C / C++ / MFC

    __declspec(dllexport) LRESULT CALLBACK HookFunction(<br />
                       int code,<br />
                       WPARAM wParam,<br />
                       LPARAM lParam)<br />
      {<br />
         char szVCode[50];<br />
<br />
         //get virtual key code and display it<br />
         sprintf(szVCode, "Virtual Key code: %lx", wParam);<br />
         MessageBox(NULL, szVCode,"Key stroke", MB_OK);<br />
      }

hHookDll = LoadLibrary("hook");<br />
      hHookProc = (HOOKPROC) GetProcAddress(hHookDll, "HookFunction");<br />
<br />
      hSystemHook =  SetWindowsHookEx(WH_KEYBOARD,hHookProc,hHookDll,0); 

UnhookWindowsHookEx(hSystemHook);<br />
      FreeLibrary(hHookDll); 

str.Format("%g",d);

void ChangeDialogFont(CWnd* pWnd, CFont* pFont, int nFlag)<br />
{<br />
	CRect windowRect;<br />
<br />
	// grab old and new text metrics<br />
	TEXTMETRIC tmOld, tmNew;<br />
	CDC * pDC = pWnd->GetDC();<br />
	CFont * pSavedFont = pDC->SelectObject(pWnd->GetFont());<br />
	pDC->GetTextMetrics(&tmOld);<br />
	pDC->SelectObject(pFont);<br />
	pDC->GetTextMetrics(&tmNew);<br />
	pDC->SelectObject(pSavedFont);<br />
	pWnd->ReleaseDC(pDC);<br />
<br />
	long oldHeight = tmOld.tmHeight+tmOld.tmExternalLeading;<br />
	long newHeight = tmNew.tmHeight+tmNew.tmExternalLeading;<br />
<br />
	if (nFlag != CDF_NONE)<br />
	{<br />
		// calculate new dialog window rectangle<br />
		CRect clientRect, newClientRect, newWindowRect;<br />
<br />
		pWnd->GetWindowRect(windowRect);<br />
		pWnd->GetClientRect(clientRect);<br />
		long xDiff = windowRect.Width() - clientRect.Width();<br />
		long yDiff = windowRect.Height() - clientRect.Height();<br />
	<br />
		newClientRect.left = newClientRect.top = 0;<br />
		newClientRect.right = clientRect.right * tmNew.tmAveCharWidth / tmOld.tmAveCharWidth;<br />
		newClientRect.bottom = clientRect.bottom * newHeight / oldHeight;<br />
<br />
		if (nFlag == CDF_TOPLEFT) // resize with origin at top/left of window<br />
		{<br />
			newWindowRect.left = windowRect.left;<br />
			newWindowRect.top = windowRect.top;<br />
			newWindowRect.right = windowRect.left + newClientRect.right + xDiff;<br />
			newWindowRect.bottom = windowRect.top + newClientRect.bottom + yDiff;<br />
		}<br />
		else if (nFlag == CDF_CENTER) // resize with origin at center of window<br />
		{<br />
			newWindowRect.left = windowRect.left - <br />
							(newClientRect.right - clientRect.right)/2;<br />
			newWindowRect.top = windowRect.top -<br />
							(newClientRect.bottom - clientRect.bottom)/2;<br />
			newWindowRect.right = newWindowRect.left + newClientRect.right + xDiff;<br />
			newWindowRect.bottom = newWindowRect.top + newClientRect.bottom + yDiff;<br />
		}<br />
		pWnd->MoveWindow(newWindowRect);<br />
	}<br />
<br />
	pWnd->SetFont(pFont);<br />
<br />
	// iterate through and move all child windows and change their font.<br />
	CWnd* pChildWnd = pWnd->GetWindow(GW_CHILD);<br />
<br />
	while (pChildWnd)<br />
	{<br />
		pChildWnd->SetFont(pFont);<br />
		pChildWnd->GetWindowRect(windowRect);<br />
<br />
		CString strClass;<br />
		::GetClassName(pChildWnd->m_hWnd, strClass.GetBufferSetLength(32), 31);<br />
		strClass.MakeUpper();<br />
		if(strClass==_T("COMBOBOX"))<br />
		{<br />
			CRect rect;<br />
			pChildWnd->SendMessage(CB_GETDROPPEDCONTROLRECT,0,(LPARAM) &rect);<br />
			windowRect.right = rect.right;<br />
			windowRect.bottom = rect.bottom;<br />
		}<br />
<br />
		pWnd->ScreenToClient(windowRect);<br />
		windowRect.left = windowRect.left * tmNew.tmAveCharWidth / tmOld.tmAveCharWidth;<br />
		windowRect.right = windowRect.right * tmNew.tmAveCharWidth / tmOld.tmAveCharWidth;<br />
		windowRect.top = windowRect.top * newHeight / oldHeight;<br />
		windowRect.bottom = windowRect.bottom * newHeight / oldHeight;<br />
		pChildWnd->MoveWindow(windowRect);<br />
		<br />
		pChildWnd = pChildWnd->GetWindow(GW_HWNDNEXT);<br />
	}<br />
}