Re: COM and structures - COM Discussion Boards

Imtiaz Murtaza30-Apr-05 6:10

30-Apr-05 6:10

Dear friends,

I developed an ActiveX control using ATL and Visual C++ 7.0. One function exposed by the control takes too many arguments, around 15 in number. As scuh i want to pass structure instead of too many arguments.

But ATL is not giving me any option to add my structure as an argument ot the exposed function ? Please tell me what is the solution of this problem ?

Also i want to use my control by VB/JAvaScript etc. So what is the better way to solve this problem

Imtiaz

Re: COM and structures

rwestgraham1-May-05 10:22

rwestgraham

1-May-05 10:22

Scripting languages do not support structures.

Re: COM and structures

Jörgen Sigvardsson5-May-05 12:52

Jörgen Sigvardsson

5-May-05 12:52

That's like saying "No car can go faster than 200 km/h".

--
Schni Schna Schnappi! Schnappi Schnappi Schnapp!

Re: COM and structures

rwestgraham5-May-05 19:05

rwestgraham

5-May-05 19:05

Jörgen Sigvardsson wrote:
That's like saying "No car can go faster than 200 km/h".

Brilliant observation! A thousand pardons.

VB Script and JavaScript (the scripts mentioned by the original poster as being pertinant) do not support structures.

Robert

Re: COM and structures

Jörgen Sigvardsson5-May-05 20:51

Jörgen Sigvardsson

5-May-05 20:51

I saw the references to VBScript and JavaScript after I posted my reply. I knew then that you meant only those script languages. Blush | :O

--
Schni Schna Schnappi! Schnappi Schnappi Schnapp!

Re: COM and structures

«_Superman_»5-May-05 4:53

«_Superman_»

5-May-05 4:53

You may have to use safe arrays for this.

« Superman »

Re: COM and structures

vishalmore11-May-05 20:57

vishalmore

11-May-05 20:57

Hi Imtiaz ,
Refer to this article from MS-MSDN.

Building ActiveX Controls for Microsoft Windows Using the Active Template
Library

This article is talking about something, which you are looking for.

As far as VB is concern, it must work !
I dont have much idea about scripting languages Frown | :(

This might ease your difficulties !
Smile | :)

Cheers,
Vishal

Re: COM and structures

Imtiaz Murtaza11-May-05 21:57

Imtiaz Murtaza

11-May-05 21:57

Dear Friend,
I tried my best but i was unable to find the article you mentioned. MSDN search is giving me tons of result while i search the topic you mentioned.

Can you please give me the link of this topic.

Thanks

Imtiaz

Re: COM and structures

vishalmore11-May-05 23:08

vishalmore

11-May-05 23:08

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnce21/html/atlce.asp[^]

Cheers,
Vishal

The problem while transfer C to MASM. really need your help.

Anonymous29-Apr-05 20:06

Anonymous

29-Apr-05 20:06

I need the realization of [b] _variant_t(TEXT("a")) on MASM. [/b]
Or any kind of [b] _variant_t() [/b]

Also I need [b]_bstr_t(urllink) [/b]

Please help if you can!

using MSRdp control in windows application

Behlool29-Apr-05 1:44

Behlool

29-Apr-05 1:44

Hi I want to use the MSRdp (Microsoft Remote Desktop control) control from VC windows application but i dont want the control to be visible i want to create it programmatically. i used CoCreateInstance all things goes right and all the functions return S_OK but it doesnot get the session created on server however when i put the MSRdp control on the dialog box and use the same code from there it get connected .... and session is also created on server... Plz reply ASAP

this is the code i used for it

IID IID_RDP =
{0x9059f30f,0x4eb1,0x4bd2,{0x9F ,0xDC,0x36, 0xF4,0x3a, 0x21,0x8F, 0x4A}};

void Connect()
{
::CoInitializeEx(NULL,COINIT_APARTMENTTHREADED);
DISPID dispid =0;

IDispatch* pDisp = NULL;

CString text;
GetDlgItemText(IDC_SERVER,text);
HRESULT hr;

hr = ::CoCreateInstance(IID_RDP,NULL,CLSCTX_SERVER ,IID_IDispatch,(void **)&pDisp);
pDisp->AddRef();

