Large Qt external binary resource file

问题

I want to use a Qt external resource file as an expansion file for my Android app. The total size of the resource to be bundled in the resource file is 700+ MB. I have experienced that the resource compiler (rcc) can not handle more than about 500MB before it hangs and crash on my computer. I would really want to make on big file as this makes it a lot easier when uploading expansion files for Android.

I run the rcc tool from the commandline with the following arguments:

rcc -binary -no-compression myQrcFile.qrc -o myOutputFile

I need to use no compression to be able to play video files bundled in the resource file directly, but this is not a problem here.

I have two questions, but the first one is the primary one:

Is there some way to bundle files with a total file size of more than 500MB in one file?
Does the size of an external Qt resource file have an impact on the performance of the application? Larger file = slow load or similar?

回答1:

For creating a smaller resource data, you may try to change the compression (s, -compress)

For the faster loading, there seems to be two possibilities to embedd the resources in Qt.

Unless you specify explicitly to create the resources-data as an external library, the resource data is embedded in the executable and will be loaded at the application start (make sense for app-icons, fonts, etc)

If you compile the data with the -binary option

rcc -binary myresource.qrc -o myresource.rcc

you'll build the data into a dynamic library, which you may load at a later point than the application-start with the call

QResource::registerResource("/path/to/myresource.rcc");

Here is a similar quistion on SO, which however is focused on dynamic loading of resources, no on the size: How can I embed a Qt resource into a .dll file?

These links should be helpful: