CDHtmlDialog crash while updating frequently




/*
when using CDHtmlDialog to navigate a page frequently
and changing content and refresh it will crash in
ieframe.dll or mshtml.dll.

To avoid crash check browser busy state
before navigating a file in CDHtmlDialog

*/

//sample code to navigating html file

void CMYDHtmlDialog::NavigateFile()
{
    CString csFilePath;
    csFilePath = "c:\\sample.html";

    //wait for 1 second if not loaded or in busy state
    if( FALSE == WaitTillLoaded (1000) )
         return;

    Navigate(csFilePath, NULL, NULL);
  
}


//sample code to  wait till page lode in browser
BOOL CMYDHtmlDialog::WaitTillLoaded (int nTimeout)
{
    READYSTATE result;
    DWORD nFirstTick = GetTickCount ();

    do
    {
        m_pBrowserApp->get_ReadyState (&result);
      
        if (result != READYSTATE_COMPLETE)
            Sleep (50);
      
        if (nTimeout > 0)
        {
            if ((GetTickCount () - nFirstTick) > nTimeout)
                break;
        }
    } while (result != READYSTATE_COMPLETE);

    if (result == READYSTATE_COMPLETE)
        return TRUE;
    else
        return FALSE;
}

To view all values and size of CStringArray in watch window

In watch window, we cannot view all the elements in a CStringArray .
We can view only the first element of the CStringArray.



To View all elements Please change the following settings [For Visual Studio 2008]:
1. Open the file "c:\Program Files\Microsoft Visual Studio 9.0\Common7\Packages\Debugger\autoexp.dat" in notepad

2. Search for the line "[AutoExpand]" add the following line.

[AutoExpand]
CStringArray=size = <m_nSize> //Add this line


3. Search for the line "[Visualizer]" add the following line.

[Visualizer] //Add the below lines after this line

CStringArray{
  children
  (
   #array
   (
    expr : ($e.m_pData[$i]),
    size : ($e.m_nSize)
   )
  )
}

4. Save this file and close All Visual studio application and open again and try.

Finding current , previous and next date/time using COleDateTime




COleDateTime currdate;
COleDateTime prevdate;
COleDateTime nextday;
currdate = COleDateTime::GetCurrentTime();
CString csTime= currdate.Format(); //current date and time
     
COleDateTimeSpan span(1,0,0,0);
 
int nDay = currdate.GetDay(); //current day
 
prevdate = currdate - span;
nextday  = currdate + span;
 
int nPrevDay = prevdate.GetDay(); //yesterday or Previous day  
 
int nNextDay = nextday.GetDay(); //next day  

Creating SDI application with List View




// MainFrm.h

CSplitterWnd m_splitwnd;



//MainFrm.pp
//Override OnCreateClient using properties in classview
//CLeftView and CRightView are the class should be derived from any of view class
//like CTreeView, CListView, CFormView
// Here CRightView derived from CListView
    
BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext)
{
     //  Add following Code
     if(!m_splitwnd.CreateStatic(this,1,2))
          return FALSE;

     if(!m_splitwnd.CreateView(0,0,RUNTIME_CLASS(CLeftView),CSize(200,200),pContext) ||
          !m_splitwnd.CreateView(0,1,RUNTIME_CLASS(CRightView),CSize(100,200),pContext) )
     {
          m_splitwnd.DestroyWindow();
          return FALSE;
     }
     // End
         

     return CFrameWndEx::OnCreateClient(lpcs, pContext);
}



// RightView.cpp : implementation file
//in CRightView Class add WM_CREATE message

int CRightView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
     if (CListView::OnCreate(lpCreateStruct) == -1)
          return -1;

     GetListCtrl().DeleteAllItems();

     CListCtrl &mylist =this->GetListCtrl();

     ModifyStyle(NULL, LVS_REPORT , 0);    
     mylist.SetExtendedStyle( mylist.GetExtendedStyle() |LVS_EX_CHECKBOXES| LVS_EX_GRIDLINES | LVS_EX_FULLROWSELECT | LVS_EX_INFOTIP | LVS_EX_TWOCLICKACTIVATE | LVS_EX_SUBITEMIMAGES ); 

     mylist.InsertColumn(0, _T("S.No"),LVCFMT_LEFT| LVCF_TEXT);
     mylist.InsertColumn(1, _T("Name"), LVCFMT_LEFT| LVCF_TEXT);
     mylist.InsertColumn(2, _T("Country"), LVCFMT_LEFT| LVCF_TEXT);
     mylist.SetColumnWidth(0, LVSCW_AUTOSIZE_USEHEADER);
     mylist.SetColumnWidth(1, LVSCW_AUTOSIZE_USEHEADER);
     mylist.SetColumnWidth(2, 100);

     /*
     mylist.InsertItem( 0, _T(""));
     mylist.SetItemText( 0, 0, _T("1") );
     mylist.SetItemText( 0, 1, _T("John") );
     mylist.SetItemText( 0, 2, _T("India") );
     */

     return 0;
}

Removing Duplicates from STL Vector

#include <vector>
#include <algorithm>
using namespace std;
// Add this header files


vector<CString> vNames;   
vector<CString> ::iterator vItr;
CString csName;

vNames.push_back("John");
vNames.push_back("Victor");
vNames.push_back("Nancy");   
vNames.push_back("William");
vNames.push_back("Nancy");
sort(vNames.begin(),vNames.end());
vNames.erase(unique(vNames.begin(),vNames.end()),vNames.end());   

for(vItr=vNames.begin();vItr!=vNames.end();vItr++)
{
    csName=(*vItr);
    //TRACE(csName);
    //AfxMessageBox(csName);
}

ExtractIcon of other application

The ExtractIcon function retrieves a handle to an icon from the specified executable file, DLL, or icon file.

HICON hIcon;
hIcon = ExtractIcon( AfxGetApp()->m_hInstance, "C:\\WINDOWS\\system32\\calc.exe", 0 );
SetIcon( hIcon, FALSE );

//You must destroy the icon handle returned by ExtractIcon by calling the DestroyIcon //function.
DestroyIcon(hIcon);

Change or Hide Start button name windows XP




void ChangeOrHideStartButton()
{
     HWND hSysTrayWnd = ::FindWindow( "Shell_TrayWnd", 0 ); 
     if( hSysTrayWnd ) 
     { 
          // Get the start button  
          HWND hStartBtn = ::FindWindowEx( hSysTrayWnd, 0, "Button", "Start" ); 
          if( hStartBtn ) 
          { 
               // Hide the start button if shown or show if hidden  
               if( ::IsWindowVisible( hStartBtn )) 
               { 
                    ::ShowWindow( hStartBtn, SW_HIDE ); 
               } 
               else 
               { 
                    ::ShowWindow( hStartBtn, SW_SHOW ); 
                    //To change name
                    ::SetWindowText(hStartBtn,"Your Name");
               } 
          }

     } 
}