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xcall AUI, AUI_IMAGE, IMGOP_TWERR, handle, status

IMGOP_TWERR only applies when the status returned from another opcode is 11 (TWAIN error). In that case, you can use opcode 9 to retrieve a more specific error code, among the following:

Value

Meaning

1

Failure due to unknown causes

2

Not enough memory to perform operation

3

No data source

4

Source already in use

5

Source/Manager error already reported

6

Unknown capability requested

7

Undefined error

8

Undefined error

9

Bad protocol

10

Parameter out of range

11

Message received out of sequence

12

Unknown destination source app

13

Could not create parent window

14

TWAIN Source Manager not found

 

 

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