Safearray with byte data - COM Discussion Boards

gharrison25-Jul-02 0:36

25-Jul-02 0:36

If I have call a COM object in an in-process server, which modifies a pointer, passed to it, in a worker thread as followers.

CoInitialize( NULL );

IProfile Profile;
Profile.CreateDispatch(_T("AutomationDispatch.Profile"));

int Size = Profile.GetDataSize();
double * pData = new double[ Size ];

Profile.GetData( pData );

Every works OK.

But if I call CoInitialize( NULL ) in the main thread before creating the worker thread. Then I get the following run-time error

Heap block at 00148698 modified at 001486A8 past requested size of 8.

When I debug the code, the pointer memory address passed to the COM object is changed in the COM object implementation.

If I pass the address of the pointer to COM object. Then there are no heap errors. I assume this because the address is passed by value.

Re: Client Worker threads

Ernest Laurentin27-Jul-02 12:46

Ernest Laurentin

27-Jul-02 12:46

Since you are planning to pass your COM object to different thread, call CoInitializeEx(NULL, COINIT_MULTITHREADED);. Your worker thread need to call CoInitialize(NULL) too.

COM,Socket,ASP

eyedia24-Jul-02 21:06

eyedia

24-Jul-02 21:06

:(I have one COM with function Connect(string,integer) which connects to a Socket Server,and property, Status which returns integer.The COM is working fine with VB.But not working with ASP.but it is returning status from the COM.I tried with one more property which returns string.That is also returning perfactly.
My Conclusion is there might be some type conversion problem.Can anyone suggest anything please.And one more problem is the dll remains in use ,if i close the page also.

Big D

Hidden dialog from Dll

Atin Kumar24-Jul-02 18:06

Atin Kumar

24-Jul-02 18:06

Hi,
I am facing a problem.

Following is the description:

I have a COM server(EXE).

It has a method, "ServerMethodAAA". The "ServerMethodAAA" method, calls a Dll function, "DllFuncDlg()". "DllFuncDlg()" function invokes a dialog box.

I have a client app for my COM Server, which loads COM Server in hidden mode.

Problem:

When client calls method, "ServerMethodAAA", the dialog is displayed in hidden mode. That is, behind client application. I want that dialog should appear in fore ground window.

Please suggest me.

Regards.

Re: Hidden dialog from Dll

Ernest Laurentin27-Jul-02 12:48

Ernest Laurentin

27-Jul-02 12:48

Did you try SetForegroundWindow function?

Re: Hidden dialog from Dll

Atin Kumar28-Jul-02 15:35

Atin Kumar

28-Jul-02 15:35

Thanks for your reply.

I have tried doing following in Initdialog

this->EnableWindow(TRUE);
this->ShowWindow(SW_SHOW|SW_SHOWNORMAL);
SetForegroundWindow();
BringWindowToTop();

But, no use.

Regards.

method executing too many times

mgriffith24-Jul-02 8:09

mgriffith

24-Jul-02 8:09

i just asked this on the visual c++ forum, but i think this is probably a better place to ask....here goes nothing

i have 2 methods that are using IWebBrowser2 to execute a print method from a com object that is hosted on a webpage. here is the code for the methods:

---------------------------------

STDMETHODIMP CTemplatePrinter::IEPrintNoPrompt(VARIANT varTemplateURL)
{
CComPtr<iolecontainer> spContainer;
CComPtr<iserviceprovider> spSP;
CComPtr<iwebbrowser2> spWB;
CComPtr<idispatch> spDisp;
CComPtr<ihtmldocument2> spDoc;
CComPtr<iolecommandtarget> spCT;
CComVariant vPTPath = varTemplateURL;

m_spClientSite->GetContainer(&spContainer);
spContainer->QueryInterface(IID_IServiceProvider, (void**)&spSP);
spSP->QueryService(SID_SWebBrowserApp, IID_IWebBrowser, (void**)&spWB);
spWB->get_Document(&spDisp);
spDisp->QueryInterface(IID_IHTMLDocument2, (void**)&spDoc);
spDoc->QueryInterface(IID_IOleCommandTarget, (void**)&spCT);

