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DTWAIN Handles and Threading Issues |
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Internally, DTWAIN associates the handle returned by DTWAIN_SysInitialize or DTWAIN_SysInitializeEx with the current thread identifier (thread ID). When a subsequent call to a DTWAIN API function is done, DTWAIN checks that the thread identifier originally used in DTWAIN_SysInitialize is still the current thread. If not, a -1001 error (DTWAIN not initialized) is returned.
Therefore under normal circumstances, DTWAIN will not run across threads without some modifications, which are discussed below.
To overcome the -1001 error when using multiple threads, there are two scenarios possible:
In the following sections, references to DTWAIN_SysInitialize also apply to DTWAIN_SysInitializeEx.
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