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com.d
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/++
Code for COM interop on Windows. You can use it to consume
COM objects (including several objects from .net assemblies)
and to create COM servers with a natural D interface.
This code is not well tested, don't rely on it yet. But even
in its incomplete state it might help in some cases. Strings
and integers work pretty ok.
You can use it to interoperate with Word and Excel:
---
void wordmain() {
// gets the name of the open Word instance, if there is one
// getComObject gets the currently registered open one, and the
// "false" here means do not create a new one if none exists
// (try changing it to true to open a hidden Word)
auto wrd = getComObject("Word.Application", false);
writeln(wrd.ActiveDocument.Name.getD!string);
}
void excelmain() {
// create anew Excel instance and put some stuff in it
auto xlApp = createComObject("Excel.Application");
try {
xlApp.Visible() = 1;
xlApp.Workbooks.Add()();
xlApp.ActiveSheet.Cells()(1, 1).Value() = "D can do it";
xlApp.ActiveWorkbook.ActiveSheet.Cells()(1,2).Value() = "but come on";
writeln("success");
readln();
xlApp.ActiveWorkbook.Close()(0);
} catch(Exception e) {
writeln(e.toString);
writeln("waiting"); // let the user see before it closes
readln();
}
xlApp.Quit()();
}
---
The extra parenthesis there are to work around D's broken `@property` attribute, you need one at the end before a = or call operator.
Or you can work with your own custom code:
```c#
namespace Cool {
public class Test {
static void Main() {
System.Console.WriteLine("hello!");
}
public int test() { return 4; }
public int test2(int a) { return 10 + a; }
public string hi(string s) { return "hello, " + s; }
}
}
```
Compile it into a library like normal, then `regasm` it to register the
assembly... then the following D code will work:
---
import arsd.com;
interface CsharpTest {
int test();
int test2(int a);
string hi(string s);
}
void main() {
auto obj = createComObject!CsharpTest("Cool.Test"); // early-bind dynamic version
//auto obj = createComObject("Cool.Test"); // late-bind dynamic version
import std.stdio;
writeln(obj.test()); // early-bind already knows the signature
writeln(obj.test2(12));
writeln(obj.hi("D"));
//writeln(obj.test!int()); // late-bind needs help
//writeln(obj.opDispatch!("test", int)());
}
---
I'll show a COM server example later. It is cool to call D objects
from JScript and such.
+/
module arsd.com;
import arsd.core;
// for arrays to/from IDispatch use SAFEARRAY
// see https://stackoverflow.com/questions/295067/passing-an-array-using-com
// for exceptions
// see: https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-erref/705fb797-2175-4a90-b5a3-3918024b10b8
// see: https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-erref/0c0bcf55-277e-4120-b5dc-f6115fc8dc38
/+
see: program\cs\comtest.d on the laptop.
as administrator: from program\cs
c:\Windows\Microsoft.NEt\Framework64\v4.0.30319\regasm.exe /regfile /codebase test.dll
note: use the 64 bit register for 64 bit programs (Framework64)
use 32 for 32 bit program (\Framework\)
sn -k key.snk
program\cs\makefile
test.js in there shows it form wsh too
i can make it work through IDispatch easily enough, though
ideally you'd have a real interface, that requires cooperation
that the idispatch doesn't thanks to .net doing it for us.
passing other objects should work too btw thanks to idispatch
in the variants... not sure about arrays tho
and then fully dynamic can be done with opDispatch for teh lulz.
+/
/+
createComObject returns the wrapped one
wrapping can go dynamic if it is wrapping IDispatch
some other IUnknown gets minimal wrapping (Translate formats)
all wrappers can return lower level stuff on demand. like LL!string maybe is actually an RAII BSTR.
i also want variant to jsvar and stuff like that.
