How can I assign a longword variable to a custom function variable？

[Ronaldo Huang]

I want to call a function which is in a custom DLL. An error occurs when compiling it. Can anyone help to solve it? The details are below.

[Martijn Laan]

Hi,

See the CodeDll.iss example script for the correct method to work with DLL files. The help file also has a dedicated topic. Using GetProcAddress won't work. 

Greetings,

Martijn

-------- Original Message --------

On Friday, 05/08/26 at 06:04 Ronaldo Huang <huang2...@gmail.com> wrote:

I want to call a function which is in a custom DLL. An error occurs when compiling it. Can anyone help to solve it? The details are below.

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[Ronaldo Huang]

Thanks, I’ve got it. I have read the help file, but I didn't find a way to call the DLL where it is in the app path. Is there any way to do that?

[Gavin Lambert]

On Friday, May 8, 2026 at 8:38:06 PM UTC+12 Ronaldo Huang wrote:

Thanks, I’ve got it. I have read the help file, but I didn't find a way to call the DLL where it is in the app path. Is there any way to do that?

Just specify the appropriate path.  The CodeDll.iss script has an example of doing this at uninstall time.  If you want to do this at install time as well then you should use "delayload" and avoid calling it until after the installation has completed (CurStepChanged(ssPostInstall) or later). 

[Ronaldo Huang]

I have tried what you said. It still doesn't work. Anyway, I solved my issue in another way.