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Sets or restores JPEG compression options for the specified TWAIN session.
#include "lttwn.h"
L_LTTWN_API L_INT L_TwainSetJPEGCompression(hSession, pTwJpegComp, uFlag)
Handle to an existing TWAIN session. This handle is obtained by calling the L_TwainInitSession or L_TwainInitSession2 function.
Pointer to a TW_JPEGCOMPRESSION structure that references the JPEG compression options.
Flag that indicates whether to set new or restore default JPEG compression options. Possible values are:
| Value | Meaning |
|---|---|
| LTWAIN_SET_JPEG_COMPRESSION | [0x0001] Set new JPEG compression options |
| LTWAIN_RESET_JPEG_COMPRESSION | [0x0002] Restore default JPEG compression options |
| Value | Meaning |
|---|---|
| SUCCESS | The function was successful. |
| < 1 | An error occurred. Refer to Return Codes. |
Depending upon the flag used, this function will either set JPEG compression options for the specified TWAIN session, or restore the default JPEG compression options for the specified TWAIN session. For more information about TW_JPEGCOMPRESSION, refer to the TWAIN specification.
This function must be called after calling the L_TwainStartCapsNeg function and before calling the L_TwainEndCapsNeg function.
For an example, refer to L_TwainGetJPEGCompression.