MS Excel 10.0 object library - COM Discussion Boards

Strange behavior of BSTRs in DCOM

morenz12-May-05 3:01

morenz

12-May-05 3:01

Hi Folks

)
i've got a strange problem with BSTRs in my DCOM application.
I'm passing 6 BSTRs in a class object (its properties) to a method on a remote server that has to write these strings in some registry values on a pre-defined key.
I've tried both allocating a BSTR and passing it to the server function (see next few lines

BSTR bsBuffer;

bsBuffer=SysAllocString(OLESTR("Prova"));
theApp.m_pHello->SetName(bsBuffer);
SysFreeString(bsBuffer);

and calling server functions directly passing a string (confiding in the operator= that BSTR involves).

theApp.m_pHello->SetDescription("Prova 02/05/2005");

theApp.m_pHello->SetDriver("0.01a");

theApp.m_pHello->SetName("Prova");

theApp.m_pHello->SetVendor("Execute, Crash & Sigh LTD");

theApp.m_pHello->SetLocalBus("VXI");

theApp.m_pHello->SetFirmware("0.00001a");

//Adding Object
theApp.m_pHello->Add();

Running application there is no errors, no code violations, no abnormal program terminations, NOTHING....

BUT

In the registry I get a strange thing like this (I report values in tabular format)

sDesc=Execute, Crash & Sigh LTD
sDriver=0.00001a
sFirmware=0.00001a
sLocalBus=0.00001a
sName=0.00001a
sVendor=Execute, Crash & Sigh LTD

All server functions do nothing but extract the string part in the BSTR and save it in the registry using Windows API functions.

What can I do?
What can it be?

Thanks a lot in advance,
Moreno.

Re: Strange behavior of BSTRs in DCOM

Indagro12-May-05 20:54

Indagro

12-May-05 20:54

Try the first one an don't free the Memory (SysFreeString)

Best now?

Re: Strange behavior of BSTRs in DCOM

morenz16-May-05 5:19

morenz

16-May-05 5:19

OK, I will not free the memory soon, but WHEN can I free that memory?
I don't want to make a memory-consuming server... Laugh | :laugh:

Thanx again....

Re: Strange behavior of BSTRs in DCOM

Indagro18-May-05 23:35

Indagro

18-May-05 23:35

Marshaling layer in COM do free for you in the client side if parameter is [in] type and in server side in [out] parameter. You must free memory (SysfreeString) in client side for [out] parameter,...

Try to use _bstr_t type and forget memory alloc and free.

Regards...

Re: Strange behavior of BSTRs in DCOM

morenz20-May-05 13:08

morenz

20-May-05 13:08

OK, I tried to follow your tip and went into trouble again (i'm not SO experienced Laugh | :laugh:

).
Most of my server Interface's methods use the BSTR type. I tried to change it, but now I need to know how to declare the _bstr_t type in my IDL file. I tried using both import and include (with and without #) WTYPES.H (where _bstr_t is defined) and it seemed not to work (preprocessor error). How to declare it?

Another STRAAAAANGE thing is that it fails calling methods that has three int parameters... I know that native C types do not need to be marsaled, am I right?
i.e.:

theApp.m_pIHello->SetLocation (2,1,0)

seems to fail, where function prototype in server side is

STDMETHODTYPE CHardwareAsset::SetLocation (int Master, int slot, int SubAssy)

I put a statement to log on a file somw phrases just to know where the program goes and what it does, but when I call the method above, the server creates the object, but does NOT log the SetLocation Fu8nction (the logFile statement is the first, just before variable declaration!)

Very strange, isn't it? Or it's me that need to return to school and study a lot? Laugh | :laugh:

Thanks again...

Re: Strange behavior of BSTRs in DCOM

Vi212-May-05 21:08

Vi2

12-May-05 21:08

Looks like the theApp.m_pHello object doesn't rightly store the transmitted BSTR strings inside.
BSTR strings should be stored by copying of the body, not the pointer.

HRESULT C::SetName(IN BSTR name) <br />
{<br />
  m_nameSaved = name; // It's invalid. Should be m_nameSaved = SysAllocString(name); or other equivalent.<br />
}<br />
<br />
HRESULT C::Add()<br />
{<br />
  // using m_nameSaved as stored string<br />
}

With best wishes,
Vita

Re: Strange behavior of BSTRs in DCOM

morenz16-May-05 2:52

morenz

16-May-05 2:52

OK, and that's what I did, but now that I think, I should do the same thing not only on client side, but also on server side....

