C / C++ / MFC

1 2 + 3 * [3 * (1 + 2) = 9]
1 2 3 + * [(3 + 2) * 1 = 5]

number stack: 3 2 1
operation stack: * +

struct stack_element
{
  bool is_operation;
  // the rest you can figure it out: some set of fields
  // or another will be used depending on is_operation
}

• If the top element of the stack is a number, this is what the stack evaluates to.
• If the top element is an operation then:
  1. Extract it from the stack.
  2. Recursively evaluate the first operand, yielding a number and leaving the expression for the second operand in the stack.
  3. Evaluate the second operand the same way.
  4. You have your operation and your two operands, calculate this and you're done.

CCommandLineInfo cmdInfo;
ParseCommandLine(cmdInfo);

void CYourCmdLineInfo::ParseParam(const TCHAR* pszParam,BOOL bFlag,BOOL bLast)
{
	if( bFlag )
	{
		if( lstrcmpi(pszParam, _T("MyFlag")) == 0 )
		{
			bMyFlag = true;
		}
		else if( lstrcmpi(pszParam, _T("MyOtherFlag") == 0 )
		{
			bMyOtherFlag = true;
		}
	}
	CCommandLineInfo::ParseParam(pszParam, bFlag, bLast);
}

"Opinions are neither right nor wrong. I cannot change your opinion of me. I can, however, change what influences your opinion." - David Crow

CString	csPrinterName = printDialog->GetDeviceName();
_TCHAR	*szPrinterName = csPrinterName.GetBuffer(0);
DWORD	dwRet;
HANDLE	hPrinter;
 
if (!OpenPrinter(szPrinterName, &hPrinter, NULL))
	return;
 
LPDEVMODE lpDevMode;
 
dwRet = DocumentProperties(m_hWnd, hPrinter, szPrinterName, NULL, NULL, 0);
lpDevMode = (LPDEVMODE)malloc(dwRet);
dwRet = DocumentProperties(m_hWnd, hPrinter, szPrinterName, lpDevMode, NULL, DM_OUT_BUFFER);
if (dwRet != IDOK)
	{
	free(lpDevMode);
	ClosePrinter(hPrinter);
	return;
	}
if ((lpDevMode->dmFields & DM_ORIENTATION))
	lpDevMode->dmOrientation = DMORIENT_LANDSCAPE;
//
// add in here any other changes to the DEVMODE you need
// (paper size etc.)
//
dwRet = DocumentProperties(m_hWnd, hPrinter, szPrinterName, lpDevMode, lpDevMode, DM_IN_BUFFER|DM_OUT_BUFFER);
ClosePrinter(hPrinter);
if (dwRet != IDOK)
	{
	free(lpDevMode);
	return;
	}
pDC->ResetDC(lpDevMode);
free(lpDevMode);

void CMyView::OnMeasureItem(int nIDCtl, LPMEASUREITEMSTRUCT lpMeasureItemStruct)
{
...
...
...
    lpMeasureItemStruct->itemHeight = nNewHeight;
...
...
...
}

LRESULT CALLBACK CODMenu::HookFunction(int code, WPARAM wParam, LPARAM lParam)
{
    CWPSTRUCT * cwpStruct = (CWPSTRUCT*)(lParam);
    
    ASSERT(m_activeObject != NULL);
    switch (cwpStruct->message)
    {
    case WM_MEASUREITEM:
        {
            LPMEASUREITEMSTRUCT lpMIS = (LPMEASUREITEMSTRUCT)(cwpStruct->lParam);
            m_activeObject->OnMeasureItem(cwpStruct->wParam, lpMIS);
            TRACE("Measure Item is %1d by %1d\n", lpMIS->itemWidth, lpMIS->itemHeight);
        }
        break;
    case WM_DRAWITEM:
        {
            m_activeObject->OnDrawItem(cwpStruct->wParam, (LPDRAWITEMSTRUCT)(cwpStruct->lParam));
            TRACE("WM_DRAWITEM\n");
        }
        break;
    }
    return ::CallNextHookEx(m_hookHandle, code, wParam, lParam);
}

