LTwain::QueryFileSystem

#include "ltwrappr.h"

L_INT LTwain::QueryFileSystem (FileMsg, pTwFile)

Performs certain tasks, or retrieves certain information, depending on the value of the FileMsg parameter.

Returns

Comments

This function is only valid for TWAIN file systems for digital cameras.

If the FileMsg parameter contains one of the following flags:

FILESYSTEMMSG_CHANGEDIRECTORY

FILESYSTEMMSG_CREATEDIRECTORY

FILESYSTEMMSG_DELETE

FILESYSTEMMSG_FORMATMEDIA

FILESYSTEMMSG_RENAME

FILESYSTEMMSG_COPY

the pTwFile parameter must contain the proper information before calling this function. This function will use the provided information to changes settings within the TWAIN files system.

If the FileMsg parameter contains one of the following flags:

FILESYSTEMMSG_GETCLOSE

FILESYSTEMMSG_GETFIRSTFILE

FILESYSTEMMSG_GETINFO

FILESYSTEMMSG_GETNEXTFILE

this function, will update the pTwFile parameter with the corresponding information.

If the FileMsg parameter contains the following flag:

FILESYSTEMMSG_AUTOMATICCAPTUREDIRECTORY

this function will use information stored within the pTwFile parameter and will update the pTwFile parameter with any appropriate information.

For more information on the TW_FILESYSTEM structure, please refer to the TWAIN 1.9 Specification, available at www.twain.org.

Required DLLs and Libraries

L_INT LTwain__QueryFileSystemExample(HWND hWnd) 
{ 
   L_INT             nRet; 
   LTwain            TwainSession; 
   APPLICATIONDATA   AppData; 
   TW_FILESYSTEM     twFileSys; 
   memset(&AppData, 0, sizeof(APPLICATIONDATA)); 
   AppData.hWnd = hWnd; 
   AppData.uStructSize = sizeof(AppData); 
   lstrcpy (AppData.szManufacturerName, _T("LEAD Technologies, Inc.")); 
   lstrcpy (AppData.szAppProductFamily, _T("LEAD Test Applications")); 
   lstrcpy (AppData.szVersionInfo, _T("Version 1.0")); 
   lstrcpy (AppData.szAppName, _T("TWAIN Test Application")); 
   nRet = TwainSession.InitSession(&AppData); 
   if (nRet != TWAIN_SUCCESS) 
   { 
      MessageBox(hWnd, TEXT("Error occurred during call InitSession"), TEXT("Notice"), MB_OK); 
      return nRet; 
   } 
   memset(&twFileSys, 0, sizeof(TW_FILESYSTEM)); 
   nRet = TwainSession.QueryFileSystem(FILESYSTEMMSG_AUTOMATICCAPTUREDIRECTORY, &twFileSys); 
   if (nRet != TWAIN_SUCCESS) 
   { 
      MessageBox(hWnd, TEXT("Error occurred during call QueryFileSystem"), TEXT("Notice"), MB_OK); 
      return nRet; 
   } 
   nRet = TwainSession.EndSession(); 
   if(nRet != SUCCESS) 
      return nRet; 
   return SUCCESS; 
}