Generating a Log File...

Each of our products can generate a very detailed log of its activities, environment, and device interaction. Dosadi support staff rely heavily on these logfiles to resolve customer problems.

The logs are simple text files, feel free to examine one. If you will be distributing software with our software embedded in it, we recommend that you provide a way for your end-users to generate log files.

from EZTwainX

Set the property Logging to true (1). By default the log file is named eztwainx.log and is placed in the Windows 'temp' directory.

from EZTwain Pro

In your code, call to TWAIN_LogFile(1) (in most languages) or EZTwain.LogFile(1) (in VB.NET or C#) as the first call you make to EZTwain. Logging begins when this call is made, and continues until EZTwain is unloaded or your program exits. (See the User Guide for more details, and other functions related to logging.)

Run your application, reproduce the behavior of interest, then exit or shut down your application.
Locate the file eztwain.log - by default it is at c:\eztwain.log, but if C:\ is not writable the log file is redirected to the Windows 'temp' directory. Of course if your application uses TWAIN_SetLogFolder, then the log file will be in the specified folder.

from Acquire

Just add /log as a command-line option and run your command. The log file is c:\eztwain.log