QueryFileSystem Method

Summary

Queries the TWAIN file system.

Syntax
C#
VB
C++
public void QueryFileSystem( 
   TwainFileSystem fileSystem, 
   TwainFileSystemMessage message 
) 
Public Sub QueryFileSystem( _ 
   ByVal fileSystem As TwainFileSystem, _ 
   ByVal message As TwainFileSystemMessage _ 
)  
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

Remarks

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.

Example
C#
VB
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(); 
   } 
} 
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 

Requirements

Target Platforms

Help Version 20.0.2019.9.19
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Leadtools.Twain Assembly