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Can you run the scanning process in a separate thread ? In Win32 each thread has its own message queue, so the rest of your app should remain responsive to the user and TWAIN will block only that one queue.<br />

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Can you run the scanning process in a separate thread ? In Win32 each thread has its own message queue, so the rest of your app should remain responsive to the user and TWAIN will block only that one queue.


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Look for &quot;CWinThread&quot; and &quot;Multithreading: Creating Worker Threads&quot; on the help.<br />

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Look for "CWinThread" and "Multithreading: Creating Worker Threads" on the help.


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My current project involves implementing imaging functionality inside a .dll. &nbsp;I have used TWAIN for the imaging and gotten pretty used to it. &nbsp;However, the project also requires that functions be done asynchronously (ie. done in the background). &nbsp;TWAIN requires a message hook but since this is a dll module, the program 'steals' the app's message queue blocking all messages until the scan is finished.<br />
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Are there any other possible approaches here? &nbsp;(Others suggested that I create a separate .exe that is launched by the .dll, but I think that is way too complicated, for me, at least).<br />

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My current project involves implementing imaging functionality inside a .dll.  I have used TWAIN for the imaging and gotten pretty used to it.  However, the project also requires that functions be done asynchronously (ie. done in the background).  TWAIN requires a message hook but since this is a dll module, the program 'steals' the app's message queue blocking all messages until the scan is finished.

Are there any other possible approaches here?  (Others suggested that I create a separate .exe that is launched by the .dll, but I think that is way too complicated, for me, at least).


Asynchronous Functions

Kernel and system programming is the process of creating the software necessary for a computer or device to function and operate other programs. Some operating systems (such as Microsoft Windows) are proprietary, but others, such as the various Linux distributions, are open source.