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In general, there are two steps to switch to iframe. The first step is getting a selector with an iframe, but if the selector doesn't exist, you will get another error. The next step is getting contentWindow with a native getter. The error probably occurs on this step, but I can't reproduce this case with your iframe example. Could you share a full test example that illustrates this error?

Also, you put the content of the iframe between the tags, but it doesn't work like this. You need to set the path to the document in the src attribute of the iframe.

try:

strace can attach to a process using -p:

Function results are simply not function arguments/parameters. They are passed differently and the exact mechanism depends on the ABI (calling conventions) and their type.

In some ABIs, results are passed on the stack. In other ABIs, they are passed using registers. That concerns simple types that can actually fit into registers. More complex objects may be passed using pointers (on the stack or in registers).

The by value/by reference distinction distinguishes, whether the value of the argument is passed on the stack/in the register directly, or indirectly using a pointer. It does not concern function return values.

There are simpler functions that can be C-interoperable and other Fortran functions that cannot be interoperable, e.g. functions returning arrays. Such Fortran-specific functions are implemented in a compiler-specific way. Often, a hidden argument is being passed. Such a hidden argument may contain a pointer and may be passed using a register or using the stack. The details are again dependent on the specific ABI.

For the calling conventions to the most common x86 architecture, see https://en.wikipedia.org/wiki/X86_calling_conventions There are several different variations for 32 bit and for 64 bit.

Inside your WriteTo function, you should be calling something like w.Write(myBytes).

The size of myBytes inside that function is the size that you are looking for. You can get it using len(myBytes) or with the first return of w.Write(myBytes). This is important because there is no way of "estimating" the size that a file would have, other than directly counting the information that you will write.

You are converting UrlMap into bytes somewhere inside your WriteTo function. That means you can do the same with any URL variable.

The way that I would solve this problem is to have a sizeCounter and add the number of bytes that would be stored everytime I create a new URL variable inside the for { loop. In the same place I would also count the number of URLs created. With both counters then the rest is easy.

I would add the transformation from URL to bytes inside the .Add function and return it so that everything is easier to understand. You are going to have to move some variables into the go routine.

This won't give you exactly what you need, but it should be enough to get you on the right track.

Add the following onTouchEvent handler to your custom view:

You're running into a CORS issue.

^{MDN Docs}
Cross-Origin Resource Sharing (CORS) is an HTTP-header based mechanism that allows a server to indicate any origins (domain, scheme, or port) other than its own from which a browser should permit loading resources.

The file is from another server with CORS enabled, or from file:///, and such is not allowed for security reasons.

Basically,
a remote server should serve files with a header like:

I'm wondering if I can do the same with mock.patch()?

Sure, by using mock.patch.object():

That's just the nature of IntelliSense. Once you start to supply some of the combinations of the required props, the suggested ones will be narrowed to only the ones which are applicable to the current possible combination:

Before adding some props:

After adding some props: