Error while creating object using CreateInstance() - ATL / WTL / STL Discussion Boards

Rahul Vaishnav7-Mar-08 22:45

7-Mar-08 22:45

Hello Friends,

I have developed one ATL com dll for IE tool bar.
My Ie toolbar is having buttons which i have created dynamically.
buttons are having Icon images also.
but i am facing one problem...
I can show only the Icon with "Bit Depth=8" of .ico image.
Actually i want to show Icons with "Bit Depth=32" also.
I am using below code..

UINT colormap = LR_DEFAULTSIZE |LR_LOADMAP3DCOLORS| LR_LOADFROMFILE | LR_CREATEDIBSECTION|LR_LOADTRANSPARENT;

HBITMAP hBitmap =(HBITMAP) ::LoadImage ((HINSTANCE)::GetModuleHandle(NULL),ImagePath,IMAGE_BITMAP,0,0,colormap);

In above code...
while Debugging i came to know that i am getting null in hBitmap variable for Icons with "Bit Depth=32". for Bit Depth up to 24 it is working fine.

Please suggest me the solution....

modified on Monday, March 10, 2008 2:06 AM

Re: Please help me

Dr. Emmett Brown10-Mar-08 10:44

Dr. Emmett Brown

10-Mar-08 10:44

Why are you using IMAGE_BITMAP if you're trying to load icons?
You should try IMAGE_ICON.

Hope it helps

rotter
The metaller programmer

Re: Please help me

Rahul Vaishnav10-Mar-08 18:36

Rahul Vaishnav

10-Mar-08 18:36

Thanks for reply ...

Yes i am now using IMAGE_ICON.
it is workin fine...now I can add Icon with 32 bit Depth in my image list.
I observed one more thing that IMAGE_BITMAP works for icons also...but for icons with Bit Depth upto 24 only.

Thank you...

Problem in getting data from server

MANISH RASTOGI7-Mar-08 18:28

MANISH RASTOGI

7-Mar-08 18:28

Hi Friends,
I am using VC++ 6.0 I careated an exe server using ATL. It has one interface mdethod "ComputerName". Prototype of method is :

[id(1), helpstring("ComputerName")] HRESULT ComputerName([out] short *pnSize, [out, size_is(1, *pnSize)] unsigned char **ppszComputerName);

Server implementation of this function is :

STDMETHODIMP CTestServer::ComputerName(short *pnSize, unsigned char **ppszComputerName)
{
TCHAR szBuffer[100] = {0};
DWORD dwSize = 0;
int iLength = 0;

dwSize = sizeof(szBuffer);

GetComputerName(szBuffer, &dwSize);
iLength = ::lstrlen(szBuffer);

*pnSize = iLength;
*ppszComputerName = (unsigned char *) CoTaskMemAlloc(iLength + 1);
::lstrcpy((char *) *ppszComputerName, szBuffer);

return(S_OK);
}

Client Side Implementation is :

ITestServer *pITestServer = NULL;
HRESULT hResult = NULL;
short int nSize = 0;
unsigned char *pszComputerName = NULL;

CoInitialize(NULL);

hResult = CoCreateInstance(....);
if(SUCCEEDED(hResult))
{
pITestServer->ComputerName(&nSize, &pszComputerName);
// Here is problem only pszComputerName[0] contains valid data. other contains invalid data. nSize contains valid length.
pITestServer->Release();
}

CoUninitialize();

I am unable to get the reason. Anyone can help me please.

Manish Rastogi

Re: Problem in getting data from server

Ernest Laurentin10-Mar-08 4:47

Ernest Laurentin

10-Mar-08 4:47

Hi Manish,
If you want to pass string, use BSTR. COM marshalling works a bit different.
If you plan to transfer 'byte*', use Safearray of byte.

God bless,
Ernest Laurentin

Re: Problem in getting data from server

MANISH RASTOGI11-Mar-08 21:06

MANISH RASTOGI

11-Mar-08 21:06

Thanks Ernest Laurentin
BSTR is working.

Event Map of an ActiveX control

AbbyIndian6-Mar-08 6:58

AbbyIndian

6-Mar-08 6:58

Hi All,

I have an ActiveX control. And the event map is defined in the control's implementation (.CPP) file.
Say the event map has a function

EVENT_CUSTOM("SomeEvent", FireSomeEvent, VTS_BOOL)

defined in it...

Now I can very easily call the function 'FireSomeEvent' from the control's implementation cpp file.
Can I call 'FireSomeEvent' from some other cpp file....means some other's class's code ??

If yes then how??

Urgent help needed...

Thanks and Regards

...A Programmer may or may not be the master of the programming language grammar...

Error while creating object using CreateInstance()

KASR16-Mar-08 0:31

KASR1

6-Mar-08 0:31

//Main.h
__interface IFileIO : IDispatch
{
[id(1), helpstring("method GetFile")] HRESULT GetFile();
[id(2), helpstring("method getDirectory")] HRESULT GetDirectory();
};

class ATL_NO_VTABLE EDCService :public IFileIO
{
public:
EDCService()
{
}
DECLARE_PROTECT_FINAL_CONSTRUCT()
HRESULT FinalConstruct()
{
return S_OK;
}

void FinalRelease()
{
}

public:

STDMETHOD(GetFile);
STDMETHOD(GetDirectory);
}

Hi friends ...

STDMETHOD(GetFile);
STDMETHOD(GetDirectory); these two methods definitions are written main.cpp

i doing so many try's to solve this prob..first i create instance of EDCService.like

EDCService edcobj;

then i create instance of EDCService like

edcobj.CreateInstance(); but showing..