// ******* THIS IS WHERE IT'S GOING CRAZY!!!! ******* //
spCT->Exec(&CGID_MSHTML, IDM_PRINT, OLECMDEXECOPT_DONTPROMPTUSER, &vPTPath, NULL);

return S_OK;
}

---------------------------------------

STDMETHODIMP CTemplatePrinter::IEPrint(VARIANT varTemplateURL)
{
CComPtr<iolecontainer> spContainer;
CComPtr<iserviceprovider> spSP;
CComPtr<iwebbrowser2> spWB;
CComPtr<idispatch> spDisp;
CComPtr<ihtmldocument2> spDoc;
CComPtr<iolecommandtarget> spCT;
CComVariant vPTPath = varTemplateURL;

m_spClientSite->GetContainer(&spContainer);
spContainer->QueryInterface(IID_IServiceProvider, (void**)&spSP);
spSP->QueryService(SID_SWebBrowserApp, IID_IWebBrowser, (void**)&spWB);
spWB->get_Document(&spDisp);
spDisp->QueryInterface(IID_IHTMLDocument2, (void**)&spDoc);
spDoc->QueryInterface(IID_IOleCommandTarget, (void**)&spCT);

// ***** IT CALLS THIS 2 TIMES? ******** //
spCT->Exec(&CGID_MSHTML, IDM_PRINT, OLECMDEXECOPT_PROMPTUSER, &vPTPath, NULL);

return S_OK;
}
--------------------------

my question is: does anyone have any idea why the IOleCommandTarget::Exec method it going berzerk? when i call the method from a script, the first one keeps spooling pages into the printer, and the second one opens 2 print dialogs in a row...i also have another function for opening a print preview window that works fine....the only difference is my call to Exec is as follows:
spCT->Exec(&CGID_MSHTML, IDM_PRINTPREVIEW, OLECMDEXECOPT_PROMPTUSER, &vPTPath, NULL);

i've tried all that i can see...if i replace spCT->Exec(...) with
spWB->ExecWB(OLECMD_PRINT, OLECMDEXECOPY_PROMPTUSER, &vPTPath, NULL);
it still does the same thing...i've even tryied without passing in the &vPTPath (printing template path) argument

i also know that the method is only getting called once...i tested this by also using spDoc to write some stuff out to pop up a message box every time it got called, and the message box only came up once, but the printing kept going...

any suggestions?
Confused | :confused:

michael griffith
--------------------
mgriffith@lauren.com
mdg12@po.cwru.edu

Safearray with byte data

Anonymous24-Jul-02 4:09

Anonymous

24-Jul-02 4:09

I want to pass byte data from VB into a VC++ COM.

In a setData(VARIANT msgdata), I write the code below, but it has error in pdata[i] = *padata[i]. What's wrong ?

<br />
	if ((msgdata.vt & VT_ARRAY) == 0)<br />
		return E_INVALIDARG;<br />
	if ((msgdata.vt & VT_UI1) == 0)<br />
		return E_INVALIDARG;<br />
<br />
	SAFEARRAY *psa = msgdata.parray;<br />
	PBYTE *padata;<br />
<br />
	SafeArrayAccessData(psa, (void **) &padata);<br />
<br />
	//only one directly, no of element is the data length<br />
	int nsize = psa->rgsabound->cElements;<br />
	PBYTE pdata = new BYTE[nsize];<br />
	for (int i=0; i< nsize; i++)<br />
	{<br />
		pdata[i] = *padata[i];<br />
	}<br />
<br />
	SafeArrayUnaccessData(psa);<br />

In VB, I'm doing some testing code like:

<br />
        Dim ba(2) As Byte<br />
<br />
        ba(0) = 5<br />
        ba(1) = 7<br />
        ba(2) = 19<br />
<br />
        compSSM.setData(ba)<br />

Re: Safearray with byte data

Vi224-Jul-02 4:20

Vi2

24-Jul-02 4:20

I think that you do not need the dereference of pointer. In padata you will have a pointer to some BYTE values after SafeArrayAccessData().

