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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.
| Member | Description | |
| uStructSize | Size of this structure in bytes, for versioning. Use the sizeof() macro to calculate this value. | |
| TransferMode | Specifies the transfer mode. For possible values, refer to the TWAIN_TRANSFER_MODES enumeration. | |
| szFileName | Character string that contains the file name to transfer if the TransferMode is set to TWAIN_TRANSFER_FILE flag. | |
| uFileFormat | The file format to transfer if the TransferMode is set to TWAIN_TRANSFER_FILE flag. Possible values are (according to the TWAIN 1.9 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 | Multi-page tiff file format. | |
| TWFF_PNG | PNG file. | |
| TWFF_SPIFF | SPIFF file. | |
| TWFF_EXIF | EXIF file. | |
| uCompType | The compression type to be used if the TransferMode is set to TWAIN_TRANSFER_MEMORY flag. Possible values are (according to the TWAIN 1.9 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.