Background image is missing after adding dlls

[Lazaruspl]

Hi,
I have application and there in MainWindow I set some background image:

QPixmap bg("./images/Background.jpg");
 QPalette p(palette());
 p.setBrush(QPalette::Background, bg);
 setAutoFillBackground(true);
 setPalette(p);

QPixmap bg("./images/Background.jpg");
 QPalette p(palette());
 p.setBrush(QPalette::Background, bg);
 setAutoFillBackground(true);
 setPalette(p);

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I can also do that using styles, and I can also do that using resource files. But in all those cases there is a problem. When I start application from Qt creator everything is ok. It is displaying image in background without a problem. But when I add those dlls to application folder:
mingwm10.dll
QtCore4.dll
QtGui4.dll
and I start application, background image is missing. My window icon is also not working while it was ok when I run app from Qt creator without those dlls.
I've tried adding image formats dlls to folder but unfortunately without effect. I've also tried adding them to \imageformats\ folder witch I created in application folder.

Maybe I do something wrong, I don't know. I would appreciate if someone could give me simple app, just MainWindow without anything other, that has got image background, witch is loaded in constructor and is working. Then I would compare code of that application with mine and maybe that could help.

I'm using Qt Creator 1.2.1 Based on Qt 4.5.2 (32 bit). My OS is Windows 7 professional 64bit. But the same problem I had on Vista 32bit.

[high_flyer]

try adding your ./images/ folder to the folder where your exe is. (but leave it in its original place as well)

[Lazaruspl]

I've tried, without effect. Can you give me simple code with working background?

[high_flyer]

you wrote that the code works if you start it in the IDE,so its not a code problem.
Its very likely a path problem.
Put absolute path instead of the relative and see if it works then.
I would recommend to use a resources file (qrc), it makes resource management much simpler.

[Lazaruspl]

Hmmm I've tried putting absolute path, but it's not working. I'll show you what happens:
Starting from IDE without dlls in folder:
http://i47.tinypic.com/333hksj.jpg
Background was added like I post in the beggining. I just change path to absolute path:

QPixmap bg("D:/Programowanie/QtNewProjects/KsiazkaKucharska/release/images/Background.jpg");
    QPalette p(palette());
    p.setBrush(QPalette::Background, bg);
    setAutoFillBackground(true);
    setPalette(p);

QPixmap bg("D:/Programowanie/QtNewProjects/KsiazkaKucharska/release/images/Background.jpg");
    QPalette p(palette());
    p.setBrush(QPalette::Background, bg);
    setAutoFillBackground(true);
    setPalette(p);

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The same effect is when I delete this code above and load image from resource file.

Now starting from IDE with dlls in folder, and loading image from absolute path:
http://i45.tinypic.com/2qc3riu.jpg

Now starting from IDE with dlls in folder, and loading image from resource file:
http://i48.tinypic.com/1177fdg.jpg

[squidge]

Maybe your problem is that it can't find the jpeg plugin? Do you have plugins directory with imageformats beneath that?

[Lazaruspl]

In application folder I add folder named imageformats, and there I add files:
qgif4.dll
qico4.dll
qjpeg4.dll
qmng4.dll
qsvg4.dll
qtiff4.dll

Is that what you are talking about?

In function "main" uder line:

QApplication a(argc, argv);

QApplication a(argc, argv);

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I also tried to add this:

QString myPath;
 myPath = "./imageformats";
 a.addLibraryPath(myPath);

QString myPath;
 myPath = "./imageformats";
 a.addLibraryPath(myPath);

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Without effect.

[Lazaruspl]

I think I know what is going on. When I start application having dlls in folder I can't delete them becouse application is using them, however I can delete image dlls when program is running so it's probably not loading them. How can I force application to load those image dlls?

[squidge]

Try putting them in plugins/imageformats. Ie, a sub-dir within plugins dir as I said above.

[Lazaruspl]

Unfortunately no effect

[Lazaruspl]

I know what's the problem:
QImageReader::supportedImageFormats () returns: bmp gif ico jpeg jpg mng pbm pgm png ppm svg tif tiff xbm xpm
While app is run without dlls. And bmp pbm pgm png ppm xbm xpm, when I run application with dlls.
Those formats f.e. png are good with and without dlls and I finally have my background. But does anybody know why I have problems with others? I would like to have program icon, and without ico format it's hard.