When i compile this code i get the follwing errors i dont know how was solve it

error C2039: 'CreateInstance' : is not a member of 'EDCService'

error C2259: 'EDCService' : cannot instantiate abstract class

Please tell me how to solve this problem ..

Re: Error while creating object using CreateInstance()

Nathan Holt at EMOM6-Mar-08 4:42

Nathan Holt at EMOM

6-Mar-08 4:42

Sakthi_Vel wrote:
then i create instance of EDCService like

edcobj.CreateInstance(); but showing..

When i compile this code i get the follwing errors i dont know how was solve it

error C2039: 'CreateInstance' : is not a member of 'EDCService'

You aren't supposed to create an instance that way. If you are inside your program, you could use CComObject<edcservice>::CreateInstance. To create it from a client, you would normally assign a class ID to EDCService and the use CoCreateInstance.

Sakthi_Vel wrote:
error C2259: 'EDCService' : cannot instantiate abstract class

IDispatch has four pure virtual methods that you can implement by deriving EDCService from IDispatchImpl. IDispatch derives from IUnknown which has three more methods, which are implemented in CComObject. Also you need an interface map for EDCService so that CComObject::QueryInterface can work correctly.

Sakthi_Vel wrote:
//Main.h
__interface IFileIO : IDispatch
{
[id(1), helpstring("method GetFile")] HRESULT GetFile();
[id(2), helpstring("method getDirectory")] HRESULT GetDirectory();
};

This looks like attributed ATL. You really don't want to use it. Attribute support for standard C++ is much weaker than for .net, and I've found that (at least with VS2003) that it has an extreme problem with interface dependancies, because the generated .idl file neither forward declares types, nor attempts to put them in an order which wouldn't need it. To do anything significant with ATL, you'll need to learn IDL.

Nathan

Bug in atlhost.h

imagiro29-Feb-08 0:51

imagiro

29-Feb-08 0:51

I don't know where to report this bug, so may be this is the right place...
If you set an IDocHostUIHandlerDispatch-interface the FilterDataObject-Method of CAxHostWindow does NOT query the IDataObject-interface from the returned IUnknown, instead it calls QueryInterface on it self:

if (m_spIDocHostUIHandlerDispatch != NULL)
{
	CComPtr<iunknown> spUnk;
	hr = m_spIDocHostUIHandlerDispatch->FilterDataObject(pDO, &spUnk);
	if (spUnk)
		hr = QueryInterface(__uuidof(IDataObject), (void**)ppDORet);    // self!!
	if (FAILED(hr) || *ppDORet == NULL)
		hr = S_FALSE;
}
</iunknown>

So the line

hr = QueryInterface(__uuidof(IDataObject), (void**)ppDORet);

should be more like:

hr = spUnk->QueryInterface(__uuidof(IDataObject), (void**)ppDORet);

Does anyone know where to report this bug?

Greetings,
imagiro

Re: Bug in atlhost.h

Michael Dunn29-Feb-08 9:29

Michael Dunn

29-Feb-08 9:29

connect.microsoft.com[^] is the place to report bugs, or post in a MS support forum.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

"That's what's great about doing user interface work. No matter what you do, people will say that what you did was idiotic." -- Raymond Chen

Reporting Bugs

imagiro6-Mar-08 21:57

imagiro

6-Mar-08 21:57

Thanks Mike. Looks like reporting bugs is sometimes harder than finding them Wink | ;)

Getting element id on click event from web browser in ATL

ashish@indianic27-Feb-08 20:28

ashish@indianic

27-Feb-08 20:28

Hi All,

I have developed the project in ATL in which I am getting events from the browser window through Invoke() function of the IDispatch interface.

And my question is that I want to get Mouse Click event with the element id on which event has been fired.How can I do that?

I tried below code to do the same but I m not getting success.

<br />
<br />
STDMETHODIMP CSimpleTab::Invoke(DISPID dispIdMember, REFIID riid, LCID lcid, WORD wFlags,<br />
                                    DISPPARAMS* pDispParams, VARIANT* pVarResult,<br />
                                    EXCEPINFO* pExcepInfo, UINT* puArgErr)<br />
{<br />
      switch (dispIdMember)<br />
      {<br />
          case DISPID_HTMLELEMENTEVENTS2_ONMOUSEDOWN:<br />
          {<br />
              CComVariant dis_event;<br />
			  dis_event = (CSimpleTab *)(this);<br />
			  <br />
			  IDispatch *lpDispatch = pVarResult->pdispVal;<br />
			  IHTMLEventObj * eventObj;<br />
			  HRESULT hr = lpDispatch->QueryInterface(IID_IHTMLEventObj,(void **)&eventObj);<br />
<br />
			  IHTMLElement * element;<br />
			  eventObj->get_srcElement(&element);<br />
          }<br />
      }<br />
}<br />

in above code I m getting null in to the pVarResult->pdispVal parameter.
Do you have any idea why does this happen?
Thanks in Advance.

Ashish Bhatt,
Indianic,Ahmedabad.

How to use messagebox in ATL

KASR126-Feb-08 21:41

KASR1

26-Feb-08 21:41

I am new to ATL. How to display a message box in ATL projects?

Re: How to use messagebox in ATL

ThatsAlok26-Feb-08 21:59

ThatsAlok

26-Feb-08 21:59

Sakthi_Vel wrote:
I am new to ATL. How to display a message box in ATL projects?

::MessageBox(NULL,_T(""),_T(""),MB_OK); same like any win32 project

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
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Re: How to use messagebox in ATL

prasad_som5-Mar-08 4:57

prasad_som

5-Mar-08 4:57