//Setting Username and server
SetProperty(pDisp,OLESTR("Server"),(OLECHAR *)text.AllocSysString());
GetDlgItemText(IDC_USER,text);
SetProperty(pDisp,OLESTR("UserName"),(OLECHAR *)text.AllocSysString());
SetProperty(pDisp,OLESTR("Domain"),(OLECHAR *)"");

//setting password
DISPPARAMS dispparams;
EXCEPINFO escep;
UINT uArgErr =0;

VARIANT Result;
::VariantInit(&Result);
Result.vt =VT_DISPATCH;
dispparams.cArgs = 0;
dispparams.rgvarg = NULL;
dispparams.cNamedArgs = 0;
dispparams.rgdispidNamedArgs = NULL;

OLECHAR *szMem=OLESTR("AdvancedSettings2");
hr = pDisp->GetIDsOfNames(IID_NULL,&szMem,1,::GetUserDefaultLCID(),&dispid);

hr =pDisp->Invoke(dispid,IID_NULL,::GetUserDefaultLCID(),
DISPATCH_PROPERTYGET,&dispparams,&Result,&escep,&uArgErr);

IDispatch *pAdvanced = 0;
pAdvanced = Result.pdispVal;
pAdvanced->AddRef();
GetDlgItemText(IDC_PASSWORD,text);
SetProperty(pAdvanced,OLESTR("ClearTextPassword"),(OLECHAR*)text.AllocSysString());

hr =pAdvanced->Invoke(0x68,IID_NULL,::GetUserDefaultLCID(),
DISPATCH_PROPERTYGET,&dispparams,&Result,&escep,&uArgErr);
BOOL value = Result.boolVal;
//setting startup app
szMem=OLESTR("SecuredSettings");
pDisp->GetIDsOfNames(IID_NULL,&szMem,1,::GetUserDefaultLCID(),&dispid);

hr =pDisp->Invoke(dispid,IID_NULL,::GetUserDefaultLCID(),
DISPATCH_PROPERTYGET,&dispparams,&Result,&escep,&uArgErr);

IDispatch *pSecured = Result.pdispVal;
pSecured->AddRef();
SetProperty(pSecured,OLESTR("StartProgram"),OLESTR("explorer.exe"));

//connecting to server
szMem=OLESTR("Connect");
pDisp->GetIDsOfNames(IID_NULL,&szMem,1,::GetUserDefaultLCID(),&dispid);

hr = pDisp->Invoke(dispid,IID_NULL,::GetUserDefaultLCID(),
DISPATCH_METHOD,&dispparams,&Result,&escep,&uArgErr);
pSecured->Release();
pAdvanced->Release();
pDisp->Release();
return;
}

HRESULT SetProperty(IDispatch* pDispatch, OLECHAR* name , OLECHAR* value)
{
HRESULT hr;
VARIANTARG varg;
::VariantInit(&varg);
OLECHAR* szMem = name;
varg.vt = VT_BSTR;
varg.bstrVal = value;
DISPID dispidNamed = DISPID_PROPERTYPUT;
DISPID dispid;

DISPPARAMS dispparams;

dispparams.cArgs = 1;
dispparams.rgvarg = &varg;
dispparams.cNamedArgs = 1;
dispparams.rgdispidNamedArgs = &dispidNamed;

EXCEPINFO escep;
UINT uArgErr =0;

hr = pDispatch->GetIDsOfNames(IID_NULL,&szMem,1,::GetUserDefaultLCID(),&dispid);
if(SUCCEEDED(hr))
hr =pDispatch->Invoke(dispid,IID_NULL,::GetUserDefaultLCID(),
DISPATCH_PROPERTYPUT,&dispparams,NULL,&escep,&uArgErr);

return hr;
}

Port Blocking for Windows 98!

URagavSouth28-Apr-05 20:10

URagavSouth

28-Apr-05 20:10

Hi,
can I get help on how to block and realse the ports for Win 98 OS. From msdn i found that ipseccmd is the utility that could be used for Windows XP and Windows2000 to block/release ports. Similraly, is there any utility available for Windows 98? Or is there any other method by which I can block/relase ports for Windows 98(i.e, any registry enry that helps in blocking ports)???????
Thnx in advance
Regards
Uthra

URagav
Everything can be sacrificed for truth, but truth cannot be sacrificed for anything .

