Re: Converting TCHAR to BSTR with ATL - COM Discussion Boards

Lily1830-Jul-02 8:49

30-Jul-02 8:49

I need to use activex dll created in vb in a C++ program. I use vc 6.
Here is what I do:

#import " MADLL1.dll"  \<br />
     named_guids no_implementation \<br />
     raw_interfaces_only raw_native_types<br />
using namespace MADLL1;<br />
<br />
#import " MADLL2.dll" no_implementation \<br />
			no_auto_exclude \<br />
			raw_native_types raw_interfaces_only \<br />
			named_guids  <br />
using namespace MADLL2;<br />
<br />
#import " MADLL3.dll" no_implementation \<br />
		   no_auto_exclude \<br />
	          raw_native_types raw_interfaces_only \<br />
		named_guids  rename("SOMETHING"," SOMETHINGX") \<br />
		rename(" SOMETHINGELSE", " SOMETHINGELSE X") \<br />
		<br />
using namespace MADLL3;

My problem is with the third dll. I put rename because I had compilation errors.I taught It was name collision.
I did help with these variable but I have still alot of erros of the same kind:
Ex :
c:\inwork\opc_da_clientmerge\debug\OLEGEUSE.tlh(729) : error C2059: syntax error : 'constant'
enum TT_SOMETHING
{
TTDT_ONE = 0,///Here I should rename these variables
TTDT_TWO= 1,
TTDT_THREE= 2,
TTDT_FOUR= 3
};

Is it normal to rename everything? I don't think so.
Here is how I want to use the dll:

HRESULT hresult;<br />
CLSID clsid;<br />
<br />
CoInitialize(NULL);	//initialize COM library<br />
hresult=CLSIDFromProgID(OLESTR("madll.clsConnexion"), &clsid);    //retrieve CLSID of component<br />
if(FAILED(hresult))<br />
{<br />
	<br />
	TRACE_MSG(_T("CDataBD:: GetTypeAttr"),hresult);<br />
	return hresult;<br />
}		<br />
_clsConnexion *ConDll;      //fromdll1<br />
_clsError *Error;                 //fromdll3<br />
hresult=CoCreateInstance(clsid,NULL,CLSCTX_INPROC_SERVER,__uuidof(_clsConnexion),(LPVOID *) &t);<br />
if(FAILED(hresult))<br />
{<br />
	TRACE_MSG(_T("CDataBD:: GetTypeAttr"),hresult);<br />
	return hresult;<br />
}

//to this point everything works
but for the rest I have to load the third dll to test it

ConDll ->LoadData("01", "L4", 0, 0, m_Line, "OLE.MachineS", ADO_OLEDB, Error);<br />
ConDll->Release();   //call method<br />
CoUninitialize();  //Unintialize the COM library

I also tried with IDispatch

OLECHAR* name = OLESTR("LoadData"); <br />
HRESULT hr2 = pDispatch->GetIDsOfNames(IID_NULL,<br />
					&name,<br />
					1,<br />
					GetUserDefaultLCID(),<br />
					&dispid);

Thinking I could use Invoke....
But I received :

DISP_E_UNKNOWNNAME

I'm able to use these Interfaces :
ITypeLib
ITypeInfo
I have access to info from the lib but not Invoke...
You see that I tried different approches without success.
Is it me that don't understand or could it be how the dll was created?

I have access to source code from dll but can't change anything.

Hope somebody could help me
Regards
Lily

Re: compilation problem with #import

Gertjan Schuurmans4-Aug-02 3:12

Gertjan Schuurmans

4-Aug-02 3:12

Hi there,

My guess is that MADLL3 typelibrary implicitly imports typelibs of MADLL2 or MADLL1, this causes all kinds of typedefs to be duplicated in the generated .tlh and .tli files.

