Dynamsoft TWAIN Products

Some Visual Studio 2005 users get the error message "Failed to import the ActiveX control. Please ensure it is properly registered" when they try dragging the control from the tool box into the form.

This is a bug of VS2005 that has been reported to Microsoft. The cause of the problem is the missing of the "Interop.DYNAMICTWAINCTRLLib.dll" file or the "AxInterop.DYNAMICTWAINCTRLLib.dll" file that should be created automatically by system when you add the control to the form.

To work around this problem temporarily, you can manually create these two files by using AxImp.exe with source code generation. You can use a command like:

The following code shows the importing of the DWT ActiveX control in command line:

And you can see the output as follows:


The "DYNAMICWEBTWAINCTRLLib.dll" file is the same as the "Interop.DYNAMICTWAINCTRLLib.dll" file while the "AxDYNAMICWEBTWAINCTRLLib.dll" is the same as the "AxInterop.DYNAMICTWAINCTRLLib.dll" file.

Then place these two files into the subdirectory "\obj\Debug" of your project.

After the above work is done, the ActiveX control can be used normally.

Thanks.

There is another way that can create the 2 DLL files easily:

1. Drag the Dynamic Web Twain control from the toolbox to the form and the "Failed to import the ActiveX control. Please ensure it is properly registered." error occurs.
2. Select "Build -> Rebuild Solution" to rebuild the project.
3. Drag the Dynamic Web Twain control from the toolbox to the form for the 2nd time and the "Failed to import the ActiveX control. Please ensure it is properly registered." error occurs again.
4. Select "Build -> Rebuild Solution" to rebuild the project for the 2nd time.
5. Drag the Dynamic Web Twain control from the toolbox to the form for the 3rd time and the ActiveX control will be successfully imported this time.

Thanks.