Outlook CreateDispatch error - "No such interface supported"

Nickmatic28-Apr-05 15:39

Nickmatic

28-Apr-05 15:39

Hello.... have solid, reliable code in C++ that automates Outlook. It has been around for a few years and 99.9% of my users report no problem.

However, occasionally a user reports that they get an error when CreateDispatch() is called. The code is 0x80004002 - No such interface supported.

Sometimes a repair or re-install of the Outlook installation fixes it, most times it does not, and those customers are just out of luck.

Any ideas what might be causing this problem? Of course I can't seem to duplicate it here....

Thanks!
Nicholas

Peculiar Exception

Nirav Doshi28-Apr-05 6:32

Nirav Doshi

28-Apr-05 6:32

Hello,

I'm receiving this very peculiar warning, after which my application crashes.

Warning: constructing COleException, scode = severity: SEVERITY_ERROR, facility: FACILITY_WIN32 ($800706BE).

I'm using Windows XP with SP2. The same application works fine on Windows 2000 SP4.

Googling didn't help at all... Hence posting this query here, just if anyone is aware of or has encountered this error and has some solution for the same.

Thanks,

Nirav

* Artificial intelligence is no match for natural stupidity! *

Re: Peculiar Exception

User 21559728-Apr-05 23:32

User 215597

28-Apr-05 23:32

I think the 800706BE HRESULT code corresponds to
RPC_S_CALL_FAILED

Its defined in winerror.h

Search for this on google.. you might get something. I'll try and find some reason why its not working.

modified 21-Apr-21 21:01pm.

OLE VB Function equilivent for C++?

BrianBoru28-Apr-05 4:42

BrianBoru

28-Apr-05 4:42

Hi All,
Does anyone know of a MFC function equilivant to the OleRequestPendingTimeout function used in VB and V FoxPro? This is to prevent the "This action cannot be completed beause the 'file.doc -Micorsoft Word' program is not responding. Choose 'Switch To' and correct the problem" Message from appearing!

Thanks

Re: OLE VB Function equilivent for C++?

Vi212-May-05 1:42

Vi2

12-May-05 1:42

I don't know the MFC functions, but I know that the VB which tells "This action..." uses the IMessageFilter interface.

With best wishes,
Vita

Throwing an event with a nested UDT

GizzoF28-Apr-05 0:18

GizzoF

28-Apr-05 0:18

Hi!
I'm trying to implement a event that fires an UDT which contains another UDT. I have some doubts and questions. Here is the idl code:

//------------------------------------------------------------------------<br />
typedef enum <br />
{<br />
	S1_item1 = 0,<br />
	// and more ...<br />
}enumSample1;<br />
<br />
//------------------------------------------------------------------------<br />
typedef enum <br />
{<br />
	s2_item1 = 100,<br />
	// and more ...<br />
}enumSample2;<br />
<br />
//------------------------------------------------------------------------<br />
typedef struct<br />
{<br />
	BSTR m_string1;<br />
	// and many more... all BSTRs<br />
<br />
	enumSample1 m_enum1;<br />
	enumSample2 m_enum2;<br />
}st_NestedUDT;<br />
<br />
//------------------------------------------------------------------------<br />
typedef enum<br />
{<br />
	s3_item1 = -1, //<-- Is this ok? <br />
	s3_item2 =  0,<br />
	// and more ...<br />
}enumSample_3;

Q1: Is the s3_item1 ok? I read somewhere that enums are finally unsigned short.

//------------------------------------------------------------------------<br />
typedef struct<br />
{<br />
	enumSample_3 m_eS;<br />
<br />
	// And here is where I want tht st_NestedUDT. <br />
	// st_NestedUDT m_stNested;<br />
	// VARIANT m_vntNested;<br />
}st_MainStruct

Q2: Should be the nested UDT member a VARIANT or just a st_NestedUDT member?

