[Glass] Passing a enum element to a C library

[Smalltalk at JGFoster.net]

Bruno,

I’m glad you got it working. And you properly interpreted my first suggestion (which didn’t work). I was going to investigate a bit more before making any further suggestions, but you anticipated where I was going. I’ll look further into the problem but I’m glad you have a work-around.

James

> On Jul 1, 2020, at 6:51 PM, bruno buzzi brassesco <smalltalk at adinet.com.uy> wrote:
> 
> James,
> 
> After replacing #'prt' with #'uint32' and initializing the wrapper the C call work as expected :)
> Excellent !
> regards,
> bruno
> 
> On 1/7/2020 21:27, Smalltalk at JGFoster.net wrote:
>> 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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>>> Glass at lists.gemtalksystems.com
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>