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 MIO->SelectedAcquireSource and Access violation		  New Topic  Reply to Topic
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graph_man

328 Posts
Posted - Jun 09 2017 :  08:18:04  Show Profile  Reply
void __fastcall TAFTV_FormMain::Scanner1Click(TObject *Sender)
{
TIEAcquireSource MyAcquireSource;
TIEAcquireApis AcquireApis = TIEAcquireApis() << ieaTwain << ieaWIA;

if (ImageEnMViewScan->MIO->SelectAcquireSource(AcquireApis))
{
MyAcquireSource = ImageEnMViewScan->MIO->SelectedAcquireSource;
AcquireSourceName = MyAcquireSource.Name;
}
}

What is reason and how to fix?

ps
I use the latest version of ImageEn

xequte

38615 Posts
Posted - Jun 10 2017 :  01:21:38  Show Profile  Reply
Hi

On which line does the A/V occur? Does changing the API selection affect it?



Nigel
Xequte Software
www.xequte.com
nigel@xequte.com
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graph_man

328 Posts
Posted - Jun 10 2017 :  10:27:47  Show Profile  Reply
> On which line does the A/V occur?

This line:
MyAcquireSource = ImageEnMViewScan->MIO->SelectedAcquireSource;

> Does changing the API selection affect it?

Yes
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xequte

38615 Posts
Posted - Jun 11 2017 :  19:31:24  Show Profile  Reply
>> Does changing the API selection affect it?
>
> Yes

So, which raises the error, ieaWIA or ieaTwain?

Does this issue occur even with the AllAcquire demo in Demos\ImageAcquisition\AllAcquire\?

Nigel
Xequte Software
www.xequte.com
nigel@xequte.com
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graph_man

328 Posts
Posted - Jun 12 2017 :  03:55:29  Show Profile  Reply
> So, which raises the error, ieaWIA or ieaTwain?

Both

Does this issue occur even with the AllAcquire demo in Demos\ImageAcquisition\AllAcquire\?

Does not
Because in the demo there isn't string:
ImageEnMViewScan->MIO->SelectedAcquireSource
after
SelectAcquireSource
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xequte

38615 Posts
Posted - Jun 12 2017 :  17:48:16  Show Profile  Reply
Hi

Yes, it is in the demo if you click "Save Parameters". Does that also cause the error?

You might want to try stepping into the SelectedAcquireSource code to see where the error is occuring.

Nigel
Xequte Software
www.xequte.com
nigel@xequte.com
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graph_man

328 Posts
Posted - Jun 12 2017 :  18:05:19  Show Profile  Reply
> Yes, it is in the demo if you click "Save Parameters". Does that also cause the error?

NO

> You might want to try stepping into the SelectedAcquireSource code to see where the error is occuring.

How to do that?
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xequte

38615 Posts
Posted - Jun 12 2017 :  20:11:52  Show Profile  Reply
Hi

Presumably there is an issue in your application. Please create a very simple demo that reproduces the error.

Nigel
Xequte Software
www.xequte.com
nigel@xequte.com
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