C / C++ / MFC

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

BOOL CSMyScrollView::OnMouseWheel(UINT nFlags, short zDelta, CPoint pt) 
{
    return CScrollView::OnMouseWheel(nFlags, zDelta, pt);
}

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

void MyClass::OnHandleE()
{
  CYourDialog dlg;
  dlg.Caller( isE );

  dlg.DoModal();
}
void MyClass::OnHandleF()
{
  CYourDialog dlg;
  dlg.Caller( isF );

  dlg.DoModal();
}
void MyClass::OnHandleG()
{
  CYourDialog dlg;
  dlg.Caller( isG );

  dlg.DoModal();
}

BEGIN_MESSAGE_MAP(CMyDoc, CDocument)
	//{{AFX_MSG_MAP(CMyDoc)
	ON_COMMAND(ID_ITEM_ADD, OnItemAdd)
	ON_COMMAND(ID_ITEM_EDIT, OnItemEdit)
	ON_COMMAND(ID_ITEM_DELETE, OnItemDelete)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()
 
void CMyDoc::OnItemAdd() 
{
    CMyDialog dlg(1);
    dlg.DoModal();
}
 
void CMyDoc::OnItemEdit() 
{
    CMyDialog dlg(2);
    dlg.DoModal();
}
 
void CMyDoc::OnItemDelete() 
{
    CMyDialog dlg(3);
    dlg.DoModal();
}

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

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

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

void CMainFrame::OnWaveformsummationUserdefinedgrouping()
{
    SwitchToView(ANALYSEMULWAVEFORM, 1);
}
 
void CMainFrame::OnWaveformsummationGp246()
{
    SwitchToView(ANALYSEMULWAVEFORM, 2);
}
 
void CMainFrame::OnWaveformsummationGp123()
{
    SwitchToView(ANALYSEMULWAVEFORM, 3);
}
 
void CMainFrame::OnAnalyseWaveformdiff()
{
    SwitchToView(ANALYSEMULWAVEFORM, 4);
}
 
void CMainFrame::SwitchToView(eview nView, int nOpt)
{
    ...
    pnew = (CView *) new CAnalyseMultipleWaveform(nOpt);
}

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

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

std::string myfunc()
{
    // allocate buffer etc...
    ...
    // get data etc...
    ...
    // ok, if pData holds a null terminate c-str
    std::string strRet = (const char*)pData;
    // finished with pData, now free it
    ...
    return strRet;
}
//
// Problem with above: To many constructor calls.
// 1) std::string strRet = (const char*)pData;
// 2) std::string str = myfunc();
// In 2 you are copying from the string returned
// by myfunc() to the string in caller and then
// the string created in myfunc() is destroyed.
//
// Better myfunc() with 1 constructor call
bool myfunc(std::string& strRet)
{
    // allocate buffer etc...
    ...
    // get data etc...
    ...
    // ok, if pData holds a null terminate c-str
    strRet = (const char*)pData;
    // finished with pData, now free it
    ...
    // if we made it here, every thing is ok
    return true;
}