BYTE *padata;
SafeArrayAccessData(psa, (void **) &padata);
//only one directly, no of element is the data length
int nsize = psa->rgsabound->cElements;
PBYTE pdata = new BYTE[nsize];
for (int i=0; i< nsize; i++)
{
pdata[i] = padata[i];
}
or yet
memcpy( pdata, padata, nsize*sizeof(BYTE) );

With best wishes,
Vita

Re: Safearray with byte data

Anonymous24-Jul-02 5:53

Anonymous

24-Jul-02 5:53

Thanks, it's working now. Even I don't have the loop to copy the array. I can use it directly within the block SafeArrayAccessData() and SafeArrayUnaccessData().

Passing COM object as parameter to C++ function

Tomaž Štih24-Jul-02 0:23

Tomaž Štih

24-Jul-02 0:23

I am back to C++ at least for one project and need a quick solution to this problem:
I have a MathLib component, written in ATL, with two COM classes: MathLib.Matrix and MathLib.Vector. For those of you who have no background in math, vector is an array and matrix is 2 dimensional array (i.e. int a[3][3] is a matrix whereas int b[3] is a vector). I only encapsulated functionality to objects because I am going to use these two classes from SQL server and it does not support COM & arrays very well.

Now I would like to perform some quantitative analysis (mathematical operations) on these two classes.
Suppose I have MathLib.Fn COM class. This COM class has function that adds the contents of two arrays and returns array of sums.

For example, I have
[1 2 3] + [4 5 6] = [5 7 9]
(because 1+4=5, 2+5=7, 3+6=9)

My function name is AddVectors, it takes two vector object as input parameters and return vector object as output. This function is in the same C++ dll as the two other ATL classes.

Now I need to know what is the easiest way to declare this function? Don't forget that the Vector and Matrix object will most likely be generated by SQL server transact SQL and only then passed, so I'll be dealing with late binding.

Basically, this is how they'll be used:

SQL SERVER
m=create object mathlib.matrix <--- will probably create IDispatch *
populate m with some values
fn=create object mathlib.fn
n=new matrix
n=fn.execute_some_function(m) <--- will pass object to my COM object

And the second question is how to use these pointers in the function, do I need any marshalling? Anyone has sample of such code?

Kind Regards,
Tomaz

Re: Passing COM object as parameter to C++ function

Vi229-Jul-02 3:12

Vi2

29-Jul-02 3:12

You can provide the such COM class, named as MathLib.Fn, like the MathLib.Matrix and MathLib.Vector. This class must expose the own interface. Let it be a IFn interface with several functions. For example,

HRESULT AddVectors([in] IVector* v1, [in] IVector* v2, [out,retval] IVector* *vsum );
HRESULT AddMatrices([in] IMatrix* m1, [in] IMatrix* m2, [out,retval] IMatrix* *msum ); and so on, as you want.

You could use it on manner, something like
Set n = fn.AddVectors(v1,v2) ' for some Vectors

With best wishes,
Vita

VARIANT and Byte Arrays

Jose Fco Bonnin23-Jul-02 22:26

Jose Fco Bonnin

23-Jul-02 22:26

Hello to everybody.

I'm making a COM object which receive a VARIANT type, I recover this value from database in an ASP page as a Byte Array (it's a bitmap), the COM object must draw something over this bitmap and send again to the ASP page. My problem comes because I need extract the data from the VARIANT in a CLongBinary* but I haven't idea how can I do it.

Can you help me?

Thanks.

Inside COM

CaesarCZ23-Jul-02 12:09

CaesarCZ

23-Jul-02 12:09

Hi,
I've been reading the Inside COM / Microsoft Press book and got to page 20 or so. The whole book so far states, that COM is language-free, vendor-free (combinig vendors), etc etc, everything withh evrything, just keep the standard and then something like

"calling conventions: MS uses __stdcall (in C++) for their component's methods (interface methods, ok) and __cdecl for variable parametr count methods. You don't have to follow it (and as state, with some languages (aka compilators) you don't even have a chance to follow it) but you have been warned that your application will no longer be able to use MS COMPONENTS...

what's that????????

anybody knows how to use OLE without MFC? I'd love a snippet!

