sane.ds: Return a 0 for MSG_QUERYSUPPORT even for capabilities we don't support.

22bab0aa · Jeremy White · Alexandre Julliard · 8dee7519 · 22bab0aa
Commit 22bab0aa authored Feb 09, 2009 by Jeremy White Committed by Alexandre Julliard Feb 10, 2009
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capability.c dlls/sane.ds/capability.c +5 -0

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--- a/dlls/sane.ds/capability.c
+++ b/dlls/sane.ds/capability.c
@@ -259,5 +259,10 @@ TW_UINT16 SANE_SaneCapability (pTW_CAPABILITY pCapability, TW_UINT16 action)
            break;
    }

+    /* Twain specifies that you should return a 0 in response to QUERYSUPPORT,
+     *   even if you don't formally support the capability */
+    if (twCC == TWCC_CAPUNSUPPORTED && action == MSG_QUERYSUPPORT)
+        twCC = set_onevalue(pCapability, 0, TWTY_INT32);
+
    return twCC;
 }