| 1 | unit JAWSCommon;
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| 2 |
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| 3 | interface
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| 4 |
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| 5 | uses
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| 6 | SysUtils, Windows, Messages, Registry, StrUtils;
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| 7 |
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| 8 | const
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| 9 | DLL_MESSAGE_ID_NAME: PChar = 'VA 508 / Freedom Scientific - JAWS Communication Message ID';
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| 10 |
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| 11 | DISPATCHER_WINDOW_CLASS = 'TfrmVA508JawsDispatcherHiddenWindow';
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| 12 | DISPATCHER_WINDOW_TITLE = 'VA 508 JAWS Dispatcher Window';
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| 13 | DISPATCHER_WINDOW_TITLE_LEN = length(DISPATCHER_WINDOW_TITLE);
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| 14 |
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| 15 | DLL_MAIN_WINDOW_CLASS = 'TfrmVA508HiddenJawsMainWindow';
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| 16 | DLL_WINDOW_TITLE = 'VA 508 JAWS Window';
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| 17 | DLL_WINDOW_TITLE_LEN = length(DLL_WINDOW_TITLE);
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| 18 |
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| 19 | // format = prefix : varname : <index #> : +/- <data>
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| 20 | DLL_WINDOW_DELIM = ':';
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| 21 | DLL_WINDOW_OFFSET = '=';
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| 22 | DLL_WINDOW_LENGTH = ',';
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| 23 |
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| 24 | DLL_CAPTION_MAX = 4090; // max num of chars per title
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| 25 | MAX_CHARS_IN_WINDOW_HANDLE = 12;
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| 26 | DLL_CAPTION_LIMIT = DLL_CAPTION_MAX - MAX_CHARS_IN_WINDOW_HANDLE;
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| 27 |
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| 28 | DLL_DATA_WINDOW_CLASS = 'TfrmVA508HiddenJawsDataWindow';
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| 29 |
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| 30 | JAWS_MESSAGE_GET_DLL_WITH_FOCUS = 1;
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| 31 |
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| 32 | var
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| 33 | MessageID: UINT = 0;
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| 34 |
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| 35 | procedure ErrorCheckClassName(obj: TObject; ClassName: string);
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| 36 | procedure SendReturnValue(Window: HWND; Value: Longint);
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| 37 |
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| 38 | implementation
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| 39 |
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| 40 | uses VAUtils;
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| 41 |
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| 42 | procedure ErrorCheckClassName(obj: TObject; ClassName: string);
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| 43 | begin
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| 44 | if obj.ClassName <> ClassName then
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| 45 | Raise Exception.Create(obj.ClassName + ' should have been ' + ClassName);
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| 46 | end;
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| 47 |
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| 48 | procedure SendReturnValue(Window: HWND; Value: Longint);
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| 49 | var
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| 50 | idx1, idx2: integer;
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| 51 | header: string;
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| 52 | bump: byte;
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| 53 | begin
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| 54 | header := GetWindowTitle(Window);
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| 55 | idx1 := pos(':', header);
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| 56 | if idx1 < 1 then
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| 57 | idx1 := length(header) + 1;
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| 58 | idx2 := posex(':', header, idx1+1);
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| 59 | if idx2<=idx1 then
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| 60 | idx2 := idx1+1;
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| 61 | bump := StrToIntDef(copy(header, idx1+1, idx2 - idx1 - 1), 0);
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| 62 | if bump > 254 then
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| 63 | bump := 1
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| 64 | else
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| 65 | inc(bump);
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| 66 | header := copy(header,1,idx1-1) + ':' + inttostr(bump) + ':' + IntToStr(Value);
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| 67 | SetWindowText(Window, PChar(header));
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| 68 | end;
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| 69 |
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| 70 | procedure InitializeCommonData;
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| 71 | begin
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| 72 | MessageID := RegisterWindowMessage(DLL_MESSAGE_ID_NAME);
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| 73 | end;
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| 74 |
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| 75 | initialization
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| 76 | InitializeCommonData;
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| 77 |
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| 78 | finalization
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| 79 |
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| 80 | end.
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