C / C++ / MFC

::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;
}

#define GetImgDirEntryRVA( pNTHdr, IDE ) \
	(pNTHdr->OptionalHeader.DataDirectory[IDE].VirtualAddress)

#define GetImgDirEntrySize( pNTHdr, IDE ) \
	(pNTHdr->OptionalHeader.DataDirectory[IDE].Size)

PIMAGE_SECTION_HEADER GetEnclosingSectionHeader(DWORD rva, PIMAGE_NT_HEADERS pNTHeader) 
{
    PIMAGE_SECTION_HEADER section = IMAGE_FIRST_SECTION(pNTHeader);
    unsigned i;
    
    for ( i=0; i < pNTHeader->FileHeader.NumberOfSections; i++, section++ )
    {
		// This 3 line idiocy is because Watcom's linker actually sets the
		// Misc.VirtualSize field to 0.  (!!! - Retards....!!!)
		DWORD size = section->Misc.VirtualSize;
		if ( 0 == size )
			size = section->SizeOfRawData;
			
        // Is the RVA within this section?
        if ( (rva >= section->VirtualAddress) && 
             (rva < (section->VirtualAddress + size)))
            return section;
    }
    
    return 0;
}

LPVOID GetPtrFromRVA( DWORD rva, PIMAGE_NT_HEADERS pNTHeader, PBYTE imageBase )
{
	PIMAGE_SECTION_HEADER pSectionHdr;
	INT delta;
		
	pSectionHdr = GetEnclosingSectionHeader( rva, pNTHeader );
	if ( !pSectionHdr )
		return 0;

	delta = (INT)(pSectionHdr->VirtualAddress-pSectionHdr->PointerToRawData);
	return (PVOID) ( imageBase + rva - delta );
}

void DumpExportsSection(DWORD base, PIMAGE_NT_HEADERS pNTHeader)
{
	PIMAGE_EXPORT_DIRECTORY exportDir;
	PIMAGE_SECTION_HEADER header;
	INT delta; 
	PSTR filename;
	DWORD i;
	PDWORD functions;
	PWORD ordinals;
	PSTR *name;

	DWORD exportsStartRVA, exportsEndRVA;
    
	exportsStartRVA = GetImgDirEntryRVA(pNTHeader,IMAGE_DIRECTORY_ENTRY_EXPORT);
	exportsEndRVA = exportsStartRVA +
	   				GetImgDirEntrySize(pNTHeader, IMAGE_DIRECTORY_ENTRY_EXPORT);

	
	// Get the IMAGE_SECTION_HEADER that contains the exports.  This is
	// usually the .edata section, but doesn't have to be.
	header = GetEnclosingSectionHeader( exportsStartRVA, pNTHeader );
	if ( !header )
		return;

	delta = (INT)(header->VirtualAddress - header->PointerToRawData);
	exportDir = (PIMAGE_EXPORT_DIRECTORY)GetPtrFromRVA(exportsStartRVA, pNTHeader, base);

	/*
	header = GetSectionHeader(".edata", pNTHeader);
	if ( !header )
		return;
	exportDir = MakePtr(PIMAGE_EXPORT_DIRECTORY, base,
						 header->PointerToRawData);
	delta = (INT)(header->VirtualAddress - header->PointerToRawData);
	*/

	filename = (PSTR)(exportDir->Name - delta + base);
		
 	printf("exports table:\n\n");
	printf("  Name:            %s\n", filename);
	printf("  Characteristics: %08X\n", exportDir->Characteristics);
	printf("  TimeDateStamp:   %08X\n", exportDir->TimeDateStamp);
	printf("  Version:         %u.%02u\n", exportDir->MajorVersion,
			exportDir->MajorVersion);
	printf("  Ordinal base:    %08X\n", exportDir->Base);
	printf("  # of functions:  %08X\n", exportDir->NumberOfFunctions);
	printf("  # of Names:      %08X\n", exportDir->NumberOfNames);
	
	functions = (PDWORD)((DWORD)exportDir->AddressOfFunctions - delta + base);
	ordinals = (PWORD)((DWORD)exportDir->AddressOfNameOrdinals - delta + base);
	name = (PSTR *)((DWORD)exportDir->AddressOfNames - delta + base);

	printf("\n  Entry Pt  Ordn  Name\n");
	for ( i=0; i < exportDir->NumberOfNames; i++ )
	{
		printf("  %08X  %4u  %s\n", *functions,
				*ordinals + exportDir->Base,
				(*name - delta + base));
		name++;			// Bump each pointer to the next array element
		ordinals++;
		functions++;
	}
}

CMenu* pNewMenu = new CMenu();<br />
pNewMenu->LoadMenu(ID_YOURMENU);<br />
pNewMenu->ModifyMenu(ID_YOURID,MF_BYCOMMAND|MF_STRING,ID_YOURID,"Your Text");<br />