On Monday, 27 June 2016 at 21:17:52 UTC, Thalamus wrote:
Hi everyone,
I've succeeded in using D as a client for regular (registered)
COM servers in the past, but in this case, I'm building the
server as well. I would like to avoid registering it if
possible so XCOPY-like deployment remains an option. Can a
registration-free COM client be built in D? If so, how can the
code be setup to consume the manifest file, or alternately, is
there a way to just point D to the correct assembly directly in
code?
To load load a COM object from a given file (DLL or AX) without
having it registered, just load the file with CoLoadLibrary() and
use its DllGetClassObject() function to get IClassFactory which
will give you any kind of object in this library.
Here's how I do it (in my case the requested object has
"IBaseFilter" COM interface):
IBaseFilter createDSFilterFromFile(GUID guid, string dir, string
fname) {
auto curdir = getcwd();
scope(exit) chdir(curdir);
chdir(dir); // in case the lib depends on other dlls nearby
auto hinst = CoLoadLibrary( cast(wchar*) buildPath(dir,
fname).toUTF16z, TRUE);
enforce!COMException(hinst);
auto fnGetClassObject = cast(LPFNGETCLASSOBJECT)
GetProcAddress(hinst, "DllGetClassObject");
enforce!COMException(fnGetClassObject);
IClassFactory factory;
auto iid = IID_IClassFactory;
fnGetClassObject(&guid, &iid,
cast(void**)&factory).checkHR("fnGetClassObject failed");
enforce!COMException(factory);
IBaseFilter ibf;
factory.CreateInstance(null, &IID_IBaseFilter,
cast(void**)&ibf).checkHR("factory.CreateInstance");
return ibf;
}
