WDF File Access Library


This software offers API (Application Program Interface) for acquiring data from waveform data files (WDF) saved on the measurement instrument.


This software enables the following functions. Please refer to Chapter4.3 (API Detailed Specification) for details.

  • Getting Measuring Date/Time
  • Getting Measuring Trace(Channel) Information
  • Getting Measuring Points
  • Getting Time Data/Measuring Data
  • Getting Units of Time Axis/Measuring Axis
  • Getting Resolutions of Time Axis/Measuring Axis

Applicable Model

DL350, DL850EV, DL850E, DL850V, DL850, DLM3000
      Applicable DL850 series firmware version is 3.01 or later

Software Structure

This software is composed of the following software packages.

  • WDF File Access Library User’s Manual(this manual)
  • API Related files
    File Name Content
    ****.dll WDF File Access Library Body
    ****.lib DLL Import Library
    WDFAPIPublic.h Header file of Prototype Declaration
    WDFAPIWrapper.cpp Sample Code by Explicit DLL Linking

System Condition

Operating System
Windows 7(32bit/64bit), Windows 8(32bit/64bit), and Windows 10(32bit/64bit)

Core2Duo 2GHz or faster

1GB (2GB or more recommended)

Application Developing Environment
VisualStudio 2008 SP1 or later


  • This software is the special library for waveform data files saved in WDF format.
    Please do not use for waveform data files saved on other measuring instruments.
  • Can not load waveform data files saved in WDF format of newer version than the software.
  • VisualStudio 2008 SP1 is required to use this software. Please install VisualStudio 2008 SP1 Redistributable Package, when VisualStudio 2008 SP1 is not installed in PC.

Here is available for a previous firmware version.

Revision History

Version Date Contents
Ver Dec 27, 2018
  • Support for DLM3000
Ver Nov 14, 2017
  • DL850 Series firmware Ver 3.01 to 4.11
  • DL350 firmware Ver 1.01 or later



Please read Software Agreement carefully before downloading.


Release Date Dec 27, 2018
File Name WDFAPI_v5010.zip 5.6 MB


Type Software* Registration is required to download.


* Software Agreement
  • The property rights, proprietary rights, intellectual property rights, and all other rights associated with the software are held by Yokogawa Test & Measurement Corporation.
  • Under no circumstances is any dumping, reverse compiling, reverse assembly, reverse engineering, or any other kind of alteration or revision of this software allowed.
  • This software is offered free of charge, but no unlimited warranties are made against any defects whatsoever.
  • Also, Yokogawa may not be able to accept inquiries regarding repair of defects in or questions about this software.
  • The contents of this software are subject to change without prior notice as a result of continuing improvements to the software's performance and functions.
  • Yokogawa bears no liability for any problems that may occur during download or installation of this software.
  • Use of the Yokogawa Web site is at the user's own risk.
  • Any parties contributing to the creation or distribution of the contents on the Yokogawa Web site shall bear no responsibility whatsoever for any damages occurring as a result of the use of said contents.

Downloading of the software indicates acceptance of the software agreement.

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