David Heffernan

The things you are discussing now seem unrelated to storing pi in a float. I don't feel as though we understand the problem domain yet.

You can't store pi exactly in a float. What is the motivation for the question?

A dfm file is a source file

Definitely not impossible to find the error. Search for TDBLookupComboBox in all the .dfm and .pas files that are compiled.

This isn't true. Your class function calls the default constructor and that performs memory allocation. Free must be called. Instances of classes are heap allocated.

What have you tried so far?

What specifically do you mean by "help me translate"

6 month contract and you have to jump through all these hoops. It's a seller's market right now.

Staggering that an employer could post something as demeaning as this.

Next release of Python supports per interpreter GIL which sounds exciting.

Well, there will be an error code. You have to retrieve it.

When you tried this, what happened? What error was reported. Or was there no error reported?

This is precisely what I am doing. My Python build code to perform signing starts like this: def Sign(filename, sdk=None): # see https://medium.com/@joshualipson/ev-code-certificates-automated-builds-for-windows-6100fb8e8be6

It doesn't look like that to me. It looks like a file read for a file named by UNC. I don't think I'd be wanting to use FileOpen anywhere ever. Shouldn't you be using streams these days? Having said that of course, FileOpen still works. You didn't tell us what happened when you used the old code. If you have a problem that you want some help with, then you should say what the problem is. People can't offer solutions to problems that aren't described. Do you understand what \\IP_address\FolderName\Filename is? I trust you do, and that the file specified by this UNC path is available on your current target device. Is it?

For the record this is completely wrong

You said a C# project. Anyway, why don't you do this work yourself?

That will maybe buy you 30 minutes of a qualified person's time.

Hire a programmer

That's not quite enough. Do the exe and bpl both link to the same runtime packages?

This will work fine so long as everything is linked correctly. No need even to use stdcall. So probably the linkage is messed up. We can't see the entire picture.

To cast to PByte then it's PByte(myPointer)

No idea what type myPointer is. A simple 10 line program would reveal all.

Code is utter shite anyway. Just cast @InData to PDWORD and use pointer arithmetic already. I would imagine that FixInsight would give the warnings you want.

Every time you cast a pointer to a 32 bit integelral value, you are truncating. This is 64 bit porting 101. longword(@InData) That's truncation.