Copying Unicode Text Into Clipboard

hi jkr,

I made changes as you suggested, but it is still the same. Same user break point exception at Setclipboard(...) saying that heap has been corrupted.

Error is as follows:

---
Windows has triggered a breakpoint in <exe>.exe

This may be due a corruption of the heap, which indicates a bug in <exe>.exe or any of the DLLs it has loaded.

This may also be due to the user pressing F12 while <exe>.exe has focus.

The output window has more diagnostic information.
---

The Output window in VS2008 has the following additional information:

HEAP[AI_Talapatra.exe]: Invalid address specified to RtlFreeHeap( 001A0000, 001D9B10 )
Windows has triggered a breakpoint in AI_Talapatra.exe.

Now, the code is as below. First exception is raised at Setclipboard(...), I clicked 'Continue' and then it showed exception at the lines below it continuously: GlobalUnlock(...) and GlobalFree(...), I clicked 'Continute' even at this stage, and the program did not crash, as it was before.

void PredListViewer::OnLbnSelchangeList()
{
	CString listData;
	m_listBox.GetText(m_listBox.GetCurSel(), listData);
 
	if(OpenClipboard())
	{
		HGLOBAL clipbuffer;
		EmptyClipboard();
		clipbuffer = GlobalAlloc(GMEM_MOVEABLE, listData.GetLength()+1*sizeof(wchar_t));
		wchar_t *buffer = (wchar_t *)GlobalLock(clipbuffer);
		wcscpy(buffer, listData.GetBuffer());
		SetClipboardData(CF_UNICODETEXT, clipbuffer);
		GlobalUnlock(clipbuffer);
		GlobalFree(clipbuffer);
		CloseClipboard();	
 
		::SendMessage(GetForegroundWindow()->GetSafeHwnd(), WM_PASTE, 0, 0);
	}
 
}

                                              

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Does listData.GetLength() return the length of the string in characters?  If so, then you probably should use '(listData.GetLength() + 1) * sizeof(wchar_t)' in your call to GlobalAlloc.

Is it a math problem (line 5)? Multiplication comes before addition:

listData.GetLength()+1*sizeof(wchar_t)

ends up being:

listData.GetLength() + 2

Should line 5 above not be:

clipbuffer = GlobalAlloc(GMEM_MOVEABLE, (listData.GetLength() + 1) *sizeof(wchar_t));

Ah, I see - you are allocating the wrong size:

clipbuffer = GlobalAlloc(GMEM_MOVEABLE,listData.GetLength()+1*sizeof(wchar_t));

clipbuffer = GlobalAlloc(GMEM_MOVEABLE,listData.GetLength()+1*sizeof(wchar_t));
 
// should be
 
clipbuffer = GlobalAlloc(GMEM_MOVEABLE,listData.(GetLength()+1)*sizeof(wchar_t));
 
// brackets were missing!
                                              

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Now there is no runtime error, code is working fine and I can see text in clipboard. But the 'paste' functionality is not working!

I cant see text copied into current active window.

For example I am typing something in Notepad, and this application of mine, displays a list of items to select (unicode text strings). When one of them is selected I want them to be pasted in Notepad (or any other window in which I am typing).

Any clue why this sendmessage is not working!

::SendMessage(GetForegroundWindow()->GetSafeHwnd(), WM_PASTE, 0, 0);
 
//doesn't give any result

                                              

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WM_PASTE is documented to work with edit controls and combo boxes.  There is no reason to believe that it will work with an arbitrary window.   You could try simulating the key presses Ctl+v while the focus is in the window in question.

How to simulate Ctl+V

The code below doesn't give any result.

::SendMessage(GetForegroundWindow()->GetSafeHwnd(), WM_KEYDOWN, VK_CONTROL + 'v', 0);

                                              

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I tried the below, but with no use! Any more clues please!

m_curHwnd below is the return value of GetFocus()->GetSafeHwnd()

::PostMessage(m_curHwnd, WM_KEYDOWN, VK_CONTROL, 0);
::PostMessage(m_curHwnd, WM_KEYDOWN, 67, 0);  //

                                              

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HI JohnGaby

Thanks for code. It works with all windows Except MSWORD and thats the main window that I want text to be pasted.

The code can paste text into all types of windows. But for some reason it is not working with MSWord. In the code above, the value of hEdit is return value of GetForegroundWindow()->GetSafeHwnd()

Any clue why it is not working only with MS Word?