C / C++ / MFC

CHAR pFileChunk[1024];
CFile arch;
CString linea;
 
if(arch.Open(("c:\\archivo.txt", CFile::modeRead ))
{
     arch.Read(pFileChunk, 1024);
     linea = CString(pFileChunk);
}

char Buffer[1025];<br />
arch.Read(Buffer,1024);

void CPPDlgParametritzacions::OnItemchangedLctrlIntroduccio(NMHDR* pNMHDR, LRESULT* pResult) 
{
	NM_LISTVIEW* pNMListView = (NM_LISTVIEW*)pNMHDR;

	// if the item is not the same that was selected before and there's one item to process...
	if ((pNMListView->iItem != this->m_iElementSeleccionatAnt) && (pNMListView->iItem != -1))
	{
		// remember which item has been selected in a member var of the dialog class that holds the listCtrl, you can also derive a listctrl and make this internally...
		this->m_iElementSeleccionatAnt = pNMListView->iItem;

		// depending on the selected state of the current item...
		if (this->m_cLCtrlParametritzacions.GetItemState(pNMListView->iItem, LVIS_SELECTED) == LVIS_SELECTED)
		{

::OnItemChanged(...) {
    static bool flag = false;
    if (flag) return;

    ...

    if (some condition)
    {
        flag = true; //lock-out OnItemChanged
        list1.SetItemState(...);
        flag = false; //re-enable OnItemChanged
    }

    ...    
}

YourClass::OnItemChanged(NMHDR* pNMHDR, LRESULT* pResult)
{
    NMLISTVIEW* pNMLV = reinterpret_cast<NMLISTVIEW*>(pNMHDR);
    //assuming you're only interested in the new selection, so check
    //whether the LVIS_SELECTED state is set
    if (!(pNMLV->uNewState & LVIS_SELECTED)) return;
 
    //Make sure m_CurrentSelection is initialised in the constructor to
    //an invalid value like -1, so that this works for the first selection.
 
    //This checks that we're not just resetting the selection back to the 
    //current one.
    if (pNMLV->iItem == m_CurrentSelection) return;
  
    if (whatever_condition_your_checking_is_okay)
    {
        //allow the new selection
        m_CurrentSelection = pNMLV->iItem;        
    }
    else
    {
        //go back to the old selection
        m_List.SetItemState(m_CurrentSelection, LVIS_SELECTED, LVIS_SELECTED);
    }
}

#include <windows.h>
#include <gdiplus.h>
#include <stdio.h>
using namespace Gdiplus;

INT GetEncoderClsid(const WCHAR* format, CLSID* pClsid);  // helper function

INT main()
{
   // Initialize GDI+.
   GdiplusStartupInput gdiplusStartupInput;
   ULONG_PTR gdiplusToken;
   GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

   CLSID             encoderClsid;
   EncoderParameters encoderParameters;
   ULONG             quality;
   Status            stat;

   // Get an image from the disk.
   Image* image = new Image(L"Shapes.bmp");

   // Get the CLSID of the JPEG encoder.
   GetEncoderClsid(L"image/jpeg", &encoderClsid);

   // Before we call Image::Save, we must initialize an
   // EncoderParameters object. The EncoderParameters object
   // has an array of EncoderParameter objects. In this
   // case, there is only one EncoderParameter object in the array.
   // The one EncoderParameter object has an array of values.
   // In this case, there is only one value (of type ULONG)
   // in the array. We will let this value vary from 0 to 100.

   encoderParameters.Count = 1;
   encoderParameters.Parameter[0].Guid = EncoderQuality;
   encoderParameters.Parameter[0].Type = EncoderParameterValueTypeLong;
   encoderParameters.Parameter[0].NumberOfValues = 1;

   // Save the image as a JPEG with quality level 0.
   quality = 0;
   encoderParameters.Parameter[0].Value = &quality;
   stat = image->Save(L"Shapes001.jpg", &encoderClsid, &encoderParameters);

   if(stat == Ok)
      wprintf(L"%s saved successfully.\n", L"Shapes001.jpg");
   else
      wprintf(L"%d  Attempt to save %s failed.\n", stat, L"Shapes001.jpg");

   // Save the image as a JPEG with quality level 50.
   quality = 50;
   encoderParameters.Parameter[0].Value = &quality;
   stat = image->Save(L"Shapes050.jpg", &encoderClsid, &encoderParameters);

   if(stat == Ok)
      wprintf(L"%s saved successfully.\n", L"Shapes050.jpg");
   else
      wprintf(L"%d  Attempt to save %s failed.\n", stat, L"Shapes050.jpg");

      // Save the image as a JPEG with quality level 100.
   quality = 100;
   encoderParameters.Parameter[0].Value = &quality;
   stat = image->Save(L"Shapes100.jpg", &encoderClsid, &encoderParameters);

   if(stat == Ok)
      wprintf(L"%s saved successfully.\n", L"Shapes100.jpg");
   else
      wprintf(L"%d  Attempt to save %s failed.\n", stat, L"Shapes100.jpg");

   delete image;
   GdiplusShutdown(gdiplusToken);
   return 0;
}