crash when loading a .xlsx file on Linux

Jean-Michel Perraud — Tue, 27 May 2025 07:00:32 -0000

I am trying to refactor some pascal code from a windows App to a non-gui library running on Linux. I am invoking exported functions from python, passing in a valid file name to an .xlsx file that opens fine in libreoffice.

The python side invoking the function is:

def load_cam_parameters(filename):
    """Python wrapper for LoadFullCAMParameters"""
    c_filename = ffi.new("char[]", filename.encode('utf-8'))
    lib.LoadFullCAMParameters(c_filename)

internally to pascal code the PChar is converting to a pascal String before being passed further into the call stack.

My API entry point has a handler for trapping exceptions and recovering from it, so this seems not to be an exception.

The crash occurs near or at the 'begin' keyword of TOCustomExporterXLSX.DoImport, and the process terminates near these lines:

begin
  Result := inherited DoImport(aStream);

I've managed to set up a debugger in vscode, and the call stack is:

DoImport (/path/to/src/OExport.pas:16129)
LoadFromStream (/path/to/src/OExport.pas:11482)
LoadFromFile (/path/to/src/OExport.pas:11426)
LoadFromFile (/path/to/src/OExport.pas:11439)
LoadFromFile (/path/to/src/OExport.pas:11450)
LoadFile (/path/to/src/FullCAMDataManager.pas:115)
LoadParams (/path/to/src/ReadFullCAMParameters.pas:483)
LoadFullCAMParameters (/path/to/src/FullCAMDataManager.pas:131)
LoadFullCAMParametersEx (/path/to/src/FullCAMDataManager.pas:151)
LoadFullCAMParametersApi (/path/to/src/plantation.lpr:19)
ffi_call_unix64 (Unknown Source:0)
ffi_call_int (Unknown Source:0)
cdata_call (/project/cffi/src/c/_cffi_backend.c:3229)
_PyEval_EvalFrameDefault (Unknown Source:0)
PyEval_EvalCode (Unknown Source:0)
builtin_exec (Unknown Source:0)
_PyEval_EvalFrameDefault (Unknown Source:0)
gen_send_ex2 (Unknown Source:0)
gen_send_ex (Unknown Source:0)
_PyEval_EvalFrameDefault (Unknown Source:0)
method_vectorcall.llvm (Unknown Source:0)

Any hint as to what is happening?

DTD validation is possible?

Ondrej Pokorny — Fri, 18 Sep 2020 05:53:27 -0000

Hello, no unfortunately I had to postpone the XSD validator - not really a lot of demand.

DTD validation is possible?

Anonymous — Thu, 17 Sep 2020 16:33:13 -0000

Now validating by XSD is available? I looking for XML library with validating.

Compiling XE6 packages under Delphi 10.2 (error in OEncoding.pas)

Anonymous — Fri, 12 Jan 2018 21:43:22 -0000

I am using the sourceforge version. Shall I download the trial from the website ?

Compiling XE6 packages under Delphi 10.2 (error in OEncoding.pas)

Ondrej Pokorny — Fri, 12 Jan 2018 08:57:15 -0000

I assume you have a very old OXml version. AFAIK I solved it long time ago.

Compiling XE6 packages under Delphi 10.2 (error in OEncoding.pas)

Anonymous — Fri, 12 Jan 2018 07:28:42 -0000

It seems like there's a conditional issue with OEncoding.pas which doesn't compile (cannot access private symbol TMBCSEncoding.FCodePage).

Delphi 10.2 Tokyo 32 VER320
Delphi 10.1 Berlin 31 VER310
Delphi 10 Seattle 30 VER300

Anyone was able to complete the rebuild/compile process ?

OXML - Querying Node with 2 attributes using XPath

Anonymous — Tue, 28 Nov 2017 21:35:37 -0000

Looking at the following simple xml structure:

<testnode a1="1" a2="2">Testdata</testnode>
<testnode a1="2" a2="2">Testdata2</testnode>

How to select the node with attributes a1="2" and a2="2"?

//testnode[@a1="1"][@a2="2"]

is not working as well as

//testnode[@a1="1" and @a2="2"]

What is the correct XPath syntax to use?

OXML. Lazarus. Online Package Manager

Anonymous — Sun, 30 Apr 2017 15:45:30 -0000

Hello Ondrej,

Since there is a new tool coming up in Lazarus/fpc I'll invite/ask you to provide your packages using OPM (Online Package Manager). That enables Lazarus Users to install the packages with some clicks instead of the old long lasting routine.

Here ist the forum thread of the user GetMem, the maintainer of OPM:
http://forum.lazarus.freepascal.org/index.php/topic,34297.795.html?PHPSESSID=uk9uc580649s8fur1aadsj4kv6

This Link https://www.youtube.com/watch?v=oxCArRUiKm8&feature=youtu.be describes how to create a private repository which i assume is similar to the public repository.
GetMem will sureley assist in providing your packages using your current infrastructure.

Thanks in advance

Karl

DTD validation is possible?

Ondrej Pokorny — Mon, 27 Mar 2017 09:10:30 -0000

XSD has quite a lot of features so first I'll add features that my customers need. The best will be if you send me your XSD files to check them. You find my email address on my homepage www.kluug.net

DataBinding is due in about 2 weeks, then I'll start with XSD validation. So the first alpha version to test in about 1-2 months.

DTD validation is possible?

Anonymous — Mon, 27 Mar 2017 08:43:17 -0000

Sounds good, thanks.

Will it be possible to check against multiple .xsd files or better to say against one .xsd files, which does import a few other .xsd files?

Any rough ETA?

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crash when loading a .xlsx file on Linux

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