createRawComObject returns the IUnknown raw one
+/
public import core.sys.windows.windows;
public import core.sys.windows.com;
public import core.sys.windows.wtypes;
public import core.sys.windows.oaidl;
import core.stdc.string;
import core.atomic;
pragma(lib, "advapi32");
pragma(lib, "uuid");
pragma(lib, "ole32");
pragma(lib, "oleaut32");
pragma(lib, "user32");
/* Attributes that help with automation */
///
static immutable struct ComGuid {
///
this(GUID g) { this.guid = g; }
///
this(string g) { guid = stringToGuid(g); }
GUID guid;
}
GUID stringToGuid(string g) {
return GUID.init; // FIXME
}
bool hasGuidAttribute(T)() {
bool has = false;
foreach(attr; __traits(getAttributes, T))
static if(is(typeof(attr) == ComGuid))
has = true;
return has;
}
template getGuidAttribute(T) {
static ComGuid helper() {
foreach(attr; __traits(getAttributes, T))
static if(is(typeof(attr) == ComGuid))
return attr;
assert(0);
}
__gshared static immutable getGuidAttribute = helper();
}
/* COM CLIENT CODE */
__gshared int coInitializeCalled;
shared static ~this() {
CoFreeUnusedLibraries();
if(coInitializeCalled) {
CoUninitialize();
coInitializeCalled--;
}
}
///
void initializeClassicCom() {
if(coInitializeCalled)
return;
ComCheck(CoInitialize(null), "COM initialization failed");
coInitializeCalled++;
}
///
bool ComCheck(HRESULT hr, string desc) {
if(FAILED(hr))
throw new ComException(hr, desc);
return true;
}
///
class ComException : WindowsApiException {
this(HRESULT hr, string desc, string file = __FILE__, size_t line = __LINE__) {
this.hr = hr;
super(desc, cast(DWORD) hr, null, file, line);
}
HRESULT hr;
}
template Dify(T) {
static if(is(T : IUnknown)) {
// FIXME
static assert(0);
} else {
alias Dify = T;
}
}
struct ComResult {
VARIANT result;
ComProperty opDispatch(string memberName)() {
auto newComObject = (result.vt == 9) ? result.pdispVal : null;
DISPID dispid;
if(newComObject !is null) {
import std.conv;
wchar*[1] names = [(to!wstring(memberName) ~ "\0"w).dup.ptr];
ComCheck(newComObject.GetIDsOfNames(&GUID_NULL, names.ptr, 1, LOCALE_SYSTEM_DEFAULT, &dispid), "Look up name " ~ memberName);
} else throw new Exception("cannot get member of non-object");
return ComProperty(newComObject, dispid, memberName);
}
T getD(T)() {
switch(result.vt) {
case 3: // int
static if(is(T : const long))
return result.intVal;
throw new Exception("cannot convert variant of type int to requested " ~ T.stringof);
case 8: // string
static if(is(T : const string))
return makeUtf8StringFromWindowsString(result.bstrVal); // FIXME free?
throw new Exception("cannot convert variant of type string to requested " ~ T.stringof);
default:
return getFromVariant!T(result);
//throw new Exception("can't handle this type " ~ to!string(result.vt));
}
}
}
struct ComProperty {
IDispatch innerComObject_;
DISPID dispid;
this(IDispatch a, DISPID c, string name) {
this.innerComObject_ = a;
this.dispid = c;
}
T getD(T)() {
auto res = _fetchProperty();
return res.getD!T;
}
ComResult _fetchProperty() {
DISPPARAMS disp_params;
VARIANT result;
EXCEPINFO einfo;
uint argError;
auto hr =innerComObject_.Invoke(
dispid,
&GUID_NULL, LOCALE_SYSTEM_DEFAULT, // whatever
DISPATCH_PROPERTYGET,
&disp_params,
&result,
&einfo, // exception info
&argError // arg error
);//, "Invoke");
import std.conv;
if(FAILED(hr)) {
if(hr == DISP_E_EXCEPTION) {
auto code = einfo.scode ? einfo.scode : einfo.wCode;
string source;
string description;
if(einfo.bstrSource) {
// this is really a wchar[] but it needs to be freed so....
