How to solve error: Heap block at 007A8530 modified at 007A860A past requested size of d2?

madharasan1 asked:

I am a newbie to C++. I was trying to convert the function here to set html unicode text to clipboard. This is what I have done so far:

C++

bool CopyHTML2(WCHAR *html ){
    wchar_t *buf = new wchar_t [400 + wcslen(html)];
    if(!buf) return false;

	static int cfid = 0;
    if(!cfid) cfid = RegisterClipboardFormat("HTML Format");

	    // Create a template string for the HTML header...
    wcscpy(buf,
        L"Version:0.9\r\n"
        L"StartHTML:00000000\r\n"
        L"EndHTML:00000000\r\n"
        L"StartFragment:00000000\r\n"
        L"EndFragment:00000000\r\n"
        L"<html><body>\r\n"
        L"<!--StartFragment -->\r\n");

    // Append the HTML...
    wcscat (buf, html);
    wcscat (buf, L"\r\n");
    // Finish up the HTML format...
    wcscat (buf,
        L"<!--EndFragment-->\r\n"
        L"</body>\r\n"
        L"</html>");

	wchar_t *ptr = wcsstr(buf, L"StartHTML");
	wsprintfW(ptr+10, L"%08u", wcsstr(buf, L"<html>") - buf);
	*(ptr+10+8) = L'\r';

    ptr = wcsstr(buf, L"EndHTML");
    wsprintfW(ptr+8, L"%08u", wcslen(buf));
    *(ptr+8+8) = '\r';

    ptr = wcsstr(buf, L"StartFragment");
    wsprintfW(ptr+14, L"%08u", wcsstr(buf, L"<!--StartFrag") - buf);
    *(ptr+14+8) = '\r';

    ptr = wcsstr(buf, L"EndFragment");
    wsprintfW(ptr+12, L"%08u", wcsstr(buf, L"<!--EndFrag") - buf);
    *(ptr+12+8) = '\r';

	// Open the clipboard...
    if(OpenClipboard(0)) {
        EmptyClipboard();
        HGLOBAL hText = GlobalAlloc(GMEM_MOVEABLE |GMEM_DDESHARE, wcslen(buf)+4);
        wchar_t *ptr = (wchar_t *)GlobalLock(hText);
        wcscpy(ptr, buf);
        GlobalUnlock(hText);
        SetClipboardData(cfid, hText);
        CloseClipboard();
        GlobalFree(hText);
    }

    // Clean up...
    //delete [] buf;
	return true;
}

I get the following error at SetClipboardData function:

HEAP[Project1.exe]: Heap block at 00378038 modified at 0037813E past requested size of fe
Project1.exe has triggered a breakpoint.

Any idea on how to solve this? Also is it the right way to do this? Or is there a simpler way to do it?

Thanks in advance for all your help.

Tags: C++, VC++

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