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typedef struct _tagTransferOptions{L_UINT uStructSize;TWAIN_TRANSFER_MODES TransferMode;L_TCHAR szFileName[L_MAX_PATH];L_UINT uFileFormat;L_UINT uCompType;} TRANSFEROPTIONS, * pTRANSFEROPTIONS;
The TRANSFEROPTIONS structure provides information about transfer options to be used when acquiring an image.
Size of this structure in bytes, for versioning. Use the sizeof() operator to calculate this value.
Specifies the transfer mode. For possible values, refer to the TWAIN_TRANSFER_MODES enumeration.
Character string that contains the file name to transfer if the TransferMode is set to TWAIN_TRANSFER_FILE flag.
The file format to transfer if the TransferMode is set to TWAIN_TRANSFER_FILE flag. Possible values are (according to the TWAIN specification):
| Value | Meaning |
|---|---|
| TWFF_TIFF | Tagged image file. |
| TWFF_PICT | Macintosh PICT. |
| TWFF_BMP | Windows regular bitmap. |
| TWFF_XBM | X-Windows bitmap. |
| TWFF_JFIF | JPEG file interchange format. |
| TWFF_FPX | Flash pix file. |
| TWFF_TIFFMULTI | Multipage tiff file format. |
| TWFF_PNG | PNG file. |
| TWFF_SPIFF | SPIFF file. |
| TWFF_EXIF | EXIF file. |
The compression type to be used if the TransferMode is set to TWAIN_TRANSFER_MEMORY flag. Possible values are (according to the TWAIN specification):
| Value | Meaning |
|---|---|
| TWCP_NONE | No compression is to be used. |
| TWCP_PACKBITS | Pack Bits compression. |
| TWCP_GROUP31D | CCITT Group 3 compression with no End of Line. |
| TWCP_GROUP31DEOL | CCITT Group 3 compression with End of Line. |
| TWCP_GROUP32D | CCITT Group 3 compression (use cap for K Factor). |
| TWCP_GROUP4 | CCITT Group 4 compression. |
| TWCP_JPEG | JPEG compression. |
| TWCP_LZW | LZW compression (like gifs). |
| TWCP_JBIG | JBIG compression, used mostly for bitonal images. |
| TWCP_PNG | PNG compressed. |
| TWCP_RLE4 | RLE4 compression. |
| TWCP_RLE8 | RLE8 compression. |
| TWCP_BITFIELDS | Bit Fields compression. |
pTRANSFEROPTIONS is a pointer to a TRANSFEROPTIONS structure. Where the function parameter type is pTRANSFEROPTIONS, you can declare a TRANSFEROPTIONS variable, update the structure's fields, and pass the variable's address in the parameter. Declaring a pTRANSFEROPTIONS variable is necessary only if your program requires a pointer.
TRANSFEROPTIONS is used with the L_TwainSetTransferOptions and L_TwainGetTransferOptions functions.