Pass a specific C++ object through COM server

chrisl23-Jul-02 3:42

chrisl

23-Jul-02 3:42

Hi,
I'm a beginner in Com and I need help.
I don't manage to get my specific C++ object in my COM client.

I have a C++ DLL that contains this object :
Class CDDSR_MON;
I have a COM server that contains this coclass:

class ATL_NO_VTABLE CoDDSR_CORE
public:
CDDSR_MON * m_pDDSRCORE;
BEGIN_COM_MAP(CoDDSR_Monitoring)
COM_INTERFACE_ENTRY(IDDSR_Monitoring)
COM_INTERFACE_ENTRY(IDispatch)
END_COM_MAP()

I'd like to pass this pointer m_pDDSRCORE to my COM Client so I do that :

In my COM server :
STDMETHODIMP CoDDSR_CORE::getMonitoringInfo(IDDSR_Monitoring **mon){
CDDSR_Mon * ddsrMon;
IDDSR_Monitoring * iddsrMon;
HRESULT hr = ::CoCreateInstance(CLSID_DDSR_Monitoring, NULL,CLSCTX_LOCAL_SERVER,IID_IDDSR_Monitoring, (void**)&iddsrMon);
CComObject<coddsr_monitoring> *pmon;
HRESULT hRes = CComObject<coddsr_monitoring>::CreateInstance(&pmon);
pmon->m_pDDSRMonitoring = ddsrMon;
pmon->QueryInterface(IID_IDDSR_Monitoring, (void**)iddsrMon);
mon = iddsrMon;
return S_OK;
}

In my COM client :

CDDSR_Monitoring* ddsrMonitoring = NULL;
// Now we will intilize COM
hr = CoInitialize(0);

// Use the SUCCEEDED macro and see if we can get a pointer
// to the interface
if(SUCCEEDED(hr))
{
IDDSR_CORE* pDDSR_CORE;
hr = CoCreateInstance( CLSID_DDSR_CORE, NULL, CLSCTX_LOCAL_SERVER,
IID_IDDSR_CORE, (void**) &pDDSR_CORE);
if(SUCCEEDED(hr))
{
IDDSR_Monitoring* iMon;
hr = ::CoCreateInstance(CLSID_DDSR_Monitoring, NULL, CLSCTX_LOCAL_SERVER,IID_IDDSR_Monitoring, (void**) &iMon);
if(FAILED(hr))
pDDSR_CORE->getMonitoringInfo(&iMon);

}

// Uninitialize COM
CoUninitialize();

How to disable script in my Browser Control

rokia22-Jul-02 16:17

rokia

22-Jul-02 16:17

Since Nobody can tell me how to use thumbctl. I have to find another way.

I dont want to popup new window or run any script in my Browser control.

how to do it?

thanks a lot.

<--MFC-->

HELP: Composite Control

minhhoang22-Jul-02 11:59

minhhoang

22-Jul-02 11:59

This is the problem: I have a third party control. I'd like to add more functionalities to the control. So, I created a composite control and drop the third party control onto my newly created composite control. Then I tried to use :

LPUNKNWON pUnknown = GetDlgItem(IDC_THIRD_PARTY_CONTROL_ID);
pUnknown->QueryInterface();

The problem is that GetDlgItem() did not return a CWnd pointer. Therefore, I could call QueryInterface().

Would someone help me?

How do I instantiate the third party control?

msWord automation

pnpfriend22-Jul-02 10:25

pnpfriend

22-Jul-02 10:25

I have two dialog based programs. one is Microsoft Automation. and the other one calls first dialog-based app.
To call first dialog-based app ( let me just say it app2) from first dialog-based app ( app1), I used ShellExecute();

anyway, It is working fine if you compile and execute app1.exe within VC++ 6.0.
if you go to mycomputer-> right click-> window explore->go to app1 folder->debug-> app1.exe, and it is not working anymore.
the error at, which is in app2

<br />
_Application application;<br />
if(!application.CreateDispatch("Word.Application)<br />
{<br />
  AfxMessageBox("Couldn't create Word.Applicaiton");<br />
<br />
}<br />

if I go back to run and execute app1.exe it works again. but not from double clicking on app1.exe in window explore.

