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GetOpenFileName (comdlg32)
.
"Creates an Open dialog box that lets the user specify the drive, directory, and the name of a file or set of files to be opened."
<DllImport("comdlg32.dll", SetLastError:=True, CharSet:=CharSet.Auto)> _
Private Shared Function GetOpenFileName(<[In], Out> ByVal ofn As OpenFileName) As Boolean
End Function
<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Auto)> _
Public Class OpenFileName
Public structSize As Integer = 0
Public dlgOwner As IntPtr = IntPtr.Zero
Public instance As IntPtr = IntPtr.Zero
Public filter As String = Nothing
Public customFilter As String = Nothing
Public maxCustFilter As Integer = 0
Public filterIndex As Integer = 0
Public file As String = Nothing
Public maxFile As Integer = 0
Public fileTitle As String = Nothing
Public maxFileTitle As Integer = 0
Public initialDir As String = Nothing
Public title As String = Nothing
Public flags As Integer = 0
Public fileOffset As Short = 0
Public fileExtension As Short = 0
Public defExt As String = Nothing
Public custData As IntPtr = IntPtr.Zero
Public hook As IntPtr = IntPtr.Zero
Public templateName As String = Nothing
Public reservedPtr As IntPtr = IntPtr.Zero
Public reservedInt As Integer = 0
Public flagsEx As Integer = 0
End Class 'OpenFileName
Public Class LibWrap
'BOOL GetOpenFileName(LPOPENFILENAME lpofn);
Declare Auto Function GetOpenFileName Lib "Comdlg32.dll" ( _
<[In](), Out()> ByVal ofn As OpenFileName) As Boolean
End Class 'LibWrap
Private Function ShowOpen(Optional ByVal filter As String = ("All files" & ChrW(0) & "*.*" & ChrW(0)), _
Optional ByVal title As String = "Open File Dialog...", _
Optional ByVal defext As String = "*", _
Optional ByVal path As String = "C:\") As String
If LibWrap.GetOpenFileName(ofn) Then
Console.WriteLine("Selected file with full path: {0}", ofn.file)
Console.WriteLine("Selected file name: {0}", ofn.fileTitle)
Console.WriteLine("Offset from file name: {0}", ofn.fileOffset)
Console.WriteLine("Offset from file extension: {0}", ofn.fileExtension)
Return ofn.file
End If
Catch ex As Exception
Debug.Assert(False)
Return System.String.Empty
End Try
[<Struct>]
[<StructLayout(LayoutKind.Sequential)>]
type OpenFileName =
val mutable lStructSize: int
val mutable hwndOwner: nativeint
val mutable hInstance: nativeint
val mutable lpstrFilter: string
val mutable lpstrCustomFilter: string
val mutable nMaxCustFilter: int
val mutable nFilterIndex: int
val mutable lpstrFile: string
val mutable nMaxFile: int
val mutable lpstrFileTitle: string
val mutable nMaxFileTitle: int
val mutable lpstrInitialDir: string
val mutable lpstrTitle: string
val mutable Flags: Flags
val mutable nFileOffset: int16
val mutable nFileExtension: int16
val mutable lpstrDefExt: string
val mutable lCustData: nativeint
val mutable lpfnHook: nativeint
val mutable lpTemplateName: string
val mutable pvReserved: nativeint
val mutable dwReserved: int
val mutable FlagsEx: int
let mutable ofn = OpenFileName ()
ofn.lStructSize <- Marshal.SizeOf (ofn)
//The first character of this buffer must be NULL if initialization is not necessary.
ofn.lpstrFile <- Char.MinValue.ToString () + new string (' ', 256)
ofn.nMaxFile <- ofn.lpstrFile.Length
ofn.lpstrFileTitle <- new string (' ', 64)
ofn.nMaxFileTitle <- ofn.lpstrFileTitle.Length
ofn.Flags <- Flags.OFN_FILEMUSTEXIST ||| Flags.OFN_PATHMUSTEXIST
if (GetOpenFileName (&ofn)) then
Choice1Of2 ofn.lpstrFile
else
Choice2Of2 (sprintf "GetOpenFileName failed with the error code: %d" (Marshal.GetLastWin32Error ()))
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