Trouble with resolution

[Xaar]

1. How can I change resolution using QT4? A simple example will be appreciated. I must use Windows\Linux functions or is another way to do this?

2. I have "QImage *image" and I do:

image = new QImage("../Images/bMMenu.jpg");
if( image->isNull() ){
QMessageBox::about(this, tr("ERROR"),
tr(" I can't find bMMenu.jpg"));
}

and when I compile \ run program everything is OK. The image is painted od Widget. When move everthing to another directory it works too. But when I copy files to another computer image->isNull() return true and of course I have black screen. I don't understand what I do wrong? On one computer everuthing is OK, simple Copy->Paste to another and it didn't work

Second computer is without QT. I copy also DLL's.

[jacek]

1. How can I change resolution using QT4? A simple example will be appreciated. I must use Windows\Linux functions or is another way to do this?

Do you mean the display's resolution?

But when I copy files to another computer image->isNull() return true and of course I have black screen.

You have to copy the QJPEG plugin too (it should be in the imageformats subdirectory of the directory where your executable is).

[Xaar]

Do you mean the display's resolution?

Yes. I call QWidget::showFullScreen() and I want to set also resolution.

You have to copy the QJPEG plugin too (it should be in the imageformats subdirectory of the directory where your executable is).

It didn't help.

[jacek]

Yes. I call QWidget::showFullScreen() and I want to set also resolution.

I haven't seen any function in Qt that would allow you to do that, so probably you will have to do that using some platform-dependent code.

It didn't help.

Hmmm... but it should, at least for JPEG files. Which file did you copy and where?

[Xaar]

Hmmm... but it should, at least for JPEG files. Which file did you copy and where?

I copy qjpeg1.dll and qjpegd1.dll to directory where i have exe file.

[jacek]

I copy qjpeg1.dll and qjpegd1.dll to directory where i have exe file.

OK, then create imageformats subdirectory and move those DLL there (qjpegd1.dll is a debugging version of the plugin, so you probably don't need it).

[Xaar]

OK, then create imageformats subdirectory and move those DLL there (qjpegd1.dll is a debugging version of the plugin, so you probably don't need it).

This is what I need. Big thanks