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   1 Requirements to be a TWAIN-Compliant Source
   2 Requirements
   3 TWAIN-compliant Sources must support the following:
   4 Operations
   5 ----------
   6 DG_CONTROL / DAT_CAPABILITY / MSG_GET
   7 DG_CONTROL / DAT_CAPABILITY / MSG_GETCURRENT
   8 DG_CONTROL / DAT_CAPABILITY / MSG_GETDEFAULT
   9 DG_CONTROL / DAT_CAPABILITY / MSG_RESET
  10 DG_CONTROL / DAT_CAPABILITY / MSG_SET
  11 DG_CONTROL / DAT_EVENT / MSG_PROCESSEVENT
  12 DG_CONTROL / DAT_IDENTITY / MSG_GET
  13 DG_CONTROL / DAT_IDENTITY / MSG_OPENDS
  14 DG_CONTROL / DAT_IDENTITY / MSG_CLOSEDS
  15 DG_CONTROL / DAT_PENDINGXFERS / MSG_ENDXFER
  16 DG_CONTROL / DAT_PENDINGXFERS / MSG_GET
  17 DG_CONTROL / DAT_PENDINGXFERS / MSG_RESET
  18 DG_CONTROL / DAT_SETUPMEMXFER / MSG_GET
  19 DG_CONTROL / DAT_STATUS / MSG_GET
  20 DG_CONTROL / DAT_USERINTERFACE / MSG_DISABLEDS
  21 DG_CONTROL / DAT_USERINTERFACE / MSG_ENABLEDS
  22 DG_CONTROL / DAT_XFERGROUP / MSG_GET
  23 DG_IMAGE / DAT_IMAGEINFO / MSG_GET
  24 DG_IMAGE / DAT_IMAGELAYOUT / MSG_GET
  25 DG_IMAGE / DAT_IMAGELAYOUT / MSG_GETDEFAULT
  26 DG_IMAGE / DAT_IMAGELAYOUT / MSG_RESET
  27 DG_IMAGE / DAT_IMAGELAYOUT / MSG_SET
  28 DG_IMAGE / DAT_IMAGEMEMXFER / MSG_GET
  29 DG_IMAGE / DAT_IMAGENATIVEXFER / MSG_GET
  30
  31 Capabilities
  32 ------------
  33 Every Source must support all five DG_CONTROL / DAT_CAPABILITY operations on:
  34 CAP_XFERCOUNT
  35 Every Source must support DG_CONTROL / DAT_CAPABILITY MSG_GET on:
  36 CAP_SUPPORTEDCAPS
  37 CAP_UICONTROLLABLE
  38 Sources that supply image information must support DG_CONTROL / DAT_CAPABILITY /
  39 MSG_GET, MSG_GETCURRENT, MSG_GETDEFAULT on:
  40 ICAP_COMPRESSION
  41 ICAP_PLANARCHUNKY
  42 ICAP_PHYSICALHEIGHT
  43 ICAP_PHYSICALWIDTH
  44 ICAP_PIXELFLAVOR
  45 Sources that supply image information must support DG_CONTROL / DAT_CAPABILITY /
  46 MSG_GET, MSG_GETCURRENT, MSG_GETDEFAULT, MSG_RESET and MSG_SET on:
  47 ICAP_BITDEPTH
  48 ICAP_BITORDER
  49 ICAP_PIXELTYPE
  50 ICAP_UNITS
  51 ICAP_XFERMECH
  52 ICAP_XRESOLUTION
  53 ICAP_YRESOLUTION
  54 All Sources must implement the advertised features supported by their devices. They must
  55 make these features available to applications via the TWAIN protocol. For example, a Source
  56 thats connected to a device that has an ADF must support DG_CONTROL /
  57 DAT_CAPABILITY / MSG_GET, MSG_GETCURRENT, MSG_GETDEFAULT on:
  58 CAP_FEEDERENABLED
  59 CAP_FEEDERLOADED
  60 and DG_CONTROL / DAT_CAPABILITY / MSG_GET, MSG_GETCURRENT,
  61 MSG_GETDEFAULT, MSG_RESET and MSG_SET on:
  62 CAP_AUTOFEED
  63 If the ADF also supports ejecting and rewinding of pages then the Source should also support
  64 DG_CONTROL / DAT_CAPABILITY / MSG_GET, MSG_GETCURRENT,
  65 MSG_GETDEFAULT, MSG_RESET and MSG_SET on:
  66 CAP_CLEARPAGE
  67 CAP_REWINDPAGE
  68
  69
  70 *******************************************************************************
  71
  72 From Application to Source Manager (Control Information)
  73
  74 Data Group              Data Argument Type      Message
  75 DG_CONTROL              DAT_IDENTITY            MSG_CLOSEDS
  76                                                 MSG_GETDEFAULT
  77                                                 MSG_GETFIRST
  78                                                 MSG_GETNEXT
  79                                                 MSG_OPENDS
  80                                                 MSG_USERSELECT
  81 DG_CONTROL              DAT_PARENT              MSG_CLOSEDSM
  82                                                 MSG_OPENDSM
  83 DG_CONTROL              DAT_STATUS              MSG_GET
  84
  85 From Application to Source (Control Information)
  86 Data Group              Data Argument Type      Message
  87 DG_CONTROL              DAT_CAPABILITY          MSG_GET
  88                                                 MSG_GETCURRENT
  89                                                 MSG_GETDEFAULT
  90                                                 MSG_QUERYSUPPORT
  91                                                 MSG_RESET
  92                                                 MSG_SET
  93 DG_CONTROL              DAT_CUSTOMDSDATA        MSG_GET
  94                                                 MSG_SET
  95 DG_CONTROL              DAT_FILESYSTEM          MSG_AUTOMATICCAPTURE
  96                                                 DIRECTORY
  97                                                 MSG_CHANGEDIRECTORY