I'll give it a shot, and I'll report how things went....

Thanks again...

MS Excel 10.0 object library

Member 164882912-May-05 0:55

Member 1648829

12-May-05 0:55

I've been successfully using the MS Excel 9.0 object library for some time now to perform simple tasks manipulating excel. However I now only have the version 10.0 library available. I assumed there would be backwards compatibility but I am having issues. When refreing to cell contents I used to use .value but this seems to have disapeared in version 10 which only seems to have .value2???

Has anyone seen this issue before?

Need help in NetMeeting Desktop Sharing

shainisnair12-May-05 0:46

shainisnair

12-May-05 0:46

Hi,
I am writing an application which will work as client as Microsoft Netmeeting 3.0 using the interfaces exposed by NetMeeting SDK.

I have created a conference and hosted that. When i am getting the Sharable Application list through IEnumNmSharableApp::Next() API, I am getting all the running application handles in my machine and I am able to share the applications. I want to share my desktop, but I am not getting the handle to the running Desktop so that I can share the desktop. Is there any way I can get the handle to my desktop and share it so that any body joins the conference will be able to see my desktop.

Any help from any one will be highly appreciated.

Thanks & Regards
Shaini

Using two .tlb files which has same class/interface

jabhi197411-May-05 21:26

jabhi1974

11-May-05 21:26

Hi All,
I am implementing an MFC application which is using two COM DLL(say First.dll and Second.dll) files.
Both Dlls are having same coclass name and interfaces.Only their GUIDs are different.

To do the above, I have imported the tlb files for btoh the dlls i.e. A.tlb and B.tlb.

In the MFC application,I am using these interfaces like

CComPtr<isamename> m_pSameName;
m_pSameName.CoCreateInstance(__uuidof(SameName));

But the above was giving ambiguous error.To remove the error,I tried by importing type library without no_namespace attribute. And modified the above code to..

CComPtr<alib::isamename> m_pASameName;
m_pASameName.CoCreateInstance(__uuidof(SameName));

CComPtr<blib::isamename> m_pBSameName;
m_pBSameName.CoCreateInstance(__uuidof(SameName));

But this code appears that so much code to be in repetition as above.
Please suggest me to approach any better way to avoid these repetition.

Regards
jabhi1974

Re: Using two .tlb files which has same class/interface

Indagro12-May-05 21:08

Indagro

12-May-05 21:08

Maybe this work?

#import "A.tlb" named_guids
#import "B.tlb" named_guids

CComPtr<alib::samename> m_pASameName;
CComPtr<blib::samename> m_pBSameName;

...with the right names obviously

MTS packages

Pavneet Singh10-May-05 0:58

Pavneet Singh

10-May-05 0:58

I am complete newbie in this field. I need to install DLL in MTS via VC++ 6.0 program. Any help is appreciable.
Thanks in advance.

Re: MTS packages

Rizwan Bashir10-May-05 23:22

Rizwan Bashir

10-May-05 23:22

What you mean.... you need to install the files in MTS via VC or you have build the COM in VC and want to install on MTS ?

any ways install the component on MTS and then export the package. which will give you the installation package for clients. which you can run to install on clients..run it through your VC program...

Re: MTS packages

Pavneet Singh12-May-05 9:03

Pavneet Singh

12-May-05 9:03

I want to perform all the steps of installation in MTS, exporting the package programmatically. Need a one-click go stuff.

Re: MTS packages

Rizwan Bashir12-May-05 22:34

Rizwan Bashir

12-May-05 22:34

well Pavneet I dont know exactly why you want to do this. What I used to do is the following
on my test machine I create a package in Transaction Server. then I export it as a server side package. Now this package can be installed on client and server both. So your setup is ready for transaction server for client. Now go to your Setup builder (install shield ,wise or dotnet built-in package builder ) and include this package to run at the end of the setup and give that package to client. when CLient will install the application the Components will be installed automatically with that. Why you want that client will install your application then he will get a new package from MTS to install on different machines.
if this helps you then great if not then wait for some one else who knows how to do this....

COM+ association with Date

Rizwan Bashir7-May-05 2:03

Rizwan Bashir

7-May-05 2:03

Hye Guys
I have deployed one distributed project. Client Side installation Plus Server Side (Transaction Server). when I use the object it works fine. next day it was not working without any reason (Server Components only). I tried hard uninstalled/reinstalled not working and some how accidently I came to know if I change the date of the system to the installation date. then it works fine. So I changed the date to installation date which worked successfully. So every time I have to run the application I need to change the date of my machine then it works fine other wise error
ActiveX Object Component create Object..429...

is there any communication or relation between date and COM Objects ??????
if yes which looks under my scenrio... then what is the solution...

