DWORD to CString and CString to DWORD




//DWORD to CString 
DWORD dwNumber = 1234;
CString csNumber;
csNumber.Format("%lu", dwNumber);


//CString to DWORD
DWORD dwNO;
CString csDwNumber="1234";
dwNO= atol((char*)(LPCTSTR)csDwNumber);

COM Header and lib files




/*Error 122 error LNK2019: unresolved external symbol "wchar_t * __stdcall _com_util::ConvertStringToBSTR(char const *)" (?ConvertStringToBSTR@_com_util@@YGPA_WPBD@Z
) referenced in function
"public: __thiscall _variant_t::_variant_t(char const *)"
(??0_variant_t@@QAE@PBD@Z)

Error 121 error LNK2019: unresolved external symbol "char * __stdcall _com_util::ConvertBSTRToString(wchar_t *)" (?ConvertBSTRToString@_com_util@@YGPADPA_W@Z)
referenced in function "public: char const * __thiscall _bstr_t::Data_t::GetString(void)const " (?GetString@Data_t@_bstr_t@@QBEPBDXZ)
*/

/*
Some Times when we are using COM lt will give above Linker Errors
To fix this add the following header file and library
*/


#include <comutil.h>
# pragma comment(lib, "comsuppwd.lib")

To Set a window as a topmost window




  // Set a window position as a topmost window.
::SetWindowPos( GetSafeHwnd(),
     HWND_TOPMOST,
    0, 0, 0, 0,
    SWP_NOMOVE | SWP_NOREDRAW | SWP_NOSIZE );

To set a text in Textbox using Resource ID

//To set a text in Textbox using Resource ID
//instead of CEdit member variable 
  ::SetDlgItemText(GetSafeHwnd(), IDC_EDIT1, "username");

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