CreateNumericContainerRange example for C++ Builder
void __fastcall TForm1::btnCreateNumericContainerRangeClick(TObject *Sender)
{
TW_CAPABILITY twCap;
FillMemory ( &twCap, sizeof(TW_CAPABILITY), 0 );
twCap.Cap= ICAP_XRESOLUTION;
twCap.ConType= TWON_RANGE;
LEADTwain1->CreateNumericContainerRange ( &twCap, TWAINNUMERICTYPE_TW_FIX32, 100, 600, 100, 200, 300 );
LEADTwain1->SetCapability ( &twCap, LTWAIN_CAPABILITY_SET );
LEADTwain1->FreeContainer ( &twCap );
}