Embed Exectuable

zx2c46-May-05 15:16

zx2c4

6-May-05 15:16

Any idea how to embed an exectuable inside another executable, and then from with in your program, call the embeded exectuable with out creating another process or wrting the embed exectuable to disk?

I have a C++ program (straight C++, not managed). It has some logic and then depending on a number of conditions, ShellExecute()s another exectble file (client.exe), which happens to be a .net file. Is there anyway that I can add this client.exe file as a resource of my C++ program, and then call the beginning of the code from within the C++ program, so I wouldn't have to extract the resource or create a new process

Please help

Thanks,
Jason A. Donenfeld

PS: This is what I have now:

<br />
#define WIN32_LEAN_AND_MEAN<br />
#include<br />
#include<br />
#include<br />
<br />
#define INSTANCEMESSAGE "ShowZIM"<br />
#define WINDOW_TITLE "ZX2C4InstantMessenger"<br />
#define MUTEX_STRING "Local\\ZX2C4IM"<br />
#define FILE "client.exe"<br />
<br />
int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)<br />
{<br />
if(_tcscmp(lpCmdLine,"clone"))<br />
{<br />
CreateMutex(NULL,TRUE,MUTEX_STRING);<br />
if(GetLastError()==ERROR_ALREADY_EXISTS)<br />
{<br />
SendMessage(FindWindow(NULL, WINDOW_TITLE), RegisterWindowMessage(INSTANCEMESSAGE), NULL, NULL);<br />
return 0;<br />
}<br />
}<br />
ShellExecute(NULL,NULL,FILE,lpCmdLine,NULL,SW_SHOW);<br />
return 0;<br />
}<br />

Re: Embed Exectuable

Jörgen Sigvardsson6-May-05 23:21

Jörgen Sigvardsson

6-May-05 23:21

Why would you want to embed an executable? Confused | :confused:

If you need your code to be in your main executable, then compile it in at source level. I.e., call your code via function(s).

--
Schni Schna Schnappi! Schnappi Schnappi Schnapp!

Re: Embed Exectuable

zx2c47-May-05 5:52

zx2c4

7-May-05 5:52

I'm trying to have the program start in C++, and then if certain conditions are met, I want it to start calling the .net code. .Net is way slow, so I want the conditions to be checked with C++, so the runtime isn't started if the .net code isn't to be executed. I know I could just ShellExecute another executable, but that seems so sloppy.

How to initialize a ActiveX picture?

ben.tsang6-May-05 3:44

ben.tsang

6-May-05 3:44

Hi,All

I am developing a GDI graphics ActiveX Control with atl, it has a picture property.How can i set the picture value when i create the bitmap every time in the function OnDraw, the following is the my snippet code:

HRESULT OnDraw(ATL_DRAWINFO& di)
{
Graphics graphics(di.hdcDraw);
RECT& rc = *(RECT*)di.prcBounds;
Height = rc.bottom-rc.top;
Width = rc.right-rc.left;

Bitmap bmp(Width,Height);
Graphics * pMemoryGraphics=Graphics::FromImage(&bmp);
MyImage * img= new MyImage();
img->DrawGraphics(pMemoryGraphics); // draw the graphics
graphics.DrawImage(&bmp,rc.left,rc.top);
// here i created the bitmap "bmp", how to pass it to m_mPicture?
// CComPtr<ipicturedisp> m_pPicture;

I am very appreicated if someone can help.

Eric

Can't Seem To Use COM+ By Remoting

micdevnet5-May-05 23:02

micdevnet

5-May-05 23:02

I am having error as displayed below :-

System.Runtime.Remoting.RemotingException: Cannot load type MyRemoteCom1.MyRemot
eCom, RemoteComObj.
at System.Runtime.Remoting.RemotingConfigInfo.LoadType(String typeName, Strin
g assemblyName)
at System.Runtime.Remoting.RemotingConfigInfo.GetServerTypeForUri(String URI)

at System.Runtime.Remoting.RemotingConfigHandler.GetServerTypeForUri(String U
RI)
at System.Runtime.Remoting.RemotingServices.GetServerTypeForUri(String URI)
at System.Runtime.Remoting.Channels.Http.HttpRemotingHandler.CanServiceReques
t(HttpContext context)
at System.Runtime.Remoting.Channels.Http.HttpRemotingHandler.InternalProcessR
equest(HttpContext context)