  98                                                 MSG_COPY
  99                                                 MSG_CREATEDIRECTORY
 100                                                 MSG_DELETE
 101                                                 MSG_FORMATMEDIA
 102                                                 MSG_GETCLOSE
 103                                                 MSG_GETFIRSTFILE
 104                                                 MSG_GETINFO
 105                                                 MSG_GETNEXTFILE
 106                                                 MSG_RENAME
 107 DG_CONTROL              DAT_EVENT               MSG_PROCESSEVENT
 108 DG_CONTROL              DAT_PASSTHRU            MSG_PASSTHRU
 109 DG_CONTROL              DAT_PENDINGXFERS        MSG_ENDXFER
 110                                                 MSG_GET
 111                                                 MSG_RESET
 112                                                 MSG_STOPFEEDER
 113 DG_CONTROL              DAT_SETUPFILEXFER       MSG_GET
 114                                                 MSG_GETDEFAULT
 115                                                 MSG_RESET
 116                                                 MSG_SET
 117 DG_CONTROL              DAT_SETUPFILEXFER2      MSG_GET
 118                                                 MSG_GETDEFAULT
 119                                                 MSG_RESET
 120                                                 MSG_SET
 121 DG_CONTROL              DAT_SETUPMEMXFER        MSG_GET
 122 DG_CONTROL              DAT_STATUS              MSG_GET
 123 DG_CONTROL              DAT_USERINTERFACE       MSG_DISABLEDS
 124                                                 MSG_ENABLEDS
 125                                                 MSG_ENABLEDSUIONLY
 126 DG_CONTROL              DAT_XFERGROUP           MSG_GET
 127                                                 MSG_SET
 128
 129 From Application to Source (Image Information)
 130 Data Group              Data Argument Type      Message
 131 DG_IMAGE                DAT_CIECOLOR            MSG_GET
 132 DG_IMAGE                DAT_EXTIMAGEINFO        MSG_GET
 133 DG_IMAGE                DAT_GRAYRESPONSE        MSG_RESET
 134                                                 MSG_SET
 135 DG_IMAGE                DAT_IMAGEFILEXFER       MSG_GET
 136 DG_IMAGE                DAT_IMAGEINFO           MSG_GET
 137 DG_IMAGE                DAT_IMAGELAYOUT         MSG_GET
 138                                                 MSG_GETDEFAULT
 139                                                 MSG_RESET
 140                                                 MSG_SET
 141 DG_IMAGE                DAT_IMAGEMEMXFER        MSG_GET
 142 DG_IMAGE                DAT_IMAGENATIVEXFER     MSG_GET
 143 DG_IMAGE                DAT_JPEGCOMPRESSION     MSG_GET
 144                                                 MSG_GETDEFAULT
 145                                                 MSG_RESET
 146                                                 MSG_SET
 147 DG_IMAGE                DAT_PALETTE8            MSG_GET
 148                                                 MSG_GETDEFAULT
 149                                                 MSG_RESET
 150                                                 MSG_SET
 151 DG_IMAGE                DAT_RGBRESPONSE         MSG_RESET
 152                                                 MSG_SET
 153
 154 From Application to Source (Audio Information)
 155 Data Group              Data Argument Type      Message
 156 DG_AUDIO                DAT_AUDIOFILEXFER       MSG_GET
 157 DG_AUDIO                DAT_AUDIOINFO           MSG_GET
 158 DG_AUDIO                DAT_AUDIONATIVEXFER     MSG_GET
 159
 160 From Source Manager to Source (Control Information)
 161 Data Group              Data Argument Type      Message
 162 DG_CONTROL              DAT_IDENTITY            MSG_CLOSEDS
 163                                                 MSG_GET
 164                                                 MSG_OPENDS
 165
 166 From Source to Application (Control Information via the Source Manager)
 167 (Used by Windows Sources only)
 168 Data Group              Data Argument Type      Message
 169 DG_CONTROL              DAT_NULL                MSG_CLOSEDSOK
 170                                                 MSG_CLOSEDSREQ
 171                                                 MSG_DEVICEEVENT
 172                                                 MSG_XFERREADY