{"id":3070,"date":"2023-04-02T06:28:15","date_gmt":"2023-04-02T00:58:15","guid":{"rendered":"https:\/\/www.rangakrish.com\/?p=3070"},"modified":"2023-04-02T06:28:15","modified_gmt":"2023-04-02T00:58:15","slug":"building-v-language-dll","status":"publish","type":"post","link":"https:\/\/www.rangakrish.com\/index.php\/2023\/04\/02\/building-v-language-dll\/","title":{"rendered":"Building V Language DLL"},"content":{"rendered":"

The relatively new V Programming Language (Vlang)<\/strong><\/em><\/a> boasts of some interesting features such as \u201cfast compilation\u201d<\/strong><\/em> and runtime performance \u201cas fast as C\u201d<\/strong><\/em>, at the same time being a \u201csimple language\u201d<\/strong><\/em>.<\/p>\n

As I normally do with other languages that I learn and use, I decided to see how easy it is to build a shared library, a Windows DLL<\/strong><\/em> in this case. Today\u2019s article explains this aspect of the language.<\/p>\n

I am using V 0.3.3<\/strong><\/em> on my Windows 10 (64 bit)<\/strong><\/em> machine.<\/p>\n

First, let us define a couple of functions. Here is the code I wrote:<\/p>\n

\"V<\/a>
V Program<\/strong><\/figcaption><\/figure>\n

The function \u201cfibonacci\u201d<\/strong><\/em> computes the \u201cnth\u201d Fibonacci<\/strong><\/em> number and the function \u201clucas\u201d<\/strong><\/em> computes the \u201cnth\u201d Lucas<\/strong><\/em> number. Because both functions are identical except for the starting values, I wrote a helper function to share the logic.<\/p>\n

The functions that need to be exported from the DLL<\/strong><\/em> must use the \u201cexport\u201d<\/strong><\/em> attribute and must be defined as \u201cpub\u201d<\/strong><\/em>. Accordingly, the functions \u201cfibonacci\u201d<\/strong><\/em> and \u201clucas\u201d<\/strong><\/em> are both public and have the \u201cexport\u201d<\/strong><\/em> attribute, whereas the helper function is private and is not exported.<\/p>\n

Compiling the source to generate the DLL<\/strong><\/em> is quite simple. Just run \u201cv -shared -prod dllfns.v\u201d<\/strong><\/em><\/span> from the command prompt (Note: This requires \u201cgcc\u201d<\/strong><\/em> or \u201cMSVC\u201d<\/strong><\/em> to be present in the PATH<\/strong><\/em>). This will create the DLL<\/strong> \u201cdllfns.dll\u201d<\/strong><\/em> along with a few other files. To use the generated DLL<\/strong><\/em> in another program, we do not require any other dependent file. This makes deploying the DLL<\/strong><\/em> easy.<\/p>\n

To consume the Vlang DLL<\/strong><\/em>, I first wrote a C++<\/strong><\/em> program:<\/p>\n

\"C++<\/a>
C++ Program to Consume the DLL<\/strong><\/figcaption><\/figure>\n

I copied the DLL<\/strong><\/em> to the C++<\/strong><\/em> executable directory and then ran the program:<\/p>\n

\"Program<\/a>
Program Output<\/strong><\/figcaption><\/figure>\n

Works as expected!<\/p>\n

As another test, I wrote a Lisp<\/strong><\/em> program (LispWorks<\/a> 64 bit Windows<\/strong><\/em>) to call the two functions defined in the DLL<\/strong><\/em>:<\/p>\n

\"Lisp<\/a>
Lisp Program<\/strong><\/figcaption><\/figure>\n

That also works perfectly!<\/p>\n

\"Lisp<\/a>
Lisp Result<\/strong><\/figcaption><\/figure>\n

My first experience with Vlang<\/strong><\/em> is quite positive and I am quite eager to explore the other features of the language in due course.<\/p>\n

Here<\/strong><\/em><\/a> are the source files I used.<\/p>\n

Have a great weekend!<\/p>\n","protected":false},"excerpt":{"rendered":"

The relatively new V Programming Language (Vlang) boasts of some interesting features such as \u201cfast compilation\u201d and runtime performance \u201cas fast as C\u201d, at the same time being a \u201csimple language\u201d. As I normally do with other languages that I learn and use, I decided to see how easy it is to build a shared […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_seo_schema_type":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[17,355],"tags":[149,357,356],"class_list":["post-3070","post","type-post","status-publish","format-standard","hentry","category-programming","category-vlang","tag-dll","tag-v-programming","tag-vlang"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p9OLnF-Nw","jetpack-related-posts":[{"id":2645,"url":"https:\/\/www.rangakrish.com\/index.php\/2021\/12\/25\/calling-lisp-functions-from-d-language\/","url_meta":{"origin":3070,"position":0},"title":"Calling Lisp Functions from D Language","author":"admin","date":"December 25, 2021","format":false,"excerpt":"After exploring \"newLisp\" in the past few posts, I would like to start looking at the \"D Programming Language\"\u00a0(DLang). DLang\u00a0has been around since 2001. It was originally created by Walter Bright and later Andrei Alexandrescu joined the team in 2007. The main inspiration for DLang was C++, although it uses\u2026","rel":"","context":"In "D Language"","block_context":{"text":"D Language","link":"https:\/\/www.rangakrish.com\/index.php\/category\/d-language\/"},"img":{"alt_text":"Lisp Function Called from D","src":"https:\/\/i0.wp.com\/www.rangakrish.com\/wp-content\/uploads\/2021\/12\/Lisp-300x107.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.rangakrish.com\/wp-content\/uploads\/2021\/12\/Lisp-300x107.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.rangakrish.com\/wp-content\/uploads\/2021\/12\/Lisp-300x107.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":2496,"url":"https:\/\/www.rangakrish.com\/index.php\/2021\/08\/07\/first-encounter-with-the-ring-programming-language\/","url_meta":{"origin":3070,"position":1},"title":"First Encounter with the Ring Programming Language","author":"admin","date":"August 7, 2021","format":false,"excerpt":"The Ring Programming Language, designed by Mahmoud Fayed,\u00a0 has been around since 2016. I came to know of it quite accidentally two weeks ago when I received a promotional email from Apress about their book \"Beginning Ring Programming\" by Mansour Ayouni, published in 2020. I immediately did a google search\u2026","rel":"","context":"In "C++"","block_context":{"text":"C++","link":"https:\/\/www.rangakrish.com\/index.php\/category\/c\/"},"img":{"alt_text":"Ring Installation Directory","src":"https:\/\/i0.wp.com\/www.rangakrish.com\/wp-content\/uploads\/2021\/08\/directory-300x155.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":944,"url":"https:\/\/www.rangakrish.com\/index.php\/2018\/06\/10\/calling-lisp-functions-from-go-language\/","url_meta":{"origin":3070,"position":2},"title":"Calling Lisp Functions from Go Language","author":"admin","date":"June 10, 2018","format":false,"excerpt":"In the previous post, we saw how to invoke a Go function from Lisp. 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