I can't seem to be able to invoke a method that is actually a serviced component located in another server by using .Net Remoting

My codes are as such :-
For my client application calling the object :-
IMyRemoteCom objIMyRemoteCom = null;

try
{
objIMyRemoteCom = (IMyRemoteCom)Activator.GetObject(typeof(IMyRemoteCom), "http://127.0.0.1/ComRemoteServer/MyRemoteCom.rem");
Console.WriteLine(objIMyRemoteCom.RetrieveString());
}
catch ( Exception ex )
{
Console.WriteLine(ex.Message.Trim());
}
finally
{
objIMyRemoteCom = null;
}

Console.ReadLine();

For my COM+ Object :-
namespace MyRemoteCom1
{
///

/// Summary description for MyRemoteCom.
///

#region COM+ Declaration
[Transaction(TransactionOption.Supported)]
[Guid("16073B03-F2DF-4028-AFB8-8D001DB6F62A")]
[EventTrackingEnabled(true)]
[ObjectPooling(true, 2, 1000)]
#endregion
public class MyRemoteCom : ServicedComponent, IMyRemoteCom
{
#region Public : Constructor
public MyRemoteCom()
{
//
// TODO: Add constructor logic here
//
}
#endregion

#region Public : String : RetrieveString
public string RetrieveString()
{
return "MyRemoteCom Version 1.0.0.0";
}
#endregion
}
}

For my interface object :-
namespace MyRemoteCom1
{
///

/// Summary description for Class1.
///

public interface IMyRemoteCom
{
string RetrieveString();
}
}

For my config :-
wellknown mode="SingleCall" type="MyRemoteCom1.MyRemoteCom, RemoteComObj" objectUri="MyRemoteCom.rem"

~MicDevNet~configuration>

Please help Cry | :((

~MicDevNet~configuration>

Please help Cry | :((

~MicDevNet~

How I Read MBR Master Boot Record

shahzad Ahmed5-May-05 21:18

shahzad Ahmed

5-May-05 21:18

Dear friends,<br />
<br />
I am using Windows 2000 Professional & XP 2000<br />
And I want to Access my Hard disk Sectors & Cluster, <br />
I Used CreateFile ("\\\\.\\C:",….) & ReadFile () Functions for read a Particular Drive only Sectors<br />
<br />
I Used CreateFile("\\\\.\\PhysicalDrive0",….) & ReadFile() Function this Cannot work Handle Cannot Create Successfully<br />
<br />
Now My problem is that I want to read MBR & Some Other Starting Sectors of My Hard disk Please Tell me what Can I do for That.<br />
<br />
Advance <br />
Thanks <br />
Shaizi

Virtual memory Allocation

ckkmohan3-May-05 2:55

ckkmohan

3-May-05 2:55

I have problem with ATL COM exe

First I build the exe in Win32UnicodeReleaseMinDependancy settings , seems to be allocating 13324 k virtual memory (VM) at startup and then it allocates 1.8 GB which grows up to 1.9 GB of VM
but at the same time exe build in Win32UnicodeDebug settings allocates only 1160 k at startup and allocates 1672k VM , which increases slowly

Previous version of the same exe is working properly (allocating less amount of virtual memory ) and I compared all the project setting of new exe with older one both are same

Can any one suggest me why exe build in
Win32UnicodeReleaseMinDependancy allocates 1.9 Gb of virtual memory ???

Re: Virtual memory Allocation

James R. Twine6-May-05 8:33

James R. Twine

6-May-05 8:33

   Programming Error? Doing things like abusing dynamically allocated memory (misusing string objects, etc.) will do things like that.

   Also, double check for dangling (un-released) interface pointers. For example, I once had an issue with an OleDB object that was getting binary data from a database table. I was not releasing the IStream interface pointer I was getting back, and after about 20-50 records, the memory allocations started to skyrocket!

   Behaved completely differently under DEBUG than RELEASE.

   Peace!

-=- James

If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
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Urgent! How to instanciate an OCX ?

turenne2-May-05 11:49

turenne

2-May-05 11:49

I've made an OCX control. It works fine OK.

I want to instanciate that OCX when a .fbx file is dropped from file explorer on an Office application ... How can I do that?

Ex: In a PowerPoint slide I want to drop from file explorer myfile.fbx and this will instanciate
my FbxViewer.ocx in the PP slide and myfile.fbx will be loaded into my OCX control.

Thanks

Danny
______

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