<![CDATA[QImageReader struggles with some paths]]>Hi,

I'm using a QImageReader to get the image info.
A path to a png ending with the following string works:

/photo/test/Hatsune Miku Project DIVA F_10.png

But the same path with a colon doesn't

/photo/test/Hatsune Miku: Project DIVA F_10.png

The QImageReader::canRead() function returns false and the errorString() returns "File not found".

Is there some way around this?

]]>https://forum.qt.io/topic/138264/qimagereader-struggles-with-some-pathsRSS for NodeTue, 22 Sep 2026 17:27:43 GMTFri, 29 Jul 2022 17:24:34 GMT60<![CDATA[Reply to QImageReader struggles with some paths on Fri, 29 Jul 2022 18:44:53 GMT]]>@Megamouse

Turns out the original path has a FULLWIDTH COLON, while the other one converts it to a regular colon.

...which is exactly what the stackoverflow solution talks about...

]]>https://forum.qt.io/post/723264https://forum.qt.io/post/723264Fri, 29 Jul 2022 18:44:53 GMT<![CDATA[Reply to QImageReader struggles with some paths on Fri, 29 Jul 2022 18:43:18 GMT]]>Yes. I just did.
Turns out the original path has a FULLWIDTH COLON, while the other one converts it to a regular colon.
The QImageReader thus can't find the file.

]]>https://forum.qt.io/post/723263https://forum.qt.io/post/723263Fri, 29 Jul 2022 18:43:18 GMT<![CDATA[Reply to QImageReader struggles with some paths on Fri, 29 Jul 2022 18:43:02 GMT]]>@Megamouse
I would check again your understanding that your Windows filename contains an embedded : character.

For example, try to create such a filename yourself, from a program or Explorer or whatever.

Have a read of e.g. https://stackoverflow.com/questions/10386344/how-to-get-a-file-in-windows-with-a-colon-in-the-filename. Could the solution there be relevant to your situation, could it actually be a :-looking character which is not a :?

]]>https://forum.qt.io/post/723262https://forum.qt.io/post/723262Fri, 29 Jul 2022 18:43:02 GMT<![CDATA[Reply to QImageReader struggles with some paths on Fri, 29 Jul 2022 18:37:03 GMT]]>Did you try to compare the content at the lowest level ?

]]>https://forum.qt.io/post/723261https://forum.qt.io/post/723261Fri, 29 Jul 2022 18:37:03 GMT<![CDATA[Reply to QImageReader struggles with some paths on Fri, 29 Jul 2022 18:24:36 GMT]]>@SGaist said in QImageReader struggles with some paths:

How do you get the one that is a std::string ?

It's also not working if the path was created as QString in the first place.
Maybe there's some hidden stuff in QString coming from QFileDialog?

The path comes from regular c++ directory scan

]]>https://forum.qt.io/post/723259https://forum.qt.io/post/723259Fri, 29 Jul 2022 18:24:36 GMT<![CDATA[Reply to QImageReader struggles with some paths on Fri, 29 Jul 2022 18:24:31 GMT]]>@Megamouse
If you are on Windows how is either of those a legal pathname? [To be clear: Windows doesn't allow : in pathnames.] I don't know about why stdString makes any difference to the result regardless.

]]>https://forum.qt.io/post/723257https://forum.qt.io/post/723257Fri, 29 Jul 2022 18:24:31 GMT<![CDATA[Reply to QImageReader struggles with some paths on Fri, 29 Jul 2022 18:18:49 GMT]]>I'm on Windows 11.

This is the log:

QString                "C:/Users/Megamouse/Pictures/Hatsune Miku: Project DIVA F_10.png"    canRead true
QString::fromStdString "C:/Users/Megamouse/Pictures/Hatsune Miku: Project DIVA F_10.png"    canRead false
]]>https://forum.qt.io/post/723255https://forum.qt.io/post/723255Fri, 29 Jul 2022 18:18:49 GMT<![CDATA[Reply to QImageReader struggles with some paths on Fri, 29 Jul 2022 18:18:42 GMT]]>Hi,

How do you get the one that is a std::string ?

]]>https://forum.qt.io/post/723254https://forum.qt.io/post/723254Fri, 29 Jul 2022 18:18:42 GMT<![CDATA[Reply to QImageReader struggles with some paths on Fri, 29 Jul 2022 18:15:35 GMT]]>It works if I get the QString from a QFileDialog, even though the QString is identical to the one i got as std::string, converted with QString::fromStdString();

]]>https://forum.qt.io/post/723253https://forum.qt.io/post/723253Fri, 29 Jul 2022 18:15:35 GMT<![CDATA[Reply to QImageReader struggles with some paths on Fri, 29 Jul 2022 17:51:33 GMT]]>@Megamouse
What platform is this on?

]]>https://forum.qt.io/post/723252https://forum.qt.io/post/723252Fri, 29 Jul 2022 17:51:33 GMT