Javascript / C variable passing

[M_Smoot]

On a client's web page, I wish to call a C language function (in a Windows DLL) to retrieve an array of structures. Each structure consists of a few numbers and a few strings. The array holds about a dozen such structures.

I'd like to pass Javascript variable(s) in the C function call and have the C function populate the array of structures. The best way to do that is not clear to me, so I'm asking for suggestions and maybe a sample code snippet.

Thanks in advance for all suggestions and comments.