView);
QFile file(path);
file.open(QIODevice::ReadWrite);
QByteArray ba;
QBuffer buffer(&ba);
buffer.open(QIODevice::WriteOnly);
pixmap.save(&buffer, "JPG");
file.write(ba);now I can save a file in jpg mode successfully.
but there is a problem:
when I save a file, I type "myfile" and click "save", OK, a file "myfile.jpg" will be created.
but if i want to save again and I still type "myfile" and click "save", the old "myfile.jpg" will be replaced immediately. (normally a warning should popup because of "file has existed".)
if i want to get a warning, i must name my file "myfile.jpg", which means that I must type ",jpg"as we know, for a software, if we type just the name without an extension, a warning should popup if necessary. this is what i want.
can u help me???
thx in advance
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Please wrap your code in '@' tags, right now it's hard to read and analyse your code.
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first of all please use the code tags when you post code. This makes reading it a lot easier.
What system you are on? Which Qt version are you using?
What happens when you try this:
@
QString fileName = QFileDialog::getSaveFileName( this, “Enregistrer sous”, “”, “Images (*.jpg)” );
if( ! fileName.isEmpty() )
{
QPixmap pixmap = QPixmap::grabWidget(ui->graphicsView);
QFile file(fileName);
if( file.open(QIODevice::ReadWrite) )
{
QByteArray ba;
QBuffer buffer(&ba);
buffer.open(QIODevice::WriteOnly);
pixmap.save(&buffer, “JPG”);
file.write(ba);
file.close();
}
}
@ -
thx.
I got the same problem with ur code.my system: win7
my Qt: 5.0.2so this is the problem of different system or different Qt?
[quote author="raven-worx" date="1389944632"]first of all please use the code tags when you post code. This makes reading it a lot easier.
What system you are on? Which Qt version are you using?
What happens when you try this:
@
QString fileName = QFileDialog::getSaveFileName( this, “Enregistrer sous”, “”, “Images (*.jpg)” );
if( ! fileName.isEmpty() )
{
QPixmap pixmap = QPixmap::grabWidget(ui->graphicsView);
QFile file(fileName);
if( file.open(QIODevice::ReadWrite) )
{
QByteArray ba;
QBuffer buffer(&ba);
buffer.open(QIODevice::WriteOnly);
pixmap.save(&buffer, “JPG”);
file.write(ba);
file.close();
}
}
@[/quote]
