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#1 Posted : Thursday, August 4, 2005 12:14:56 PM(UTC)


Groups: Registered
Posts: 2

I'm trying to use the API from within PowerBuilder and I'm having problems with HTWAINSESSION.  Every time I try and use it in a function I get -13 return.  According to the help file HTWAINSESSION is a HANDLE and PowerBuilder declares a handle as an UnsignedLong.  I create a variable of type UnsignedLong and try and pass it by reference to L_TwainInitSession or any other function that takes that type and I get the -13 return.

Is there anything special about HTWAINSESSION?  What am I doing wrong?


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#2 Posted : Tuesday, August 9, 2005 2:13:38 PM(UTC)


Groups: Manager, Tech Support
Posts: 367

The problem is probably caused by the second parameter, which is of
type APPLICATIONDATA. If you don't pass a valid structure (also by
reference) in the parameter, the function fails. Here's a correct way to do it in C++:

AppData.hWnd = hWnd;
strcpy (AppData.szManufacturerName, "LEAD Technologies, Inc.");
strcpy (AppData.szAppProductFamily, "LEAD Test Applications");
strcpy (AppData.szVersionInfo, "Version 1.0");
strcpy (AppData.szAppName, "TWAIN Test Application");
AppData.uStructSize = sizeof(AppData);

nRet = L_TwainInitSession(&hSession, &AppData);

Note, in the current version of LEADTOOLS, sizeof(AppData) is 808 bytes.

Amin Dodin

LEADTOOLS Technical Support
Amin Dodin

Senior Support Engineer
LEAD Technologies, Inc.
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