You can use the syntax --preload-file srcpath@dstpath to choose which
directory to place the source content into. See e.g. comments in this
issue: https://github.com/kripken/emscripten/issues/486 . Also, you can
open up the created file_data.js file to examine the path names of the
files that were generated there. Does that help?


2014-02-13 4:04 GMT+02:00 Mark Callow <[email protected]>:

>  I am trying to use --preload-file. The build concludes successfully but
> the app is failing to load the files. There are no messages in the browser
> or web consoles, except "preload time: XXXms" which seems to indicate
> successful preloading.
>
> I attempted to debug the js but found major flaws in all the available
> debuggers which I'll list below. I did manage to observe the parameter
> being passed to fopen. It was a decimal number. How can I find out if that
> corresponds to the intended filename string?
>
> Another issue is lack of documentation about how --preload-file handles
> paths. I eventually looked at tests/hello_world_files.cpp which shows
> passing a relative path to --preload-file and passing the same relative
> path to fopen. That is what I am doing.
>
> I tried to view FS.readFiles but the debugger said it is undefined.
>
> Debugger issues:
>
>    - Firefox/built-in debugger showed original C source code and let me
>    set breakpoints but
>       - it didn't always stop at the breakpoints.
>       - when it did and I stepped through the code it jumped wildly
>       around the code.
>       - when I finally got it to stop at the first line of a function, it
>       told me the function's parameter was "undefined" which is unlikely given
>       that the code at the call site sets it to a hardcoded number.
>    - Firefox/Firebug's code search and source browser is completely
>    useless so I was unable to find the places I want to set breakpoints. I
>    think the problem is related to the length of the source file. After I
>    enter the text for which I want to search, the source browser pane goes
>    blank. If I click an up or down arrow source code appears but it does not
>    contain the text I was looking for. It may be that the desired text is
>    nearby but scrolling is unusable. Each arrow click moves the code too far,
>    so I can't conform that.
>     - Chrome. When I set a breakpoint in the Javascript code, the
>    breakpoints menu shows what appears to be the correct C source code line
>    but completely different Javascript from the line where I set the
>    breakpoint. After turning off JS maps, I got the breakpoint in the right
>    place which is at the caller of the function for loading a file. However
>    when I attempt to step into the function Chrome acts as if I had clicked
>    the continue button.
>
> How are you supposed to debug this stuff? Skid marks?
>
> Regards
>
>     -Mark
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