how do you get a list of open file handles?

for Windows 95/98 sample:

// OpenFiles.cpp (Windows 95/98 Only!)
//
// This example will show you how you can retrieve the information
// about what files are currently open on your Windows 95/98 system.
// The information includes the path, the way the file has been opened
// and the access and share modes.
//
// (c)1999 Ashot Oganesyan K, SmartLine, Inc
// mailto:[email protected], http://www.protect-me.com, http://www.codepile.com




#include <windows.h>
#include <stdio.h>


typedef struct _DIOC_REGISTERS { 
    DWORD reg_EBX;
    DWORD reg_EDX;
    DWORD reg_ECX;
    DWORD reg_EAX;
    DWORD reg_EDI;
    DWORD reg_ESI;
    DWORD reg_Flags;
} DIOC_REGISTERS, *PDIOC_REGISTERS;


#if !defined VWIN32_DIOC_DOS_IOCTL
#define VWIN32_DIOC_DOS_IOCTL          0x0001
#endif

// Intel x86 processor status flags
#define CARRY_FLAG                     0x0001

// Access modes 
#define OPEN_ACCESS_READONLY           0x0000
#define OPEN_ACCESS_WRITEONLY          0x0001
#define OPEN_ACCESS_READWRITE          0x0002
#define OPEN_ACCESS_RO_NOMODLASTACCESS 0x0004
// Share modes 
#define OPEN_SHARE_COMPATIBLE          0x0000
#define OPEN_SHARE_DENYREADWRITE       0x0010
#define OPEN_SHARE_DENYWRITE           0x0020
#define OPEN_SHARE_DENYREAD            0x0030
#define OPEN_SHARE_DENYNONE            0x0040
// Open flags 
#define OPEN_FLAGS_NOINHERIT           0x0080
#define OPEN_FLAGS_NO_BUFFERING        0x0100
#define OPEN_FLAGS_NO_COMPRESS         0x0200
#define OPEN_FLAGS_ALIAS_HINT          0x0400
#define OPEN_FLAGS_NOCRITERR           0x2000
#define OPEN_FLAGS_COMMIT              0x4000
// File types
#define FILENORMAL                     0x0000
#define MEMORYMAPPED                   0x0001
#define DLLOREXECUTABLE                0x0002
#define SWAPFILE                       0x0004

// Opens a handle to VWIN32 that can be used to issue low-level commands
HANDLE WINAPI OpenVWin32 (void);
// Closes the handle opened by OpenVWin32
BOOL WINAPI CloseVWin32 (HANDLE hVWin32);


void main(void)
{
	HANDLE hVWin32 = OpenVWin32();
	if (hVWin32 == INVALID_HANDLE_VALUE)
		return;

	DWORD Dev = GetLogicalDrives();
	
	DIOC_REGISTERS	regs;
	int i;
	char buf[MAX_PATH];
	BOOL fResult;
	DWORD cb;

	for (register int k=0; k<26; ++k)
	{
		if (Dev & 0x01)
		{
			i=0;
			while (TRUE)
			{
				ZeroMemory(&regs,sizeof(regs));
				regs.reg_EBX = k+1;        // Drive ID (0-Default drive,A-1,B-2,C-3,...)
				regs.reg_EDX = (DWORD)buf; // File name
				regs.reg_ECX = 0x486D;     // Enumerate Open Files
				regs.reg_EAX = 0x440D;     // IOCTL for block devices
				regs.reg_EDI = 0x0000;     // 0-enum all,1-unmovable files only
				regs.reg_ESI = i++;        // Zero-based file ID

				fResult = DeviceIoControl (hVWin32, VWIN32_DIOC_DOS_IOCTL,
									  &regs, sizeof(regs), &regs, sizeof(regs),
									  &cb, 0);

				if (!fResult || regs.reg_Flags & CARRY_FLAG)
					break;

				printf("%s\t",buf);

				switch(LOWORD(regs.reg_ECX))
				{
				case FILENORMAL:
					printf("Normal\t");
					break;
				case MEMORYMAPPED:
					printf("Memory Mapped\t");
					break;
				case DLLOREXECUTABLE:
					printf("DLL or Executable\t");
					break;
				case SWAPFILE:
					printf("Swap File\t");
					break;
				default:
					printf("Unknown\t");
					break;
				}

				if (LOWORD(regs.reg_EAX) & OPEN_ACCESS_RO_NOMODLASTACCESS)
					printf("NOMODALASTACCESS\t");
				else
				if (LOWORD(regs.reg_EAX) & OPEN_ACCESS_READWRITE)
					printf("READWRITE\t");
				else
				if (LOWORD(regs.reg_EAX) & OPEN_ACCESS_WRITEONLY)
					printf("WRITEONLY\t");
				else
					printf("READONLY\t");


				if (LOWORD(regs.reg_EAX) & OPEN_SHARE_DENYNONE)
					printf("DENYNONE\t");
				else
				if (LOWORD(regs.reg_EAX) & OPEN_SHARE_DENYWRITE)
					printf("DENYWRITE\t");
				else
				if (LOWORD(regs.reg_EAX) & OPEN_SHARE_DENYREAD)
					printf("DENYREAD\t");
				else
				if (LOWORD(regs.reg_EAX) & OPEN_SHARE_DENYREADWRITE)
					printf("DENYREADWRITE\t");
				else
					printf("COMPATIBLE\t");


				if (LOWORD(regs.reg_EAX) & OPEN_FLAGS_COMMIT)
					printf("COMMIT\n");
				else
				if (LOWORD(regs.reg_EAX) & OPEN_FLAGS_NOCRITERR)
					printf("NOCRITERR\n");
				else
				if (LOWORD(regs.reg_EAX) & OPEN_FLAGS_ALIAS_HINT)
					printf("ALIASHINT\n");
				else
				if (LOWORD(regs.reg_EAX) & OPEN_FLAGS_NO_COMPRESS)
					printf("NOCOMPRESS\n");
				else
				if (LOWORD(regs.reg_EAX) & OPEN_FLAGS_NO_BUFFERING)
					printf("NOBUFFER\n");
				else
				if (LOWORD(regs.reg_EAX) & OPEN_FLAGS_NOINHERIT)
					printf("NOINHERIT\n");
				else
					printf("\n");
			}
		}

		Dev = Dev >> 1;
	}

	CloseVWin32(hVWin32);
}



HANDLE WINAPI OpenVWin32 (void)
{ 
   return CreateFile (TEXT("\\\\.\\vwin32"), 0, 0, NULL, 0,
                      FILE_FLAG_DELETE_ON_CLOSE, NULL);
}

BOOL WINAPI CloseVWin32 (HANDLE hVWin32)
{ 
   return CloseHandle (hVWin32);
} [QUOTE]