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Learn more about Teams // Load the NTDLL entry point we need if( !(NtFsControlFile = (void *) GetProcAddress( GetModuleHandle(TEXT("ntdll.dll")), "NtFsControlFile" )) ) { _tprintf(TEXT("\nCould not find NtFsControlFile entry point in NTDLL.DLL\n")); exit(1); if( !(RtlNtStatusToDosError = (void *) GetProcAddress( GetModuleHandle(TEXT("ntdll.dll")), "RtlNtStatusToDosError" )) ) { _tprintf(TEXT("\nCould not find RtlNtStatusToDosError entry point in NTDLL.DLL\n")); exit(1);

I have these errors at if(!NtFsControlFile = and if( !(RtlNtStatusToDosError = ,

error C2440: '=' : cannot convert from 'void *' to 'NTSTATUS (__stdcall *)(HANDLE,HANDLE,PIO_APC_ROUTINE,PVOID,PIO_STATUS_BLOCK,ULONG,PVOID,ULONG,PVOID,ULONG)'
         Conversion from 'void*' to pointer to non-'void' requires an explicit cast
error C2440: '=' : cannot convert from 'void *' to 'ULONG (__stdcall *)(NTSTATUS)'
         Conversion from 'void*' to pointer to non-'void' requires an explicit cast
The original page2 was  C language file. I need to cast that and how to do it or how can I resolve the problem.
Thanks a lot.
SOLUTION THAT SEEMS TO WORK(NO AUTOMATICALLY CAST LIKE C LANGUAGE):
     // a typedef to make casting easier
    typedef NTSTATUS (__stdcall *NtFsControlFilePtr)(
        HANDLE FileHandle,
        HANDLE Event,
        PIO_APC_ROUTINE ApcRoutine,
        PVOID ApcContext,
        PIO_STATUS_BLOCK IoStatusBlock,
        ULONG FsControlCode,
        PVOID InputBuffer,
        ULONG InputBufferLength,
        PVOID OutputBuffer,
        ULONG OutputBufferLength);
// the actual pointer to function
NtFsControlFilePtr NtFsControlFile;
// and the GetProcAddress call
    if( !(NtFsControlFile = reinterpret_cast<NtFsControlFilePtr>( GetProcAddress( GetModuleHandle(TEXT("ntdll.dll")),
            "NtFsControlFile" ))) ) {
        _tprintf(TEXT("\nCould not find NtFsControlFile entry point in NTDLL.DLL\n"));
        exit(1);
THIS SOLUTION WORKS BUT  YOU GET:
C4191: 'reinterpret_cast' : unsafe conversion
with /WALL
to avoid warning:
if( !(NtFsControlFile = reinterpret_cast<NtFsControlFilePtr>( reinterpret_cast< void* >( GetProcAddress( GetModuleHandle(TEXT("ntdll.dll")), 
        "NtFsControlFile" )))))  {
        _tprintf(TEXT("\nCould not find NtFsControlFile entry point in NTDLL.DLL\n"));
        exit(1);
   if( !(RtlNtStatusToDosError = reinterpret_cast<RtlNtStatusToDosErrorPtr>( reinterpret_cast< void* >( GetProcAddress( GetModuleHandle(TEXT("ntdll.dll")), 
        "NtFsControlFile" )))))  {
        _tprintf(TEXT("\nCould not find NtFsControlFile entry point in NTDLL.DLL\n"));
        exit(1);
declare the variable:
typedef NTSTATUS (__stdcall *NT_FS_CONTROL_FILE)(IN HANDLE FileHandle,
                      IN  HANDLE Event, IN PIO_APC_ROUTINE  ApcRoutine,
                      IN PVOID ApcContext, OUT PIO_STATUS_BLOCKIoStatusBlock,
                      IN ULONG FsControlCode, IN PVOID InputBuffer,
                      IN ULONG InputBufferLength, OUT  PVOID OutputBuffer,
                      IN ULONG OutputBufferLength);
NT_FS_CONTROL_FILE nt_fs_control_file;
Then you need
nt_fs_control_file = GetProcAddress(
nt_fs_control_file = (NT_FS_CONTROL_FILE)GetProcAddress
To call your function:
NTSTATUS status = nt_fs_control_file(....);
        
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