Accessing COM Objects

[John via Digitalmars-d-learn]

On Wednesday, 15 June 2016 at 18:32:28 UTC, Joerg Joergonson 
wrote:
>>   import core.sys.windows.com, core.sys.windows.oaidl;
>
> Thanks. Should these not be added to the generated file?

The problem is that other type libraries will probably require 
other headers to be imported, and there's no way to work out 
which, so I've left that up to the user for now.

>
> Also, could you add to it the following:
>
> const static GUID iid = 
> Guid!("5DE90358-4D0B-4FA1-BA3E-C91BBA863F32");
>
> inside the interface (Replace the string with the correct guid)?
>
>
>
> This allows it to work with ComPtr which looks for the iid 
> inside the interface, shouldn't hurt anything.

I could add that as an option.

>
> In any case, I haven't got ComPtr to work so...
>
>
> GUID Guid(string str)()
> {
>     static assert(str.length==36, "Guid string must be 36 chars 
> long");
>     enum GUIDstring = "GUID(0x" ~ str[0..8] ~ ", 0x" ~ 
> str[9..13] ~ ", 0x" ~ str[14..18] ~
>         ", [0x" ~ str[19..21] ~ ", 0x" ~ str[21..23] ~ ", 0x" ~ 
> str[24..26] ~ ", 0x" ~ str[26..28]
>         ~ ", 0x" ~ str[28..30] ~ ", 0x" ~ str[30..32] ~ ", 0x" 
> ~ str[32..34] ~ ", 0x" ~ str[34..36] ~ "])";
>     return mixin(GUIDstring);
> }
>
>
> ....
>
> also tried CoCreateInstance and getting error 80040154
>
> Not sure if it works.
>
> ....
>
> Changed the GUID to another one found in the registry(not the 
> one at the top of the generated file) and it works. Both load 
> photoshop

Oops. The one at the top of the file is the type library's ID, 
not the class ID. I should just omit it if it causes confusion.

>
>
> int main(string[] argv)
> {
>
> 	//auto ps = ComPtr!_Application(CLSID_PS).require;
> 		
> 	//const auto CLSID_PS = 
> Guid!("6DECC242-87EF-11cf-86B4-444553540000"); // PS 90.1 fails 
> because of interface issue
> 	const auto CLSID_PS = 
> Guid!("c09f153e-dff7-4eff-a570-af82c1a5a2a8");   // PS 90.0 
> works.
> 	
>
>
> 			
>     auto hr = CoInitialize(null);
>     auto iid = IID__Application;
>
>
>     _Application* pUnk;
>
>     hr = CoCreateInstance(&CLSID_PS, null, CLSCTX_ALL, &iid, 
> cast(void**)&pUnk);
>     if (FAILED(hr))
>             throw new Exception("ASDF");
>
> }
>
> The photoshop.d file
> http://www.filedropper.com/photoshop_1
>
>
> So, I guess it works but how to access the methods? The 
> photoshop file looks to have them listed but they are all 
> commented out.

They're commented out because Photoshop seems to have only 
provided a late-binding interface and you have to call them by 
name through IDispatch.Invoke. It's possible to wrap all that in 
normal D methods, and I'm working on it, but it won't be ready 
for a while.