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Error Connecting to a scanner

Forums › TWAIN Specification › TWAIN Specification Discussion › Error Connecting to a scanner

  • This topic has 2 replies, 1 voice, and was last updated 3 years, 1 month ago by Nuno Rodrigues.
Viewing 3 posts - 1 through 3 (of 3 total)
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  • November 23, 2017 at 1:57 pm #30727 Reply
    Nuno Rodrigues
    • Topics - 93
    • Replies - 185
    • Total Posts - 278

    Hi, i need some help.

    I’m trying to build an app based on Twain.dll and i’m getting this error “Unhandled exception at 0x077F0C90 (HPScanUI.dll) in Twack_32.exe: 0xC0000005: Access violation reading location 0x00000004”.

    To emulate my error you could download the twacker-32 from .
    Select a source that is not connected to your PC. Click File>Select Source… “Choose one that is not connected to your PC”
    Open the Source Manager. Click Special>1 Load/Open SM.
    Try to open the source. Click Special>2 Open Source.
    After a while it gives the error saying the source is not connected. Expected.
    Close the source manager. Click Special>Close/Unload SM.
    Now let’s try to open another source(has to be a different one), one that is connected to the PC.
    Select the diferent source. Click File>Select Source… “Chouse one that is connected to the PC”.
    Open the Source Manager. Click Special>1 Load/Open SM.
    Try to open the source. Click Special>2 Open Source.
    This is where i get my error.
    In the case of the twacker-32 the app breaks, you can debug it in the Visual Studio.
    And Here it is my error, YOu can se a print scren of it here .

    Can anyone help me?

    November 23, 2017 at 1:59 pm #30728 Reply
    Nuno Rodrigues
    • Topics - 93
    • Replies - 185
    • Total Posts - 278

    Error

    November 23, 2017 at 2:01 pm #30729 Reply
    Nuno Rodrigues
    • Topics - 93
    • Replies - 185
    • Total Posts - 278

    Here you have a link to a print screen of the error.

    http://prntscr.com/hed7sn

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Viewing 3 posts - 1 through 3 (of 3 total)
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