References ▼
#include "lttwn.h"
L_LTTWN_API L_INT L_TwainSetRGBResponse(hSession, pRgbResponse, nBitsPerPixel, uFlag)
Sets the RGB elements used when transferring data from the current TWAIN source.
Handle to an existing TWAIN session. This handle is obtained by calling the L_TwainInitSession or L_TwainInitSession2 function.
Pointer to a TW_RGBRESPONSE structure that references the RGB elements to be set for the TWAIN source. For more information about TW_RGBRESPONSE, refer to the TWAIN specification.
Bits per pixel to be set. This is used to determine the number of RGB elements in the TW_RGBRESPONSE structure.
Flags that indicate whether to set or reset the RGB elements for the TWAIN source. Possible values are:
| Value | Meaning |
|---|---|
| TWAIN_RGB_RESPONSE_SET | [0x0001] Set the RGB elements for the current TWAIN source using the information provided. |
| TWAIN_RGB_RESPONSE_RESET | [0x0002] Reset the RGB elements for the current TWAIN source to the default values. Please note that defaults vary from TWAIN source to TWAIN source. |
| Value | Meaning |
|---|---|
| SUCCESS | The function was successful. |
| < 1 | An error occurred. Refer to Return Codes. |
This function should be called after calling the L_TwainStartCapsNeg function and before calling the L_TwainEndCapsNeg function.
Required DLLs and Libraries
L_INT TwainSetRGBResponseExample(HTWAINSESSION hSession){L_INT nRet;nRet = L_TwainStartCapsNeg (hSession);if(nRet != SUCCESS)return nRet;pTW_RGBRESPONSE pRgbResponse = NULL;pRgbResponse = (pTW_RGBRESPONSE)GlobalAllocPtr(GHND, sizeof(TW_RGBRESPONSE) + sizeof(TW_ELEMENT8) * 2);if (pRgbResponse){pRgbResponse->Response[0].Index = 0;pRgbResponse->Response[0].Channel1 = 0;pRgbResponse->Response[0].Channel2 = 0;pRgbResponse->Response[0].Channel3 = 0;pRgbResponse->Response[1].Index = 1;pRgbResponse->Response[1].Channel1 = 255;pRgbResponse->Response[1].Channel2 = 255;pRgbResponse->Response[1].Channel3 = 255;nRet = L_TwainSetRGBResponse(hSession, pRgbResponse, 1, TWAIN_RGB_RESPONSE_SET);if(nRet != SUCCESS)return nRet;}nRet = L_TwainEndCapsNeg (hSession);if(nRet != SUCCESS)return nRet;return SUCCESS;}