source = einfo.bstrSource[0 .. SysStringLen(einfo.bstrSource)].to!string;
SysFreeString(einfo.bstrSource);
}
if(einfo.bstrDescription) {
description = einfo.bstrDescription[0 .. SysStringLen(einfo.bstrDescription)].to!string;
SysFreeString(einfo.bstrDescription);
}
if(einfo.bstrHelpFile) {
// FIXME: we could prolly use this too
SysFreeString(einfo.bstrHelpFile);
// and dwHelpContext
}
throw new ComException(code, description ~ " (from com source " ~ source ~ ")");
} else {
throw new ComException(hr, "Property get failed " ~ to!string(argError));
}
}
return ComResult(result);
}
ComProperty opDispatch(string memberName)() {
return _fetchProperty().opDispatch!memberName;
}
T opAssign(T)(T rhs) {
DISPPARAMS disp_params;
VARIANT[1] vargs;
vargs[0] = toComVariant(rhs);
disp_params.rgvarg = vargs.ptr;
disp_params.cNamedArgs = 1;
disp_params.cArgs = 1;
DISPID dispidNamed = DISPID_PROPERTYPUT;
disp_params.rgdispidNamedArgs = &dispidNamed;
VARIANT result;
EXCEPINFO einfo;
uint argError;
auto hr =innerComObject_.Invoke(
dispid,
&GUID_NULL, LOCALE_SYSTEM_DEFAULT, // whatever
DISPATCH_PROPERTYPUT,
&disp_params,
&result,
&einfo, // exception info
&argError // arg error
);//, "Invoke");
import std.conv;
if(FAILED(hr)) {
if(hr == DISP_E_EXCEPTION) {
auto code = einfo.scode ? einfo.scode : einfo.wCode;
string source;
string description;
if(einfo.bstrSource) {
// this is really a wchar[] but it needs to be freed so....
source = einfo.bstrSource[0 .. SysStringLen(einfo.bstrSource)].to!string;
SysFreeString(einfo.bstrSource);
}
if(einfo.bstrDescription) {
description = einfo.bstrDescription[0 .. SysStringLen(einfo.bstrDescription)].to!string;
SysFreeString(einfo.bstrDescription);
}
if(einfo.bstrHelpFile) {
// FIXME: we could prolly use this too
SysFreeString(einfo.bstrHelpFile);
// and dwHelpContext
}
throw new ComException(code, description ~ " (from com source " ~ source ~ ")");
} else {
throw new ComException(hr, "Property put failed " ~ to!string(argError));
}
}
return rhs;
}
ComResult opCall(Args...)(Args args) {
DISPPARAMS disp_params;
static if(args.length) {
VARIANT[args.length] vargs;
foreach(idx, arg; args) {
// lol it is put in backwards way to explain MSFT
vargs[$ - 1 - idx] = toComVariant(arg);
}
disp_params.rgvarg = vargs.ptr;
disp_params.cArgs = cast(int) args.length;
}
VARIANT result;
EXCEPINFO einfo;
uint argError;
//ComCheck(innerComObject_.Invoke(
auto hr =innerComObject_.Invoke(
dispid,
&GUID_NULL, LOCALE_SYSTEM_DEFAULT, // whatever
DISPATCH_METHOD,// PROPERTYPUT, //DISPATCH_METHOD,
&disp_params,
&result,
&einfo, // exception info
&argError // arg error
);//, "Invoke");
if(hr == 0x80020003) { // method not found
// FIXME idk how to tell the difference between a method and a property from the outside..
hr =innerComObject_.Invoke(
dispid,
&GUID_NULL, LOCALE_SYSTEM_DEFAULT, // whatever
DISPATCH_PROPERTYGET,// PROPERTYPUT, //DISPATCH_METHOD,
&disp_params,
&result,
&einfo, // exception info
&argError // arg error
);//, "Invoke");
}
import std.conv;
if(FAILED(hr)) {
if(hr == DISP_E_EXCEPTION) {
auto code = einfo.scode ? einfo.scode : einfo.wCode;
string source;
string description;
if(einfo.bstrSource) {
// this is really a wchar[] but it needs to be freed so....
source = einfo.bstrSource[0 .. SysStringLen(einfo.bstrSource)].to!string;
SysFreeString(einfo.bstrSource);
}
if(einfo.bstrDescription) {
description = einfo.bstrDescription[0 .. SysStringLen(einfo.bstrDescription)].to!string;
SysFreeString(einfo.bstrDescription);
}
if(einfo.bstrHelpFile) {
// FIXME: we could prolly use this too
SysFreeString(einfo.bstrHelpFile);
// and dwHelpContext
}
throw new ComException(code, description ~ " (from com source " ~ source ~ ")");
} else {
import std.conv;
throw new ComException(hr, "Call failed " ~ to!string(cast(void*) innerComObject_) ~ " " ~ to!string(dispid) ~ " " ~ to!string(argError));
}
}
return ComResult(result);
}
}
///
struct ComClient(DVersion, ComVersion = IDispatch) {
ComVersion innerComObject_;
this(ComVersion t) {
this.innerComObject_ = t;
}
this(this) {
if(innerComObject_)
innerComObject_.AddRef();
}
~this() {
if(innerComObject_)
innerComObject_.Release();
}
// note that COM doesn't really support overloading so this
// don't even attempt it. C# will export as name_N where N
// is the index of the overload (except for 1) but...
