Problem in running QT Application

[ChrisW67]

When a program fails to open a file that does exist, and you have specified a relative path, the odds are very good that the current working directory is not what you think it is (see QDir::currentPath()).

You can obtain the location of the program executable using QCoreApplication::applicationDirPath() and build a path to the file that way.
You can embed images in the executable using the resource system.

It's also possible the image cannot load because a suitable image format plugin is not available (should not be the case with PNG).

[beginQT]

Now, I have taken the current dir path..still same no results yet. This is what i am doing:

filename = QDir::currentPath();
imgLoaded = img.load(filename +"/PICS/Car_New1.PNG" );

if(true == imgLoaded)
{
_sPic.iId = this->bindTexture(img, GL_TEXTURE_2D, GL_RGB);
_sPic.iHeight = img.height();
_sPic.iWidth = img.width();
}

And, I have added this png in QRC file too its been embeded in Executables also but i dont know how to use this to map to our current context.

Thanks!

[ChrisW67]

You seem to have missed the point. What is the value of currentPath()? Is it where you think it is? The current directory can be anywhere on the system and has nothing to do with the location of the program executable.

The Qt Resource System

[beginQT]

I have seen some QT open gl Texture examples and I am also doing the same thing almost. But i dont understand why it doesn't work for me - may be I am doing some basic mistake which I am not able to uncover.

How would I solve it? I dont have any clue about the problem!
Would it going to help me if I place whole code?

Thanks!

[ChrisW67]

I have already told you the most likely thing that is going wrong.

Qt can only open the file if the file is where you tell Qt it is. If you are using a relative path then the file will be looked for relative to the current working directory of the running process, which can move around as the program runs. This is not generally the same as the directory containing the program executable. Unless you know the actual current working directory then you cannot know whether you are trying to open the file you think you are.

You can use the Qt resource system to embed the image into your executable (if that meets your needs) so that it can always be found. I have already provided a linking detailing how this is used.