C / C++ / MFC

VC ++ desktop service based on SOAP

15-Mar-05 5:55

What's it for (i.e., what needs it)?

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

ashutosh_tripathi15-Mar-05 3:15

ashutosh_tripathi

15-Mar-05 3:15

hello to all members

i am making vc++ desktop service application. this application communicate with clients on the port 3310.

i want to exchange data through SOAP objects. how can my service read and

reponse to client using SOAP.

i am new in vc++ services so i don't know how to handle this type of programming. please help me to sortout my problem.

ur suggestions are required.

thanks in advance.

Ashutosh Tripathi

CDHtmlDialog problem

ewanb15-Mar-05 2:34

ewanb

15-Mar-05 2:34

Hi,

I have a CDHtmlDialog derived class that is causing me a problem. Every 3rd time I create an instance and call DoModal() I get an access violation occuring inside the CDHtmlDialog::OnInitDialog method and it is being caused by the m_wndBrowser member being NULL.

The problem occurs in this part of the method:

if (m_pBrowserApp == NULL)<br />
{<br />
	// create the control window<br />
	m_wndBrowser.CreateControl(CLSID_WebBrowser, NULL, WS_VISIBLE | WS_CHILD,<br />
					rectClient, this, AFX_IDC_BROWSER);<br />
	lpUnk = m_wndBrowser.GetControlUnknown();<br />
	if (FAILED(lpUnk->QueryInterface(IID_IWebBrowser2, (void**) &m_pBrowserApp)))<br />
	{<br />
		m_wndBrowser.DestroyWindow();<br />
		DestroyWindow();<br />
		return TRUE;<br />
	}<br />
}

The call to m_wndBrowser.CreateControl() fails causing the m_wndBrowser to be set to NULL.

I tried reusing one instance of my class and repeatedly calling DoModal() on the same object and the same thing happened. Can anyone suggest what might cause the create call to fail after two previous successful calls?

All help appreciated because this has been bugging me for a while now.
Thanks,
Ewan

Blake Miller15-Mar-05 12:51

Blake Miller

15-Mar-05 12:51

Are you calling the base class OnInitDialog() before trying to use the m_wndBrowser ?
Also, I assume that the m_pBrowserApp variable is set back to NULL at appropriate times, so that your tests are valid.

ewanb16-Mar-05 2:05

ewanb

16-Mar-05 2:05

The code I showed was from the base class implementation not from my code. I only included it to illustrate where the problem was occurring. I'm not touching any of the members of the CDHtmlDialog class. That's why I'm confused by what is happening because none of my code does anything other than call CDHtmlDialog::OnInitDialog().

Blake Miller16-Mar-05 11:35

Blake Miller

16-Mar-05 11:35

This seems a bit strange.
If your code is encapsulated enough, can you post the example of where/how you create the dialog instance and where you call DoModal() and anything you do to the dialog class instance between creating the instance and calling DoModal()?

It seems like sometimes either the browser widnow is not crated or the browser pointer is not null. Can you look into why that might be the case? It seems strange to me that the base class code does not verify that the create window call succeeds prior to trying to create the com interface.

COM Events: reference values

Ed K6-Sep-05 10:28

Ed K

6-Sep-05 10:28

Did you ever figure out what was going on? I'm having the same issue...or very close..

ed

~"Watch your thoughts; they become your words. Watch your words they become your actions.
Watch your actions; they become your habits. Watch your habits; they become your character.
Watch your character; it becomes your destiny."
-Frank Outlaw.

Direct X & DVD

AJ12315-Mar-05 2:23

AJ123

15-Mar-05 2:23

Just been taking a quick look over the SDK for DirectX and see that it has support for DVDs. Does anyone know whethere its possible to use the API to grab images from a DVD?

Cheers

peterchen15-Mar-05 1:48

peterchen

15-Mar-05 1:48

Hi,
I'm trying to fire an even from an C++ ActiveX that has a "by reference" parameter:

dispinterface _IMyEvents
[id(4)] void ButtonClicked(IMyProperty * prop, [in, out, ref] VARIANT_BOOL * bDataChanged);

However, the Fire_Event proxy code generated by the wizard complains about the byref value:

pvars[0] = bDataChanged;  // pvars[0] is a CComVariant

it's just a warning (short * truncated to bool), but it clearly indicates it doesn#t work as intended (CComVariant does not support reference values).

So - anything I can do?
The only alternatives I see are:
- write the fire_xxx wrapper myself (yuck!!!)
- provide a COM object with a "SetModified" flag instead (seems overkill)
- hack CComVariant into accepting a VARIANT_BOOL * as BYREF value (yuck yuck)

(The mechanism I need is similar to IPropertyNotifySink, but I want to support VB clients, so I can't work with S_OK / S_FALSE return value)

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BSTR TO STRING

sunit515-Mar-05 1:45

sunit5

15-Mar-05 1:45

ALOK
I WANT TO CONVERT BACK A BSTR FILE TO A STRING FILE. IS IT POSSIBLE to CONVERT BSTR TO WIDE CHARACTER AND THEN (USING WideCharToMultiByte )TO CHARACTER

ThatsAlok15-Mar-05 2:14

ThatsAlok

15-Mar-05 2:14

There are many ways to convert BSTR TO STRING , here i am mentioning TWO!

