Thread: IHTMLDocument2 get_body error

Hi all, I have this code:

Code:

void OnGetDocInterface(HWND hWnd) 
{
	CoInitialize( NULL );

	// Explicitly load MSAA so we know if it's installed
	HINSTANCE hInst = ::LoadLibrary( _T("OLEACC.DLL") );
	if ( hInst != NULL )
	{
		if ( hWnd != NULL )
		{
			HWND hWndChild=NULL;
			// Get 1st document window
			hWndChild = FindIEWindow()
			if ( hWndChild )
//hWndChild contains a valid "Internet Explorer_Server" handle
			{
				CComPtr<IHTMLDocument2> spDoc;
				LRESULT lRes;
			
				UINT nMsg = ::RegisterWindowMessage( _T("WM_HTML_GETOBJECT") );
				::SendMessageTimeout( hWndChild, nMsg, 0L, 0L, SMTO_ABORTIFHUNG, 1000, (DWORD*)&lRes );

				LPFNOBJECTFROMLRESULT pfObjectFromLresult = (LPFNOBJECTFROMLRESULT)::GetProcAddress( hInst, (char *)("ObjectFromLresult") );
				if ( pfObjectFromLresult != NULL )
				{
					HRESULT hr;
					hr = (*pfObjectFromLresult)( lRes, IID_IHTMLDocument, 0, (void**)&spDoc );
					if ( SUCCEEDED(hr) )
					{
						// Change background color to red
						spDoc->put_bgColor( CComVariant(L"red") );//this is were the program crashes*
					}
				}
			} // else document not ready
		} // else Internet Explorer is not running
		::FreeLibrary( hInst );
	} // else Active Accessibility is not installed
	CoUninitialize();
}

-----------------
When execution gets to:
spDoc->put_bgColor( CComVariant(L"red") );
I get error:
"Unhandled exception at 0xabababab in TestApp.exe: 0xC0000005: Access violation reading location 0xabababab."
and my program crashes.
----------------------
The handle is corect and there is no error until that point.
The code is from http://support.microsoft.com/kb/249232 so it is probably corect.
I use VC++ 2008 Express Edition, I have included:
#include <Windows.h>
#include <Mshtml.h>
#include <OleAcc.h>
#include <atlbase.h>
----------------
Thx in advance .

I am going to pull a Salem move on this one.

http://www.codeguru.com/forum/showth...hreadid=458950

Humor aside, I am of the impression you should have

Code:

spDoc->put_bgColor(CComBSTR(L"red") );

instead of:

Code:

spDoc->put_bgColor( CComVariant(L"red") );

But since I never use ATL, I have no freaking clue. I just used google and copied and pasted from pages without reading them.

I do have the same problem, any one would help me please?

Environment:

VS2008 C++, ATL

Exception:

Code:

Unhandled exception at 0xabababab in GetIHtmlElementSample1.exe: 0xC0000005: Access violation reading location 0xabababab.

Code:

BSTR ur;
// if( spDoc->get_URL( &ur ) )
//	 ShowMessage( ur );

// Change background color to red
spDoc->put_bgColor( CComVariant("red") );
// spDoc->put_bgColor( CComBSTR(L"red") );

ShowMessage( _T("Congraturations to you, you have change the background color to red."));

Code:

	// Change background color to red
							spDoc->put_bgColor( CComVariant("red") );
00415B40  push        offset string "red" (4296F0h) 
00415B45  lea         ecx,[ebp-15Ch] 
00415B4B  call        ATL::CComVariant::CComVariant (4112BCh) 
00415B50  mov         dword ptr [ebp-17Ch],eax 
00415B56  mov         eax,dword ptr [ebp-17Ch] 
00415B5C  mov         dword ptr [ebp-180h],eax 
00415B62  mov         byte ptr [ebp-4],1 
00415B66  mov         ecx,dword ptr [ebp-180h] 
00415B6C  mov         edx,dword ptr [ecx] 
00415B6E  mov         dword ptr [ebp-174h],edx 
00415B74  mov         eax,dword ptr [ecx+4] 
00415B77  mov         dword ptr [ebp-170h],eax 
00415B7D  mov         edx,dword ptr [ecx+8] 
00415B80  mov         dword ptr [ebp-16Ch],edx 
00415B86  mov         eax,dword ptr [ecx+0Ch] 
00415B89  mov         dword ptr [ebp-168h],eax 
00415B8F  lea         ecx,[spDoc] 
00415B92  call        ATL::CComPtrBase<IHTMLDocument2>::operator-> (411663h) 
00415B97  mov         dword ptr [ebp-184h],eax 
00415B9D  mov         esi,esp 
00415B9F  sub         esp,10h 
00415BA2  mov         ecx,esp 
00415BA4  mov         edx,dword ptr [ebp-174h] 
00415BAA  mov         dword ptr [ecx],edx 
00415BAC  mov         eax,dword ptr [ebp-170h] 
00415BB2  mov         dword ptr [ecx+4],eax 
00415BB5  mov         edx,dword ptr [ebp-16Ch] 
00415BBB  mov         dword ptr [ecx+8],edx 
00415BBE  mov         eax,dword ptr [ebp-168h] 
00415BC4  mov         dword ptr [ecx+0Ch],eax 
00415BC7  mov         ecx,dword ptr [ebp-184h] 
00415BCD  push        ecx  
00415BCE  mov         edx,dword ptr [ebp-184h] 
00415BD4  mov         eax,dword ptr [edx] 
00415BD6  mov         ecx,dword ptr [eax+70h] 
00415BD9  call        ecx  
00415BDB  cmp         esi,esp 
00415BDD  call        @ILT+1880(__RTC_CheckEsp) (41175Dh) 
00415BE2  mov         byte ptr [ebp-4],0 
00415BE6  lea         ecx,[ebp-15Ch] 
00415BEC  call        ATL::CComVariant::~CComVariant (411177h) 
							// spDoc->put_bgColor( CComBSTR(L"red") );

							ShowMessage( _T("Congraturations to you, you have change the background color to red."));
00415BF1  push        offset string L"Congraturations to y"... (429648h) 
00415BF6  call        ShowMessage (411348h) 
00415BFB  add         esp,4

The code in the article has a typo

hr = (*pfObjectFromLresult)( lRes, IID_IHTMLDocument, 0, (void**)&spDoc );

should be

hr = (*pfObjectFromLresult)( lRes, IID_IHTMLDocument2, 0, (void**)&spDoc );