From 7eff3fde5720eb23449e2f8c8ea0b8218efe4dde Mon Sep 17 00:00:00 2001
From: Valentin Popov <valentin@popov.link>
Date: Wed, 4 Sep 2024 21:16:37 +0000
Subject: Initial Astro project

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+---
+title: 'Create ".lib" file from ".dll" (archive)'
+author: "Adrian Henke"
+pubDate: "2023-05-04"
+description: "Learn how to generate a *.lib file from a *.dll with this comprehensive guide. Using the Visual Studio Command Prompt and Microsoft's recommended tools, this article walks you through the steps for a seamless process. Perfect for developers working with 3rd party win dll's."
+---
+
+> This's a copy of a non-my post. The original article [is here](https://adrianhenke.wordpress.com/2008/12/05/create-lib-file-from-dll/) ([archive](https://web.archive.org/web/20161118122539/https://adrianhenke.wordpress.com/2008/12/05/create-lib-file-from-dll/)).
+
+When working with 3rd party win dll's you sometimes miss the according to the `*.lib` file required to compile against it. There is an [Microsoft KB-Q131313](http://support.microsoft.com/?scid=kb%3Ben-us%3B131313&x=1&y=15) ([archive](https://jeffpar.github.io/kbarchive/kb/131/Q131313/)) article showing how to generate a `*.lib` file from a `*.dll` however the required steps are not described detailed enough I think. So here is my quick guide.
+
+Open the "Visual Studio Command Prompt", you find its shortcut in "_Start_" -> "_Programs_" -> "_Microsoft Visual Studio Tools_". Now run the `dumpbin` command to get a list of all exported functions of your dll:
+
+```bash
+dumpbin /exports C:\\yourpath\\yourlib.dll
+```
+
+This will print quite a bit of text to the console. However, we are only interested in the functions:
+
+```
+ordinal hint RVA      name
+
+1    0 00017770 jcopy_block_row
+2    1 00017710 jcopy_sample_rows
+3    2 000176C0 jdiv_round_up
+4    3 000156D0 jinit_1pass_quantizer
+5    4 00016D90 jinit_2pass_quantizer
+6    5 00005750 jinit_c_coef_controller
+...etc
+```
+
+Now copy all those function names (only the names!) and paste them into a new text file. Name the next file `yourlib.def` and put the line "EXPORTS" at its top. My `yourlib.def` file looks like this:
+
+```
+EXPORTS
+jcopy_block_row
+jcopy_sample_rows
+jdiv_round_up
+jinit_1pass_quantizer
+jinit_2pass_quantizer
+jinit_c_coef_controller
+...
+```
+
+Now from that definition file, we can finally create the `*.lib` file. We use the `lib` tool for this, so run this command in your "Visual Studio Command Prompt":
+
+```bash
+lib /def:C:\\mypath\\mylib.def /OUT:C:\\mypath\\mylib.lib
+```
+
+That's it, happy coding 🙂
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