1.wcstombs(...)
2.using String Conversion Macro LIKE W2T,T2BSTR....., but you have to enable String Conversion Macro by using USES_CONVERSION; macro

yeah you can use
WideCharToMultiByte, but this api always confuse me lot! Big Grin | :-D

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Alok Gupta
visit me at http://www.thisisalok.tk

"I ~~Think~~ Believe this Will Help"

sunit515-Mar-05 2:41

sunit5

15-Mar-05 2:41

BSTR AND WIDECHARACETR(UNICODE) R SAME.

ThatsAlok15-Mar-05 2:59

ThatsAlok

15-Mar-05 2:59

Buddy!
BSTR and Wide Character has almost same format for character representation. so you can use wcstombs or string conversion macro stated above!! to convert them from wide character to multibyte character string, just try!!!

or if you are using MFC , CString expose some function for BSTR tooo,like CString::SetSysString , CString::AllocSysString

[Vote One Here, Complete my Survey....]

Alok Gupta
visit me at http://www.thisisalok.tk

"I ~~Think~~ Believe this Will Help"

Ravi Bhavnani15-Mar-05 3:34

Ravi Bhavnani

15-Mar-05 3:34

Please don't shout! My ears hurt. Smile | :)

/ravi

My new year's resolution: 2048 x 1536
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Problem in Copying a data / image to a ClipBoard

includeh1015-Mar-05 8:25

includeh10

15-Mar-05 8:25

BSTR is just a WORD string (16 bits for each value).
if the BSTR contains 0 (zero), you can not convert it to CString because CString can not contain zero.

if not, do this way:
//assume length of BSTR is iNum
//cs is CString, bstr is BSTR
for(i=0;i<iNum;i++)
{
cs+=(char)bstr[i];
}

very easy

includeh10

zahid_ash15-Mar-05 1:44

zahid_ash

15-Mar-05 1:44

I am using the Following code :
When i call it first time to copy data , then i paste it in any MS word or Excel it works , On Second time when i copy the data the Program Crashes At the statment :
/////pData->SetClipboard();

CopyData()
{
CDC* dcRef = GetDC();

tagSTGMEDIUM * data;
data = new tagSTGMEDIUM;

CMetaFileDC * dcMeta;
dcMeta = new CMetaFileDC();
if(!dcMeta)
{
AfxMessageBox("Unable to Load data on Clipboard");
return;
}

COleDataSource* pData = new COleDataSource;

//replace "ImageName" with a description of this image
dcMeta->CreateEnhanced(dcRef, NULL, NULL,"Cca-Graph" );
dcMeta->SetMapMode(MM_TEXT);

dcMeta->SetAttribDC(dcRef->m_hAttribDC);

//actually draw to the device context
CRect rcWnd;
GetClientRect(&rcWnd);
//draw meta file :: do what ever you want to do: bitmaps, lines, text...
DrawChart(dcMeta, rcWnd, false);
//done drawing

data->tymed = TYMED_ENHMF;
data->hEnhMetaFile = dcMeta->CloseEnhanced();

pData->CacheData( CF_ENHMETAFILE, data );

////////////// Crashes Here when called Second time //////////////////////
pData->SetClipboard();

// Release the meta file attributes
dcMeta->ReleaseAttribDC();

delete dcMeta;
delete data;
}

Regards.

Re: Problem in Copying a data / image to a ClipBoard

David Crow15-Mar-05 2:33

Re: Problem in Copying a data / image to a ClipBoard

15-Mar-05 2:33

So have you stepped into the SetClipboard() call to see why it is crashing?

zahid_ash wrote:
COleDataSource* pData = new COleDataSource;

Where is the corresponding delete?

I don't see much error checking. Are all calls to new successful?

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

zahid_ash15-Mar-05 2:49

zahid_ash

15-Mar-05 2:49

It is showing Access Violation in OLE32.DLL

What the problm is it ?

thanx

Regards.

Re: Problem in Copying a data / image to a ClipBoard

David Crow15-Mar-05 2:58

Re: Problem in Copying a data / image to a ClipBoard

15-Mar-05 2:58

zahid_ash wrote:
It is showing Access Violation in OLE32.DLL

Are you saying that it crashes before going into the SetClipboard() method, or that it crashes while inside it?

zahid_ash wrote:
What the problm is it ?

At this point it could be any number of things. Not enough information is known yet.

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

zahid_ash15-Mar-05 3:06

zahid_ash

15-Mar-05 3:06

It Crashes While going in side the SetClipboard() ;

thanx

Regards.

Re: Problem in Copying a data / image to a ClipBoard

David Crow15-Mar-05 3:29