#include "lttwn.h"
L_LTTWN_API L_INT L_TwainGetSources (hSession, pfnCallBack, uStructSize, uFlags, pUserData)
Gets the available information for the TWAIN sources installed on the system.
Handle to an existing TWAIN session. This handle is obtained by calling the L_TwainInitSession or L_TwainInitSession2 function.
Callback function for processing each enumerated TWAIN source. Use the function pointer as the value of this parameter.
L_TwainGetSources calls this callback function as it gets each TWAIN source. The callback function must adhere to the function prototype described in LTWAINSOURCEINFOCALLBACK Function.
Size in bytes, of the structure passed to the LTWAINSOURCEINFOCALLBACK callback function, for versioning. Use sizeof(LTWAINSOURCEINFO).
Flags that indicate what sources to get. Possible values are:
Value | Meaning |
---|---|
LTWAIN_SOURCE_ENUMERATE_ALL | [0x0000] Enumerates all the available sources. |
LTWAIN_SOURCE_ENUMERATE_DEFAULT | [0x0001] Gets only the default source (currently selected). |
Void pointer that you can use to pass one or more additional parameters that the callback function needs.
To use this feature, assign a value to a variable or create a structure that contains as many fields as you need. Then, in this parameter, pass the address of the variable or structure, casting it to L_VOID *. The callback function, which receives the address in its own pUserData parameter, can cast it to a pointer of the appropriate data type to access your variable or structure. If the additional parameters are not needed, you can pass NULL in this parameter.
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
! = SUCCESS | An error occurred. Refer to Return Codes. |
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Required DLLs and Libraries
L_INT EXT_CALLBACK TwnSourcesCB(HTWAINSESSION hSession,
pLTWAINSOURCEINFO pSource,
L_VOID * pUserData)
{
UNREFERENCED_PARAMETER(hSession);
UNREFERENCED_PARAMETER(pUserData);
L_TCHAR szBuffer[MAX_PATH];
memset(szBuffer, 0, sizeof(szBuffer));
wsprintf(szBuffer, TEXT("Source Name = %s\nSource Version = %s\nProduct Family = %s\nManufacturer = %s\n"),
pSource->pszTwnSourceName,
(pSource->TwainVersion == TWAIN_VERSION1) ? TEXT("1.0") : TEXT("2.0"),
pSource->pszTwnProductFamily,
pSource->pszTwnManufacturer);
MessageBox(NULL, szBuffer, TEXT("Source Info."), MB_OK);
return TWAIN_SUCCESS;
}
L_INT TwainGetSourcesExample(HTWAINSESSION hSession)
{
L_INT nRet;
nRet = L_TwainGetSources(hSession,
TwnSourcesCB,
sizeof(LTWAINSOURCEINFO),
LTWAIN_SOURCE_ENUMERATE_ALL,
NULL);
if (nRet != SUCCESS)
{
MessageBox (NULL, TEXT("Error During Enumeration Procedure"), TEXT("ERROR"), MB_OK);
return nRet;
}
return SUCCESS;
}