LRESULT CALLBACK CODMenu::HookFunctionAfter(int code, WPARAM wParam, LPARAM lParam)
{
    CWPRETSTRUCT * cwpretStruct = (CWPRETSTRUCT*)(lParam);
    
    ASSERT(m_activeObject != NULL);
    switch (cwpretStruct->message)
    {
    case WM_INITMENUPOPUP:
        {
            m_activeObject->OnInitMenuPopup(CMenu::FromHandle((HMENU)cwpretStruct->wParam), LOWORD(cwpretStruct->lParam), (BOOL)HIWORD(cwpretStruct->lParam));
            TRACE("WM_INITMENUPOPUP\n");
        }
        break;
    case WM_MEASUREITEM:
        {
            LPMEASUREITEMSTRUCT lpMIS = (LPMEASUREITEMSTRUCT)(cwpretStruct->lParam);
            TRACE("After Measure Item is %1d by %1d\n", lpMIS->itemWidth, lpMIS->itemHeight);
        }
        break;
    }
    return ::CallNextHookEx(m_hookHandleAfter, code, wParam, lParam);
}

WM_INITMENUPOPUP
Measure Item is 99 by 19
Warning: unknown WM_MEASUREITEM for menu item 0xE100.
After Measure Item is 0 by 16
Measure Item is 116 by 19
Warning: unknown WM_MEASUREITEM for menu item 0xE101.
After Measure Item is 0 by 16
Measure Item is 66 by 19
Warning: unknown WM_MEASUREITEM for menu item 0xE102.
After Measure Item is 0 by 16
Measure Item is 102 by 19
Warning: unknown WM_MEASUREITEM for menu item 0xE103.
After Measure Item is 0 by 16
Measure Item is 94 by 19
Warning: unknown WM_MEASUREITEM for menu item 0xE104.
After Measure Item is 0 by 16
Measure Item is 0 by 3
Warning: unknown WM_MEASUREITEM for menu item 0x0000.
After Measure Item is 0 by 16
Measure Item is 111 by 19
Warning: unknown WM_MEASUREITEM for menu item 0xE107.
After Measure Item is 0 by 16
Measure Item is 110 by 19
Warning: unknown WM_MEASUREITEM for menu item 0xE109.
After Measure Item is 0 by 16
Measure Item is 110 by 19
Warning: unknown WM_MEASUREITEM for menu item 0xE106.
After Measure Item is 0 by 16
Measure Item is 0 by 3
Warning: unknown WM_MEASUREITEM for menu item 0x0000.
After Measure Item is 0 by 16
Measure Item is 93 by 19
Warning: unknown WM_MEASUREITEM for menu item 0xE110.
After Measure Item is 0 by 16
Measure Item is 0 by 3
Warning: unknown WM_MEASUREITEM for menu item 0x0000.
After Measure Item is 0 by 16
Measure Item is 56 by 19
Warning: unknown WM_MEASUREITEM for menu item 0xE141.
After Measure Item is 0 by 16
Draw Item is 12 by 16
WM_DRAWITEM
Draw Item is 12 by 16
WM_DRAWITEM
Draw Item is 12 by 16
WM_DRAWITEM
Draw Item is 12 by 16
WM_DRAWITEM
Draw Item is 12 by 16
WM_DRAWITEM
Draw Item is 12 by 16
WM_DRAWITEM
Draw Item is 12 by 16
WM_DRAWITEM
Draw Item is 12 by 16
WM_DRAWITEM
Draw Item is 12 by 16
WM_DRAWITEM
Draw Item is 12 by 16
WM_DRAWITEM
Draw Item is 12 by 16
WM_DRAWITEM
Draw Item is 12 by 16
WM_DRAWITEM
Draw Item is 12 by 16
WM_DRAWITEM

LRESULT CALLBACK MyHook(int nCode, WPARAM wp, LPARAM lp)
{
   ...
   return 1;
}