Gertjan

How to do this in MFC

Anonymous29-Jul-02 21:03

Anonymous

29-Jul-02 21:03

when make a ComAddin:
in VB
Private Sub AddinInstance_OnConnection(ByVal Application As Object,
ByVal ConnectMode As AddInDesignerObjects.ext_ConnectMode,
ByVal AddInInst As Object,
custom() As Variant)

AddInInst.object = Me

End Sub

in MFC

STDMETHODIMP CMyAddin::OnConnection(IDispatch* Application,
ext_ConnectMode ConnectMode,
IDispatch* AddInInst,
LPSAFEARRAY* custom)
{

return S_OK;
}

Question is :
How to do (AddInInst.object = Me) in the MFC?

How to Call ComAddin's function from MACRO?

Gheyret29-Jul-02 19:14

Gheyret

29-Jul-02 19:14

Please help me.

How to Call ComAddin's function from VBA MACRO?

Converting TCHAR to BSTR with ATL

alma29-Jul-02 2:40

alma

29-Jul-02 2:40

I have to convert a TCHAR string to BSTR in an ATL based service without using MFC.

I tried T2OLE, but I could not compile the project because some errors:
'_lpa' : undeclared identifier, ...

Could anyone help me out?

Alma

Re: Converting TCHAR to BSTR with ATL

Vi229-Jul-02 2:47

Vi2

29-Jul-02 2:47

You can use CComBSTR class to make this conversion.
CComBSTR bstrString( tcharString );
or
bstrString = tcharOtherString;

With best wishes,
Vita

Re: Converting TCHAR to BSTR with ATL

alma29-Jul-02 2:59

alma

29-Jul-02 2:59

It worked, thanx

Re: Converting TCHAR to BSTR with ATL

Michael Dunn29-Jul-02 21:08

Michael Dunn

29-Jul-02 21:08

The string conversion macros require that you put the USES_CONVERSION; macro at the beginning of the function/block.

--Mike--
Just released - RightClick-Encrypt v1.3 - Adds fast & easy file encryption to Explorer
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Re: Converting TCHAR to BSTR with ATL

Mark Janveaux4-Aug-02 20:37

Mark Janveaux

4-Aug-02 20:37

Your getting this error because your not using the USES_CONVERSION macro in your functions that use the T2OLE macro. For example:

void myfunc(LPTSTR szIN, BSTR* bszOut){
USES_CONVERSION;
bszOut = T2OLE(szIN);
}

Hope that helps.

Re: Converting TCHAR to BSTR with ATL

alma4-Aug-02 21:58

alma

4-Aug-02 21:58

Yep, it workes this way. Thanks.

PropertyPage

Naveen_mah29-Jul-02 1:16

Naveen_mah

29-Jul-02 1:16

Hi!
I am new to COM / ATL and just trying to learn that...
I want to have a ATL COM Component with a dialog box with all its message handeling in it and want to show up that dialog in some other Client app using some interface etc.
Pls tell me how to do that. I will be thankful if you can give me detailed tutorial kind ....specifying all steps ..as I am new to it.

One more another question....

Actually my need is that my client ( a win32 SDK project without MFC) has a method which adds property Sheets and all it needs is a Dialog Resource ID and Callback function of that dialog to add propertysheet to existing propertysheet. Now I want a com dll having that property sheet. I would like to know how to do that ...Pls help . What I should do to make COM Dll and how to get Dialog ID and callback function in Client...
I would love to have some code/ project examples

thanks
Naveen

Implementing IDispatch::GetIDSOfNames

Alex Cramer28-Jul-02 22:18

Alex Cramer

28-Jul-02 22:18

I need to implement IDispatch::GetIDSOfNames without creating type library, i.e. I need to return certain ID for certain name. How??

Re: Implementing IDispatch::GetIDSOfNames

Vi229-Jul-02 2:53

Vi2

29-Jul-02 2:53

You must implement your version of GetIDsOfNames and correlate it with Invoke. Also you must implement the GetTypeInfoCount and GetTypeInfo to return E_NOTIMPL. And last, you should describe your interface as empty interface, derived from IDispatch.

With best wishes,
Vita

Re: Implementing IDispatch::GetIDSOfNames

Alex Cramer29-Jul-02 17:05

Alex Cramer

29-Jul-02 17:05

Yes, thanks, but can I ask some more about memory management. How to allocate memory in IDispatch::GetIDSOfNames implementation? (hich function is needed?)

