C# Signature:

[DllImport("ntdll.dll", SetLastError=true)] static extern IntPtr NtQueryInformationFile(IntPtr fileHandle, ref IO_STATUS_BLOCK IoStatusBlock, IntPtr pInfoBlock, uint length, FILE_INFORMATION_CLASS fileInformation);

VB Signature:

Declare Function NtQueryInformationFile Lib "ntdll.dll" (ByVal fileHandle As IntPtr, ByRef IoStatusBlock As IO_STATUS_BLOCK, ByVal pInfoBlock As IntPtr, ByVal length As UInteger, ByVal fileInformation As FILE_INFORMATION_CLASS) As IntPtr

VB User-Defined Types:

    Structure IO_STATUS_BLOCK
        Dim status As UInteger
        Dim information As ULong
    End Structure

    Enum FILE_INFORMATION_CLASS
        FileDirectoryInformation = 1
        FileFullDirectoryInformation
        FileBothDirectoryInformation
        FileBasicInformation
        FileStandardInformation
        FileInternalInformation
        FileEaInformation
        FileAccessInformation
        FileNameInformation
        FileRenameInformation
        FileLinkInformation
        FileNamesInformation
        FileDispositionInformation
        FilePositionInformation
        FileFullEaInformation
        FileModeInformation = 16
        FileAlignmentInformation
        FileAllInformation
        FileAllocationInformation
        FileEndOfFileInformation
        FileAlternateNameInformation
        FileStreamInformation
        FilePipeInformation
        FilePipeLocalInformation
        FilePipeRemoteInformation
        FileMailslotQueryInformation
        FileMailslotSetInformation
        FileCompressionInformation
        FileObjectIdInformation
        FileCompletionInformation
        FileMoveClusterInformation
        FileQuotaInformation
        FileReparsePointInformation
        FileNetworkOpenInformation
        FileAttributeTagInformation
        FileTrackingInformation
        FileIdBothDirectoryInformation
        FileIdFullDirectoryInformation
        FileValidDataLengthInformation
        FileShortNameInformation
        FileHardLinkInformation = 46
    End Enum

C# User-Defined Types:

    struct IO_STATUS_BLOCK
    {
        uint status;
        ulong information;
    }

    enum FILE_INFORMATION_CLASS
    {
        FileDirectoryInformation = 1,     // 1
        FileFullDirectoryInformation,     // 2
        FileBothDirectoryInformation,     // 3
        FileBasicInformation,         // 4
        FileStandardInformation,      // 5
        FileInternalInformation,      // 6
        FileEaInformation,        // 7
        FileAccessInformation,        // 8
        FileNameInformation,          // 9
        FileRenameInformation,        // 10
        FileLinkInformation,          // 11
        FileNamesInformation,         // 12
        FileDispositionInformation,       // 13
        FilePositionInformation,      // 14
        FileFullEaInformation,        // 15
        FileModeInformation = 16,     // 16
        FileAlignmentInformation,     // 17
        FileAllInformation,           // 18
        FileAllocationInformation,    // 19
        FileEndOfFileInformation,     // 20
        FileAlternateNameInformation,     // 21
        FileStreamInformation,        // 22
        FilePipeInformation,          // 23
        FilePipeLocalInformation,     // 24
        FilePipeRemoteInformation,    // 25
        FileMailslotQueryInformation,     // 26
        FileMailslotSetInformation,       // 27
        FileCompressionInformation,       // 28
        FileObjectIdInformation,      // 29
        FileCompletionInformation,    // 30
        FileMoveClusterInformation,       // 31
        FileQuotaInformation,         // 32
        FileReparsePointInformation,      // 33
        FileNetworkOpenInformation,       // 34
        FileAttributeTagInformation,      // 35
        FileTrackingInformation,      // 36
        FileIdBothDirectoryInformation,   // 37
        FileIdFullDirectoryInformation,   // 38
        FileValidDataLengthInformation,   // 39
        FileShortNameInformation,     // 40
        FileHardLinkInformation=46    // 46    
    }

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

Tips & Tricks:

Please add some!

Sample Code:

Please add some!

For FILE_INFORMATION_CLASS, see: http://msdn.microsoft.com/en-us/library/cc232064.aspx

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).