static if(is(DVersion == Dynamic))
ComProperty opDispatch(string memberName)() {
// FIXME: this can be cached and reused, even done ahead of time
DISPID dispid;
import std.conv;
wchar*[1] names = [(to!wstring(memberName) ~ "\0"w).dup.ptr];
ComCheck(innerComObject_.GetIDsOfNames(&GUID_NULL, names.ptr, 1, LOCALE_SYSTEM_DEFAULT, &dispid), "Look up name");
return ComProperty(this.innerComObject_, dispid, memberName);
}
/+
static if(is(DVersion == Dynamic))
template opDispatch(string name) {
template opDispatch(Ret = void) {
Ret opDispatch(Args...)(Args args) {
return dispatchMethodImpl!(name, Ret)(args);
}
}
}
+/
static if(is(ComVersion == IDispatch))
template dispatchMethodImpl(string memberName, Ret = void) {
Ret dispatchMethodImpl(Args...)(Args args) {
static if(is(ComVersion == IDispatch)) {
// FIXME: this can be cached and reused, even done ahead of time
DISPID dispid;
import std.conv;
wchar*[1] names = [(to!wstring(memberName) ~ "\0"w).dup.ptr];
ComCheck(innerComObject_.GetIDsOfNames(&GUID_NULL, names.ptr, 1, LOCALE_SYSTEM_DEFAULT, &dispid), "Look up name");
DISPPARAMS disp_params;
static if(args.length) {
VARIANT[args.length] vargs;
foreach(idx, arg; args) {
// lol it is put in backwards way to explain MSFT
vargs[$ - 1 - idx] = toComVariant(arg);
}
disp_params.rgvarg = vargs.ptr;
disp_params.cArgs = cast(int) args.length;
}
VARIANT result;
EXCEPINFO einfo;
uint argError;
//ComCheck(innerComObject_.Invoke(
auto hr =innerComObject_.Invoke(
dispid,
&GUID_NULL, LOCALE_SYSTEM_DEFAULT, // whatever
DISPATCH_METHOD,// PROPERTYPUT, //DISPATCH_METHOD,
&disp_params,
&result,
&einfo, // exception info
&argError // arg error
);//, "Invoke");
import std.conv;
if(FAILED(hr)) {
if(hr == DISP_E_EXCEPTION) {
auto code = einfo.scode ? einfo.scode : einfo.wCode;
string source;
string description;
if(einfo.bstrSource) {
// this is really a wchar[] but it needs to be freed so....
source = einfo.bstrSource[0 .. SysStringLen(einfo.bstrSource)].to!string;
SysFreeString(einfo.bstrSource);
}
if(einfo.bstrDescription) {
description = einfo.bstrDescription[0 .. SysStringLen(einfo.bstrDescription)].to!string;
SysFreeString(einfo.bstrDescription);
}
if(einfo.bstrHelpFile) {
// FIXME: we could prolly use this too
SysFreeString(einfo.bstrHelpFile);
// and dwHelpContext
}
throw new ComException(code, description ~ " (from com source " ~ source ~ ")");
} else {
throw new ComException(hr, "Call failed " ~ memberName ~ " " ~ to!string(argError));
}
}
return getFromVariant!(typeof(return))(result);
} else {
static assert(0); // FIXME
}
}
}
// so note that if I were to just make this a class, it'd inherit
// attributes from the D interface... but I want the RAII struct...
