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Date Posted: 18:54:44 03/12/01 Mon
Author: Michel
Subject: Re: Calling TWAIN driver in C++Builder
In reply to: Mike 's message, "Re: Calling TWAIN driver in C++Builder" on 02:56:17 03/07/01 Wed


Hi Mike,

The simplest way is to first load the DibHandle into a TDibGraphic, then copy it to a TBitmap:


Graphic = new TDibGraphic();

Graphic->AssignFromDIBHandle(DibHandle);
Graphic->XDotsPerInch = XDpi;
Graphic->DotsPerInch = YDpi;

Bitmap->Assign(Graphic);

delete Graphic;

Best regards,

Michel

>I do not understand as I am not accustomed to have to
>work with these DIB things. Could you please tell me
>how to convert the DibHandle your Acquire event
>returns to a TBitmap (or copy its contents to a
>TBitmap)?
>
>Also, how can I test if a TWAIN device is present?
>IsConfigured does not return false if no TWAIN device
>is present.
>
>Thanks,
>
>Mike
>
>>
>>Hi Mike,
>>
>>Try Bitmap->Assign(Graphic), where Graphic is any
>class
>>derived from TDibGraphic.
>>
>>Best regards,
>>
>>Michel
>>
>>>Thanks Michel,
>>>
>>>It compiles without errors now. How do I get the
>image
>>>returned by Acquire in a TBitmap (it does not have a
>>>Graphic property)?
>>>
>>>Mike
>>>
>>>>Hi Mike,
>>>>
>>>>You'll find a native CBuilder scan example at:
>>>>
>>>>www.intervalsoftware.com/files/scandemoCB5.zip
>>>>
>>>>Best regards,
>>>>
>>>>Michel
>>>>
>>>>>Hi Michel,
>>>>>Can you give me an example how to call the TWAIN
>>>>>driver in C++Builder? I have been trying to
>>translate
>>>>>your example in the help file to CB but I am doing
>>>>>something wrong with the definition of the event
>>>>>handler.
>>>>>My goal is to get the image scanned in a TBitmap.
>>>>>Thanks,
>>>>>Mike

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