C / C++ / MFC

Re: How to read and manipulate xml files in vc++ 05?

26-Mar-08 1:37

Google & CodeProject search engines are you best friends, for instance see
http://www.codeproject.com/KB/XML/ce_xml.aspx[^]
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

Saurabh.Garg26-Mar-08 1:48

Saurabh.Garg

26-Mar-08 1:48

I would recommend TinyXml[^]. I have been using it for a while and find it easy to use.

-Saurabh

Why TranslateAccelerator fails only in release mode ?

sdancer7526-Mar-08 1:14

sdancer75

26-Mar-08 1:14

Hi I am using the following PreTranslateMessage and it works just fine in debug mode but the ::TranslateAccelerator fails in release. What seems to be worng here ?

BOOL CLeftTabSheet1::PreTranslateMessage(MSG* pMsg) <br />
{<br />
	// TODO: Add your specialized code here and/or call the base class<br />
	if (pMsg->message == WM_KEYDOWN && ((CMainFrame *)AfxGetMainWnd())!=NULL)<br />
	{<br />
		<br />
		int nVirtKey = (int) pMsg->wParam;<br />
		CString str;<br />
		str.Format("%d",nVirtKey);<br />
		AfxMessageBox("In - PreTranslate VirtKey=" + str);<br />
		if (::TranslateAccelerator( ((CMainFrame *)AfxGetMainWnd())->m_hWnd,((CMainFrame *)AfxGetMainWnd())->m_hAccelTable,pMsg))<br />
		{<br />
			<br />
			AfxMessageBox("Out - PreTranslate");<br />
			return TRUE;<br />
<br />
		}<br />
	}<br />
	<br />
	<br />
	return CPropertyPage::PreTranslateMessage(pMsg);<br />
}

sdancer75

Re: Why TranslateAccelerator fails only in release mode ?

CPallini26-Mar-08 1:24

Re: Why TranslateAccelerator fails only in release mode ?

26-Mar-08 1:24

Do you know about GetLastError function?

sdancer7527-Mar-08 22:10

sdancer75

27-Mar-08 22:10

Yes I know. In release mode i get "invalid acceleration table". Its strange because i use the default acceleration table IDR_MAINFRAME that doc/view wizard creates. This works just fine in the debug mode but in release mode, the member m_hAccelTable is Null.

Anyway i didn't find any solution for that, so I created a new acceleration table and I loaded manually. In this way it works but I was curious for the problem I described above.

Regards,
George

sdancer75

PostMessage to a different thread's messageQueue

snir_ya26-Mar-08 1:04

Re: PostMessage to a different thread's messageQueue

26-Mar-08 1:04

Hi,

In my win32 application i open a working thread using _beginThread(...). This thread preforms a certain work and when it's done it has to notify the main application thread. I'm implementing this by having the working thread to post a message (that will be processed by the main thread) and commit suicide (_endthread()).

For some reason the posted messages of the working thread are not received in the other threads message proc.
Does anyone have an idea?

Thanks in advance.
Snir Yarom.

CPallini26-Mar-08 1:18

Re: PostMessage to a different thread's messageQueue

26-Mar-08 1:18

Maybe posting the relevant code will help.
BTW why doesn't the worker thread just return?

snir_ya26-Mar-08 1:37

Re: PostMessage to a different thread's messageQueue

26-Mar-08 1:37

Here's the relevant code:

void RunAuthenticate(LPVOID pThreadId); //decleration<br />
<br />
void MyClass::Authenticate(std::string userName, std::string password, int *balance, HWND hwnd)<br />
{<br />
    //working thread initialization<br />
    m_threadNum++; <br />
    HANDLE hThrd = (HANDLE)_beginthread(RunAuthenticate, 0, &m_threadNum);<br />
}<br />
//Global function<br />
void RunAuthenticate(LPVOID pThreadId)<br />
{<br />
    HWND hwnd = CComManager::GetInstance()->GetCallingWnd(pThreadId); //return the calling window hwnd<br />
    long proc;<br />
    DWORD hThread = ::GetWindowThreadProcessId(hwnd,(LPDWORD)&proc);<br />
    if(hThread != NULL)<br />
        ::PostThreadMessage((DWORD) hThread,(UINT)THREAD_FINISHED, (WPARAM)status, NULL);<br />
}

Thanks.

snir_ya26-Mar-08 1:43

Re: PostMessage to a different thread's messageQueue

26-Mar-08 1:43

More Clarifications:

The calling thread returns right after initializing the working thread.
The working thread should notify the main thread asynchly when his job was done.
The notification message (::PostThreadMessage(...)) isn't caught in the main thread message proc.

Thanks again.

