[Glass] Passing a enum element to a C library

[Smalltalk at JGFoster.net]

It seems to me that the function should be interpreted as (#’ptr’ #’int’ #’ptr’) since an enum is simply an integer. Try passing it just 0 and see if that goes through.

James

> On Jul 1, 2020, at 4:41 PM, bruno buzzi brassesco via Glass <glass at lists.gemtalksystems.com> wrote:
> 
> Hi,
> 
> How to pass an enum element to a C library.
> C function signature:
> int ssh_options_set(ssh_session session, enum ssh_options_e type, const void *value)
> 
> The enum is defined as:
> enum ssh_options_e {
>  SSH_OPTIONS_HOST,
>  SSH_OPTIONS_PORT}
> 
> An any C call is like:
> ssh_options_set(my_ssh_session, SSH_OPTIONS_HOST, "localhost");
> 
> GS generated wrapper:
> ssh_options_set_: session _: type _: value
>    "Interpreted as #int32 from #( #'ptr' #'ptr' #'ptr' )"
>    ^Functionssh_options_set callWith: { session. type. value }
> 
> In GS i tried something like:
> myLibrary ssh_options_set_: session _: optionHost _: hostName
> where
> session: is created in another successful call to myLibrary
> 
> optionHost:
> cStructPointer := CByteArray gcMalloc: 8.
> cStructPointer uint64At: 0 put: 0. "0 correspond to SSH_OPTIONS_HOST - maybe i'm wrong"
> 
> hostName: CByteArray withAll: 'localhost'
> 
> But it seems that something is wrong. The chapter 18 do something like this with another library.
> So [optionHost] or [hostName] has a wrong value...
> For now no successful call passing an enum element.
> 
> Now back to fight with C :)
> 
> regards,
> bruno
> 
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