Linker Errors when using InetIsOffline

Some times we will get linker errors like below when you are usnig InetIsOffline() Function.
 error LNK2019: unresolved external symbol __imp__InetIsOffline@4 referenced in function

To solve this problem add the following code after Header files include.

#pragma comment(lib,"url.lib")

(OR)

Otherwise add "url.lib" in the Linker input of your project settings.

xtreme toolkit Sample Dialog Gradient Window Example




//In Header File

#include "c:\program files\codejock software\mfc\xtreme toolkitpro v13.0.0\source\controls\xtbutton.h"
#define HIGH_DLG_CLR     RGB(163,194,236)
#define LOW_DLG_CLR     RGB(220,235,253)


//public:
//Add Two buttons
CXTButton m_btnOK;
CXTButton m_edBTNNN;




//In CPP File
BOOL CextremeSampleDlg::OnInitDialog()
{
   CDialog::OnInitDialog();

   // Add "About..." menu item to system menu.

   // IDM_ABOUTBOX must be in the system command range.
   ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
   ASSERT(IDM_ABOUTBOX < 0xF000);

   CMenu* pSysMenu = GetSystemMenu(FALSE);
   if (pSysMenu != NULL)
   {
        BOOL bNameValid;
        CString strAboutMenu;
        bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);
        ASSERT(bNameValid);
        if (!strAboutMenu.IsEmpty())
        {
             pSysMenu->AppendMenu(MF_SEPARATOR);
             pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
        }
   }

   m_btnOK.SetTheme( new CXTButtonThemeOffice2003 ( TRUE ) );
   m_edBTNNN.SetTheme( new CXTButtonThemeOfficeXP ( TRUE ) );
   // Set the icon for this dialog.  The framework does this automatically
   //  when the application's main window is not a dialog
   SetIcon(m_hIcon, TRUE);               // Set big icon
   SetIcon(m_hIcon, FALSE);          // Set small icon



   return TRUE;  // return TRUE  unless you set the focus to a control
}


void CextremeSampleDlg::OnPaint()
{
   CPaintDC dc(this); // device context for painting
   CXTPClientRect rc(this);
   CXTPPaintManager::SetTheme(xtpThemeOffice2003);  
   CXTPOffice2003Theme *pPaintManager = (CXTPOffice2003Theme *)XTPPaintManager();  
   /*pPaintManager->GradientFill(&dc, rc,
        pPaintManager->m_clrCommandBar.clrLight,
        pPaintManager->m_clrCommandBar.clrDark ,
        NULL);*/
   pPaintManager->GradientFill(&dc, rc,LOW_DLG_CLR, HIGH_DLG_CLR ,     NULL);
}

Download a webpage using WinInet




#include <wininet.h>


BOOL DownloadWebContentUsingWinInet(CString csURL,CString &csDownloadedContent)
{

     if ( csURL.IsEmpty() )
          return FALSE;
     HINTERNET hINet, hFile;
     hINet = InternetOpen("InetURL/1.0", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0 );
     if ( !hINet )
     {
          AfxMessageBox("InternetOpen Failed");
          return FALSE;
     }
     hFile = InternetOpenUrl( hINet, csURL, NULL, 0, 0, 0 ) ;
     if ( hFile )
     {
          CHAR buffer[1024];
          DWORD dwRead;
          while ( InternetReadFile( hFile, buffer, 1023, &dwRead ) )
          {
               if ( dwRead == 0 )
                    break;
               buffer[dwRead] = 0;
               csDownloadedContent += buffer;
          }
          InternetCloseHandle( hFile );
     }
     InternetCloseHandle( hINet );

     return TRUE;
}

Check whether a file exist

//Check whether a file exist
//Portable to linux


#include <sys/stat.h>
#include <string>
using namespace std;

bool FileExists(string strFilename)
{
     struct stat stFileInfo;
     bool blnReturn= false;
     int intStat=-1;
     // Attempt to get the file attributes
     intStat = stat(strFilename.c_str(),&stFileInfo);
     if(intStat == 0)
     {
          // We were able to get the file attributes
          blnReturn = true;
     }
     else
     {
          // We were not able to get the file attributes. 
          blnReturn = false;
     } 
     return blnReturn;
}

Stealing icon of another appliaction.




HICON hIcon; 
hIcon = ExtractIcon( AfxGetApp()->m_hInstance, "C:\\WINDOWS\\system32\\calc.exe", 0 ); 
SetIcon( hIcon, FALSE );
//Do at destroy of dialog
//To avoid Resourse Leak
//DestroyIcon(hIcon); 

Linker Errors when using winservice

Some times we will get linker errors like below when creating winservice.
To solve this add following code.




#pragma comment (lib, "advapi32.lib")
#pragma comment (lib, "user32.lib")

Or

include user32.lib and advapi32.lib in linker input of project settings



error LNK2019: unresolved external symbol __imp__CloseServiceHandle@4 referenced in function
error LNK2019: unresolved external symbol __imp__CreateServiceA@52 referenced in function
error LNK2019: unresolved external symbol __imp__OpenSCManagerA@12 referenced in function
error LNK2019: unresolved external symbol __imp__DeleteService@4 referenced in function
error LNK2019: unresolved external symbol __imp__OpenServiceA@12 referenced in function
error LNK2019: unresolved external symbol __imp__ControlService@12 referenced in function
error LNK2019: unresolved external symbol __imp__StartServiceA@12 referenced in function
error LNK2019: unresolved external symbol __imp__StartServiceCtrlDispatcherA@4 referenced in function
error LNK2019: unresolved external symbol __imp__SetServiceStatus@8 referenced in function
error LNK2019: unresolved external symbol __imp__RegisterServiceCtrlHandlerA@8 referenced in function
error LNK2019: unresolved external symbol __imp__PostThreadMessageA@16 referenced in function

Remove Duplicates From Vector Template Example




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

/*
Template function to Remove Duplicates
From a vector */

template <class T>
void RemoveDuplicates(vector<T> &vecContents)
{
    vector<T> ::iterator vItr;
  
    sort(vecContents.begin(),vecContents.end());
    vItr=unique(vecContents.begin(),vecContents.end());   
    if(vItr!=vecContents.end())
         vecContents.erase(vItr,vecContents.end());
}




//Usage Example 1

vector<CString> vNames; 
vNames.push_back("John");
vNames.push_back("Victor");
vNames.push_back("Nancy"); 
vNames.push_back("William");
vNames.push_back("Nancy");

RemoveDuplicates(vNames); 


//Usage Example 2
vector<int> vNos;   
vNos.push_back(1);
vNos.push_back(1);
vNos.push_back(4);

RemoveDuplicates(vNos);