C / C++ / MFC

LPTSTR pszFileText;//this is the buffer

//....Then somewhere else where you are reading in the file content

DWORD dwFileSize;

//reading the file size
dwFileSize = ::GetFileSize(hFile, NULL);

if(dwFileSize != INVALID_FILE_SIZE)
{
   LPTSTR pszFileText;

   //Take note you are allocating memory here
   HGLOBAL hGlobal = ::GlobalAlloc(GPTR, dwFileSize + 1);

   //lock memory
   pszFileText = (LPTSTR)::GlobalLock(hGlobal);
   if(pszFileText != NULL)
   {
      DWORD dwRead;
      if(::ReadFile(hFile, pszFileText, dwFileSize, &dwRead, NULL))
        ;
      //... rest of the code
   }
   //... if you don't need the contents of the file any more do this

   //open the lock :)
   ::GlobalUnlock(hGlobal);

   //free memory allocated
   ::GlobalFree(hGlobal);
}

Jesus Loves You and Me

char* buffer;

int fileSize = WhateverToGetFileSize();

buffer = new char[fileSize];

DoStuffWithBuffer(buffer);

delete[] buffer;

Tonichka wrote:

The background application does the data acquisition, and plots each data point, also stores the data in a file.

The design is: measure, plot, measure, plot...
Every time clear and redraw with the new point.
GDI+ is used for plotting

The 3rd application is started from the user.
Just the measuring application shouldn’t be dominant and should allow other applications to run.

Tonichka wrote:

The problem is that, 3rd application can not start. The Windows freezes till the measuring is ended.