[Qt-interest] SOLVED QImageReader cannot detect image format

[Guido Seifert]

> That would be odd, since the only thing 
> QImageReader::imageFormat(const
> QString &fileName) does with the filename you pass to it is to 
> create a QFile with it (in Qt 4.6.2 at least).  Since QFile takes 
> absolute filepaths, so does QImageReader::imageFormat.

Yeah, really odd. Especially since the Trolls are quite good when it comes to reusing things like that. 

> Why don't you show us the line of code that isn't working, and 
> the types and values of any variables used on that line?

Can't. I am at home now. And naturally on my personal machines it works. I should stop reporting things I experience on my work computer. Too many strange things happen there. 

>  Are you sure you have permission to read the file?  Does directly 
> passing that same file name to QFile fail too?

Quite sure. It did not work till I did this:

QString currPath = QDir::currentPath();
QDir::setCurrent (FileHandling::temporaryDir());
QString imageFormat = QImageReader::imageFormat (filename);
QDir::setCurrent(currPath);
                
Before that I just did:
QString path =  FileHandling::temporaryDir()+filename;
QString imageFormat = QImageReader::imageFormat(path);

And yes, I checked path. It was fine. No forgotten '/'.

And no, I tested with QFile and QImage. It worked. Permissions were fine, too. Else I would not have called it 'sick'. ;-)

Nevertheless, I have a workaround. Till Monday no access to my work computer and even then no time to figure out, what or great admins did to our system. 

Guido




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