Getting Local Application Path in XP & Vista

typedef HRESULT (WINAPI * SHGetKnownFolderPathFn)(REFKNOWNFOLDERID rfid, DWORD dwFlags, HANDLE hToken,PWSTR *ppszPath);

PWSTR pszPath[1];
SHGetKnownFolderPathFn shGetKnownFolrPth = NULL ;

HINSTANCE hins = LoadLibrary(”Shell32.dll”);

if(hins != NULL)
{

shGetKnownFolrPth = (SHGetKnownFolderPathFn)::GetProcAddress(hins,”SHGetKnownFolderPath”);

if( shGetKnownFolrPth != NULL)
{
shGetKnownFolrPth(FOLDERID_LocalAppDataLow,0,NULL,pszPath);
CString csData=pszPath[0]; // converting from wchar to ANSI.
}
}





int GetCurrentUserLocalLowAppPath(LPTSTR szProfileDir,int dirlen )
{

memset(szProfileDir,0,dirlen);

if(IsWinXP() == TRUE)
{
GetCurrentUserAppPath( szProfileDir, dirlen );
}
else if(IsVista() == TRUE)
{
PWSTR pszPath[1];
SHGetKnownFolderPath(NULL,FOLDERID_LocalAppDataLow,0,NULL,pszPath);
//copying the pszPath to szProfileDir array
}
return 1;

}

VC++ Code equivalent to DoEvents is Visual basic

//VC++ Code equivalent to DoEvents is Visual basic

void DoEvents()
{
MSG msg;

while ( ::PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE ) )
{
if ( ::GetMessage(&msg, NULL, 0, 0))
{
::TranslateMessage(&msg);
::DispatchMessage(&msg);
}
else
{
break;
}
}
}

MFC code to get the Path of Appliction and DLL

//MFC code to get the Path of  Appliction
CString GetExePath ()
{
   TCHAR szPath[_MAX_PATH];
   szPath[0] = '\0';

   GetModuleFileName( NULL, szPath, sizeof(szPath) );

   CString csPath(szPath);

   int nPos = csPath.ReverseFind('\\');
   if ( nPos != -1)
   {
       csPath = csPath.Left(nPos+1);
   }
   else
   {
       csPath = "";
   }

   return csPath ;

}


//MFC code to get the Path of  DLL if it is loaded from different path
#include <atlbase.h>
CString GetDLLPath ()
{
   TCHAR szPath[_MAX_PATH];
   szPath[0] = '\0';

   GetModuleFileName((HINSTANCE)&__ImageBase, szPath, sizeof(szPath) );

   CString csPath(szPath);

   int nPos = csPath.ReverseFind('\\');
   if ( nPos != -1)
   {
       csPath = csPath.Left(nPos+1);
   }
   else
   {
       csPath = "";
   }

   return csPath ;

}

Useful Cstring Functions




//For replacing  nonprintable and non-ASCII unicode to space
CString RemoveNonPrintableCharWithSpacer(LPCSTR lpText)
{
     CString csData;
     for(;*lpText!='\0'; lpText++)
     {
          if(*lpText<0 || *lpText>255)
          {
               csData += " ";
          }
          else
          {
               csData += *lpText;
          }
     }

     return csData;
}



//For counting no of small characters
unsigned int CountSmallCharacters(LPCTSTR lpText)
{
     unsigned int nSCharCount =0;
     for(;*lpText!='\0'; lpText++)
     {
          if(*lpText>='a' && *lpText <='z')
               nSCharCount++;
     }
     return nSCharCount;
}



//For counting no of characters
unsigned int CountCharacters(LPCTSTR lpText)
{
     unsigned int nCharCount =0;
     for(;*lpText!='\0'; lpText++)
     {
          if( (*lpText>='a' && *lpText <='z') || (*lpText>='A' && *lpText <='Z') )
               nCharCount++;
     }
     return nCharCount;
}

Code to Click Internt Explorer Security warning Dialog Box

//Code to Click Internt Explorer Security warning Dialog Box Automatically

BOOL g_bStopDialogWatcherThread = FALSE; // To Stop & start Thread

UINT WindowWatcher(LPVOID lpParam)
{
g_bStopDialogWatcherThread = FALSE;
while(1)
{
Sleep(300);
HWND hWnd;
HWND hWndWarning = ::FindWindow(NULL,"Internet Explorer");
hWnd=::FindWindowEx(hWndWarning , NULL , "Button","&Yes" );
if(hWnd!=NULL && hWndWarning!=NULL)
{
::SetForegroundWindow(hWndWarning);
::SetFocus(hWnd);
::PostMessage ( hWnd , WM_LBUTTONDOWN , 0 , 0 );
::PostMessage ( hWnd , WM_LBUTTONUP , 0 , 0 );
Sleep(1000);
}

if(g_bStopDialogWatcherThread)
{
break;
}
}
return 1;
}

AfxBeginThread(WindowWatcher,THREAD_PRIORITY_NORMAL,0,0,0);//to start the thread

How to empty recycle bin programmatically?

While processing or writing huge files to disk, its quite possible that disk will go out of space. To Squeeze and to get more disk space, its a good idea to clean the recycle bin. But how to do it programmatically?


You can use the api - SHEmptyRecycleBin(). See the code snippet below.

SHEmptyRecycleBin( NULL, NULL, SHERB_NOCONFIRMATION | SHERB_NOPROGRESSUI | SHERB_NOSOUND );

Note:
By modifying the options, you can show progress UI, Show confirmation dialog and play sound on finishing task. Just remove the unwanted flags.

Interprocess communication between two application in MFC

This is the example to show how to send a cstring from one application to another.


Paste this follwing code at sender.

CString csData(_T(""));
csData=" This is the message";
COPYDATASTRUCT copyDT;//Is used for Interprocess communication
copyDT.dwData = NULL;
copyDT.cbData = _tcslen(csData) + 1;
copyDT.lpData = ( void* ) ( ( LPCTSTR ) csData );
HWND hWnd = ::FindWindow(NULL,"Receiver application");
// Finding the handle of receiver application and send

// WM_COPYDATA message is used for Interprocess communication
if(hWnd!=NULL)
{
::SendMessage( hWnd, WM_COPYDATA, 0, (LPARAM)&copyDT );
}


At receiver add WM_COPYDATA message.
Paste the following code

CString csReceived;
csReceived=(LPCTSTR)pCopyDataStruct->lpData;