Re: TWAIN Scanning - Acquire Problem ?

Hi all,

I am facing a problem with TWAIN Scanning,

I am using Leadtools 14 with VB6 for my application :

I am acquiring an Image to Memory Mode, and using L_LTWAIN_BUFFER_MODE to Acquire method as :

 intRet = ImgTwain.Acquire(L_LTWAIN_BUFFER_MODE)

The problem is with RasterTwains Acquire method that while calling the Acquire method the Image get scanned and immediately an error occured saying  -

"Synchronous call of ReadImageData failed due to exception. Attempted to read/write protected memory. This is often an indication that the memory is corrupt."

Can someone tell me what is going wrong as the acquisition and transfer of image data done by the Acquire method ?

Or How I am able to conclude transfer of scanned image ?

Can I get any Memory Acquisition example ?

Hello,

I checked this issue on my side and didn't notice the problem.

What is the build number (version info) of the LEADTOOLS v14 DLLS (such as LTRTN14n.dll, LTRTW14N.DLL and ltkrn14n.dll) that you use?

Thanks,
Maen Badwan
LEADTOOLS Technical Support

Hi Maen,

First of all thank you for the instant reply ,

The build nos for dlls are :

ltkrn14n.dll - 14.5.0.2

LTRTN14N.DLL - 14.5.0.2

LTRTW14N.DLL - 14.5.0.10

lttwn14n.dll - 14.5.0.10

 

If all things are correct by your terms then can you send me some example of acquiring and transferring image into memory mode.

I am not using TWAIN Sources UI, firstly I tried using L_LTWAIN_USE_THREAD_MODE with Acquire method but not get result. so now I switched my flag to L_LTWAIN_BUFFER_MODE.

One more thing to specify is after this error if I execute this Acquire method line again for one or two instances then the Image get transfered and the AcquirePageEvent gets executed.

This is cetainly a very mischievous behaviour and cant guess exactly what is happening,

Please guide me on this issue.

Thanks again.

 

Hello,

You are using a pretty old version of LEADTOOLS 14.5 DLLs.

To obtain the latest LEADTOOLS v14.5 patches, please send your LEADTOOLS v14.5 serial number to support@leadtools.com and ask for the latest patches and mention this forum post.

Thanks,
Maen Badwan
LEADTOOLS Technical Support

Hi there,

Now I have updated my dll files as follows

ltkrn14n.dll - 14.5.0.2

LTRTN14N.DLL - 14.5.0.57

LTRTW14N.DLL - Not In Use

lttwn14n.dll - Not In Use

Sample is attached herewith for your reference

I rechecked the same issue using your sample project and the problem is not active.

Please try the same issue using the latest LEADTOOLS v14.5 patches.

To obtain the latest LEADTOOLS v14.5 patches, please send your LEADTOOLS v14.5 serial number to support@leadtools.com and ask for the latest patches. Please don't forget to mention this forum post in your email to support.

Thanks,
Maen Badwan
LEADTOOLS Technical Support

I am acquiring an image in buffered memory mode.

TWAIN Drivers developer advised me to increase buffer size before acquiring image.

How should I increase buffer size using LEAD Tools Twain Toolkit ?

Do you have any sample which demonstrates TWAIN image acquisition in Buffered Memory Mode ?

In order to change the buffer size you must use the Fast Twain interface (Twain.TwainFastConfiguration.BufferSize). This property is utilized in our Fast Twain Demo. To see it, load up the demo and click on the Twain Menu. From there, click Fast Twain. Select Memory Mode and enable the custom buffer size.