Closed zongkaili closed 2 years ago
Have you tried calling DTWAIN_SetDeviceNotifications? See also DTWAIN_IsDeviceEventSupported
Also, given the above, the DTWAIN_TN_DEVICEEVENT is the notification you should be handling. However, this will only be successful if:
a) the device supports device events,
b) the device properly detects a paper jam and generates the correct error message
c) sends in the TWAIN message pump a MSG_DEVICEEVENT message that DTWAIN will process, and thus relay this in a
DTWAIN_TN_DEVICEEVENT notification.
Unfortunately I do not have the scanners you mentioned to verify if it can actually return the error codes that you mentioned. This is basically what you need to verify. Note that a lot of this depends on the driver behaving correctly, and DTWAIN has no control over drivers that may do things differently, incorrectly, or not all.
Closing issue
Hi, can i get the real error details when an error which like paper jam occurs ?
scanner : Canon DR-6030C TWAIN and HUAGOSCAN G400 TWAIN
LRESULT CALLBACK TwainCallbackProc(WPARAM wParam, LPARAM lParam, LONG_PTR UserData)
For example,I set the callback as above by calling DTWAIN_SetCallback , I want to get the lParam 'TWAIN_ERR_FEEDERJAMMED' when paper jam, but wParam is 1038, lParam is -1109 and -1023 which is not the real error code.
What can I do to get the actual error code ? please.