//------------------------------------------------------------------------
And the event is like:

[id(2), helpstring("method OnNewOrder")] HRESULT OnNewOrder(st_MainStruct stInfo);

And finally, how should I encapsulate the stInfo in order to call Invoke? My first thought was:

IRecordInfo * pRI;<br />
<br />
hr = GetRecordInfoFromGuids(LIBID_MyLibraryLib, 1, 0, 0, IID_st_Main_Struct, &pRI);<br />
if(FAILED(hr))<br />
	return hr;<br />
<br />
CComVariant avarParams[1];<br />
avarParams[0].vt = VT_RECORD;<br />
avarParams[0].pvRecord = stInfo;<br />
avarParams[0].pRecInfo = pRI;<br />
	<br />
CComVariant varResult;<br />
<br />
<br />
DISPPARAMS params = { avarParams, NULL, 1, 0 };<br />
hr = pConnection->Invoke(2, IID_NULL, LOCALE_USER_DEFAULT, DISPATCH_METHOD, ¶ms, &varResult, NULL, NULL);

Q3: Is that right?

Thank you in advance
Gizzo

Properties in COM

ckapil27-Apr-05 23:12

ckapil

27-Apr-05 23:12

Hello All,

I am new to COM world.

In COM is it possible to have a property with two parameters? For example:

GetValue(index, Value)
PutValue(index, Value)

Does COM allow this kind of definition in IDL file. What are pro and cons of this definition. If i declare a property with two paramters, how I will be able to use it in say C++?

Any one? Any idea?

Thanks in advance,

Re: Properties in COM

ThatsAlok28-Apr-05 0:37

ThatsAlok

28-Apr-05 0:37

ckapil wrote:
In COM is it possible to have a property with two parameters?

Yes you can put it!

ckapil wrote:
Does COM allow this kind of definition in IDL file.
I am working on it,Will send you Source Code and Sample Application, if i am SuccessFul!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

Re: Properties in COM

ThatsAlok28-Apr-05 1:03

ThatsAlok

28-Apr-05 1:03

Good News for you!
i Successfully Created the Com Dll and Client Exe using double parameter Property!.

please send me your Email so that i send it to you!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

Re: Properties in COM

ckapil28-Apr-05 1:24

ckapil

28-Apr-05 1:24

ckapil@graubardesign.com

IStream object string length error

mjharvey27-Apr-05 14:09

mjharvey

27-Apr-05 14:09

I am trying to update an ISequentialStream object in a RowSet in SQL Server. But am getting the following errors:

- Multiple-step OLE DB operation generated errors. Check each OLE DB status value, if available. No work was done.
- String data, length mismatch

The "String data, length mismatch" one is troubling me. And I think it has something to do with the way I am creating the stream. This is the methodology I am trying to implement:

IStream *pIStream;
CreateStreamOnHGlobal(NULL, true, &pIStream);
pIStream->SetSize(x);
pIStream->Write(databuf, databuf_len, &byteswritten);
ISequentialStream *pISeqStream;
pIStream->QueryInterface(IID_ISequentialStream, (void **)&pISeqStream);

I am struggling with the length. As to what it should be set to. I have done a simple test to try and write a 6 character string. The size of the stream created is 6 bytes and I have set the size of the length in the bindings for the rowset to be 6. Yet I am getting a string length error on Update ...does a null terminator for the string have to be allowed for somewhere.

Any help on what I may be doing wrong here would be appreciated. Thanks.

Re: IStream object string length error

mjharvey27-Apr-05 16:45

mjharvey

27-Apr-05 16:45

If I do an GlobalAlloc and copy the data into this block of memory and pass that to the CreateStreamOnHGlobal function instead of using the IStream->Write function it works without an error.

But as far as I can tell, the size of the streams created using both methods are the same, and the memory allocated to each is the same.

Making DLL from Matlab

mosquets27-Apr-05 3:39

mosquets

27-Apr-05 3:39

I am trying to build a shared library (DLL) from m-File.The problem is that I need to use the graphics library.I know that I must bundle the libmwsglm.mlib library(using the command mcc) but I couldn't find how do it . Now I'm looking for a way to create a .dll (using graphics library)and after use it for example in C#.I think that somebody can help me and your help will be very useful for me.
Regards,
Marcel

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