QueryFileSystem Method

C#
Visual Basic
Java
Objective-C
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
)

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 the TWAIN file system for digital cameras, and update the TWAIN file system based on the message passed to the fileSystemMsg parameters.

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

Copy Code

Imports Leadtools
Imports Leadtools.Twain

Public Sub QueryFileSystemExample(ByVal parent As IntPtr)
   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

using Leadtools;
using Leadtools.Twain;

public void QueryFileSystemExample(IntPtr 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

Reference

TwainSession Class
TwainSession Members
TwainFileSystem Class
Acquire Method