Annotation of libwww/Library/src/HTDialog.html, revision 2.5
2.1 frystyk 1: <HTML>
2: <HEAD>
2.4 frystyk 3: <TITLE>W3C Reference Library libwww messages and dialogs</TITLE>
2.5 ! frystyk 4: <!-- Changed by: Henrik Frystyk Nielsen, 23-Mar-1996 -->
2.1 frystyk 5: <NEXTID N="z11">
6: </HEAD>
7: <BODY>
8:
9: <H1>Application side Error Messages And the like</H1>
10:
11: <PRE>
12: /*
13: ** (c) COPYRIGHT MIT 1995.
14: ** Please first read the full copyright statement in the file COPYRIGH.
15: */
16: </PRE>
17:
18: This module provides some "make life easier" functions in order to get
19: the application going. The functionality of this module was originally
20: in <A HREF="HTAccess.html">HTAccess</A>, but now It is part of the <A
21: HREF="WWWApp.html">application interface</A> which the application
22: <EM>may</EM> use it if desired.<P>
23:
24: This module is implemented by <A HREF="HTHome.c">HTHome.c</A>, and it
25: is a part of the <A HREF="http://www.w3.org/pub/WWW/Library/"> W3C
26: Reference Library</A>. <P>
27:
28: <PRE>
29: #ifndef HTMSG_H
30: #define HTMSG_H
31: #include "WWWLib.h"
32: </PRE>
33:
34: You can register a set of callback functions to handle user prompting,
35: error messages, confimations etc. Here we give a set of functions that
36: can be used on almost anu thinkable platform. If you want to provide
37: your own platform dependent inoplementation then fine :-)
38:
39: <H3>Display a message, then wait for 'YES' or 'NO'</H3>
40:
41: This function prompts the user for a confirmation on the message
42: passed as a parameter. If the user reacts in the affirmative, returns
43: <EM>TRUE</EM>, returns <EM>FALSE</EM> otherwise.
44:
45: <PRE>
46: extern HTAlertCallback HTConfirm;
47: </PRE>
48:
49: <H3>Prompt the User a Question</H3>
50:
51: Prompt for answer and get text back. Reply text is either NULL on
52: error or a dynamic string which the caller must free.
53:
54: <PRE>
55: extern HTAlertCallback HTPrompt;
56: </PRE>
57:
58: <H3>Prompt for a Password</H3>
59:
60: Prompt for password without echoing the reply. Reply text is weither
61: NULL on error or a dynamic string which the caller must free. <P>
62:
63: <B>NOTE:</B> The current version uses <EM>getpass</EM> which on many
64: systems returns a string of 8 or 16 bytes.
65:
66: <PRE>
67: extern HTAlertCallback HTPromptPassword;
68: </PRE>
69:
70: <H3>Prompt for a UserID and a Password</H3>
71:
72: This is just a composite function using <EM>HTPrompt</EM> and
73: <EM>HTPromptPassword</EM>. The strings returned must be freed by
74: caller.
75:
76: <PRE>
77: extern HTAlertCallback HTPromptUsernameAndPassword;
78: </PRE>
79:
80: <H3>Display a Message</H3>
81:
82: This function simply puts out the message passed.
83:
84: <PRE>
85: extern HTAlertCallback HTAlert;
86: </PRE>
87:
88: <H3>Progress Notification</H3>
89:
90: This function can be used to indicate the current status of a certain
91: action. In order to avoid having strings directly in the core parts of
92: the Library, this function is passed a "state" argument from which the
93: message can be generated in this module. The "param" argument is for
94: additional information to be passed.
95:
96: <PRE>
97: extern HTAlertCallback HTProgress;
98: </PRE>
99:
2.2 frystyk 100: <H3>Generating a User Error Message of a request</H3>
2.1 frystyk 101:
102: This function outputs the content of the error list to standard output
103: (used in Line Mode Browser), but smart clients and servers might
104: overwrite this function so that the error messages can be handled to
105: the user in a nice(r) way. That is the reason for putting the actual
106: implementation in <A HREF="HTAlert.c">HTAlert.c</A>.<P>
107:
108: <PRE>
109: extern HTAlertCallback HTError_print;
2.2 frystyk 110: </PRE>
111:
112: <H3>Generating a Server Error Message of a request</H3>
113:
114: Default function that creates an error message using HTAlert() to
115: put out the contents of the error_stack messages. Furthermore, the
116: error_info structure contains a name of a help file that might be put
117: up as a link. This file can then be multi-linguistic.
118:
119: <PRE>
120: extern BOOL HTError_response (HTRequest * request, HTAlertOpcode op,
2.3 frystyk 121: int msgnum, const char * dfault, void * input,
2.2 frystyk 122: HTAlertPar * reply);
2.1 frystyk 123: </PRE>
124:
125: <PRE>
126: #endif /* HTHOME_H */
127: </PRE>
128:
2.5 ! frystyk 129: <HR>
! 130: <ADDRESS>
! 131: @(#) $Id: Date Author State $
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2.1 frystyk 133: </BODY>
134: </HTML>
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