// could do a class with a wrapper and alias this though. but meh.
import std.traits;
static foreach(memberName; __traits(allMembers, DVersion)) {
static foreach(idx, overload; __traits(getOverloads, DVersion, memberName)) {
mixin(q{ReturnType!overload }~memberName~q{(Parameters!overload args) {
return dispatchMethodImpl!(memberName, typeof(return))(args);
}
});
}
}
}
VARIANT toComVariant(T)(T arg) {
VARIANT ret;
static if(is(T : VARIANT)) {
ret = arg;
} else static if(is(T : ComClient!(Dynamic, IDispatch))) {
ret.vt = 9;
ret.pdispVal = arg.innerComObject_;
} else static if(is(T : ComProperty)) {
ret = arg._fetchProperty();
} else static if(is(T : int)) {
ret.vt = 3;
ret.intVal = arg;
} else static if(is(T : long)) {
ret.vt = 20;
ret.hVal = arg;
} else static if(is(T : double)) {
ret.vt = 5;
ret.dblVal = arg;
} else static if(is(T : const(char)[])) {
ret.vt = 8;
import std.utf;
ret.bstrVal = SysAllocString(toUTFz!(wchar*)(arg));
} else static assert(0, "Unsupported type (yet) " ~ T.stringof);
return ret;
}
/*
If you want to do self-registration:
if(dll_regserver("filename.dll", 1) == 0) {
scope(exit)
dll_regserver("filename.dll", 0);
// use it
}
*/
// note that HKEY_CLASSES_ROOT\pretty name\CLSID has the guid
// note: https://en.wikipedia.org/wiki/Component_Object_Model#Registration-free_COM
GUID guidForClassName(wstring c) {
GUID id;
ComCheck(CLSIDFromProgID((c ~ "\0").ptr, &id), "Name lookup failed");
return id;
}
interface Dynamic {}
/++
Create a COM object. The passed interface should be a child of IUnknown and from core.sys.windows or have a ComGuid UDA, or be something else entirely and you get dynamic binding.
The string version can take a GUID in the form of {xxxxx-xx-xxxx-xxxxxxxx} or a name it looks up in the registry.
The overload takes a GUID object (e.g. CLSID_XXXX from the Windows headers or one you write in yourself).
It will return a wrapper to the COM object that conforms to a D translation of the COM interface with automatic refcounting.
+/
// FIXME: or you can request a fully dynamic version via opDispatch. That will have to be a thing
auto createComObject(T = Dynamic)(wstring c) {
return createComObject!(T)(guidForClassName(c));
}
/// ditto
auto createComObject(T = Dynamic)(GUID classId) {
initializeClassicCom();
static if(is(T : IUnknown) && hasGuidAttribute!T) {
enum useIDispatch = false;
auto iid = getGuidAttribute!(T).guid;
// FIXME the below condition is just woof
} else static if(is(T : IUnknown) && is(typeof(mixin("core.sys.windows.IID_" ~ T.stringof)))) {
enum useIDispatch = false;
auto iid = mixin("core.sys.windows.IID_" ~ T.stringof);
} else {
enum useIDispatch = true;
auto iid = IID_IDispatch;
}
static if(useIDispatch) {
IDispatch obj;
} else {
static assert(is(T : IUnknown));
T obj;
}
ComCheck(CoCreateInstance(&classId, null, CLSCTX_INPROC_SERVER/*|CLSCTX_INPROC_HANDLER*/|CLSCTX_LOCAL_SERVER, &iid, cast(void**) &obj), "Failed to create object");
// FIXME: if this fails we might retry with inproc_handler.