Re: Implementing IDispatch::GetIDSOfNames

Vi229-Jul-02 18:19

Vi2

29-Jul-02 18:19

I do not see any problem with memory. GetIDSOfNames does not return any memory pointer. If you want to allocate the internal buffers's memory then you can use any strategy you want.

With best wishes,
Vita

Re: Implementing IDispatch::GetIDSOfNames

Alex Cramer29-Jul-02 18:48

Alex Cramer

29-Jul-02 18:48

Sorry, I thought I must allocate memory for rgDispId. Now all correct!

P.S. Russian programmers answered me for the my last 4 questions. Hm...

Re: Implementing IDispatch::GetIDSOfNames

Vi229-Jul-02 19:05

Vi2

29-Jul-02 19:05

Welcome on www.RSDN.ru, if you can read the Russian text.

With best wishes,
Vita

Re: Implementing IDispatch::GetIDSOfNames

Alex Cramer29-Jul-02 20:34

Alex Cramer

29-Jul-02 20:34

Yeah... My nick is ADK there...

Call Addin's Function From VBA Macro

Anonymous28-Jul-02 21:16

Anonymous

28-Jul-02 21:16

Hello.
Sorry my poor english.
My question is how to Call ComAddin Function from VBA Macro if ComAddin is maked by using MFC C++;
I know how to call ComAddin function from VBA if ComAddin is maked by using VB.

class factories (simple COM server)

Roman Nurik28-Jul-02 19:26

Roman Nurik

28-Jul-02 19:26

is it good practice, or even possible, to have one class factory produce instances of many different COM classes?

i'm trying to make a scripting engine using IActiveScript and such, but i have multiple COM classes implementing IActiveScript, IActiveScriptSite, etc... but I don't want to have a class factory for each one

any thoughts?

- Roman -

Re: class factories (simple COM server)

Vi229-Jul-02 2:42

Vi2

29-Jul-02 2:42

By definition, as the class factory the class object of some class must produce the many instances of that and only that class.

COM standard CoCreateInstance and CoGetClassObject fucntions realize this strategy with IClassFactory interface. But the class object can have another interface by which you can create any other objects as well.

With best wishes,
Vita

Re: class factories (simple COM server)

Roman Nurik29-Jul-02 6:27

Roman Nurik

29-Jul-02 6:27

So I need many factories? i didn't understand the second part of your message, thanks anyway Smile | :)

- Roman -

Re: class factories (simple COM server)

Vi229-Jul-02 19:02

Vi2

29-Jul-02 19:02

A creation of a COM object begins from the creation of the its class object via CoGetClassObject(CLSID,context,NULL,IID_Ix,(void**)&pCoObj) where CocreateInstance uses IID_Ix is equal IID_IClassFactory. So created object is called a class factory object. Then CoCreateInstance uses pCoObj->IClassFactory::CreateInstance(pUnkOuter, IID_Iy, (void**)ppObj) to create a COM object with interface Iy.

Nobody prevents you to use other interface which let you create some COM objects, which may belong to different classes, by calling of some Ix function with some parameter - pCoObj->Ix::FuncCreate(BSTR type, IActiveScript* *ppScript).

Or create alone object M which will be a manager of your objects by previous scheme of a class object.

With best wishes,
Vita

Loadxml error

suresh_sathya28-Jul-02 18:52

suresh_sathya

28-Jul-02 18:52

Hi,
I am having some content in textfile.iam reading the content from file by using API called Read file.I convert this string to bstr using (_bstr_t)string and then i called the method LoadXML(string,bool).But when iam parsing this iam not getting output.
why it is so.

Thanks in advance.

ICUSTOMDOWNLOAD implementation info

Dazza28-Jul-02 2:57

Dazza

28-Jul-02 2:57

Hi,

I'm a newbie here and I was hoping if anyone knew ANYTHING about the ICustomDownload interface. It's a COM interface for allowing control of downloads from Internet Explorer. I think it was introduced for IE v5.5 or something.

I read something about it in MSDN, but I can't seem to find it anymore - plus it didn't show enough info.

You've probably seen programs like GetRight, GoZilla and DAP which I think implement this interface.

Cheers

Dazza

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