This topic and its replies were posted before the current version of LEADTOOLS was released and may no longer be applicable.
#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?
#2
Posted
:
Tuesday, August 9, 2005 2:13:38 PM(UTC)
Groups: Manager, Tech Support
Posts: 367
Was thanked: 1 time(s) in 1 post(s)
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++:
HTWAINSESSION hSession;
APPLICATIONDATA AppData;
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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