return ComClient!(Dify!T, typeof(obj))(obj);
}
/// ditto
auto getComObject(T = Dynamic)(wstring c, bool tryCreateIfGetFails = true) {
initializeClassicCom();
auto guid = guidForClassName(c);
auto get() {
auto iid = IID_IDispatch;
IUnknown obj;
ComCheck(GetActiveObject(&guid, null, &obj), "Get Object"); // code 0x800401e3 is operation unavailable if it isn't there i think
if(obj is null)
throw new Exception("null");
IDispatch disp;
ComCheck(obj.QueryInterface(&iid, cast(void**) &disp), "QueryInterface");
auto client = ComClient!(Dify!T, typeof(disp))(disp);
disp.AddRef();
return client;
}
if(tryCreateIfGetFails)
try
return get();
catch(Exception e)
return createComObject(guid);
else
return get();
}
// FIXME: add one to get by ProgID rather than always guid
// FIXME: add a dynamic com object that uses IDispatch
/* COM SERVER CODE */
T getFromVariant(T)(VARIANT arg) {
import std.traits;
import std.conv;
static if(is(T == void)) {
return;
} else static if(is(T == int)) {
if(arg.vt == 3)
return arg.intVal;
} else static if(is(T == bool)) {
if(arg.vt == 11)
return arg.boolVal ? true : false;
} else static if(is(T == string)) {
if(arg.vt == 8) {
auto str = arg.bstrVal;
scope(exit) SysFreeString(str);
return to!string(str[0 .. SysStringLen(str)]);
}
} else static if(is(T == IDispatch)) {
if(arg.vt == 9)
return arg.pdispVal;
} else static if(is(T : IUnknown)) {
// if(arg.vt == 13)
static assert(0);
} else static if(is(T == ComClient!(D, I), D, I)) {
if(arg.vt == 9)
return ComClient!(D, I)(arg.pdispVal);
} else static if(is(T == E[], E)) {
if(arg.vt & 0x2000) {
auto elevt = arg.vt & ~0x2000;
auto a = arg.parray;
scope(exit) SafeArrayDestroy(a);
auto bounds = a.rgsabound.ptr[0 .. a.cDims];
auto hr = SafeArrayLock(a);
if(SUCCEEDED(hr)) {
scope(exit) SafeArrayUnlock(a);
// BTW this is where things get interesting with the
// mid-level wrapper. it can avoid these copies
// maybe i should check bounds.lLbound too.....
static if(is(E == int)) {
if(elevt == 3) {
assert(a.cbElements == E.sizeof);
return (cast(E*)a.pvData)[0 .. bounds[0].cElements].dup;
}
} else static if(is(E == string)) {
if(elevt == 8) {
//assert(a.cbElements == E.sizeof);
//return (cast(E*)a.pvData)[0 .. bounds[0].cElements].dup;
string[] ret;
foreach(item; (cast(BSTR*) a.pvData)[0 .. bounds[0].cElements]) {
auto str = item;
scope(exit) SysFreeString(str);
ret ~= to!string(str[0 .. SysStringLen(str)]);
}
return ret;
}
}
}
}
}
throw new Exception("Type mismatch, needed "~ T.stringof ~"got " ~ to!string(arg.vt));
assert(0);
}
/// Mixin to a low-level COM implementation class
mixin template IDispatchImpl() {
override HRESULT GetIDsOfNames( REFIID riid, OLECHAR ** rgszNames, UINT cNames, LCID lcid, DISPID * rgDispId) {
if(cNames == 0)
return DISP_E_UNKNOWNNAME;
char[256] buffer;
auto want = oleCharsToString(buffer, rgszNames[0]);
foreach(idx, member; __traits(allMembers, typeof(this))) {
if(member == want) {
rgDispId[0] = idx + 1;
return S_OK;
}
}
return DISP_E_UNKNOWNNAME;
}
override HRESULT GetTypeInfoCount(UINT* i) { *i = 0; return S_OK; }
override HRESULT GetTypeInfo(UINT i, LCID l, LPTYPEINFO* p) { *p = null; return S_OK; }
override HRESULT Invoke(DISPID dispIdMember, REFIID reserved, LCID locale, WORD wFlags, DISPPARAMS* params, VARIANT* result, EXCEPINFO* except, UINT* argErr) {
// wFlags == 1 function call
// wFlags == 2 property getter
// wFlags == 4 property setter
foreach(idx, member; __traits(allMembers, typeof(this))) {
if(idx + 1 == dispIdMember) {
static if(is(typeof(__traits(getMember, this, member)) == function))
try {
import std.traits;
ParameterTypeTuple!(__traits(getMember, this, member)) args;
alias argsStc = ParameterStorageClassTuple!(__traits(getMember, this, member));
static if(argsStc.length >= 1 && argsStc[0] == ParameterStorageClass.out_) {
// the return value is often the first out param
typeof(args[0]) returnedValue;
if(params !is null) {
assert(params.cNamedArgs == 0); // FIXME
if(params.cArgs < args.length - 1)
return DISP_E_BADPARAMCOUNT;
foreach(aidx, arg; args[1 .. $])
args[1 + aidx] = getFromVariant!(typeof(arg))(params.rgvarg[aidx]);
}
static if(is(ReturnType!(__traits(getMember, this, member)) == void)) {
__traits(getMember, this, member)(returnedValue, args[1 .. $]);
} else {
auto returned = __traits(getMember, this, member)(returnedValue, args[1 .. $]);
// FIXME: it probably returns HRESULT so we should forward that or something.