I know that's OLE initialization problem where i declare

<br />
if(!AfxOleInit())<br />
{<br />
  AfxMessageBox("Couldn't create OLE COM");<br />
}<br />
<br />

it is in BOOL Capp2App::InitInstance(). From my knownladge, if OLE libs didn't get initialized, I couldn't createDispagech("Word.Application");

How can I initialize OLE Lib evertime i use so i don't have to execute app1.exe inorder to get Word.Application?

Event Sinking Interfaces

QAU22-Jul-02 2:03

QAU

22-Jul-02 2:03

I want to keep all the urls to whome users navigated for this purpose I have to implement the DWebBrowserEvents2 (sinking interface) in my ATL COM based dll but I do not exactly know how to write that dll and to advice internet explorer to call that function on event firing if some one know then tell me or guid me on this problem I will be very much thankful

Event Sinking Interfaces

Anonymous22-Jul-02 2:02

Anonymous

22-Jul-02 2:02

Thumbctl doesnt work.

rokia21-Jul-02 17:18

rokia

21-Jul-02 17:18

Now I want to made a dialog which can preview some image files such as bmp,jpg and so on.

Then I found an ActivexContol named Thumbctl which looks very good. but it dosent work. I cant insert it to my VC++ project. the Error is"unable to open the activex control,make sure the control contains a valid type library", I have tried this in diffrent pc and got the same result.

my system" windows XP, IE 6.0"

I need help. thanks a lot

If I need a new version. where can I find it? OMG | :OMG:

<--MFC-->

Re: Thumbctl doesnt work.

toon21-Jul-02 19:44

toon

21-Jul-02 19:44

Hi.
I too get the same error when I try to insert the ActiveX control. I'm running Windows2000. VC++ 6.0
I have posted a message abt. extracting thumbnails using the Shell's IExtractImage interface. But without success.
Why don't you try it out?
http://www.codeproject.com/script/comments/forums.asp?forumid=1648&select=237898#xx237898xx

Logic is a systematic method of coming to the wrong conclusion with
confidence.

Threaded COM object

Jörgen Sigvardsson21-Jul-02 8:14

Jörgen Sigvardsson

21-Jul-02 8:14

I'm unsure if this is a "correct" solution (COM threading is still a bit mysterious to me):

* I have COM object which needs to live asynchronously from a certain point in time (i.e. after the host has called a "start" method)
* I want it to be able to send events to the host
* I want it to be able to serve the host at any time (i.e., the host should be able to call any method during the COM objects life time)

Is this is viable solution? (Pseudo-code follows)

coclass MyThreadedClass : ISomeInterface, IConnectionPointImpl<...> {
   STDMETHODIMP Start() {
       CreateThread(..., BootStrapFunc, this);
   }

   STDMETHODIMP Stop() {
       // Signal thread to quit and wait for it to finish
   }

private:
   static DWORD WINAPI BootStrapFunc(LPVOID param) {
       MyThreadedClass* pThis = (MyThreadedClass)param;
       pThis->ThreadLoop();
       return 0;
   }

   void ThreadLoop() {
       // Do stuff and generate events until told to quit...
   }
};

If I get this to work, there will be an article about it Smile | :)

FreeBSD is sexy.
<< This space for rent >>

Re: Threaded COM object

Len Holgate21-Jul-02 12:10

Len Holgate

21-Jul-02 12:10

The COM Mailslot object that I develop in this article does that kind of stuff. It has it's own thread and fires async events into VB whilst allowing VB to call into it whenever it likes...

Len Holgate
www.jetbyte.com
The right code, right now.

Re: Threaded COM object

Jörgen Sigvardsson21-Jul-02 12:19

Jörgen Sigvardsson

21-Jul-02 12:19

Thanks for the reply! I'll check out the article right away.. (I can sleep when I die.. Wink | ;)

)

FreeBSD is sexy.
<< This space for rent >>

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