Re: Re: Error in setting ICAP_BITDEPTHREDUCTION

[albertmaxim]

@albertmaxim wrote:

Hi,

I am able to set the capability ICAP_BITDEPTHREDUCTION when using the scanner like HP Commericial Scanjet 5590 Twain
and Hp PSC1410 All-in-one series. But when using Canon scanner canoscan LIDE70, i am not able to set the capability ICAP_BITDEPTHREDUCTION

I am getting the error while setting the Mode [mode is either black & white or gray scale or color].
Please find the sample piece of code to set mode for the selected source / scanner.

BOOL ret_value = FALSE;
TW_CAPABILITY twCapability;
TW_UINT32 NumberOfItems;
pTW_ENUMERATION pvalEnum;
twCapability.Cap = ICAP_PIXELTYPE;
twCapability.ConType = TWON_ENUMERATION;//TWON_ONEVALUE, TWON_RANGE, TWON_ENUMERATION or TWON_ARRAY
NumberOfItems = 1;
twCapability.hContainer = GlobalAlloc(GHND,(sizeof(TW_ENUMERATION) + sizeof(TW_UINT16) * (NumberOfItems)));
if(twCapability.hContainer)
{
pvalEnum = (pTW_ENUMERATION)GlobalLock(twCapability.hContainer);
pvalEnum->NumItems = (TW_UINT32)NumberOfItems;
pvalEnum->ItemType = TWTY_UINT16;
pvalEnum->ItemList[0] = TWPT_BW;
pvalEnum->CurrentIndex = 0;
pvalEnum->DefaultIndex = TWON_DONTCARE32;
GlobalUnlock(twCapability.hContainer);
ret_value=SetCapability(twCapability);
GlobalFree(twCapability.hContainer);

if(ret_value)
{
twCapability.Cap = ICAP_BITDEPTHREDUCTION;
twCapability.ConType = TWON_ONEVALUE;
pTW_ONEVALUE pVal;

twCapability.hContainer = GlobalAlloc(GHND,sizeof(TW_ONEVALUE));
if(twCapability.hContainer)
{
pVal = (pTW_ONEVALUE)GlobalLock(twCapability.hContainer);
pVal->ItemType = TWTY_UINT16;
pVal->Item = TWBR_THRESHOLD;
GlobalUnlock(twCapability.hContainer);
ret_value = SetCapability(twCapability);
GlobalFree(twCapability.hContainer);
}
return ret_value;
}
}//end of if (twCap.hContainer)

Please provide me a solution for this error.