}
if(result !is null) {
static if(argsStc.length >= 1 && argsStc[0] == ParameterStorageClass.out_) {
result.vt = 3; // int
result.intVal = returnedValue;
}
}
} else {
if(params !is null) {
assert(params.cNamedArgs == 0); // FIXME
if(params.cArgs < args.length)
return DISP_E_BADPARAMCOUNT;
foreach(aidx, arg; args)
args[aidx] = getFromVariant!(typeof(arg))(params.rgvarg[aidx]);
}
// no return value of note (just HRESULT at most)
static if(is(ReturnType!(__traits(getMember, this, member)) == void)) {
__traits(getMember, this, member)(args);
} else {
auto returned = __traits(getMember, this, member)(args);
// FIXME: it probably returns HRESULT so we should forward that or something.
}
}
return S_OK;
} catch(Throwable e) {
// FIXME: fill in the exception info
if(except !is null) {
except.sCode = 1;
import std.utf;
except.bstrDescription = SysAllocString(toUTFz!(wchar*)(e.toString()));
except.bstrSource = SysAllocString("amazing"w.ptr);
}
return DISP_E_EXCEPTION;
}
}
}
return DISP_E_MEMBERNOTFOUND;
}
}
/// Mixin to a low-level COM implementation class
mixin template ComObjectImpl() {
protected:
IUnknown m_pUnkOuter; // Controlling unknown
PFNDESTROYED m_pfnDestroy; // To call on closure
/*
* pUnkOuter LPUNKNOWN of a controlling unknown.
* pfnDestroy PFNDESTROYED to call when an object
* is destroyed.
*/
public this(IUnknown pUnkOuter, PFNDESTROYED pfnDestroy) {
m_pUnkOuter = pUnkOuter;
m_pfnDestroy = pfnDestroy;
}
~this() {
//MessageBoxA(null, "CHello.~this()", null, MB_OK);
}
// Note: you can implement your own Init along with this mixin template and your function will automatically override this one
/*
* Performs any intialization of a CHello that's prone to failure
* that we also use internally before exposing the object outside.
* Return Value:
* BOOL true if the function is successful,
* false otherwise.
*/
public BOOL Init() {
//MessageBoxA(null, "CHello.Init()", null, MB_OK);
return true;
}
public
override HRESULT QueryInterface(const (IID)*riid, LPVOID *ppv) {
// wchar[200] lol; auto got = StringFromGUID2(riid, lol.ptr, lol.length); import std.conv;
//MessageBoxA(null, toStringz("CHello.QueryInterface(g: "~to!string(lol[0 .. got])~")"), null, MB_OK);
assert(ppv !is null);
*ppv = null;
import std.traits;
foreach(iface; InterfacesTuple!(typeof(this))) {
static if(hasGuidAttribute!iface()) {
auto guid = getGuidAttribute!iface;
if(*riid == guid.guid) {
*ppv = cast(void*) cast(iface) this;
break;
}
} else static if(is(iface == IUnknown)) {
if (IID_IUnknown == *riid) {
*ppv = cast(void*) cast(IUnknown) this;
break;
}
} else static if(is(iface == IDispatch)) {
if (IID_IDispatch == *riid) {
*ppv = cast(void*) cast(IDispatch) this;
break;
}
}
}
if(*ppv !is null) {
AddRef();
return NOERROR;
} else {
return E_NOINTERFACE;
}
}
public
extern(Windows) ULONG AddRef() {
import core.atomic;
return atomicOp!"+="(*cast(shared)&count, 1);
}
public
extern(Windows) ULONG Release() {
import core.atomic;
LONG lRef = atomicOp!"-="(*cast(shared)&count, 1);
if (lRef == 0) {
// free object
/*
* Tell the housing that an object is going away so it can
* shut down if appropriate.
*/
//MessageBoxA(null, "CHello Destroy()", null, MB_OK);
if (m_pfnDestroy)
(*m_pfnDestroy)();
// delete this;
return 0;
// If we delete this object, then the postinvariant called upon
// return from Release() will fail.
// Just let the GC reap it.
//delete this;
return 0;
}
return cast(ULONG)lRef;
}
LONG count = 0; // object reference count
}