Snir_ya

CPallini26-Mar-08 2:53

Re: PostMessage to a different thread's messageQueue

26-Mar-08 2:53

What is CComManager (is your?)?
Why don't you simply pass the Main Window handle to the working thread so that the latter can post a message to?

snir_ya26-Mar-08 3:24

Re: PostMessage to a different thread's messageQueue

26-Mar-08 3:24

Thanks for your reply.

1.
Yes, CComManager is mine. In my code it returns the HWND of the (login) dialog that called the working thread.
The (login) dialog was intialized by the main thread. The working thread needs to post a message to this dialog. But all the messages sent by the working thread are lost.

2.
It's a win32 application. How do i get the Main window handle?

Thanks again for your help.

Snir_ya.

CPallini26-Mar-08 4:08

Re: PostMessage to a different thread's messageQueue

26-Mar-08 4:08

Post the message to the main window.

When you create the main window (i.e.e inside InitInstance in the wizard-generated code), you have the great opportunity to store its handle for later use.

Smile | :)

rp_suman26-Mar-08 4:56

rp_suman

26-Mar-08 4:56

If you use CreateWindow(), it will return window handle.

Check this page: Creating Win32 Applications[^]

See the point 3.

Best Regards,
Suman

Drawing text with DirectDraw

Hanan88826-Mar-08 0:43

26-Mar-08 0:43

I'm developing an animated game.
It's a Win32 app, written in C++.
For various reasons, I'm porting it to use DirectDraw interfaces.

I can't find a simple way to draw text.

I saw examples of people blitting images of text, for example to draw "Hey" they draw image of 'H' then image of 'e'...

I might draw with Windows GDI but that AFAIK this is drawing to 'windows'/'controls'/HWND , which will make the code some crazy mess.

Where's the easy way ?

James R. Twine26-Mar-08 1:45

James R. Twine

26-Mar-08 1:45

   I believe you are either going to have to use letter-bitmaps as you mention above, or resort to using GUI to draw on the DirectDraw surface. I did this a long time ago, and I am not even sure if recent versions of DirectX still support the ability to have GDI/GDI+ draw on a DD surface...

   Creating a function that takes a source bitmap (of letters/numbers/symbols), a string, and a origin is not really that hard, and may work faster than you think. It might be faster than going back and forth between DX/GDI in the long run...

   Peace!

-=- James
Please rate this message - let me know if I helped or not!<hr></hr>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!
Remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles

Hanan88826-Mar-08 1:51

26-Mar-08 1:51

Thanks.

Hanan88826-Mar-08 3:11

26-Mar-08 3:11

I managed to mix the DirectDraw and Windows GDI like this:

HDC hdc = NULL;
HRESULT result = m_lpDDSBack->GetDC(&hdc);  //m_lpDDSBack is my backbuffer surface
    wchar_t text[256] = "thank god";
    int x = 100;
    int y = 200;

    size_t length = wcslen(text);
CPTDDUtils::MyDrawText(hdc, x, y, text, length);

m_lpDDSBack->ReleaseDC(hdc);

void  CPTDDUtils::MyDrawText(HDC hdc, int x, int y, LPCTSTR lpString, int stringSize)
{
	/*HFONT*/ HGDIOBJ  hFont, hOldFont; 

	// Retrieve a handle to the variable stock font. 
	hFont = GetStockObject(ANSI_VAR_FONT); 

	// Select the variable stock font into the specified device context.
	if (hOldFont = SelectObject(hdc, hFont)) 
	{ 
		TextOut(hdc, x, y,lpString , stringSize); 

		// Restore the original font.	
		SelectObject(hdc, hOldFont); 
	}
}

I do this after I drew the bitmaps, and before I 'flip' .

So this draws the text but in white rectangle. I don't want the white rectangle, I want this rectangle to be transparent. Also, I rather use some normal font.

Also, if this code is 'messed up', please let me know. Smile | :)

James R. Twine26-Mar-08 4:58

James R. Twine

26-Mar-08 4:58

Look up the SetBkMode(...) function for setting up Transparency. Also look up the ExtTextOut(...) function, as I bet you will be moving to it soon! Smile | :)

   You can specify your own font to use by using the CreateFont(...) and CreateFontIndirect(...) functions. Better to create the font once and reuse it.

   If you want something like a multicolor font, you will need to draw the bitmaps for it yourself.

   Peace!

Hanan88826-Mar-08 5:39

26-Mar-08 5:39

Thanks a lot. Big Grin | :-D

Stephen Hewitt26-Mar-08 13:54

Stephen Hewitt

26-Mar-08 13:54

Hanan888 wrote:
wchar_t wchar_t text[256] = "thank god";

Why the 256? Use this instead:

wchar_t text[] = "thank god";

Why waste 492 bytes?

Hanan888 wrote:
size_t length = wcslen(text);

If the above change is made this runtime call call be changed to a compile time calculation as follows:

size_t length = sizeof(text)/sizeof(text[0]) - 1;

Steve

Hanan88826-Mar-08 22:39