LTwain::FastAcquire

#include "ltwrappr.h"

virtual L_INT LTwain::FastAcquire (pszBaseFileName, uFlags, uTransferMode, nFormat, nBitsPerPixel, bMultiPageFile, uUserBufSize, bUsePrefferedBuffer)

Acquires image(s) from a TWAIN source and stores the image file(s) using Fast TWAIN feature. This function is available in the Document/Medical Toolkits.

Returns

Comments

Based on the scanner type, this function determines the best and fastest scanning method to use. This method is used for actual scanning (Real scanning not for testing) of the image(s). You may can call LTwain::FindFastConfig before calling this function to retrieve the best scanning configuration in pOutBestConfig parameter, and then pass the values of members in pOutBestConfig to this function.

If the file format specified in nFormat does not support multi-page files, the value of bMultiPageFile will be ignored and the function will automatically save the acquired images into separate files. The naming of the files will be carried out as follows: if the string in pszBaseFileName is "Temp.jpg", the method will append the number of the image, 0001, 0002, etc, to the file name. Therefore, the output file names will be "Temp0001.jpg", "Temp0002.jpg", etc.

If the file format supports multi-page files, this function will use the bMultiPageFile parameter to determine how to save multiple images. If bMultiPageFile is FALSE, each scanned page will be saved to a separate file, named in the same manner described in the paragraph above. If bMultiPageFile is TRUE, the name of the output file will be exactly the string in pszBaseFileName (e.g. "Temp.jpg") and it will be saved as a multi-page file.

To cancel the acquire operation call the LTwain::CancelAcquire.

To stop acquire images only from the feeder of the TWAIN source, call the LTwain::StopFeeder within the LTwain::AcquireCallBack function when its fired.

You can achieve the same functionality to this function by using the LTwain::AcquireMulti.

The LTWAIN_KEEPOPEN flag works only in the following cases:

Required DLLs and Libraries

See Also

Example

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName
L_VOID CFastTwain::AcquireCallBack(L_INT nPage, L_TCHAR* pszFileName, L_BOOL bFinishScan)
{
   L_TCHAR szTemp[MAX_PATH];
   if (bFinishScan)
   {
      wsprintf(szTemp, TEXT("The page # %d is scanned and saved to file name %s\n"), nPage, pszFileName);
      MessageBox(NULL, szTemp, TEXT("Notice"), MB_OK);
   }
}
L_INT LTwain__FastAcquireExample(HWND hWnd, CFastTwain *MyClass)
{
   L_INT             nRet;
   L_BOOL            bAvailable;
   APPLICATIONDATA   AppData;
   /* Check to see if TWAIN is installed */
   bAvailable = MyClass->IsAvailable();
   if (bAvailable)
   {
      AppData.hWnd = hWnd; 
      lstrcpy (AppData.szManufacturerName, TEXT("LEAD Technologies, Inc.")); 
      lstrcpy (AppData.szAppProductFamily, TEXT("LEAD Test Applications"));
      lstrcpy (AppData.szVersionInfo, TEXT("Version 1.0"));
      lstrcpy (AppData.szAppName, TEXT("TWAIN Test Application"));
      nRet = MyClass->InitSession(&AppData); 
      if(nRet != SUCCESS)
         return nRet;
   }
   MyClass->EnableCallBack (TRUE);
   nRet = MyClass->FastAcquire(
                              MAKE_IMAGE_PATH(TEXT("test.bmp")),
                              LTWAIN_SHOW_USER_INTERFACE,
                              LTWAIN_FILE_MODE,
                              FILE_BMP,
                              1,
                              TRUE,
                              0, 
                              TRUE);
   if (nRet == SUCCESS)
      MessageBox(hWnd, TEXT("Fast Twain function was successful"), TEXT("Notice"), MB_OK);
   else
      MessageBox(hWnd, TEXT("Error occurred during fast Twain function!!!"), TEXT("Error!!!"), MB_OK);
   return nRet;
}