QueryFileSystem Method

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

public void QueryFileSystem( 
   TwainFileSystem fileSystem,
   TwainFileSystemMessage message
)

'Declaration
 
Public Sub QueryFileSystem( _
   ByVal fileSystem As TwainFileSystem, _
   ByVal message As TwainFileSystemMessage _
)

'Usage
 
Dim instance As TwainSession
Dim fileSystem As TwainFileSystem
Dim message As TwainFileSystemMessage
 
instance.QueryFileSystem(fileSystem, message)

public void QueryFileSystem( 
   TwainFileSystem fileSystem,
   TwainFileSystemMessage message
)

 function Leadtools.Twain.TwainSession.QueryFileSystem( 
   fileSystem ,
   message 
)

public:
void QueryFileSystem( 
   TwainFileSystem^ fileSystem,
   TwainFileSystemMessage message
)

Parameters

fileSystem: TwainFileSystem contains file system information
message: Determines the Twain file system message.

Return Value

A TwainFileSystem object that represents the specified Twain file system message

This method will query Twain file system for digital cameras. And update the Twain file system upon the passed message to fileSystemMsg parameters.

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Public Sub QueryFileSystemExample(ByVal parent As IWin32Window)
   Dim session As TwainSession = New TwainSession()
   Dim fileSystem As TwainFileSystem = New TwainFileSystem()
   Dim msg As String

   Try
      session.Startup(parent, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None)
      session.QueryFileSystem(fileSystem, TwainFileSystemMessage.AutomaticCaptureDirectory)

      ' I changed the following line from "fileSystem.FileType" to "fileSystem.FileFormat"
      msg = String.Format("Input Name = {0}" & Constants.vbLf & "Output Name = {1}" & Constants.vbLf & "Recursive = {2}" & Constants.vbLf & "FileType = {3}" & Constants.vbLf & "FileSize = {4}" & Constants.vbLf & "CreateTimeDate = {5}" & Constants.vbLf & "ModifiedTimeDate = {6}" & Constants.vbLf & "FreeMediaSpace = {7}" & Constants.vbLf & "NewImageSize = {8}" & Constants.vbLf & "NumberOfFiles = {9}" & Constants.vbLf & "NumberOfAudioSnippets = {10}" & Constants.vbLf & "DeviceGroupMask = {11}" & Constants.vbLf, fileSystem.InputName, fileSystem.OutputName, fileSystem.Recursive, fileSystem.FileFormat, fileSystem.FileSize, fileSystem.CreateTimeDate, fileSystem.ModifiedTimeDate, fileSystem.FreeSpace, fileSystem.NewImageSize, fileSystem.NumberOfFiles, fileSystem.NumberOfAudioSnippets, fileSystem.DeviceGroupMask)

      MessageBox.Show(msg)
   Catch ex As Exception
      MessageBox.Show(ex.Message)
   Finally
      session.Shutdown()
   End Try
End Sub

public void QueryFileSystemExample(IWin32Window parent)
{
   TwainSession session = new TwainSession();
   TwainFileSystem fileSystem = new TwainFileSystem();
   string msg;

   try
   {
      session.Startup(parent, "manufacturer", "productFamily", "version", "application", TwainStartupFlags.None);
      session.QueryFileSystem(fileSystem, TwainFileSystemMessage.AutomaticCaptureDirectory);

      msg = String.Format("Input Name = {0}\nOutput Name = {1}\nRecursive = {2}\nFileType = {3}\nFileSize = {4}\nCreateTimeDate = {5}\nModifiedTimeDate = {6}\nFreeMediaSpace = {7}\nNewImageSize = {8}\nNumberOfFiles = {9}\nNumberOfAudioSnippets = {10}\nDeviceGroupMask = {11}\n",
         fileSystem.InputName,
         fileSystem.OutputName,
         fileSystem.Recursive,
         // I changed the following line from "fileSystem.FileType" to "fileSystem.FileFormat"
         fileSystem.FileFormat,
         fileSystem.FileSize,
         fileSystem.CreateTimeDate,
         fileSystem.ModifiedTimeDate,
         fileSystem.FreeSpace,
         fileSystem.NewImageSize,
         fileSystem.NumberOfFiles,
         fileSystem.NumberOfAudioSnippets,
         fileSystem.DeviceGroupMask);

      MessageBox.Show(msg);
   }
   catch (Exception ex)
   {
      MessageBox.Show(ex.Message);
   }
   finally
   {
      session.Shutdown();
   }
}

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

TwainSession Class
TwainSession Members
TwainFileSystem Class
Acquire Method