I am using Qt Designer 4.8.4 and I include two files in the QMainWindow resource file: a .ico file and a .gif file. When loading from code using:
QPixmap p;
p.load(":/MyApp/media/logo.gif"); // does work
p.load(":/MyApp/media/logo.ico"); // does not work
The gif file works, but not the ico file. Is there any reason? I am using the ico file as the window icon and it is not showing when running the application.
And, YES, I am successfully compiling the qrc file since the GIF file is working.
Cheers,
*.ico is not supported.
By default, Qt supports the following formats:
Format Description Qt's support
BMP Windows Bitmap Read/write
GIF Graphic Interchange Format (optional) Read
JPG Joint Photographic Experts Group Read/write
JPEG Joint Photographic Experts Group Read/write
PNG Portable Network Graphics Read/write
PBM Portable Bitmap Read
PGM Portable Graymap Read
PPM Portable Pixmap Read/write
TIFF Tagged Image File Format Read/write
XBM X11 Bitmap Read/write
XPM X11 Pixmap Read/write
Because QPixmap Cant read .ico files simply,
take a look at documentation QPixmap if you want to know more about formats supported
you can convert it's format to Qt supported formats.
The accepted answer here is incorrect, or as mentioned in the comments, at least misleading. Qt has come with a plugin for handling ICO format since sometime in version 4.4. Here's a similar question from the same era.
For deployment, one needs to copy the plugins/imageformats/[lib]qico.[dll|so] file from the Qt installation used for building with to within their executable's directory. Put it in a subfolder, like so: <your_executable>/imageformats/qico.dll. If testing a debug build, the d suffix version of the lib is needed instead (qicod.dll).
(This newer question has been marked as a duplicate of this, so now 2 questions point to the wrong answer. Which is why I'm essentially repeating my post here.)
Guessing from your followup on the already chosen answer, you may want to have that ICO as the appwindow icon. That is possible, and also is perhaps why Qt Designer is capable of displaying it (trying to guess your intent). However, having it so doesn't involve any QPixmap coding, it's purely configuration affair. Described here (and yes, #worksforme) :
http://doc.qt.digia.com/qt/appicon.html
